使用用於測試的裝置 - 每當我鎖定屏幕(或1分鐘後空閒睡),應用程序崩潰和logcat
示出了NullPointerException
總是在onResume()
方法的imageView.setOnClickListener
。應用崩潰鎖定/睡眠屏幕上 - 的NullPointerException
下面的代碼的一小部分,我得到異常:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.critical_items_list);
// instantiate member variables
mExtras = getIntent().getExtras();
mItems_P1 = mExtras.getParcelableArrayList(EXTRA_ITEMS_P1);
mItems_P2 = mExtras.getParcelableArrayList(EXTRA_ITEMS_P2);
mItems_Engine = mExtras.getParcelableArrayList(EXTRA_ITEMS_ENGINE);
}
protected void onResume() {
super.onResume();
ImageView imageAddToMultiple = (ImageView) findViewById(R.id.image_add_to_multiple);
//This is where the I get the NullPointer
imageAddToMultiple.setOnClickListener(listenerAddToMultipleItems);
refreshLists();
ListView listP1 = (ListView) findViewById(R.id.list_p1);
ListView listP2 = (ListView) findViewById(R.id.list_p2);
ListView listEngine = (ListView) findViewById(R.id.list_engine);
listP1.setAdapter(new MyAdapter(mList_P1));
listP2.setAdapter(new MyAdapter(mList_P2));
listEngine.setAdapter(new MyAdapter(mList_Engine));
}
的ImageView的本身就在於一個RelativeLayout
:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="@dimen/standard_bar_height"
android:background="@color/green"
android:baselineAligned="false" >
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center" >
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:text="@string/plant_1"
android:textColor="@android:color/black" />
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center" >
<TextView
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:text="@string/plant_2"
android:textColor="@android:color/black" />
</LinearLayout>
<RelativeLayout
android:id="@+id/RelativeLayout1"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1" >
<ImageView
android:id="@+id/image_add_to_multiple"
android:layout_width="@dimen/standard_bar_height"
android:layout_height="@dimen/standard_bar_height"
android:layout_alignParentRight="true"
android:layout_centerHorizontal="true"
android:contentDescription="@string/description_add_to_multiple_items"
android:src="@android:drawable/ic_menu_add" />
<TextView
android:id="@+id/TextView1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:gravity="center"
android:text="@string/engine"
android:textColor="@android:color/black" />
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ListView
android:id="@+id/list_p1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >
</ListView>
<View
android:layout_width="2dp"
android:layout_height="fill_parent"
android:background="@color/green" />
<ListView
android:id="@+id/list_p2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >
</ListView>
<View
android:layout_width="2dp"
android:layout_height="fill_parent"
android:background="@color/green" />
<ListView
android:id="@+id/list_engine"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" >
</ListView>
</LinearLayout>
</LinearLayout>
我不知道爲什麼我會得到這NullPointer
。
致命異常:主 了java.lang.RuntimeException:無法恢復活動{nmw.nss/nmw.nss.CriticalList}:顯示java.lang.NullPointerException在 android.app.ActivityThread.performResumeActivity(ActivityThread。 Java的:2820) 在 android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2859) 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2242) 在android.app.ActivityThread.access $ 600(ActivityThread .java:139)at android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1262) at android.os.Hand ler.dispatchMessage(Handler.java:99)at android.os.Looper.loop(Looper.java:154)at android.app.ActivityThread.main(ActivityThread.java:4974)at java.lang.reflect。 Method.invokeNative(Native Method) java.lang.reflect.Method.invoke(Method.java:511)at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:784) at com .android.internal.os.ZygoteInit.main(ZygoteInit.java:551)at dalvik.system.NativeStart.main(Native Method)引起: java.lang.NullPointerException在 nmw.nss.CriticalList.onResume(CriticalList .java:93)
at android.a pp.Instrumentation.callActivityOnResume(Instrumentation.java:1236) 在android.app.Activity.performResume(Activity.java:4620)在 android.app.ActivityThread.performResumeActivity(ActivityThread.java:2804) ... 12更多
謝謝。
編輯:我已添加完整的活動(排序),xml
和logcat
。 我是否需要重寫Activity
方法中的任何一種,或許要使用onStop
或來使其工作?
粘貼logcat在這裏.. !!! –
但你在哪裏聲明瞭listview? – MAC
發送您的全部代碼 – user1208720