2017-02-12 45 views
0

我想通過gallery.I圖像中的位置的位置加載資源到位圖。我得到正確的文本設置「drawableId」,但當它設置爲字符串和引用在代碼的位圖行在代碼行Bitmap b = BitmapFactory.decodeResource(getResources(), a)中出現錯誤「a」。如何從字符串獲取資源變量爲bitmapFactory

如果我用a替代R.drawable.pg1它可以正常工作。

String a = drawableId.getText().toString();   
Bitmap b = BitmapFactory.decodeResource(getResources(), a); 
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View view) { 
      postPicture(); 
     } 

     public boolean postPicture() { 
      String a = drawableId.getText().toString(); 

      Bitmap b = BitmapFactory.decodeResource(getResources(), (a)); 
      Intent share = new Intent(Intent.ACTION_SEND); 
      share.setType("image/*"); 
      ByteArrayOutputStream bytes = new ByteArrayOutputStream(); 
      b.compress(Bitmap.CompressFormat.JPEG, 100, bytes); 
      File f = new File(Environment.getExternalStorageDirectory() + File.separator + "temporary_file.jpg"); 
      try { 
       f.createNewFile(); 
       FileOutputStream fo = new FileOutputStream(f); 
       fo.write(bytes.toByteArray()); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
      share.putExtra(Intent.EXTRA_STREAM, Uri.parse("file:///sdcard/temporary_file.jpg")); 
      startActivity(Intent.createChooser(share, "Share image File")); 

有關如何解決此問題的任何想法?提前致謝!

+0

你需要檢查的文檔。所需的第二個參數是一個int,它是不需要字符串的資源ID。所以這** R.drawable.pg1 **應該工作正常 – Raghunandan

+0

[decodeResource](https://developer.android.com/reference/android/graphics/BitmapFactory.html#decodeResource(android.content.res.Resources,% 20int))接受一個int作爲第二個參數,而不是一個字符串。您應該確實閱讀您的錯誤消息 –

+0

https://stackoverflow.com/a/38447612/115145 – CommonsWare

回答

0

對於不同的方式嘗試這個辦法:

int id = getResources().getIdentifier(a, "id", getPackageName()); 
Drawable drawable = getResources().getDrawable(id); 

Bitmap b = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888); 
Canvas canvas = new Canvas(b); 
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); 
drawable.draw(canvas); 
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