如何在安卓中使用onTouch设置图像视图的高度和宽度

Question

我使用以下代码来设置图像视图的宽度。 但它不起作用。

.xml：

'

    <ImageView
        android:id="@+id/card2"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="3dp"
        android:layout_marginTop="120dp"
        android:layout_toRightOf="@+id/card1"
        android:contentDescription="@string/slot"
        android:src="@drawable/spade_3" />`

和爪哇：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_play__computer);
    card1 = (ImageView)findViewById(R.id.card1);
    card2 = (ImageView)findViewById(R.id.card2);           
    card1.setOnTouchListener(new ChoiceTouchListener());
    card2.setOnTouchListener(new ChoiceTouchListener());
}
private final class ChoiceTouchListener implements OnTouchListener{
     public boolean onTouch(View v, MotionEvent event) {
         if (event.getAction() == MotionEvent.ACTION_DOWN){
             v.getLayoutParams().width = 100;
             return true;
         } else{
             return false;
         }
     }
}

当我触摸图像视图时，它什么也不做。

Answer 1

试试这个

RelativeLayout.LayoutParams param = (RelativeLayout.LayoutParams) v.getLayoutParams();
param.width=200;
v.setLayoutParams(param);

希望它能为你工作。

Answer 2

使用 LayoutParams 设置高度和宽度：

RelativeLayout layout = new RelativeLayout( this );
    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT,
            LayoutParams.WRAP_CONTENT);

您可以使用 View.getLayoutParams 从代码访问任何 LayoutParams

Answer 3

试试这个：

private final class ChoiceTouchListener implements OnTouchListener{
     public boolean onTouch(View v, MotionEvent event) {
         if (event.getAction() == MotionEvent.ACTION_DOWN){
             ImageView imgView = (ImageView) v;
             int width = 100;
             int height = 100;
             LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(width, height);
             imgView.setLayoutParams(layoutParams);
             return true;
         } else{
             return false;
         }
     }
}