簡單談談Resource，Drawable和Bitmap之間的轉換，drawablebitmap

簡單談談Resource，Drawable和Bitmap之間的轉換，drawablebitmap

一直接觸這些東西，還是歸個類整理一下比較好。

 

Resource -> Drawable

Drawable draw1 = this.getResources().getDrawable(R.drawable.icon);

Drawable -> Bitmap

1.

 

static Bitmap drawableToBitmap(Drawable drawable) // drawable 轉換成bitmap  {      int width = drawable.getIntrinsicWidth();// 取drawable的長寬      int height = drawable.getIntrinsicHeight();      Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ?Bitmap.Config.ARGB_8888:Bitmap.Config.RGB_565;// 取drawable的顏色格式      Bitmap bitmap = Bitmap.createBitmap(width, height, config);// 建立對應bitmap      Canvas canvas = new Canvas(bitmap);// 建立對應bitmap的畫布      drawable.setBounds(0, 0, width, height);      drawable.draw(canvas);// 把drawable內容畫到畫布中      return bitmap;  }  

2.

Bitmap bitmap = ((android.graphics.drawable.BitmapDrawable) pm.getApplicationIcon(appInfo)).getBitmap();

 

android 怎把bitmap 轉換為drawable

Bitmap轉Drawable：
Bitmap bitmap = new Bitmap (...);
Drawable drawable = new BitmapDrawable(bitmap );
這個應該行
 
android 中怎將 Rdrawable裡面的圖片資源轉成換Bitmap型

Bitmap bmp=BitmapFactory.decodeResource(r, R.drawable.icon);
Bitmap newb = Bitmap.createBitmap( 300, 300, Config.ARGB_8888 );
Canvas canvasTemp = new Canvas( newb );
canvasTemp.drawBitmap(bmp, 50, 50, p);