Android 设置壁纸

gistfile1.java

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 {@link 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();   
                }   
            }   
        });   
    }