Api demo源码学习（13）--App/Activity/SetWallpaper

本节实现了设置桌面壁纸的功能。

实现一个WallpaperManager实例，调用wallpaperManager.setBitmap()函数设置桌面壁纸。

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};

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        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);

        // 点击此button实现随机的修改image的颜色的功能

        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();

            }

        });

        // 点击此button修改桌面背景

        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();

                }

            }

        });

    }

}

以上即可。