android 获得墙纸

package com.sn.android.image;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class ImageDemoActivity extends Activity {

 private Button myBtn;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  myBtn = (Button) findViewById(R.id.btn_001);
  myBtn.setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View v) {
    WallpaperManager wallpaperManager = WallpaperManager
      .getInstance(ImageDemoActivity.this);
    Drawable d = wallpaperManager.getDrawable();
    if (d != null) {
     if (saveWP("shi", d)) {
      Toast.makeText(ImageDemoActivity.this, "Save ok",
        Toast.LENGTH_SHORT);
     }
    }
   }
  });

 }

 public boolean saveWP(String filename, Drawable drawble) {
  try {
   saveMyBitmap(filename, drawableToBitmap(drawble));

  } catch (Exception e) {
   e.printStackTrace();
   return false;
  }
  return true;

 }

 public static Bitmap drawableToBitmap(Drawable drawable) {

  Bitmap bitmap = Bitmap.createBitmap(

  drawable.getIntrinsicWidth(),

  drawable.getIntrinsicHeight(),

  drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888

  : Bitmap.Config.RGB_565);

  Canvas canvas = new Canvas(bitmap);

  canvas.setBitmap(bitmap);

  drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
    drawable.getIntrinsicHeight());

  drawable.draw(canvas);

  return bitmap;
 }

 public static void saveMyBitmap(String bitName, Bitmap mBitmap) {
  File f = new File("/sdcard/" + bitName + ".png");
  try {
   f.createNewFile();
  } catch (IOException e) {
   Log.e("vsc-sxz", "在保存图片时出错：" + e.toString());
  }
  FileOutputStream fOut = null;
  try {
   fOut = new FileOutputStream(f);
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
  mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
  try {
   fOut.flush();
  } catch (IOException e) {
   e.printStackTrace();
  }
  try {
   fOut.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
}