Android不规则点击区域详解

 直接上代码：

1.demo代码，DemoActivity.java

package com.test.activity;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

import com.test.R;

public class DemoActivity extends Activity implements OnClickListener {
    
    private Toast mToast;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState);
        setContentView( R.layout.activity_main);
        findViewById( R.id.menu_1).setOnClickListener( this);
        findViewById( R.id.menu_2).setOnClickListener( this);
        findViewById( R.id.menu_3).setOnClickListener( this);
        findViewById( R.id.menu_4).setOnClickListener( this);
    }


    @Override
    public void onClick(View v) {
        if(null != mToast) {
            mToast.cancel();
        }
        switch(v.getId()) {
            case R.id.menu_1:
                mToast = Toast.makeText( this, "red", Toast.LENGTH_SHORT);
                break;
            case R.id.menu_2:
                mToast = Toast.makeText( this, "yellow", Toast.LENGTH_SHORT);
                break;
            case R.id.menu_3:
                mToast = Toast.makeText( this, "green", Toast.LENGTH_SHORT);
                break;
            case R.id.menu_4:
                mToast = Toast.makeText( this, "blue", Toast.LENGTH_SHORT);
                break;
        }
        mToast.show();
    }
}

2.自定义控件代码，MenuViewItem.java

package com.test.view;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.StateListDrawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.FrameLayout;

public class MenuViewItem extends FrameLayout {

     

    private int width = -1;

    private int height = -1;

    private Bitmap bitmap;

 

    public MenuViewItem(Context context) {

        super( context);

    }

 

    public MenuViewItem(Context context, AttributeSet attrs, int defStyle) {

        super( context, attrs, defStyle);

    }

 

    public MenuViewItem(Context context, AttributeSet attrs) {

        super( context, attrs);

    }

 

    @Override

    public boolean onTouchEvent(MotionEvent event) {

        int action = event.getAction();

        if(action != MotionEvent.ACTION_DOWN) {

            return super.onTouchEvent( event);

        }

        int x = (int)event.getX();

        int y = (int)event.getY();

        if(width == -1 || height == -1) {

            Drawable drawable = ((StateListDrawable)getBackground()).getCurrent();

            bitmap = ((BitmapDrawable)drawable).getBitmap();

            width = getWidth();

            height = getHeight();

        }

        if(null == bitmap || x < 0 || y < 0 || x >= width || y >= height) {

            return false;

        }

        int pixel = bitmap.getPixel( x, y);

        if(Color.TRANSPARENT == pixel) {

            return false;

        }

        return super.onTouchEvent( event);

    }

}

3.xml界面代码，activity_main.xml

<FrameLayout 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:gravity="center"
    android:orientation="vertical" >

    <com.test.view.MenuViewItem
        android:id="@+id/menu_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="@drawable/chrome_1" />

    <com.test.view.MenuViewItem
        android:id="@+id/menu_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="@drawable/chrome_2" />

    <com.test.view.MenuViewItem
        android:id="@+id/menu_3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="@drawable/chrome_3" />

    <com.test.view.MenuViewItem
        android:id="@+id/menu_4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="@drawable/chrome_4" />

</FrameLayout>

4.图片控件代码，chrome_1.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/chrome_1_s" android:state_pressed="true"/>
    <item android:drawable="@drawable/chrome_1_n"/>

</selector>

5.图片资源：