将多幅图片保存到SD卡

Question

我的项目在绘制& 30张图片我想保存/所有这些图像到SD卡复制点击一个按钮。我使用下面的代码将图像保存到SD卡，但我不想将此代码复制粘贴30次以保存所有图像。那么是否有更好的解决方案来解决这个问题。谢谢

 Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.aurora); 
     String fileName = "aurora.png"; 

     File sd = Environment.getExternalStorageDirectory(); 
     File folder = new File(sd + "/Wallpaper Pack"); 
     folder.mkdir(); 

     File dest = new File(folder, fileName); 
     try { 
      FileOutputStream out; 
      out = new FileOutputStream(dest); 
      bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); 
      out.flush(); 
      out.close(); 
     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

Answer 1

它非常简单，创建一个数组并循环它。

int[] drawablesArr = {R.id.name1, R.id.name2, ....} 

for(int i=0l i<=drawablesArr.length; i++){ 
    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), drawablesArr[i]); 
     String fileName = "image_"+ String.valueOf(i)+".png" ; 

     File sd = Environment.getExternalStorageDirectory(); 
     File folder = new File(sd + "/Wallpaper Pack"); 
     folder.mkdir(); 

     File dest = new File(folder, fileName); 
     try { 
      FileOutputStream out; 
      out = new FileOutputStream(dest); 
      bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); 
      out.flush(); 
      out.close(); 
     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
} 

Answer 2

@Murtaza Hussain的答案是正确的，但最好从UI（主）线程运行这样的操作。所以，你可以使用ThreadPoolExecutor：

// SaveThread.java 
public class SaveThread implements Runnable { 

    private int drawable; 
    private String fileName; 
    private Context context; 

    public SaveThread(Context context, int drawable, String fileName) { 
     this.drawable = drawable; 
     this.fileName = fileName; 
     this.context = context; 
    } 

    @override 
    public void run() { 
     Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), drawable); 

     File dest = new File(Environment.getExternalStorageDirectory(), "WallpaperPack/" + fileName); 
     dest.getParentFile().mkdirs(); 

     try { 
      FileOutputStream out = new FileOutputStream(dest); 
      bitmap.compress(CompressFormat.PNG, 100, out); 
      out.flush(); 
      out.close(); 
     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 

} 

您的活动中

然后或其他组件：

int core = Runtime.getRuntime().availableProcessors(); 
ExecutorService executor = 
     new ThreadPoolExecutor(
       core + 1, 
       core * 2 + 1, 
       60l, 
       TimeUnit.SECONDS, 
       new LinkedBlockingQueue<Runnable>() 
       ); 

int[] drawables = {R.id.name1, R.id.name2, ....} 

for(int drawable : drawables) { 
    executor.execute(new SaveThread(getApplicationContext(), drawable, "image_"+ drawable +".png")); 
} 

executor.shutdown();