新手开发tabhost的时候求助
布局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TabHost android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/thid">
</TabHost>
<TextView android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tv1"
android:text="text1"/>
<TextView android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tv2"
android:text="text2"/>
<TextView android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/tv3"
android:text="text3"/>
</RelativeLayout>
activity:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabspace);
tabHost = (TabHost)this.findViewById(R.id.thid);
ts1 = tabHost.newTabSpec("tab1");
ts2 = tabHost.newTabSpec("tab2");
ts3 = tabHost.newTabSpec("tab3");
ts1.setContent(R.id.tv1);//这执行这行代码的时候报错
ts2.setContent(R.id.tv2);
ts3.setContent(R.id.tv3);
tabHost.addTab(ts1);
tabHost.addTab(ts2);
tabHost.addTab(ts3);
}
报错信息：
11-01 12:26:28.085: E/AndroidRuntime(299): FATAL EXCEPTION: main
11-01 12:26:28.085: E/AndroidRuntime(299): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.flp.control/com.flp.control.TabspaceActivity}: java.lang.NullPointerException
11-01 12:26:28.085: E/AndroidRuntime(299): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.os.Handler.dispatchMessage(Handler.java:99)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.os.Looper.loop(Looper.java:123)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.app.ActivityThread.main(ActivityThread.java:4627)
11-01 12:26:28.085: E/AndroidRuntime(299): at java.lang.reflect.Method.invokeNative(Native Method)
11-01 12:26:28.085: E/AndroidRuntime(299): at java.lang.reflect.Method.invoke(Method.java:521)
11-01 12:26:28.085: E/AndroidRuntime(299): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-01 12:26:28.085: E/AndroidRuntime(299): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-01 12:26:28.085: E/AndroidRuntime(299): at dalvik.system.NativeStart.main(Native Method)
11-01 12:26:28.085: E/AndroidRuntime(299): Caused by: java.lang.NullPointerException
11-01 12:26:28.085: E/AndroidRuntime(299): at android.widget.TabHost$ViewIdContentStrategy.<init>(TabHost.java:586)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.widget.TabHost$ViewIdContentStrategy.<init>(TabHost.java:581)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.widget.TabHost$TabSpec.setContent(TabHost.java:438)
11-01 12:26:28.085: E/AndroidRuntime(299): at com.flp.control.TabspaceActivity.onCreate(TabspaceActivity.java:27)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-01 12:26:28.085: E/AndroidRuntime(299): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
11-01 12:26:28.085: E/AndroidRuntime(299): ... 11 more
11-01 12:30:22.085: E/AndroidRuntime(323): FATAL EXCEPTION: main
11-01 12:30:22.085: E/AndroidRuntime(323): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.flp.control/com.flp.control.TabspaceActivity}: java.lang.NullPointerException
11-01 12:30:22.085: E/AndroidRuntime(323): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.os.Handler.dispatchMessage(Handler.java:99)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.os.Looper.loop(Looper.java:123)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.app.ActivityThread.main(ActivityThread.java:4627)
11-01 12:30:22.085: E/AndroidRuntime(323): at java.lang.reflect.Method.invokeNative(Native Method)
11-01 12:30:22.085: E/AndroidRuntime(323): at java.lang.reflect.Method.invoke(Method.java:521)
11-01 12:30:22.085: E/AndroidRuntime(323): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-01 12:30:22.085: E/AndroidRuntime(323): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-01 12:30:22.085: E/AndroidRuntime(323): at dalvik.system.NativeStart.main(Native Method)
11-01 12:30:22.085: E/AndroidRuntime(323): Caused by: java.lang.NullPointerException
11-01 12:30:22.085: E/AndroidRuntime(323): at android.widget.TabHost$ViewIdContentStrategy.<init>(TabHost.java:586)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.widget.TabHost$ViewIdContentStrategy.<init>(TabHost.java:581)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.widget.TabHost$TabSpec.setContent(TabHost.java:438)
11-01 12:30:22.085: E/AndroidRuntime(323): at com.flp.control.TabspaceActivity.onCreate(TabspaceActivity.java:27)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-01 12:30:22.085: E/AndroidRuntime(323): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
11-01 12:30:22.085: E/AndroidRuntime(323): ... 11 more
我很奇怪的是，怎么会抛空指针呢，我用debug看了，R.id.tv1是有值的，ts1也不为空，不知道这是怎么回事，请老师们指点下
android:text="text1" />
<TextView
android:id="@+id/tv2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="text2" />
<TextView
android:id="@+id/tv3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="text3" />
</FrameLayout>
</TabHost>
</RelativeLayout>
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabspace);
TabHost tabHost = (TabHost) this.findViewById(R.id.thid);
tabHost.setup();
TabSpec ts1 = tabHost.newTabSpec("tab1");
TabSpec ts2 = tabHost.newTabSpec("tab2");
TabSpec ts3 = tabHost.newTabSpec("tab3");
ts1.setIndicator("tab1");
ts2.setIndicator("tab2");
ts3.setIndicator("tab3");
ts1.setContent(R.id.tv1);// 这执行这行代码的时候报错
ts2.setContent(R.id.tv2);
ts3.setContent(R.id.tv3);
tabHost.addTab(ts1);
tabHost.addTab(ts2);
tabHost.addTab(ts3);
}