android设立壁纸

android设置壁纸
package com.example.android.apis.app;  
 
// Need the following import to get access to the app resources, since this  
// class is in a sub-package.  
import com.example.android.apis.R;  
 
import java.io.IOException;  
 
import android.app.Activity;  
import android.app.WallpaperManager;  
import android.graphics.Color;  
import android.graphics.PorterDuff;  
import android.graphics.drawable.Drawable;  
import android.os.Bundle;  
import android.view.View;  
import android.view.WindowManager;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.ImageView;  
 
/** 
* <h3>SetWallpaper Activity</h3> 
* 
* <p>This demonstrates the how to write an activity that gets the current system wallpaper, 
* modifies it and sets the modified bitmap as system wallpaper.</p> 
*/ 
public class SetWallpaperActivity extends Activity {  
    final static private int[] mColors =  
            {Color.BLUE, Color.GREEN, Color.RED, Color.LTGRAY, Color.MAGENTA, Color.CYAN,  
                    Color.YELLOW, Color.WHITE};  
 
    /** 
     * Initialization of the Activity after it is first created.  Must at least 
     * call [email protected] android.app.Activity#setContentView setContentView()} to 
     * describe what is to be displayed in the screen. 
     */ 
    @Override 
    protected void onCreate(Bundle savedInstanceState) {  
        // Be sure to call the super class.  
        super.onCreate(savedInstanceState);  
        // See res/layout/wallpaper_2.xml for this  
        // view layout definition, which is being set here as  
        // the content of our screen.  
        setContentView(R.layout.wallpaper_2);  
        final WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);  
        final Drawable wallpaperDrawable = wallpaperManager.getDrawable();  
        final ImageView imageView = (ImageView) findViewById(R.id.imageview);  
        imageView.setDrawingCacheEnabled(true);  
        imageView.setImageDrawable(wallpaperDrawable);  
 
        Button randomize = (Button) findViewById(R.id.randomize);  
        randomize.setOnClickListener(new OnClickListener() {  
            public void onClick(View view) {  
                int mColor = (int) Math.floor(Math.random() * mColors.length);  
                wallpaperDrawable.setColorFilter(mColors[mColor], PorterDuff.Mode.MULTIPLY);  
                imageView.setImageDrawable(wallpaperDrawable);  
                imageView.invalidate();  
            }  
        });  
 
        Button setWallpaper = (Button) findViewById(R.id.setwallpaper);  
        setWallpaper.setOnClickListener(new OnClickListener() {  
            public void onClick(View view) {  
                try {  
                    wallpaperManager.setBitmap(imageView.getDrawingCache());  
                    finish();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        });  
    }