的Android應用程序崩潰，而該分配onClickListener

我要分配一些的OnClickListener動態聲明存在於一個動態聲明LinearLayout元素，我爲了對付這些存在於LinearLayout的元素，但使用getChildAt()我OnClickListener內這樣做，我的應用程序崩潰，當我試圖刪除myChildAt()就讓它涉及與LinearLayout直接它工作得很好，這是我的代碼時：的Android應用程序崩潰，而該分配onClickListener

List<LinearLayout> inner_ver = new ArrayList<LinearLayout>(); 
    for(int i = 0 ; i < size ; i++){ 
     LinearLayout temp_inner_ver = new LinearLayout(this); 
     temp_inner_ver.setLayoutParams(temp_lay); 
     temp_inner_ver.setOrientation(LinearLayout.VERTICAL); 
     temp_inner_ver.setWeightSum(2); 
     temp_inner_ver.setPadding(7, 7, 7, 7); 
     inner_ver.add(temp_inner_ver); 
     } 

for(int j = 0 ; j < inner_ver.size() ; j++){ 
    // the LinearLayout declaration 
    inner_ver.get(j).addView(icon1); 
    icon1.setLayoutParams(lp_icon); 
    icon1.setBackgroundResource(R.drawable.ac_overlay); 
    icon1.setOrientation(LinearLayout.HORIZONTAL); 
    icon1.setTag(NORMAL); 

    // the elements declaration 
    TextView text1 = new TextView(this); 
    icon1.addView(text1); 
    text1.setLayoutParams(text_name); 
    text1.setText("something"); 
    text1.setTextSize(12); 
    text1.setTextColor(Color.WHITE); 

    ImageButton image = new ImageButton(this); 
    icon1.addView(image); 
    image.setLayoutParams(lp_ineer_ver); 
    image.setImageResource(R.drawable.grpbuttonfocus6); 
    image.setBackgroundColor(Color.TRANSPARENT); 

    Button testbut = new Button(this); 
    icon1.addView(testbut); 
    testbut.setLayoutParams(lp_ineer_ver); 
    testbut.setText(" 8"); 
    testbut.setTextSize(12); 
    testbut.setBackgroundColor(Color.TRANSPARENT); 
    testbut.setTextColor(Color.WHITE); 

    ImageButton testcol = new ImageButton(this); 
    icon1.addView(testcol); 
    testcol.setLayoutParams(lp_ineer_ver); 
    testcol.setImageResource(R.drawable.home_cool); 
    testcol.setBackgroundColor(Color.TRANSPARENT); 

    TextView text2 = new TextView(this); 
    icon1.addView(text2); 
    text2.setLayoutParams(lp_ineer_ver); 
    text2.setText("00"); 
    text2.setTextSize(12); 

    assignListener(icon1); 

} 

public void assignListener(final LinearLayout l) { 

l.getChildAt(1).setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        l.getChildAt(1).setBackgroundResource(R.drawable.home_grpbuttonfocus10);// this Line Getting a NullPointerException 
       } 
      }); 
     }

，並像下面這樣做時，它工作正常：

public void assignListener(final LinearLayout l) { 
    l.setOnClickListener(new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         l.setBackgroundResource(R.drawable.home_grpbuttonfocus10); 
        } 
       }); 
      }

的logcat的視圖： （它給我在上面的代碼中所示的線一NullPointerException）

01-14 12:22:06.308: INFO/ActivityManager(93): START {flg=0x4000000 cmp=com.example.solaceap/.HomeView (has extras)} from pid 602 
01-14 12:22:06.308: WARN/WindowManager(93): Failure taking screenshot for (222x135) to layer 21015 
01-14 12:22:06.625: DEBUG/dalvikvm(602): GC_FOR_ALLOC freed 11K, 3% free 11649K/11975K, paused 86ms 
01-14 12:22:06.995: DEBUG/AndroidRuntime(602): Shutting down VM 
01-14 12:22:06.995: WARN/dalvikvm(602): threadid=1: thread exiting with uncaught exception (group=0x409961f8) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602): FATAL EXCEPTION: main 
01-14 12:22:07.047: ERROR/AndroidRuntime(602): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.solaceap/com.example.solaceap.HomeView}: java.lang.NullPointerException 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.app.ActivityThread.access$600(ActivityThread.java:122) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.os.Handler.dispatchMessage(Handler.java:99) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.os.Looper.loop(Looper.java:137) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.app.ActivityThread.main(ActivityThread.java:4340) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at java.lang.reflect.Method.invoke(Method.java:511) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at dalvik.system.NativeStart.main(Native Method) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602): Caused by: java.lang.NullPointerException 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at com.example.solaceap.HomeView.assignListener(HomeView.java:669) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at com.example.solaceap.HomeView.setRooms(HomeView.java:518) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at com.example.solaceap.HomeView.setAllRooms(HomeView.java:359) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at com.example.solaceap.HomeView.declare_dynamics(HomeView.java:307) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at com.example.solaceap.HomeView.declare(HomeView.java:62) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at com.example.solaceap.HomeView.onCreate(HomeView.java:45) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.app.Activity.performCreate(Activity.java:4465) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) 
01-14 12:22:07.047: ERROR/AndroidRuntime(602):  ... 11 more

來源

2014-01-14 MRefaat

「Android應用程序崩潰」暗示，你應該運行'亞行logcat'並張貼在這裏的堆棧跟蹤的相關部分。 – keyboardsurfer

代碼在哪裏，你附加的，LinearLayout到ParentView –

'adb logcat'包括「由......引起」，如果有的話 – 18446744073709551615

的最簡單的解決辦法是直接設置偵聽到視圖，而不是去超過父母。

我不確定我是否能看到正確的視圖，但應該調用assignListener(image);（它應該是icon1佈局中的子項1）。

不僅僅是使用的第二個版本的assignListener()您已發佈：

public void assignListener(final ImageView imageView) { // changed type 
    imageView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      v.setBackgroundResource(R.drawable.home_grpbuttonfocus10); 
     } 
    }); 
}

來源

2014-01-14 10:36:48 WarrenFaith

的Android應用程序崩潰，而該分配onClickListener

回答

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