如何在Android中使用onTouch设置imageview的高度和宽度

Question

我正在使用下面的代码来设置imageview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Java：

@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，它什么也没做。

Answer 1

尝试这个

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

希望它对您有用。

Answer 2

尝试这个：

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;
         }
     }
}

Answer 3

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