android 动态改变图片大小

时间 2021-08-12

标签 ide 函数布局 spa server get class List float 栏目 Android 繁體版

原文原文链接

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);