I am implementing a simple page similar to any other app, a 'header image' and content below.
I've placed a wedhead.png file manually into all the drawable folders that I want to display.
The layout I wish to implement displays correctly on the graphical editor, but not on the emulator. The emulator comes out blank. Emulator is ARM CPU based.
Emulator screen -
Here's my code
XML File:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.wwmk1.MainActivity" >
<ImageView
android:id="#+id/img1"
android:layout_width="match_parent"
android:layout_height="160dp"
android:layout_marginBottom="19dp"
android:contentDescription="header"
android:fadingEdge="vertical"
android:src="#drawable/wedhead"
android:visibility="visible" />
</RelativeLayout>
The Main activity java file
package com.example.wwmk1;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView iv = (ImageView)findViewById(R.id.img1);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
What place did I go wrong?
Please help. Thanks
Related
Today I'm first starting Android Development, so I installed the Android studio, and booted it up starting a Blank Activity template. When I opened up the .xml file to look at what the screen would look like I got this error
Rendering Issue:
The following classes could not be instantiated: - android.support.design.widget.FloatingActionButton (Open Class, Show Exception, Clear Cache)
Tip: Use View.isInEditMode() in your custom views to skip code or show sample data when shown in the IDE
This is my content_main.xml file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="whs_it_cup_team.uitest.MainActivity"
tools:showIn="#layout/activity_main">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</RelativeLayout>
And this is my mainActivity.java file:
package whs_it_cup_team.uitest;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Also note I have not changed any line of code and I have the Android 6.0 sdk API:23 installed and I'm targeting API:21
I am developing an app in android which requires a list activity to show all pdfs from sdcard..i found the below code and used it but it is not working my app is unfortunately closing.. can anyone tell me whats the error.
MainActivity.java
package com.example.vinita.listallpdfs;
import android.app.ListActivity;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Arrays;
import static com.example.vinita.listallpdfs.R.layout.activity_main;
public class MainActivity extends ListActivity {
ArrayAdapter adapter;
int clickCounter=0;
ArrayList listItems=new ArrayList();
private File[] imagelist;
String[] pdflist;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(activity_main);
File images = Environment.getExternalStorageDirectory();
//ListView list=(ListView)findViewById(R.id.list);
imagelist = images.listFiles(new FilenameFilter() {
#Override
public boolean accept(File dir, String name) {
return ((name.endsWith(".pdf")));
}
});
pdflist = new String[imagelist.length];
for (int i = 0; i < imagelist.length; i++) {
pdflist[i] = imagelist[i].getName();
}
Arrays.sort(imagelist);
Arrays.sort(pdflist);
this.setListAdapter(new ArrayAdapter(this, android.R.layout.simple_list_item_1, pdflist));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity"
android:background="#ff3db0ff"
android:orientation="vertical">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#android:id/list"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:scrollbars="vertical"/>
</RelativeLayout>
Add this permission to your manifest file
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
hope it helps :D
XML layout file
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.gaurav.googlemap.HomeMap" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
<fragment android:name="com.google.android.gms.maps.MapFragment"
android:id="#+id/map"
android:layout_height="match_parent"
android:layout_width="match_parent">
</fragment>
</RelativeLayout>
Java file
package com.beproject.ourway;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
public class HomeMap extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_map);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.home_map, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
As I searched this question before also, I have done following things to solve
1.Imported following classes
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
2.Extended FragmentActivity class
Still I am getting this error in logcat
Error inflating class fragment
Is there any other way to solve this? Thanks.
Given that you have used 'support fragment' you need to replace MapFragment with SupportMapFragment. Doing this should fix it.
Use:
class="com.google.android.gms.maps.SupportMapFragment"
instead of :
android:name="com.google.android.gms.maps.MapFragment"
so your xml must be like:
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment"/>
I am writing a simple app that displays a fragment in the main activity. When I run the app, it displays two instances of the fragment on the screen. I have included the code below. By the way, when I remove FT.commit(); from the main activity class, only one fragment instance is displayed on the screen as it should. What is the problem here?
thanks.
Fragment layout XML file
<?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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="#+id/textView"
android:layout_gravity="center_horizontal" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/button"
android:layout_gravity="center_horizontal" />
</LinearLayout>
Fragment Class
package com.example.fragment;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class fragmentone extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragoner, container, false);
}
}
Main activity layout XML file:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity">
<fragment
android:name="com.example.fragment.fragmentone"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fragone"
tools:layout="#layout/fragoner">
</fragment>
</RelativeLayout>
Main Activity Class
package com.example.fragment;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager manager = getFragmentManager();
FragmentTransaction FT = manager.beginTransaction();
fragmentone Fone = new fragmentone();
FT.add(R.id.fragone,Fone);
FT.commit();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
What is the problem here?
If you use the <fragment> tag, do not also use a FragmentTransaction to add the same fragment. Those are two separate techniques and should not be mixed.
Simply get rid of every line from onCreate() except the call to super.onCreate() and the setContentView() call, and stick with your static <fragment>.
Either remove the from your activity's layout view or stop using commit. You can use a as a container for your fragment. Add an id to your FrameLayout than use:
FragmentManger manager=getFragmentManager();
Fragment fragment=manager.findFragmentById(R.id.frameContainer);
Not too sure why im getting the following errors.
I just cant create a simple hello world app no matter what i do, nothing will compile been trying for hours.
Ive posted all the code i have as well.
MainActivity.java:
package com.rikin.myfirstapplication;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.rikin.myfirstapplication.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
probably you have a conflict with the support libraries.
if your project has defined the support library appcompat_v7
then delete the android-supportv4.jar library inside your libs folder.
Other cause will be the build target, set your build target to 20, delete the errors and try again.