Android 计算控件尺寸

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

final ImageView imageView = (ImageView) findViewById(R.id.imageview);

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);

System.out.println("执行完毕.."+System.currentTimeMillis());

}

//------------------------------------------------方法一

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);

//-----------------------------------------------方法二

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;

}

});

//-----------------------------------------------方法三

ViewTreeObserver vto2 = imageView.getViewTreeObserver();

vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

@Override

public void onGlobalLayout() {

imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);

textView.append("\n\n"+imageView.getHeight()+","+imageView.getWidth());

}

});