Forceclose on Inflating XML

Forceclose on Inflating XML - java

In my app I am adding an identical linearlayout to a linearlayout already on the screen. Here is the code where I try to add it:
LinearLayout addItem=(LinearLayout)findViewById(R.id.lladdItem);
insideScroll.addView(addItem);
I get an Error in LogCat which is posted here:
06-24 14:58:16.873 13304-13304/com.frostbytedev.randomgenie E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at android.view.ViewGroup.addView(ViewGroup.java:3148)
at android.view.ViewGroup.addView(ViewGroup.java:3131)
at com.frostbytedev.randomgenie.Test.onClick(Test.java:49)
at android.view.View.performClick(View.java:4204)
at android.view.View$PerformClick.run(View.java:17355)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
And the XML that is inflated:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/lladdItem"
android:paddingLeft="15dp"
android:weightSum="100"
android:layout_width="fill_parent"
android:layout_height="80dp"
android:orientation="horizontal">
<TextView
android:layout_weight="10"
android:layout_width="10dp"
android:layout_height="80dp"
android:text="2."
android:id="#+id/tvItem2"/>
<EditText
android:layout_weight="90"
android:layout_width="100dp"
android:layout_height="80dp"
android:hint="List Item 2"
android:id="#+id/etItem2"
android:paddingTop="50dp"/>
</LinearLayout>
XML where it is inflated to:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="465dp"
android:id="#+id/svItems"
android:layout_gravity="center"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="400dp"
android:orientation="vertical"
android:id="#+id/insideScroll">
<LinearLayout
android:paddingLeft="15dp"
android:weightSum="100"
android:layout_width="fill_parent"
android:layout_height="80dp"
android:orientation="horizontal">
<TextView
android:layout_weight="10"
android:layout_width="10dp"
android:layout_height="80dp"
android:text="1."
android:id="#+id/tvItem1"/>
<EditText
android:layout_weight="90"
android:layout_width="100dp"
android:layout_height="80dp"
android:hint="List Item 1"
android:id="#+id/etItem1"
android:paddingTop="50dp"/>
</LinearLayout>
<LinearLayout
android:paddingLeft="15dp"
android:weightSum="100"
android:layout_width="fill_parent"
android:layout_height="80dp"
android:orientation="horizontal">
<TextView
android:layout_weight="10"
android:layout_width="10dp"
android:layout_height="80dp"
android:text="2."
android:id="#+id/tvItem2"/>
<EditText
android:layout_weight="90"
android:layout_width="100dp"
android:layout_height="80dp"
android:hint="List Item 2"
android:id="#+id/etItem2"
android:paddingTop="50dp"/>
</LinearLayout>
</LinearLayout>
</ScrollView>
<LinearLayout
android:layout_height="50dp"
android:layout_width="fill_parent"
android:orientation="horizontal"
android:weightSum="100">
<Button
android:layout_weight="50"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add"
android:id="#+id/bAdd"/>
<Button
android:layout_weight="50"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Remove"
android:id="#+id/bRemove"
android:layout_gravity="center"/>
</LinearLayout>
</LinearLayout>
Java:
package com.frostbytedev.randomgenie;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.*;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Steven on 6/23/13.
*/
public class Test extends Activity implements View.OnClickListener{
java.util.List<TextView> listOfET = new ArrayList<TextView>();
LinearLayout insideScroll;
ScrollView svItems;
TextView etItem1, etItem2;
Button Add, Remove;
int numOfItems = 2, width, height;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dynamictest);
initialize();
}
private void initialize() {
Add=(Button)findViewById(R.id.bAdd);
Remove=(Button)findViewById(R.id.bRemove);
insideScroll=(LinearLayout)findViewById(R.id.insideScroll);
etItem1=(TextView)findViewById(R.id.etItem1);
etItem2=(TextView)findViewById(R.id.etItem2);
svItems=(ScrollView)findViewById(R.id.svItems);
Add.setOnClickListener(this);
Remove.setOnClickListener(this);
listOfET.add(etItem1);
listOfET.add(etItem2);
}
#Override
public void onClick(View view) {
switch(view.getId()){
case R.id.bAdd:
numOfItems += 1;
LinearLayout addItem=(LinearLayout)findViewById(R.id.lladdItem);
insideScroll.addView(addItem);
break;
case R.id. bRemove:
listOfET.remove(numOfItems);
numOfItems -= 1;
break;
}
}
private int getDP(float i) {
DisplayMetrics metrics = getResources().getDisplayMetrics();
float dp = i;
float fpixels = metrics.density * dp;
int pixels = (int) (fpixels + 0.5f);
return pixels;
}
}

Since your code (Test.java:49) is a couple of calls down the stack from the site of the NPE, it's clear that insideScroll is not null there. That leaves addItem as the likely culprit. And the way I read your XML, the call findViewById(R.id.lladdItem) has to return null, because lladdItem is not defined in the XML file that defines your content view (dynamictest.xml).
What I believe you need to do is to inflate lladditem, rather than looking for it where it doesn't exist:
LayoutInflater inflater = LayoutInflater.from(view.getContext());
LinearLayout addItem =
(LinearLayout) inflater.inflate(R.layout.lladditem, null);
insideScroll.addView(addItem);

Correct me if I am wrong, there is a lot to look through, but it looks like the item you are trying to add is in a different xml file than the one that you inflate with setContentView() and I don't see where you inflate that Layout so you would need to do that or that LinearLayout will be null
Now, that can't create a NPE at insideScroll.addView(addItem); and from what I can see it is initialized properly. I would try cleaning your project in case the editor didn't pick up changes to your xml.
Window --> Project --> Clean...
and choose your project

Related

Android (Java): Programatically adding a custom TableRow View with cells of equal width does not result in cells of equal width

In my Android application, I am attempting to programmatically add a custom TableRow view (CustomTableRow) to a TableLayout. CustomTableRow has cells of equal length (the first two cells have text, and the third one has a edit and delete button, as shown in the diagram below):
However, when I programmatically add a CustomTableRow to my TableLayout, this is the result I get (the cells are all jumbled together instead of occupying equal width):
This seems strange, considering that I have specified that all cells are to have weight 1 in the XML layout that CustomTableRow inflates. Furthermore, I even programatically set the cells in CustomTableRow to have weight 1 as an extra measure. And yet, the cells are still jumbled together.
Below is my code:
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include
android:id="#+id/housemate_data_table"
layout="#layout/table" />
</LinearLayout>
table.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/rent_form"
android:layout_marginTop="0dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:elevation="4dp"
android:padding="8dp"
android:background="#ffffff"
android:orientation="vertical">
<TableLayout
android:id="#+id/table_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="10dp"
android:paddingLeft="5dp"
android:paddingRight="5dp">
<TableRow android:background="#d6d7d7" android:padding="10dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Name"
android:textColor="#000000" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Area"
android:textColor="#000000" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text=""
android:textColor="#000000" />
</TableRow>
</TableLayout>
</LinearLayout>
</LinearLayout>
custom_table_row.xml:
<?xml version="1.0" encoding="utf-8"?>
<TableRow
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="#+id/col1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Name"
android:textColor="#000000" />
<TextView
android:id="#+id/col2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Area"
android:textColor="#000000" />
<LinearLayout
android:id="#+id/col3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1">
<Button
android:minWidth="0dp"
android:minHeight="0dp"
android:layout_width="40dp"
android:layout_height="40dp"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:text="E" />
<Button
android:minWidth="0dp"
android:minHeight="0dp"
android:layout_width="40dp"
android:layout_height="40dp"
android:adjustViewBounds="true"
android:scaleType="centerInside"
android:text="D" />
</LinearLayout>
</TableRow>
MainActivity.java:
package com.example.programaticallyaddtablerowtotablelayout;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TableLayout;
import android.widget.TableRow;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Retrieve of the table layout.
TableLayout table = (TableLayout) findViewById(R.id.table_layout);
// Create the housemate's custom TableRow.
CustomTableRow customTableRow = new CustomTableRow(getApplicationContext(), "Name", "Area");
customTableRow.findViewById(R.id.col1).setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));
customTableRow.findViewById(R.id.col2).setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));
customTableRow.findViewById(R.id.col3).setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT, 1f));
customTableRow.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT));
table.addView(customTableRow, new TableLayout.LayoutParams(TableLayout.LayoutParams.WRAP_CONTENT, TableLayout.LayoutParams.WRAP_CONTENT));
}
}
CustomTableRow.java:
package com.example.programaticallyaddtablerowtotablelayout;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.TableRow;
import androidx.annotation.Nullable;
public class CustomTableRow extends TableRow {
public CustomTableRow(Context context) {
super(context);
initUI();
}
public CustomTableRow(Context context, String name, String areaText) {
super(context);
initUI();
}
public CustomTableRow(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
initUI();
}
// Initiate the custom TableRow's UI by inflating the template XML layout.
private void initUI() {
inflate(getContext(), R.layout.custom_table_row, this);
}
}

In custom_table_row.xml, changing TableRow to the merge tag resolved the problem.

EditText autoscroll doesn't work after showing dialog

I'm developing an app for users to share their books. To achieve this, I'm getting different data about the book from the user. The problem is, horizontal autoscrolling of all EditTexts are working until Dialog has been shown and dismissed. Once a dialog has been dismissed on the fragment, horizontal autoscrolling of the EditText's on this layout won't work.
I added:
android:focusable="true"
android:focusableInTouchMode="true"
to parent layout of the edittext but doesn't work.
Also to make sure that autoscrolling is enabled I've added:
android:scrollHorizontally="true"
But none of above helped.
Here is XML code of the fragment layout.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:orientation="vertical"
android:paddingStart="#dimen/dp25"
android:paddingEnd="#dimen/dp25"
tools:context=".UI.Fragments.SharePostFragments.Fragment1.OverViewFragment">
<LinearLayout
android:id="#+id/root_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical">
<EditText
android:id="#+id/edit_text_name_of_book"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:fontFamily="#font/segoe_ui_semi_bold"
android:hint="#string/name_of_book"
android:inputType="text"
android:maxLength="50"
android:maxLines="1"
android:scrollHorizontally="true"
android:textAlignment="textStart"
android:textColor="#color/colorPrimaryDark"
android:textColorHint="#color/colorPrimaryDark"
android:textSize="#dimen/font22" />
<TextView
android:id="#+id/text_view_number_of_characters"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:layout_marginEnd="#dimen/dp10"
android:fontFamily="#font/segoe_ui_light"
android:text="#string/_0_50"
android:textColor="#color/colorAccent"
android:textSize="#dimen/font16"
tools:ignore="RtlSymmetry" />
<EditText
android:id="#+id/edit_text_name_of_author"
android:layout_width="match_parent"
android:layout_height="#dimen/textBoxHeight"
android:layout_marginTop="#dimen/dp30"
android:background="#drawable/round_text_box_gray"
android:fontFamily="#font/segoe_ui_regular"
android:hint="#string/name_of_writer"
android:inputType="text"
android:paddingStart="20dp"
android:paddingEnd="20dp"
android:textColor="#color/colorPrimaryDark"
android:textColorHint="#color/colorPrimaryDark"
android:textSize="#dimen/font16" />
<RelativeLayout
android:id="#+id/constraint_layout_1"
android:layout_width="match_parent"
android:layout_height="#dimen/textBoxHeight"
android:layout_marginTop="#dimen/dp20"
android:background="#drawable/round_text_box_border_gray"
android:gravity="center_vertical"
android:orientation="horizontal">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_marginTop="3dp"
android:fontFamily="#font/segoe_ui_regular"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:text="#string/price_of_book"
android:textColor="#color/colorPrimaryDark"
android:textSize="#dimen/font16" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:text="#string/azn_sign"
android:textColor="#color/colorPrimaryDark"
android:textSize="#dimen/font16" />
<EditText
android:id="#+id/edit_text_price_of_book"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toStartOf="#+id/textView2"
android:background="#color/white"
android:clickable="false"
android:hint="#string/_0_0"
android:inputType="text|numberDecimal"
android:maxLength="6"
android:singleLine="true"
android:textColorHint="#android:color/black" />
</RelativeLayout>
<LinearLayout
android:id="#+id/constraint_layout_conditions_root"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/dp20"
android:background="#drawable/round_text_box_border_gray"
android:orientation="horizontal">
<LinearLayout
android:id="#+id/linear_layout_1"
android:layout_width="match_parent"
android:layout_height="#dimen/textBoxHeight"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="9"
android:gravity="center_vertical"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:text="#string/book_condition_placeholder"
android:textColor="#color/colorPrimaryDark" />
<ImageButton
android:id="#+id/image_button_conditions"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginEnd="#dimen/dp10"
android:layout_weight="1"
android:background="?attr/selectableItemBackgroundBorderless"
android:src="#drawable/ic_spinner" />
</LinearLayout>
<LinearLayout
android:id="#+id/linear_layout_conditions"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<TextView
android:id="#+id/text_view_new"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/dp20"
android:paddingTop="#dimen/dp10"
android:paddingEnd="#dimen/dp20"
android:paddingBottom="#dimen/dp10"
android:text="#string/_new"
android:textColor="#color/dark_gray_text_color" />
<TextView
android:id="#+id/text_view_normal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/dp20"
android:paddingTop="#dimen/dp10"
android:paddingEnd="#dimen/dp20"
android:paddingBottom="#dimen/dp10"
android:text="#string/normal"
android:textColor="#color/dark_gray_text_color" />
<TextView
android:id="#+id/text_view_old"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/dp20"
android:paddingTop="#dimen/dp10"
android:paddingEnd="#dimen/dp20"
android:paddingBottom="#dimen/dp10"
android:text="#string/old"
android:textColor="#color/dark_gray_text_color" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:id="#+id/constraint_layout_languages_root"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/dp20"
android:background="#drawable/round_text_box_border_gray"
android:orientation="horizontal">
<LinearLayout
android:id="#+id/linear_layout_2"
android:layout_width="match_parent"
android:layout_height="#dimen/textBoxHeight"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="9"
android:gravity="center_vertical"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:text="#string/language"
android:textColor="#color/colorPrimaryDark" />
<ImageButton
android:id="#+id/image_button_languages"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginEnd="#dimen/dp10"
android:layout_weight="1"
android:background="?attr/selectableItemBackgroundBorderless"
android:src="#drawable/ic_spinner" />
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view_languages"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/dp20"
android:paddingEnd="#dimen/dp20"
android:paddingBottom="#dimen/dp10"
android:visibility="gone" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
Fragment Java code:
package org.kitapp.UI.Fragments.SharePostFragments.Fragment1;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.fragment.app.Fragment;
import org.kitapp.R;
import org.kitapp.UI.Dialogs.ConditionDialog.ConditionOfBookDialog;
import org.kitapp.UI.Dialogs.LanguageDialog.LanguageDialog;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import butterknife.OnTextChanged;
public class OverViewFragment extends Fragment implements OverViewContractor.View {
private final String TAG = OverViewFragment.class.getSimpleName();
private Context mContext;
private OverViewCallback mListener;
private OverViewPresenter mPresenter;
#BindView(R.id.constraint_layout_conditions_root)
LinearLayout conditionRoot;
#BindView(R.id.constraint_layout_languages_root)
LinearLayout languagesRoot;
#BindView(R.id.linear_layout_conditions)
LinearLayout conditions;
#BindView(R.id.root_layout)
LinearLayout rootLayout;
#BindView(R.id.text_view_number_of_characters)
TextView numberOfChars;
#BindView(R.id.edit_text_name_of_book)
EditText nameOfBook;
public interface OverViewCallback {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_over_view, container, false);
ButterKnife.bind(this, view);
new OverViewPresenter(this);
//rootLayout.getLayoutTransition().enableTransitionType(LayoutTransition.CHANGING);
return view;
}
////// CONTRACTOR METHODS //////
#Override
public void setPresenter(OverViewPresenter presenter) {
this.mPresenter = presenter;
}
////// LISTENERS //////
#Override
#OnClick(R.id.image_button_conditions)
public void showConds() {
ConditionOfBookDialog conditionOfBookDialog = new ConditionOfBookDialog(mContext);
conditionOfBookDialog.show();
}
#Override
#OnClick(R.id.image_button_languages)
public void showLangs() {
LanguageDialog languageDialog = new LanguageDialog(mContext);
languageDialog.show();
}
#Override
#SuppressLint("SetTextI18n")
#OnTextChanged(R.id.edit_text_name_of_book)
public void onNameOfBookChange() {
int len = nameOfBook.getText().toString().trim().length();
numberOfChars.setText(len + "/50");
if (len > 50) {
nameOfBook.setText(nameOfBook.getText().toString().substring(0, 50));
nameOfBook.setSelection(nameOfBook.getText().length());
}
}
////// FRAGMENT METHODS //////
#Override
public void onAttach(Context context) {
super.onAttach(context);
this.mContext = context;
if (context instanceof OverViewCallback) {
mListener = (OverViewCallback) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OverViewCallback");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
}
UI Design and Dialog
In the image above, there are EditTexts Name Of Book and Name of Author. Before showing a dialog, both of them work like a charm. When writing something, the cursor automatically scrolls to the end. Once Dialog has been shown and dismissed, none of them works properly, and the cursor stays at the end of the EditText but still the characters are being written continues in the hidden part.
In this UI it cannot be seen because of the issue, but I've written.
Roses are red, violets are blue, Stackoverflow I love u
But only Roses are red, violets are blue, Stac can be seen.
Weird buggy layout UI image
Please, help me to solve this problem. Thanks in advance.

As a solution, I don't know the underlying reason, but the problem solved once I removed Butterknife library from my project.

textView setText() Null Pointer Exception [Single Activity Application]

The simple app with just one activity is creating problems with finding the layout's TextView and showing the same as null. Kindly debug the same why the app is crashing on clicking the submit button. I tried many solutions in Stack Overflow and many solutions say that the view might be located outside the activity specified, but here the only one activity is there. So research didn't help me, and now I'm left with the fellow developers who could predict the fault I could have committed.
MainActivity.java
package me.thirumurugan.quiz;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
Button submit;
TextView result;
RadioButton answer_a;
EditText answer_b;
CheckBox answer_c1, answer_c2, answer_c3, answer_c4;
EditText answer_d;
int correct = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
result = (TextView) findViewById(R.id.result);
answer_a = (RadioButton) findViewById(R.id.answer_a);
answer_b = (EditText) findViewById(R.id.answer_b);
answer_c1 = (CheckBox) findViewById(R.id.answer_c1);
answer_c2 = (CheckBox) findViewById(R.id.answer_c2);
answer_c3 = (CheckBox) findViewById(R.id.answer_c3);
answer_c4 = (CheckBox) findViewById(R.id.answer_c4);
answer_d = (EditText) findViewById(R.id.answer_d);
submit = (Button) findViewById(R.id.submit);
submit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
correct = 0;
if (answer_a.isChecked()){
correct++;
}
if (answer_b.getText().toString().equals("2020")){
correct++;
}
if (answer_c1.isChecked()&&answer_c2.isChecked()&&answer_c3.isChecked()&&!answer_c4.isChecked()){
correct++;
}
if (answer_d.getText().toString().toLowerCase().equals("arun jaitley")){
correct++;
}
result.setText("The Score is " + correct + " on 4!");
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
tools:context="me.thirumurugan.quiz.MainActivity">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/welcome_messege"
android:textAlignment="center"
android:id="#+id/result"
android:padding="#dimen/padding"
android:textStyle="bold"
android:textSize="16sp"
android:background="#color/colorAccent"
android:textColor="#FFF"/>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="#dimen/padding"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/padding"
android:text="#string/question_1"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RadioButton
android:id="#+id/answer_a"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/answer_1_a" />
<RadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/answer_1_b" />
</RadioGroup>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/padding"
android:layout_marginTop="#dimen/padding"
android:text="#string/question_2"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<EditText
android:id="#+id/answer_b"
android:hint="#string/answer_hint"
android:textColorHint="#color/colorAccent"
android:layout_width="match_parent"
android:textSize="14sp"
android:layout_height="wrap_content"
android:backgroundTint="#color/colorPrimary"
tools:targetApi="lollipop" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/padding"
android:layout_marginTop="#dimen/padding"
android:text="#string/question_3"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<CheckBox
android:id="#+id/answer_c1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/answer_3_a" />
<CheckBox
android:id="#+id/answer_c2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/answer_3_b" />
<CheckBox
android:id="#+id/answer_c3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/answer_3_c" />
<CheckBox
android:id="#+id/answer_c4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/answer_3_d" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="#dimen/padding"
android:layout_marginTop="#dimen/padding"
android:text="#string/question_4"
android:textColor="#color/colorPrimary"
android:textStyle="bold" />
<EditText
android:id="#+id/answer_d"
android:hint="#string/answer_hint"
android:textSize="14sp"
android:textColorHint="#color/colorAccent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:backgroundTint="#color/colorPrimary"
tools:targetApi="lollipop" />
<Button
android:id="#+id/submit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:backgroundTint="#color/colorPrimary"
android:text="#string/submit"
android:textColor="#FFFFFF"
android:textStyle="bold"
tools:targetApi="lollipop" />
</LinearLayout>
</ScrollView>
</LinearLayout>
The error message was the following in the trace:
08-10 21:58:06.301 20947-20947/me.thirumurugan.quiz E/AndroidRuntime:
FATAL EXCEPTION: main Process: me.thirumurugan.quiz, PID: 20947
java.lang.NullPointerException: Attempt to invoke virtual method 'void
android.widget.TextView.setText(java.lang.CharSequence)' on a null
object reference at
me.thirumurugan.quiz.MainActivity$1.onClick(MainActivity.java:52) at
android.view.View.performClick(View.java:5637) at
android.view.View$PerformClick.run(View.java:22429) at
android.os.Handler.handleCallback(Handler.java:751) at
android.os.Handler.dispatchMessage(Handler.java:95) at
android.os.Looper.loop(Looper.java:154) at
android.app.ActivityThread.main(ActivityThread.java:6119) at
java.lang.reflect.Method.invoke(Native Method) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

You are in need of a clean and rebuild. There is nothing wrong with your code. Multiple users have copied the code and used it to success in their applications, including myself:
Text is missing because I do not have your dimens or strings files.
You do not have a scope issue, as others have suggested. Your member variables should be accessible by any anonymous inner class you create.
There are otherwise missing lines from your shared code. In which case, the community can not resolve your problem as nobody will be capable of replicating it.

Method is missing or has incorrect signature

I am making a simple app in which context view changes and then a toast message is displayed as input given by user. I don't understand why the app keeps on crashing when changing the context view.
Also Android studio gives this warning:
Method "Toaster" is missing in "FirstActivity" or has incorrect signature.
Here is my code:
activity_me_clicked.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/welcome"
android:textSize="36sp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:paddingLeft="7dp"
android:paddingRight="7dp"
android:text="#string/intro"
android:textSize="24sp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:baselineAligned="false">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<EditText
android:id="#+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="7dp"
android:layout_marginEnd="7dp"
android:layout_marginTop="10dp"
android:ems="10"
android:hint="Name"
android:inputType="textPersonName"
tools:ignore="HardcodedText" />
<Button
android:id="#+id/named"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingBottom="10dp"
android:paddingTop="10dp"
android:onClick="MainProcess"
android:text="#string/done" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal"
tools:ignore="UselessLeaf"></LinearLayout>
</LinearLayout>
</LinearLayout>
FirstActivity.Java:
package com.example.nautatvanavlakha.abcd;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class FirstActivity extends AppCompatActivity {
public static String owner_string;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_me_clicked);
}
public void MainProcess(View view) {
final String TAG="DEBUG";
Log.d(TAG,"At least process started");
EditText owner = (EditText) findViewById(R.id.name);
owner_string = owner.getText().toString();
Log.d(TAG,"owner name stored");
TextView textView = (TextView) findViewById(R.id.welcome);
textView.setText("Hi " + owner_string + ".");
Log.d(TAG,"owner name is set");
setContentView(R.layout.activity_main_screen);
Log.d(TAG,"content shown");
}
}
activity_main_screen.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="#+id/welcome"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/textView4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/what_would_you_like_me_to_do_today"
android:textSize="18sp" />
<Button
android:id="#+id/Cam"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:padding="0dp"
android:paddingTop="15dp"
android:text="#string/camera" />
<Button
android:id="#+id/Mus"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:padding="0dp"
android:paddingTop="15dp"
android:text="#string/music" />
<Button
android:id="#+id/QR"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:padding="0dp"
android:paddingTop="15dp"
android:text="#string/scanQR" />
<EditText
android:id="#+id/toastText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/order"
android:inputType="textPersonName" />
<Button
android:id="#+id/toaster"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:onClick="toaster"
android:padding="0dp"
android:paddingTop="15dp"
android:text="#string/toast"
android:layout_marginEnd="100dp"
android:layout_gravity="center"/>
</LinearLayout>
MainScreen.java:
package com.example.nautatvanavlakha.abcd;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainScreen extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_screen);
}
public void toaster(View view){
EditText toast = (EditText)findViewById(R.id.toastText);
String final_toast = toast.getText().toString();
Toast.makeText(getApplicationContext(), final_toast, Toast.LENGTH_SHORT).show();
}
}
EDIT: As suggested, I moved the toaser function to FirstActivity.Java and deleted the MainScreen.java file as it becomes pointless to keep it. But the major problem is when I press the button (id named) the app keeps stopping.
EDIT2: I found that setContentView(R.layout.activity_main_screen) in FirstActivity.Java needs to be above this code
TextView textView = (TextView) findViewById(R.id.welcome);
textView.setText("Hi " + owner_string + ".");
Log.d(TAG,"owner name is set");
so that Activity has access to all the layout components. Thanks solved :)

You replaced the content view in the first activity with a layout that include the onClick attribute, but you have no public void toaster(View view) method there.
So, either don't use setContentView a second time, or implement that method on both Activities.
The recommended way to replace the view is Fragments, by the way

This is a wrong way to change the contents of your Activity, The main problem here is that you have onClick attribute set to "toaster", And you don't have a function called "toaster" in your FirstActivity.
Beside that, The MainScreen Activity in your code will never be used.
So, Your problem is that you set the FirstActivity contents to "activity_main_screen.xml", And FirstActivity doesn't have "toaster" method in it, When you change the context, the Activity will try to find toaster method and the app will crash because the method doesn't exist in FirstActivity.
You can solve this problem by making a method called "toaster" inside FirstActivity, But
This is a very bad practice, You can use Fragments instead, Or you can use Intent to move to another activity.
Some useful links about Fragments:
https://developer.android.com/guide/components/fragments.html
https://www.tutorialspoint.com/android/android_fragments.htm
https://examples.javacodegeeks.com/android/core/app/fragment/android-fragments-example/
Why should I use fragment in Android?

Eclipse: 'ClassCastException' and GUI is not showing in Graphical Layout

I have created a custom component. Here is the code
html_5_spinner.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<EditText
android:id="#+id/spinText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingBottom="5dp"
android:paddingTop="5dp" >
<requestFocus />
</EditText>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<Button
android:id="#+id/upBtn"
android:layout_width="25dp"
android:layout_height="15dp"
android:background="#android:drawable/arrow_up_float" />
<Button
android:id="#+id/downBtn"
android:layout_width="25dp"
android:layout_height="15dp"
android:background="#android:drawable/arrow_down_float" />
</LinearLayout>
</LinearLayout>
HTML5Spinner.java
import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;
public class HTML5Spinner extends LinearLayout {
private EditText spinText;
private Button upBtn, downBtn;
public HTML5Spinner(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
#Override
protected void onFinishInflate()
{
super.onFinishInflate();
((Activity)getContext()).getLayoutInflater().inflate(R.layout.html5_spinner, this);
setupViewItems();
}
private void setupViewItems()
{
spinText = (EditText)findViewById(R.id.spinText);
upBtn = (Button)findViewById(R.id.upBtn);
downBtn = (Button)findViewById(R.id.downBtn);
//Register Listeners
upBtn.setOnClickListener(new UpButtonAction());
}
private class UpButtonAction implements OnClickListener
{
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.d("workn", "It is running");
}
}
}
Main activity is using the above cusom component. It just has a XML, no business logic or GUI rendering Java code
activity_main.xml
<ScrollView
android:id="#+id/scroller"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:stretchColumns="*" >
<TableRow
android:id="#+id/tableRow1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<RadioButton
android:id="#+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:drawablePadding="5dp"
android:text="RadioButton" />
<com.nFlate.nflate.HTML5Spinner
android:id="#+id/aasaas"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
></com.nFlate.nflate.HTML5Spinner>
</TableRow>
<TableRow
android:id="#+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="#+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:drawablePadding="5dp"
android:text="RadioButton" />
<com.nFlate.nflate.HTML5Spinner
android:id="#+id/aasaas"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
></com.nFlate.nflate.HTML5Spinner>
</TableRow>
<TableRow
android:id="#+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</TableRow>
<TableRow
android:id="#+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</TableRow>
</TableLayout>
</ScrollView>
</RelativeLayout>
This gives no error when running. But eclipse shows errors in "Graphical Layout" of activity_main.xml
Below is the error
Exception raised during rendering: com.android.layoutlib.bridge.android.BridgeContext cannot be cast to android.app.Activity
Exception details are logged in Window > Show View > Error Log
java.lang.ClassCastException: com.android.layoutlib.bridge.android.BridgeContext cannot be cast to android.app.Activity
at com.xxx.xxx.HTML5Spinner.onFinishInflate(HTML5Spinner.java:27)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:754)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:718)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:749)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:718)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:749)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:718)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:749)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:718)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:749)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:718)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:372)
Below is the place where this error is displayed.
Because of this error, the GUI is not getting displayed in eclipse Graphical Layout. Why is this?

In your onFinishInflate there's this problematic cast:
((Activity)getContext())
Eclipse Graphical Layout renders views with a Context that is not an Activity. You shouldn't need this cast here anyway.

You are missing the library which renders the spinner. Include that library in your project. Please import library into the workspace in order to work properly and mark this library in the android option of the project properties. The main problem for this is not including the library properly.

if in your manifest file the HTML5Spinner.java registered as a activity then it must extends Activity type things to proceed but here the LinearLayout used so thins would not start..so that the xml GUI aslo giving error for ClassCastException..

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Forceclose on Inflating XML - java

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Eclipse: 'ClassCastException' and GUI is not showing in Graphical Layout

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