当我将位图从SDCard转换为Drawable时，嘿有一些奇怪的东西出现在调整大小：
String sdDir = Environment.getExternalStorageDirectory().getPath();
String filename = "test.png"; //420px X 420px
Drawable tmpDraw;
Bitmap tmpBit = BitmapFactory.decodeFile(sdDir+filename);
Log.e("BAH","Bitmap height:"+tmpBit.getHeight()); //420
tmpDraw = (Drawable) new BitmapDrawable(getResources(),tmpBit);
int height = tmpDraw.getMinimumHeight();
Log.e("BAH","Drawable height:"+height); //420
我假设我需要一个参考点来扩展？如果从SDCard读取文件，它是否被归类为MDPI，这就是重新调整的原因？我目前正在使用Nexus 7来测试哪个是TVDPI . 我希望缩放发生就像Bitmap在HDPI中一样 .
任何建议将不胜感激！
以为我已经破解了它：
String sdDir = Environment.getExternalStorageDirectory().getPath();
String filename = "test.png"; //420px X 420px
Drawable tmpDraw;
BitmapFactory.Options options = new BitmapFactory.Options();
DisplayMetrics metrics = getApplicationContext().getResources().getDisplayMetrics();
options.inDensity = 240; //Being DPI for HDPI
options.inTargetDensity=metrics.densityDpi; //Being current DPI
//inDensity/inTargetDensity are a ratio
Bitmap tmpBit = BitmapFactory.decodeFile(sdDir+filename,options);
Log.e("BAH","Bitmap height:"+tmpBit.getHeight()); //373 Correct for TVDPI
tmpDraw = (Drawable) new BitmapDrawable(getResources(),tmpBit);
int height = tmpDraw.getMinimumHeight();
Log.e("BAH","Drawable height:"+height); //373 Correct for TVDPI
这是一种可以接受的方式吗？
1 回答
是的，你应该将
Resources传递给BitmapDrawable构造函数，这样就不会搞砸了 .