int screenWidth = getWindowManager().getDefaultDisplay().getWidth(); // 屏幕宽（像素，如：480px） 
int screenHeight = getWindowManager().getDefaultDisplay().getHeight(); // 屏幕高（像素，如：800p） 
Log.e(TAG + " getDefaultDisplay", "screenWidth=" + screenWidth + "; screenHeight=" + screenHeight); 

DisplayMetrics dm = new DisplayMetrics(); 
dm = getResources().getDisplayMetrics(); 
float density = dm.density; // 屏幕密度（像素比例：0.75/1.0/1.5/2.0） 
int densityDPI = dm.densityDpi; // 屏幕密度（每寸像素：120/160/240/320） 
float xdpi = dm.xdpi; 
float ydpi = dm.ydpi; 
Log.e(TAG + " DisplayMetrics", "xdpi=" + xdpi + "; ydpi=" + ydpi); 
Log.e(TAG + " DisplayMetrics", "density=" + density + "; densityDPI=" + densityDPI); 
screenWidth = dm.widthPixels; // 屏幕宽（像素，如：480px） 
screenHeight = dm.heightPixels; // 屏幕高（像素，如：800px） 
Log.e(TAG + " DisplayMetrics(111)", "screenWidth=" + screenWidth + "; screenHeight=" + screenHeight); 

dm = new DisplayMetrics(); 
getWindowManager().getDefaultDisplay().getMetrics(dm); 
density = dm.density; // 屏幕密度（像素比例：0.75/1.0/1.5/2.0） 
densityDPI = dm.densityDpi; // 屏幕密度（每寸像素：120/160/240/320） 
xdpi = dm.xdpi; 
ydpi = dm.ydpi; 
Log.e(TAG + " DisplayMetrics", "xdpi=" + xdpi + "; ydpi=" + ydpi); 
Log.e(TAG + " DisplayMetrics", "density=" + density + "; densityDPI=" + densityDPI); 
int screenWidthDip = dm.widthPixels; // 屏幕宽（dip，如：320dip） 
int screenHeightDip = dm.heightPixels; // 屏幕宽（dip，如：533dip） 
Log.e(TAG + " DisplayMetrics(222)", "screenWidthDip=" + screenWidthDip + "; screenHeightDip=" + screenHeightDip); 
screenWidth = (int)(dm.widthPixels * density + 0.5f); // 屏幕宽（px，如：480px） 
screenHeight = (int)(dm.heightPixels * density + 0.5f); // 屏幕高（px，如：800px） 
Log.e(TAG + " DisplayMetrics(222)", "screenWidth=" + screenWidth + "; screenHeight=" + screenHeight); 

int w = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 
int h = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 
imageView.measure(w, h); 
int height =imageView.getMeasuredHeight(); 
int width =imageView.getMeasuredWidth(); 
textView.append("\n"+height+","+width); 

ViewTreeObserver vto = imageView.getViewTreeObserver(); 
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { 
  public boolean onPreDraw() { 
    int height = imageView.getMeasuredHeight(); 
    int width = imageView.getMeasuredWidth(); 
    textView.append("\n"+height+","+width); 
    return true; 
  } 
}); 

ViewTreeObserver vto2 = imageView.getViewTreeObserver();  
vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
   @Override  
   public void onGlobalLayout() { 
    imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);  
    textView.append("\n\n"+imageView.getHeight()+","+imageView.getWidth()); 
  }  
});