SDカードから画像を読み込むときのgridviewとsetImageBitmap

Question

SDカードから画像を読み込むためにgridviewを作成したいと思います。私はインターネットから多くの情報を見つけましたが、成功することはできません。

次のコードを実行すると、強制終了されます。

私はこの問題はimageView.setImageBitmap(bmp);

ですが、私は、このコードの間違ったのか分からないことがわかります。

誰かが私にこの問題の解決を手伝ってくれることを願っています。

public class GridActivity extends Activity { 

    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.grid_activity); 
     GridView gridview = (GridView)findViewById(R.id.GridView01);  
     gridview.setAdapter(new ImageAdapter(this));  
     gridview.setOnItemClickListener(new OnItemClickListener() {   
      public void onItemClick(AdapterView<?> parent, View v, int position, long id) {    
       Toast.makeText(GridActivity.this, "" + position, Toast.LENGTH_SHORT).show();   
       }  
      }); 
     } 

    public class ImageAdapter extends BaseAdapter {  
      File dir=new File(Environment.getExternalStorageDirectory(),"/images/bedroom"); 
      int count=dir.list().length; 
      String[] fileNames = dir.list(); 
      private Context mContext; 
     public ImageAdapter(Context c) {   
      mContext = c;  
      }  
     public int getCount() {   
      return count;  
      }  
     public Object getItem(int position) {   
      return null;  
      }  
     public long getItemId(int position) {   
      return 0;  
      }  
     public View getView(int position, View convertView, ViewGroup parent) {   
      ImageView imageView = null; 

      if (convertView == null) { 
       // if it's not recycled, initialize some attributes    
       imageView = new ImageView(mContext);    
       imageView.setLayoutParams(new GridView.LayoutParams(85, 85));    
       imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);    
       imageView.setPadding(8, 8, 8, 8); 
       } else { 
       imageView = (ImageView) convertView;   
       } 
      Bitmap bmp = BitmapFactory.decodeFile(dir.getPath() + "/" + fileNames[position]); 
      imageView.setImageBitmap(bmp); 
      toast(dir.getPath() + "/" + fileNames[position]); 
      return imageView;  
     } 

     public View getView1(int arg0, View arg1, ViewGroup arg2) { 
      // TODO Auto-generated method stub 
      return null; 
     } 
    } 

    public void toast (String msg) 
    { 
     Toast.makeText (getApplicationContext(), msg, Toast.LENGTH_SHORT).show(); 
    } 
} 

エラーログ：あなたはあなたのイメージファイルが大きすぎると思われる投稿エラーから

08-11 23:52:38.874: ERROR/MBGlossaryManager(5395): lib_glossary.so can't be loaded<br/> 
08-11 23:52:49.710: ERROR/dalvikvm-heap(5395): 10036224-byte external allocation too large for this process.<br/> 
08-11 23:52:49.710: ERROR/(5395): VM won't let us allocate 10036224 bytes.<br/> 
08-11 23:52:49.710: ERROR/AndroidRuntime(5395): Uncaught handler: thread main exiting due to uncaught exception.<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395): java.lang.OutOfMemoryError: bitmap size exceeds VM budget.<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.graphics.BitmapFactory.nativeDecodeStream(Native Method).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:459).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:271).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:296).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at com.easyhome.GridActivity$ImageAdapter.getView(GridActivity.java:81).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.AbsListView.obtainView(AbsListView.java:1291).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.GridView.makeAndAddView(GridView.java:1218).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.GridView.makeRow(GridView.java:265).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.GridView.fillDown(GridView.java:218).<br/> 
08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.GridView.fillFromTop(GridView.java:337).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.GridView.layoutChildren(GridView.java:1112).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.AbsListView.onLayout(AbsListView.java:1130).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.view.View.layout(View.java:6942).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.LinearLayout.onLayout(LinearLayout.java:918).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.view.View.layout(View.java:6942).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.FrameLayout.onLayout(FrameLayout.java:333).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.view.View.layout(View.java:6942).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.LinearLayout.onLayout(LinearLayout.java:918).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.view.View.layout(View.java:6942) 
08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.widget.FrameLayout.onLayout(FrameLayout.java:333).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.view.View.layout(View.java:6942).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.view.ViewRoot.performTraversals(ViewRoot.java:1007).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1656).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.os.Handler.dispatchMessage(Handler.java:99).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.os.Looper.loop(Looper.java:136).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at android.app.ActivityThread.main(ActivityThread.java:4425).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at java.lang.reflect.Method.invokeNative(Native Method).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at java.lang.reflect.Method.invoke(Method.java:521).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:850).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608).<br/> 

08-11 23:52:49.764: ERROR/AndroidRuntime(5395):  at dalvik.system.NativeStart.main(Native Method).<br/> 

Answer 1

java.lang.OutOfMemoryError: bitmap size exceeds VM budget.

。どのくらいのメモリが必要ですか？画像を最適化してみてください。

Answer 2

グリッドビューでは、sdcardからイメージを表示するために元の解像度イメージは必要ありません。 BitmapFactory.Options.inSampleSizeを使用すると、常に小さなサイズの画像を取得できます。これによりメモリ例外が発生することはありません。

BitmapFactory.Options opt = new BitmapFactory.Options(); 
opt.inSampleSize = 5; //any value greater than 1 
Bitmap bmp = BitmapFactory.decodeFile(dir.getPath() + "/" + fileNames[position],opt);