2017-02-12 46 views
0

我想通过gallery.I图像中的位置的位置加载资源到位图。我得到正确的文本设置“drawableId”,但当它设置为字符串和引用在代码的位图行在代码行Bitmap b = BitmapFactory.decodeResource(getResources(), a)中出现错误“a”。如何从字符串获取资源变量为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")); 

有关如何解决此问题的任何想法?提前致谢!

+0

你需要检查的文档。所需的第二个参数是一个int,它是不需要字符串的资源ID。所以这** R.drawable.pg1 **应该工作正常 – Raghunandan

+0

[decodeResource](https://developer.android.com/reference/android/graphics/BitmapFactory.html#decodeResource(android.content.res.Resources,% 20int))接受一个int作为第二个参数,而不是一个字符串。您应该确实阅读您的错误消息 –

+0

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

回答

0

对于不同的方式尝试这个办法:

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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