android 動(dòng)態(tài)改變圖片大小

發(fā)布時(shí)間：2020-07-21 16:15:14 來源：網(wǎng)絡(luò) 閱讀：927 作者：elvvvin 欄目：移動(dòng)開發(fā)

在oncreate中，使用getheight等函數(shù)不能獲得控件大小，得到的為0

應(yīng)使用其他方法

Resources res = getResources();

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

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

DisplayMetrics dm = new DisplayMetrics();

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

final int screen_height = dm.heightPixels ;//高度

ViewTreeObserver vto = view.getViewTreeObserver();

vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {

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當(dāng)前的布局參數(shù)

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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