Android multiple ImageView image stacked transparent area Click Event penetration

Multiple transparent image layers are often used, but click events of different images need to be obtained. This article implements click events in the transparent area of images.
:

1. The size of the two images is the same. Put them in the drawable directory:
Figure 1: transparent.png

 
Figure 2: transparent2.png

 
2. layout file, test. xml:
[Html]
<? Xml version = "1.0" encoding = "UTF-8"?>
<FrameLayout xmlns: android = "http://schemas.android.com/apk/res/android"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Android: orientation = "vertical"
Android: gravity = "center"
Android: id = "@ + id/mainLayout">

<ImageView android: id = "@ + id/ImageView01"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: src = "@ drawable/transparent"/>

<ImageView android: id = "@ + id/ImageView02"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: src = "@ drawable/transparent2"/>

</FrameLayout>

 
3. Upload the Activity file MainActivity. java
 
[Java]
Package org. shuxiang. test;
 
Import android. app. Activity;
Import android. graphics. Bitmap;
Import android. graphics. drawable. BitmapDrawable;
Import android. OS. Bundle;
Import android. util. Log;
Import android. view. MotionEvent;
Import android. view. View;
Import android. view. Window;
Import android. view. View. OnClickListener;
Import android. view. View. OnTouchListener;
Import android. widget. ImageView;
 
Public class MainActivity extends Activity
{
Private ImageView iv1;
Private ImageView iv2;
Private Bitmap bitmap1, bitmap2;
Private boolean iv1Transparent = false;
Private boolean iv2Transparent = false;
 
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
RequestWindowFeature (Window. FEATURE_NO_TITLE );
SetContentView (R. layout. test );
 
Iv1 = (ImageView) findViewById (R. id. ImageView01 );
Iv2 = (ImageView) findViewById (R. id. ImageView02 );
Bitmap1 = (BitmapDrawable) (iv1.getDrawable (). getBitmap ();
Bitmap2 = (BitmapDrawable) (iv2.getDrawable (). getBitmap ();

Iv1.setOnClickListener (new OnClickListener (){
@ Override
Public void onClick (View v ){
// TODO Auto-generated method stub
If (iv1Transparent)
{
Log. I ("test", "Figure 1 transparent area ");
}
Else
{
Log. I ("test", "Figure 1 click ");
}
}

});

Iv1.setOnTouchListener (new OnTouchListener ()
{
@ Override
Public boolean onTouch (View arg0, MotionEvent arg1)
{
// TODO Auto-generated method stub
If (bitmap1.getPixel (int) (arg1.getX (), (int) arg1.getY () = 0)
{
Log. I ("test", "Figure 1 transparent area ");
Iv1Transparent = true; // set the transparent area to true.
}
Else
{
Log. I ("test", "Figure 1 entity region ");
Iv1Transparent = false;
}
Return false;
}
});

Iv2.setOnClickListener (new OnClickListener ()
{
@ Override
Public void onClick (View v ){
// TODO Auto-generated method stub
If (iv2Transparent)
{
Log. I ("test", "Figure 2 transparent area ");
}
Else
{
Log. I ("test", "Figure 2 click ");
}
}

});

Iv2.setOnTouchListener (new OnTouchListener ()
{
@ Override
Public boolean onTouch (View v, MotionEvent event ){
// TODO Auto-generated method stub
If (bitmap2.getPixel (int) (event. getX (), (int) event. getY () = 0)
{
Log. I ("test", "Figure 2 transparent area ");
Iv2Transparent = true; // set the transparent area to true.
Iv1.dispatchTouchEvent (event );
}
Else
{
Log. I ("test", "Figure 2 entity region ");
Iv2Transparent = false;
}
Return false;
}
});
}
}