How to dismiss a custom dialog based on touch points?

How to dismiss a custom dialog based on touch points?

Hint: Use Region 


When we write a custom dialog class or set theme style/Theme.Dialog to activity, we might be interested in dismissing the dialog if user touches outside the dialog visible area. 

This can be achieved through a special class, android.graphics.Region. It has a api contains(x,y) which is used to tell you if the passed x,y falls in the region defined.

1 - we need to override the public boolean onTouchEvent (MotionEvent event) function and get the current x,y the user touched on the screen. 

2 - Define the region top left x,y and bottom right x,y of the rectangle region which you are interested in listening the touch events.

      Region dialogRegion = new Region (10,12,183,179 );

3 - Dismiss the dialog using finish() if the touch points falls within this region() co-ordinates.

          if( dialogRegion.contains(x, y) == true)
               this.finish();

Here is the complete example.

This example shows that activity is set style - Theme.Dialog.

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<activity android:name=".touch"
          android:label="@string/app_name"
          android:theme="@android:style/Theme.Dialog">


Size of the dialog is set using WindowManager layout params. 

Depending on the height & width, i have set the region points.And in onTouchEvent() i check for the touch points, if within the region() points i simply call finish() which exits the activity. 

touch.java
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package com.android.touch;  
  
import android.app.Activity;  
import android.graphics.Region;  
import android.os.Bundle;  
import android.view.MotionEvent;  
import android.view.WindowManager;  
  
public class touch extends Activity {  
 Region dialogRegion;  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        WindowManager.LayoutParams params = getWindow().getAttributes();  
          
        params.height = 200;  
        params.width = 200;  
          
  
        this.getWindow().setAttributes(params);  
          
        dialogRegion = new Region (10,12,183,179 );  
         
    }  
    public boolean onTouchEvent (MotionEvent event)  
    {  
       
     final int action = event.getAction();  
    
  
   final int x = (int) event.getX();  
        final int y = (int) event.getY();  
  
      switch (action & MotionEvent.ACTION_MASK)   
      {  
         case MotionEvent.ACTION_DOWN: {  
          System.out.println("Action down"+x +"::"+y);  
          if( dialogRegion.contains(x, y) == true)  
           this.finish();  
            
         }  
      }  
       
    return true;  
    }  
}