Question

我有一个MainActivity.java，其中TabHost声明如下：

Intent intent_comment   = new Intent(this,Comments.class);
createTab("Comments",intent_comment);

private void createTab(String text ,Intent intent)
{               tabHost.addTab(tabHost.newTabSpec(text).setIndicator(createTabView(text)).setContent(intent));
}

然后在这个Comments.class内，页面上只有4个按钮，按下按钮后，我想显示Comment_movie.class：scrollview（只是像一个网页，里面有按钮，这样当按下按钮时，它会调用其他活动。

因此，我所做的只是在Comments.class

内

public void button_story_movie_click (View view) 
{
    Intent intent = new Intent (Comments.this, Comment_movie.class);
    startActivity(intent);
    Comments.this.finish();    
}

但后来出现错误，

logcat如下：

06-09 13:02:27.185: E/AndroidRuntime(24252): FATAL EXCEPTION: main
06-09 13:02:27.185: E/AndroidRuntime(24252): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.abc.abc/com.abc.abc.Comment_movie}: java.lang.ClassCastException: com.abc.abc.Comment_movie cannot be cast to android.app.Activity
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2034)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.app.ActivityThread.access$700(ActivityThread.java:140)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.os.Looper.loop(Looper.java:137)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.app.ActivityThread.main(ActivityThread.java:4921)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at java.lang.reflect.Method.invokeNative(Native Method)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at java.lang.reflect.Method.invoke(Method.java:511)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at dalvik.system.NativeStart.main(Native Method)
06-09 13:02:27.185: E/AndroidRuntime(24252): Caused by: java.lang.ClassCastException: com.abc.abc.Comment_movie cannot be cast to android.app.Activity
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
06-09 13:02:27.185: E/AndroidRuntime(24252):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2025)
06-09 13:02:27.185: E/AndroidRuntime(24252):    ... 11 more

问题/意图：

我如何在TabHost内调用另一个活动？是否可以通过替换原始Comments布局（它是所谓的片段？）来显示目标活动，仍然显示屏幕顶部的选项卡？

非常感谢!!我是新手使用TabHost但卡住了。在此先感谢您的帮助！

Answer 1

Comment_movie应该扩展活动：

public class Comment_movie extends Activity {

    // ...class content
}

android TabHost调用另一个Activity

logcat如下：

问题/意图：

1 个答案: