android - 在 Android 上运行时移动小部件

Question

我有一个带有两个按钮的简单演示。它们在屏幕的顶部和底部使用 RelativeLayout 进行布局。
当我单击其中一个时，我希望它们交换位置。最好的方法是什么？

这是我的 res/layout/main.xml :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <ImageButton
        android:id="@+id/android_button_1"
        android:layout_width="200dip"
        android:layout_height="wrap_content"
        android:src="@drawable/icon"
        android:layout_alignParentTop="true" />

    <ImageButton
        android:id="@+id/android_button_2"
        android:layout_width="200dip"
        android:layout_height="wrap_content"
        android:src="@drawable/icon2"
        android:layout_alignParentBottom="true" />

</RelativeLayout>

这是我的 Activity :

public class HelloButtons extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        final ImageButton button1 = (ImageButton) findViewById(R.id.android_button_1);
        final ImageButton button2 = (ImageButton) findViewById(R.id.android_button_2);
        button1.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                // Perform action on clicks
                Toast.makeText(HelloButtons.this, "Beep Bop", Toast.LENGTH_SHORT).show();
            }
        });
        button2.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                // Perform action on clicks
                Toast.makeText(HelloButtons.this, "Beep Bop", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

Answer 1

按照这些思路使用一些东西

   RelativeLayout.LayoutParams lp1 = (LayoutParams) b1.getLayoutParams();
   RelativeLayout.LayoutParams lp2 = (LayoutParams) b2.getLayoutParams();

   lp2.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);
   lp2.addRule(RelativeLayout.ALIGN_PARENT_TOP, 0);
   lp1.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
   lp1.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, 0);

   b1.setLayoutParams(lp1);
   b2.setLayoutParams(lp2);

(反之再次恢复它们)在你的 OnClickListeners