android 动态改变图片大小

在oncreate中,使用getheight等函数不能得到控件大小,获得的为0
ide

应使用其余方法函数


Resources res = getResources();布局

final ImageView view=(ImageView)findViewById(R.id.IV_about);spa

final Drawable drawable=res.getDrawable(R.drawable.ic_about);server


DisplayMetrics dm = new DisplayMetrics();get

getWindowManager().getDefaultDisplay().getMetrics(dm);it

final int screen_height = dm.heightPixels ;//高度class


ViewTreeObserver vto = view.getViewTreeObserver(); List

vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() float

public boolean onPreDraw() { 

int height = (int) ((float) view.getMeasuredWidth()/drawable.getMinimumWidth() * drawable.getMinimumHeight());

int width = view.getMeasuredWidth(); 

LinearLayout.LayoutParams linearParams =(LinearLayout.LayoutParams) view.getLayoutParams(); //取控件textView当前的布局参数  

linearParams.height = height;

linearParams.width = view.getMeasuredWidth();

linearParams.topMargin=screen_height/10;

view.setLayoutParams(linearParams);

view.setImageResource(R.drawable.ic_about);

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