Android學習筆記(四) android 更換案頭壁紙—–WallpaperManager

Android 中壁紙管理主要由 WallpaperManager 這個類負責

 

 

Provides access to the system wallpaper. With WallpaperManager, you can get
the current wallpaper, get the desired dimensions for the wallpaper, set the
wallpaper, and more. Get an instance of WallpaperManager with getInstance().

 

 

他的初始化方法為

wallpaperManager = WallpaperManager.getInstance(this); 

 

擷取當前壁紙的方法為：

Drawable drawable = wallpaperManager.getDrawable();

 

設定一張圖片作為壁紙的方法為

 

 

BitmapDrawable source = new BitmapDrawable(path);</p><p> try {<br />wallpaperManager.setBitmap(source.getBitmap());<br />iv.setImageDrawable(source);<br />} catch (IOException e) {<br />// TODO Auto-generated catch block<br />e.printStackTrace();<br />} 

 

下面是實現效果：

 

 

更換壁紙後：

 

 

具體代碼為：

 

package young.MyWallPaperManager;<br />import java.io.File;<br />import java.io.FileInputStream;<br />import java.io.FileNotFoundException;<br />import java.io.IOException;<br />import java.io.InputStream;<br />import java.io.InputStreamReader;<br />import java.util.ArrayList;<br />import javax.security.auth.PrivateCredentialPermission;</p><p>import android.app.Activity;<br />import android.app.WallpaperManager;<br />import android.graphics.Bitmap;<br />import android.graphics.BitmapFactory;<br />import android.graphics.drawable.BitmapDrawable;<br />import android.graphics.drawable.Drawable;<br />import android.os.Bundle;<br />import android.view.ContextMenu;<br />import android.view.Menu;<br />import android.view.MenuItem;<br />import android.view.View;<br />import android.view.ContextMenu.ContextMenuInfo;<br />import android.view.View.OnClickListener;<br />import android.widget.Button;<br />import android.widget.EditText;<br />import android.widget.ImageView;<br />import android.widget.TextView;<br />public class MyWallPaperManager extends Activity {</p><p>private ImageView iv ;<br />private Button changeImageButton;<br />private TextView currentTextView;</p><p>private ArrayList<File> images ;<br />private WallpaperManager wallpaperManager;</p><p> /** Called when the activity is first created. */<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> setContentView(R.layout.main);</p><p> //獲得案頭壁紙<br /> wallpaperManager = WallpaperManager.getInstance(this);<br /> Drawable drawable = wallpaperManager.getDrawable();</p><p> iv = (ImageView)findViewById(R.id.imview);<br /> currentTextView = (TextView)findViewById(R.id.currentwall);<br /> changeImageButton =(Button)findViewById(R.id.ChangeWallpaperButton);</p><p> iv.setImageDrawable(drawable);</p><p> //registerForContextMenu(changeImageButton);<br /> changeImageButton.setOnCreateContextMenuListener(this);</p><p> //取得所有圖片<br /> images = new ArrayList<File>();<br /> getAllFiles(new File("/sdcard"));<br /> }</p><p> @Override<br /> public void onCreateContextMenu(ContextMenu menu,View view,<br /> ContextMenuInfo menuInfo){</p><p> menu.setHeaderTitle("點擊設定為案頭壁紙");<br /> for(int i = 0 ; i <images.size() ; i++){<br /> menu.add(0, i, i, images.get(i).getName());<br /> }<br /> }</p><p> @Override<br /> public boolean onContextItemSelected(MenuItem item){<br /> String name = (String) item.getTitle();<br /> //根據名字取得圖片<br /> String path = getElementByName(name).getPath();<br /> //<br /> BitmapDrawable source = new BitmapDrawable(path);</p><p> try {<br /> //設定為壁紙<br />wallpaperManager.setBitmap(source.getBitmap());<br />//顯示<br />iv.setImageDrawable(source);<br />} catch (IOException e) {<br />// TODO Auto-generated catch block<br />e.printStackTrace();<br />}<br /> return true;<br /> }</p><p> //取得所有png 和 jpg jpeg<br /> private void getAllFiles(File root){</p><p>File files[] = root.listFiles();</p><p>if(files != null)<br />for(File f:files){</p><p>if(f.isDirectory()){<br />getAllFiles(f);<br />}<br />else{<br />//檢查檔案類型<br />String fpath = f.getPath().substring(f.getPath().lastIndexOf(".")+1,f.getPath().length());<br />//如果是圖片<br />if(fpath.equals("png")||fpath.equals("jpg")){<br />images.add(f);<br />}<br />}<br />}<br /> }</p><p> private File getElementByName(String Name){<br /> for(int i = 0 ; i <images.size() ; i++){<br /> if(images.get(i).getName().equals(Name))<br /> return images.get(i);<br /> }<br /> return null;<br /> }</p><p>}<br />