Develop Reference

Truecaller like alert dialog in dart

I am trying to implement a true caller like alert dialog in flutter. Since I am very new to flutter+dart, I was looking for any out of the box implementation. So far I have found system_alert_window but this creates the alert dialogue in JAVA and uses platform channels to communicate with it. My question is that if it's possible to do this is pure flutter+dart.
I do not know if this kind of dialogues has any special names, also in truecaller the dialogue is shown regardless the app is running or not. Can anyone provide some pointers?
Thanks

No you can't do with flutter
You can only go with Java.
Flollow the steps
your project > android > app > src > main > AndroidManifest.xml
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
add this permission on your Androidmanifest.xml file
after adding the permission add the below receiver class
<receiver android:name=".CallReceiver"
android:enabled="true"
android:permission="android.permission.BIND_JOB_SERVICE"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
the receiver class
ServiceReceiver.Java
public class ServiceReceiver extends BroadcastReceiver {
#Override
public void onReceive(final Context context, Intent intent) {
TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
telephony.listen(new PhoneStateListener(){
#Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
System.out.println("incomingNumber : "+incomingNumber);
WindowManager windowManager = (WindowManager) context.getSystemService(WINDOW_SERVICE);
View view = LayoutInflater.from(context).inflate(R.layout.popup_window, null); // Code for inflating xml layout
int LAYOUT_FLAG;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
} else {
LAYOUT_FLAG = WindowManager.LayoutParams.TYPE_PHONE;
}
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
LAYOUT_FLAG,
WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
PixelFormat.TRANSLUCENT);
windowManager.addView(view, params);
}
},PhoneStateListener.LISTEN_CALL_STATE);
}
}
add the below xml file on the folder
your project > android > app > src > main > res > layout > popup_window.xml
popup_window.xml
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:layout_marginRight="10dp"
android:layout_marginBottom="5dp"
android:background="#000000"
card_view:cardCornerRadius="4dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/popup_color"
android:orientation="vertical"
tools:ignore="UselessParent">
<LinearLayout
android:id="#+id/ll1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal"
android:padding="5dp">
<ImageView
android:id="#+id/paymentlogo"
android:layout_width="65dp"
android:layout_height="65dp"
android:scaleType="fitCenter"
android:src="#drawable/rsoft_logo"
app:srcCompat="#drawable/rsoft_logo" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical"
android:padding="3dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:orientation="horizontal">
<TextView
android:id="#+id/lbl_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_marginLeft="6dp"
android:layout_weight="0.3"
android:singleLine="true"
android:text="Anand"
android:textColor="#000000"
android:textSize="20sp" />
<ImageView
android:id="#+id/iv_close"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1.7"
android:src="#drawable/ic_close_black" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
<TextView
android:id="#+id/txt_record_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TextView"
android:visibility="gone"
tools:ignore="HardcodedText" />
<View
android:id="#+id/btw_view"
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_gravity="center"
android:background="#bab9b9" />
<LinearLayout
android:id="#+id/details_adp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal"
android:padding="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical"
android:padding="3dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal"
android:padding="3dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/tv_icon"
android:layout_width="17dp"
android:layout_marginTop="4dp"
android:layout_height="17dp"
android:layout_weight="1"
android:textColor="#000000"
android:src="#android:drawable/sym_call_incoming"
android:textSize="10sp" />
<TextView
android:id="#+id/tv_mobile"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="4dp"
android:layout_weight="1"
android:text="7667673691"
android:padding="0dp"
android:textColor="#000000"
android:textSize="16sp" />
</LinearLayout>
<TextView
android:id="#+id/tv_mobile_"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="4dp"
android:layout_marginTop="4dp"
android:text="Incomingg"
android:textColor="#000000"
android:textSize="12sp" />
<!-- <LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="horizontal"
android:layout_marginTop="4dp"
android:padding="3dp">
<ImageView
android:id="#+id/iv_im"
android:layout_width="14dp"
android:layout_height="14dp"
android:src="#drawable/sim" />
<TextView
android:id="#+id/tv_sim"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="4dp"
android:text="Incomingg"
android:textColor="#000000"
android:textSize="12sp" />
</LinearLayout>-->
</LinearLayout>
<TextView
android:id="#+id/tv_lead"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="4dp"
android:text="Save As Lead"
android:background="#drawable/rounded_btn"
android:padding="8dp"
android:layout_marginTop="6dp"
android:textColor="#000000"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>

You can use flutter_overlay_window. Its JAVA only but works fine. The example app has a truecaller like overlay demo. The other answer is correct, no it can't be done in pure flutter.

Android Studio Code in Java to take user input and display output

Here I am trying to take user input and display output in a Text View, but checkgen and checkuser is returning -1 despite of selecting them and also both the radio buttons are getting selected not any one of them, I want to display all the details entered in the text view. I have pasted the activity_reg.xml code below too
reg.java
package com.example.bloodbank;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
public class reg extends AppCompatActivity {
//login button
Button btn_login;
//firstname
EditText fn;
//lastname
EditText ln;
//phone number
EditText pn;
//output
TextView op;
//registration button
Button btn_reg;
//radio group for gender
RadioGroup rggen;
//radio group for user(donor/in search of blood)
RadioGroup rguser;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reg);
btn_login=findViewById(R.id.btn_login);
fn=findViewById(R.id.txtfirstname);
ln=findViewById(R.id.txtlastname);
pn=findViewById(R.id.txtmobile);
op=findViewById(R.id.outputreg);
rggen=findViewById(R.id.rggender);
rguser=findViewById(R.id.rgreg);
btn_reg=findViewById(R.id.main_btn_reg);
btn_reg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String fname=fn.getText().toString();
String lname=ln.getText().toString();
int pno= new Integer(pn.getText().toString());
int checkgen=rggen.getCheckedRadioButtonId();
//Toast.makeText(reg.this, "checkgen= "+checkgen, Toast.LENGTH_SHORT).show();
int checkuser=rguser.getCheckedRadioButtonId();
//Toast.makeText(reg.this, "checkuser= "+checkuser, Toast.LENGTH_SHORT).show();
if(((checkgen == -1)||(checkuser == -1))||((checkgen == -1)&&(checkuser == -1)))
{
//no radio button selected
Toast.makeText(reg.this, "Please select an option", Toast.LENGTH_SHORT).show();
}
else {
//radio button is checked
findRadioButton1(checkgen);
findRadioButton2(checkuser);
op.setText("Welcome " + fname + " " + lname + "Phone Number: " +pno );
}
}
});
btn_login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent(reg.this,login.class);
startActivity(i);
}
});
}
private void findRadioButton2(int checkuser) {
switch(checkuser){
case R.id.rbdonor:
op.setText("\nUser: Donor\n");
break;
case R.id.rbneedy:
op.setText("\nUser: In search of blood\n");
break;
}
}
private void findRadioButton1(int checkgen) {
switch(checkgen){
case R.id.rbmale:
op.setText("\nGender: Male\n");
break;
case R.id.rbfemale:
op.setText("\nGender: Female\n");
break;
}
}
}
activity_reg.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="#+id/rbmale"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".reg">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:elevation="23dp"
android:gravity="center"
android:orientation="vertical">
<TextView
android:id="#+id/txtregister"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Registration"
android:textColor="#color/colorPrimaryDark"
android:textSize="20dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="10"
>
<EditText
android:id="#+id/txtfirstname"
android:layout_width="match_parent"
android:layout_height="50dp"
android:hint="First Name*"
android:paddingLeft="8dp"
android:paddingTop="15dp"
android:singleLine="true"
android:textColor="#color/colorPrimaryDark"
android:textColorHint="#color/colorPrimaryDark"
android:textSize="13dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="10"
>
<EditText
android:id="#+id/txtlastname"
android:layout_width="match_parent"
android:layout_height="50dp"
android:hint="Last Name*"
android:paddingLeft="8dp"
android:paddingTop="15dp"
android:singleLine="true"
android:textColor="#color/colorPrimaryDark"
android:textColorHint="#color/colorPrimaryDark"
android:textSize="13dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="3"
>
<TextView
android:id="#+id/textView"
android:layout_width="90dp"
android:layout_height="30dp"
android:layout_weight="1"
android:text=" Gender*:"
android:textColor="#A31D13" />
<RadioGroup
android:id="#+id/rggender"
android:layout_width="309dp"
android:layout_height="match_parent"
android:layout_weight="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<RadioButton
android:id="#+id/rbmale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Male"
android:textColor="#BE202F" />
<RadioButton
android:id="#+id/rbfemale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Female"
android:textColor="#BE202F" />
</LinearLayout>
</RadioGroup>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="10"
>
<EditText
android:id="#+id/txtmobile"
android:layout_width="match_parent"
android:layout_height="50dp"
android:hint="Mobile Number*"
android:inputType="number"
android:maxLength="10"
android:paddingLeft="8dp"
android:paddingTop="15dp"
android:singleLine="true"
android:textColor="#color/colorPrimaryDark"
android:textColorHint="#color/colorPrimaryDark"
android:textSize="13dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="10"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal">
<EditText
android:id="#+id/txtpassword"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight="1"
android:hint="Password*"
android:inputType="textPassword"
android:maxLength="10"
android:paddingLeft="8dp"
android:paddingTop="15dp"
android:singleLine="true"
android:textColor="#color/colorPrimaryDark"
android:textColorHint="#color/colorPrimaryDark"
android:textSize="13dp" />
</LinearLayout>
<TextView
android:id="#+id/textView2"
android:layout_width="111dp"
android:layout_height="30dp"
android:layout_marginTop="10dp"
android:text=" Register as*:"
android:textColor="#BE202F" />
<RadioGroup
android:id="#+id/rgreg"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RadioButton
android:id="#+id/rbdonor"
android:layout_width="171dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="I am a donor"
android:textColor="#BE202F" />
<RadioButton
android:id="#+id/rbneedy"
android:layout_width="183dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="I am in search of blood"
android:textColor="#BE202F" />
</LinearLayout>
</RadioGroup>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginBottom="1dp"
android:orientation="horizontal">
</LinearLayout>
<Button
android:id="#+id/main_btn_reg"
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_marginTop="20dp"
android:background="#color/colorPrimaryDark"
android:text="REGISTER"
android:textColor="#color/white"
android:textSize="14dp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical">
<View
android:layout_width="match_parent"
android:layout_height="0.6dp"
android:layout_marginTop="16dp"
android:background="#color/colorPrimaryDark"></View>
<Button
android:id="#+id/btn_login"
android:layout_width="86dp"
android:layout_height="44dp"
android:layout_marginTop="7dp"
android:gravity="center"
android:text="LOGIN"
android:textColor="#color/colorPrimaryDark"
android:textSize="14dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="10dp"
android:orientation="vertical"></LinearLayout>
</LinearLayout>
<TextView
android:id="#+id/outputreg"
android:layout_width="match_parent"
android:layout_height="60dp" />
</LinearLayout>
</ScrollView>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout> ```

Cardview Click is not opening Activty

My problems :
no error in this project, i can run successful.
my button can click at a certain time.
when i click it back, it doesn't work at all.
i think my problem is near the parent.
What's my mistake in my project's parent?
Help me please.
Below is my Java file : Dashboard.java
package com.example.whatisthat;
import androidx.cardview.widget.CardView;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class Dashboard extends Activity implements View.OnClickListener
{
private CardView LoginBtn, CaptureBtn, AboutBtn, FeedbackBtn, IgBtn, HelpBtn;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
//DEFINE CARDS
//ADD CLICK LISTENER TO THE CARDS
LoginBtn = findViewById(R.id.Login);
LoginBtn.setOnClickListener(this);
CaptureBtn = findViewById(R.id.Capture);
CaptureBtn.setOnClickListener(this);
AboutBtn = findViewById(R.id.About);
AboutBtn.setOnClickListener(this);
FeedbackBtn = findViewById(R.id.Feedback);
FeedbackBtn.setOnClickListener(this);
IgBtn = findViewById(R.id.Ig);
IgBtn.setOnClickListener(this);
HelpBtn = findViewById(R.id.Help);
HelpBtn.setOnClickListener(this);
}
#Override
public void onClick(View view)
{
Intent i;
switch (view.getId())
{
case R.id.Login : i = new Intent(this,Login1.class);
startActivity(i);
break;
case R.id.Capture : i = new Intent(this, Capture.class);
startActivity(i);
break;
case R.id.About : i = new Intent(this, About.class);
startActivity(i);
break;
case R.id.Feedback : i = new Intent(this, Feedback.class);
startActivity(i);
break;
case R.id.Ig : i = new Intent(this, Instagram.class);
startActivity(i);
break;
case R.id.Help : i = new Intent(this, Help.class);
startActivity(i);
break;
default:break;
}
}
}
Below is my .xml file : activity_dashboard.xml
<?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"
tools:context=".Dashboard">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="230dp"
android:orientation="vertical"
android:gravity="center"
android:background="#6A287E">
<ImageView
android:layout_width="90dp"
android:layout_height="90dp"
android:src="#drawable/iconfyp"
android:layout_gravity="center"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DASHBOARD"
android:textColor="#color/colorAccent"
android:layout_gravity="center"
android:textStyle="bold"
android:textSize="18sp"
android:layout_marginTop="10dp"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginTop="215dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="135dp"
android:orientation="horizontal"
android:layout_marginBottom="10dp">
<androidx.cardview.widget.CardView
android:foreground="? android:attr/selectableItemBackground"
android:focusable="true"
android:clickable="true"
android:id="#+id/Login"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:layout_marginRight="5dp"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="50dp"
android:id="#+id/imageView1"
android:layout_height="50dp"
android:src="#drawable/people"
android:layout_centerInParent="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LOGIN"
android:textSize="16sp"
android:layout_below="#+id/imageView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/buttonLogin"
android:background="#android:color/transparent"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:foreground="? android:attr/selectableItemBackground"
android:focusable="true"
android:clickable="true"
android:id="#+id/Capture"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:layout_marginLeft="5dp"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="50dp"
android:id="#+id/imageView2"
android:layout_height="50dp"
android:src="#drawable/cameraa"
android:layout_centerInParent="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CAPTURE"
android:textSize="16sp"
android:layout_below="#+id/imageView2"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/buttonCapture"
android:background="#android:color/transparent"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="135dp"
android:orientation="horizontal"
android:layout_marginBottom="10dp">
<androidx.cardview.widget.CardView
android:foreground="? android:attr/selectableItemBackground"
android:focusable="true"
android:clickable="true"
android:id="#+id/About"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:layout_marginRight="5dp"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="50dp"
android:id="#+id/imageView3"
android:layout_height="50dp"
android:src="#drawable/aboutt"
android:layout_centerInParent="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ABOUT"
android:textSize="16sp"
android:layout_below="#+id/imageView3"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/buttonAbout"
android:background="#android:color/transparent"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:foreground="? android:attr/selectableItemBackground"
android:focusable="true"
android:clickable="true"
android:id="#+id/Feedback"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:layout_marginLeft="5dp"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="50dp"
android:id="#+id/imageView4"
android:layout_height="50dp"
android:src="#drawable/feedback"
android:layout_centerInParent="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="FEEDBACK "
android:textSize="16sp"
android:layout_below="#+id/imageView4"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/buttonFeedback"
android:background="#android:color/transparent"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="135dp"
android:orientation="horizontal"
android:layout_marginBottom="10dp">
<androidx.cardview.widget.CardView
android:foreground="? android:attr/selectableItemBackground"
android:focusable="true"
android:clickable="true"
android:id="#+id/Ig"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:layout_marginRight="5dp"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="50dp"
android:id="#+id/imageView5"
android:layout_height="50dp"
android:src="#drawable/instagram"
android:layout_centerInParent="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="INSTAGRAM"
android:textSize="16sp"
android:layout_below="#+id/imageView5"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/buttonIg"
android:background="#android:color/transparent"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:foreground="? android:attr/selectableItemBackground"
android:focusable="true"
android:clickable="true"
android:id="#+id/Help"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:layout_marginLeft="5dp"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="50dp"
android:id="#+id/imageView6"
android:layout_height="50dp"
android:src="#drawable/help"
android:layout_centerInParent="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="HELP"
android:textSize="16sp"
android:layout_below="#+id/imageView6"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/buttonHelp"
android:background="#android:color/transparent"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
</ScrollView>
</RelativeLayout>

Well You have to First Remove space from this android:foreground="?android:attr/selectableItemBackground" and add this to all the button
android:clickable="false"
If you want to Open Activity With Button Then you have to put setOnClickListener to Button .Else if you want to open Activity with Cardview you have to put setOnClickListener to cardview.
Use this for OnClick Method:
#Override
public void onClick(View view) {
if (view==LoginBtn){
startActivity(new Intent(this,Login1.class));
}else if(view==Capture){
startActivity(new Intent(this,Capture.class));
}
//Do rest by yourself.
}

Stopwatch buttons crash in Android Studio

Happy day to all of you.
I have been attempting to make a stopwatch application as my first one, while using the Chronometer function. The problem is, when I click on the Start button (while the app is running on tablet), it crashes. The situation is similar to the others.
I am not sure how I should fix this, and I greatly appreciate your help.
activity_main.xml :
<?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"
tools:context=".MainActivity">
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true">
<ImageView
android:id="#+id/body"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:srcCompat="#color/colorPrimaryDark" />
<LinearLayout
android:id="#+id/navcon"
android:layout_width="match_parent"
android:layout_height="92dp"
android:orientation="vertical">
<ImageView
android:id="#+id/navbar"
android:layout_width="match_parent"
android:layout_height="80dp"
android:background="#color/colorPrimary" />
</LinearLayout>
<LinearLayout
android:id="#+id/navtextcon"
android:layout_width="match_parent"
android:layout_height="80dp"
android:orientation="vertical">
<TextView
android:id="#+id/navtext"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:text="rocket.studios"
android:textColor="#android:color/white"
android:textSize="24sp"
android:textStyle="bold" />
</LinearLayout>
</FrameLayout>
<LinearLayout
android:id="#+id/chronocon"
android:layout_width="match_parent"
android:layout_height="95dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="78dp"
android:orientation="vertical">
<Chronometer
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:textColor="#android:color/white"
android:textSize="60sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/startbcon"
android:layout_width="match_parent"
android:layout_height="118dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="155dp"
android:orientation="vertical"
android:padding="20dp">
<Button
android:id="#+id/startb"
android:layout_width="match_parent"
android:layout_height="68dp"
android:background="#color/colorPrimary"
android:text="#string/start"
android:textColor="#android:color/white"
android:textSize="24sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/stopbcon"
android:layout_width="match_parent"
android:layout_height="118dp"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:orientation="vertical"
android:padding="20dp">
<Button
android:id="#+id/stopb"
android:layout_width="match_parent"
android:layout_height="68dp"
android:background="#color/colorPrimary"
android:text="#string/stop"
android:textColor="#android:color/white"
android:textSize="24sp"
android:textStyle="bold" />
</LinearLayout>
<LinearLayout
android:id="#+id/resetbcon"
android:layout_width="match_parent"
android:layout_height="118dp"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="158dp"
android:orientation="vertical"
android:padding="20dp">
<Button
android:id="#+id/resetb"
android:layout_width="match_parent"
android:layout_height="68dp"
android:background="#color/colorPrimary"
android:text="#string/reset"
android:textColor="#android:color/white"
android:textSize="24sp"
android:textStyle="bold" />
</LinearLayout>
MainActivity.java :
package testing.ezekieralt.com.stopwatcher;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.ButtonBarLayout;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;
import android.os.SystemClock;
//chronometer is...guess it
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Chronometer chronometer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.startb).setOnClickListener(this);
findViewById(R.id.resetb).setOnClickListener(this);
findViewById(R.id.stopb).setOnClickListener(this);
chronometer = findViewById(R.id.chronometer);
}
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.stopb:
chronometer.stop();
break;
case R.id.startb:
chronometer.setBase(SystemClock.elapsedRealtime());
chronometer.start();
break;
case R.id.resetb:
chronometer.setBase(SystemClock.elapsedRealtime());
break;
}
}
}
AndroidManifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="testing.ezekieralt.com.stopwatcher">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

You didn't added id to your Chronometer. Add id to your Chronometer
<Chronometer
android:id="#+id/chronometer"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:textColor="#android:color/white"
android:textSize="60sp"
android:textStyle="bold" />

Not displaying OK button in cardview in pop up dialog [duplicate]

This question already has answers here:
Add positive button to Dialog
(3 answers)
Closed 5 years ago.
I am new in android app development. I am making a project in android-studio.I want to show pop up dialog whatever I have declared in xml file but OK button is not showing. If anyone knows about it, please share your answer.xml and java codes are below
image_layout.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="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
<!--<ImageView android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content" android:src="YOUR IMAGE"/>-->
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardViewbluetooth"
app:cardCornerRadius="5dp"
android:layout_gravity="center"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:paddingTop="180dp"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Bluetooth not enabled"
android:textSize="20dp"
android:textStyle="bold"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Please enable bluetooth in settings and restart this application"
android:textStyle="bold"/>
<Button android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="OK" android:onClick="dismissListener"/>
</LinearLayout>
</android.support.v7.widget.CardView></LinearLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
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:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context="litifer.awesome.game.litifer_carddemo.MainActivity"
>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView1"
app:cardCornerRadius="5dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
app:cardElevation="0dp"
android:clickable="true"
app:cardBackgroundColor="#android:color/transparent"
android:background="#33FF0000"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imageBeacon"
android:src="#drawable/beacon"
android:adjustViewBounds="true"
android:layout_gravity="center"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView1text"
android:text="Beacon Demo"
android:layout_marginLeft="20dp"
android:layout_marginTop="10dp"
android:textSize="20dp"
android:textStyle="bold"
android:layout_marginRight="20dp"
android:layout_marginBottom="10dp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView2"
app:cardCornerRadius="5dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
app:cardElevation="0dp"
android:clickable="true"
app:cardBackgroundColor="#android:color/transparent"
android:background="#33FF0000"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imageWifi"
android:src="#drawable/wifi"
android:adjustViewBounds="true"
android:layout_gravity="center"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView2text"
android:text="Wifi Demo"
android:layout_marginLeft="20dp"
android:layout_marginTop="10dp"
android:textSize="20dp"
android:textStyle="bold"
android:layout_marginRight="20dp"
android:layout_marginBottom="10dp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView3"
app:cardCornerRadius="5dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
app:cardElevation="0dp"
android:clickable="true"
app:cardBackgroundColor="#android:color/transparent"
android:background="#33FF0000"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imageCustomerReview"
android:src="#drawable/customerreview"
android:adjustViewBounds="true"
android:layout_gravity="center"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView3text"
android:text="CustomerReview Demo"
android:layout_marginLeft="20dp"
android:layout_marginTop="10dp"
android:textSize="20dp"
android:textStyle="bold"
android:layout_marginRight="20dp"
android:layout_marginBottom="10dp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView4"
app:cardCornerRadius="5dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
app:cardElevation="0dp"
android:clickable="true"
app:cardBackgroundColor="#android:color/transparent"
android:background="#33FF0000"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imagecardview"
android:src="#drawable/cardview"
android:adjustViewBounds="true"
android:layout_gravity="center"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView4text"
android:text="CardView Demo"
android:layout_marginLeft="20dp"
android:layout_marginTop="10dp"
android:textSize="20dp"
android:textStyle="bold"
android:layout_marginRight="20dp"
android:layout_marginBottom="10dp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView5"
app:cardCornerRadius="5dp"
android:layout_gravity="center"
android:layout_marginTop="10dp"
app:cardElevation="0dp"
android:clickable="true"
app:cardBackgroundColor="#android:color/transparent"
android:background="#33FF0000"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/imagedemo"
android:src="#drawable/demo"
android:adjustViewBounds="true"
android:layout_gravity="center"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cardView5text"
android:text="Test All Demo"
android:layout_marginLeft="20dp"
android:layout_marginTop="10dp"
android:textSize="20dp"
android:textStyle="bold"
android:layout_marginRight="20dp"
android:layout_marginBottom="10dp"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout> </ScrollView>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private ImageView beacon,cardview,customerreview,demo,wifi;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
beacon = (ImageView)findViewById(R.id.imageBeacon);
beacon.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
// Device does not support Bluetooth
} else {
if (!mBluetoothAdapter.isEnabled()) {
// Bluetooth is not enable :)
Dialog settingsDialog = new Dialog(MainActivity.this);
settingsDialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
settingsDialog.setContentView(getLayoutInflater().inflate(R.layout.image_layout
, null));
settingsDialog.show();
}
}
}
});
}
}

try this
Dialog settingsDialog = new Dialog(this);
settingsDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
settingsDialog.setContentView(R.layout.image_layout);
settingsDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
settingsDialog.setCancelable(true);
settingsDialog.setTitle("Title...");
settingsDialog.show();