Android-android 控件层叠

Question

就是图片a 和图片b 需要a的左边一点点大概5dp的样子能够覆盖b上面，同时点击之后反过来b右边的5dp能够覆盖在a上面，应该怎么做，给个思路......

Answer 1

哈哈，找到一个方法：
布局弄成 RelativeLayout，然后加入两个 ImageView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/dummy_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<ImageView
android:id="@+id/dummy_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#0F0"
android:contentDescription="@string/hello_world"
android:scaleType="fitStart"
android:src="@drawable/ic_launcher" />

<ImageView
android:id="@+id/dummy_right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="40dp"
android:background="#F00"
android:contentDescription="@string/hello_world"
android:scaleType="fitStart"
android:src="@drawable/ic_launcher" />

</RelativeLayout>

然后 Activity 如下：

public class MainActivity extends Activity {

private RelativeLayout layout;
private ImageView left;
private ImageView right;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

layout = (RelativeLayout) findViewById(R.id.dummy_layout);
left = (ImageView) findViewById(R.id.dummy_left);
right = (ImageView) findViewById(R.id.dummy_right);

left.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
layout.removeAllViews();
layout.addView(right);
layout.addView(left);
}
});

right.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
layout.removeAllViews();
layout.addView(left);
layout.addView(right);
}
});

}
}

点击对应的 ImageView 就能让对应的 View 压在上面
至于重新绘制 Bitmap 的方法，比不过这种方法来的快捷

祝好，
斑驳敬上