问如何用一个按钮更改布局顺序？

EN

我已经创建了一个包含3个RelativeLayout的布局。其中2是无形的，我想让他们可见和顶部当我按一个按钮。有可能吗？

我怎样才能让android：

layout_below="@id/pag6a_1"

以编程的方式？

这让我犯了个错误！这是我的代码：‘受保护的空虚onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState)；setContentView(R.layout.pag6a)；

    RelativeLayout pag6a_2 = (RelativeLayout) findViewById(R.id.pag6a_2);
    RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) pag6a_2.getLayoutParams();

    pag6a_2.setVisibility(View.VISIBLE);
    params.addRule(RelativeLayout.BELOW, R.id.pag6a_3);`

..and这是我的逻辑猫：

10-10 21:27:11.025: E/AndroidRuntime(3117)：致命例外:主10-10 21:27:11.025: E/AndroidRuntime(3117)：java.lang.RuntimeException:无法启动活动android.app.ActivityThread.performLaunchActivity(ActivityThread.：android.widget.LinearLayout$LayoutParams不能转换为android.widget.RelativeLayout$LayoutParams 10-10 21:27:11.025: E/AndroidRuntime(3117)：at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 10-10 21:27:11.025: E/AndroidRuntime(3117)：在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 10-10 21:27:11.025: E/AndroidRuntime(3117)：在android.app.ActivityThread.access$600(ActivityThread.java:141) 10-10 21:27:11.025: E/AndroidRuntime(3117)：android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 10-10 21:27: 27:27:27:27：11.025: E/AndroidRuntime(3117)：android.os.Handler.dispatchMessage(Handler.java:99) 10-10 21:27:11.025: E/AndroidRuntime(3117)：android.os.Looper.loop(Looper.java:137) 10-1021:27:11.025: E/AndroidRuntime(3117)：at android.app.ActivityThread.main(ActivityThread.java:5041) 10-1021:27:11.025: E/AndroidRuntime(3117)：在java.lang.reflect.Method.invoke(Method.java:511) (原生方法) 10-10 21:27:11.025: E/AndroidRuntime(3117)：at java.lang.reflect.Method.invokeNative 10-10 21:27:11.025: E/AndroidRuntime(3117)：at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 10-10 21:27:11.025: E/AndroidRuntime(3117)：at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 10-10 21:27:11.025: E/AndroidRuntime(3117)：at dalvik.system.NativeStart.main(原生方法) 10-10 21:27:11.025: E/AndroidRuntime(3117)：由: java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams引起的不能转换为android.widget.RelativeLayout$LayoutParams 10-1021:11.025: E/AndroidRuntime(3117)：at com.beandroid.pirani.Pag6A.onCreate(10-10 21:27:11.025: E/AndroidRuntime(3117)：android.app.Activity.performCreate(Activity.java:5104) 10-10 21: 11.025: E/AndroidRuntime(3117)：android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 10-10 21:27:11.025: E/AndroidRuntime(3117)：android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 10-10 21：27:11.025: E/AndroidRuntime(3117)：. 11