Android 安卓呼叫功能标签点击？

我试图调用一个函数来打开一个活动，但它不起作用。请给我一些解决办法

我正在尝试此代码，但显示空指针异常

在这一行“tabHost.getChildAt（2.setOn）”显示错误

请给我一些解决办法

谢谢

堆栈跟踪：

04-02 23:02:24.685: E/AndroidRuntime(23622): FATAL EXCEPTION: main
04-02 23:02:24.685: E/AndroidRuntime(23622): Process: com.speedlock, PID: 23622
04-02 23:02:24.685: E/AndroidRuntime(23622): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.speedlock/com.speedlock.Home}: java.lang.NullPointerException
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.os.Handler.dispatchMessage(Handler.java:102)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.os.Looper.loop(Looper.java:136)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.app.ActivityThread.main(ActivityThread.java:5017)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at java.lang.reflect.Method.invokeNative(Native Method)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at java.lang.reflect.Method.invoke(Method.java:515)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at dalvik.system.NativeStart.main(Native Method)
04-02 23:02:24.685: E/AndroidRuntime(23622): Caused by: java.lang.NullPointerException
04-02 23:02:24.685: E/AndroidRuntime(23622):    at com.speedlock.Home.onCreate(Home.java:50)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.app.Activity.performCreate(Activity.java:5231)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-02 23:02:24.685: E/AndroidRuntime(23622):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-02 23:02:24.685: E/AndroidRuntime(23622):    ... 11 more

---

我已经解决了iisu问题请把代码改成这个

tabHost.getTabWidget().getChildAt(2).setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int action = event.getAction();

            if(action == MotionEvent.ACTION_UP)
            {
                Toast.makeText(getApplicationContext(), "ss", 3000).show();
                //Something to do

                return true; // do this if you dont want the tab to change
            }
            return false;
        }
    });

---

我已经添加了satck跟踪，请检查

tabHost.getTabWidget().getChildAt(2).setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int action = event.getAction();

            if(action == MotionEvent.ACTION_UP)
            {
                Toast.makeText(getApplicationContext(), "ss", 3000).show();
                //Something to do

                return true; // do this if you dont want the tab to change
            }
            return false;
        }
    });