从后台返回后无法启动活动

时间：2012-06-15 23:09:37

标签： android fragment layout-inflater

我的应用程序在最初运行时有效，但是如果它在后台停留一段时间然后由用户重新启动我得到一个RuntimeException“无法启动活动ComponentInfo ...错误膨胀类片段”。

活动包含一个包含ListView的片段。 ListView有一个包含ImageView和两个TextView的自定义适配器。

在应用程序处于后台并且使用了许多其他应用程序后返回活动时会抛出错误，这导致我相信它的内存问题，因为仅在我的设备上才会出现仿真器。

如何让我的应用程序避免此异常？

这是我在后台很长一段时间后恢复应用程序后的LogCat：

06-15 18:48:41.886: E/AndroidRuntime(10033): FATAL EXCEPTION: main
06-15 18:48:41.886: E/AndroidRuntime(10033): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.scl.tntmg/com.scl.tntmg.NowShowingActivity}: android.view.InflateException: Binary XML file line #9: Error inflating class fragment
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.os.Looper.loop(Looper.java:137)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.ActivityThread.main(ActivityThread.java:4424)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at java.lang.reflect.Method.invokeNative(Native Method)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at java.lang.reflect.Method.invoke(Method.java:511)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at dalvik.system.NativeStart.main(Native Method)
06-15 18:48:41.886: E/AndroidRuntime(10033): Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class fragment
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.Activity.setContentView(Activity.java:1835)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at com.scl.tntmg.NowShowingActivity.onCreate(NowShowingActivity.java:16)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.Activity.performCreate(Activity.java:4465)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
06-15 18:48:41.886: E/AndroidRuntime(10033):    ... 11 more
06-15 18:48:41.886: E/AndroidRuntime(10033): Caused by: android.os.NetworkOnMainThreadException
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at java.net.InetAddress.getAllByName(InetAddress.java:220)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:71)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpEngine.connect(HttpEngine.java:303)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at com.scl.tntmg.util.MovieGuideUtil.getData(MovieGuideUtil.java:118)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at com.scl.tntmg.util.MovieGuideUtil.refreshMovies(MovieGuideUtil.java:183)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at com.scl.tntmg.util.MovieGuideUtil.getMovies(MovieGuideUtil.java:82)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at com.scl.tntmg.ListFrag.onCreateView(ListFrag.java:49)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:845)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1058)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:289)
06-15 18:48:41.886: E/AndroidRuntime(10033):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:669)
06-15 18:48:41.886: E/AndroidRuntime(10033):    ... 21 more

以下是活动：

public class NowShowingActivity extends FragmentActivity{

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.nowshowing);

    removeNotifications();
}

public void onRestart(){
    super.onRestart();
}

public void onStop(){
    super.onStop();
}

public void onDestroy(){
    super.onDestroy();
}

public void onResume(){
    super.onResume();
    removeNotifications();
}

private void removeNotifications(){
    String ns = Context.NOTIFICATION_SERVICE;
    NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
    mNotificationManager.cancel(1);
}

public boolean onCreateOptionsMenu(Menu menu){
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.mgoptions,menu);
    return true;
}

public boolean onOptionsItemSelected(MenuItem item){
    Intent myIntent;
    switch(item.getItemId()){
        case R.id.theater_details:
            myIntent = new Intent(this, TheaterActivity.class);
            this.startActivity(myIntent);
            return true;
        case R.id.refresh:
            myIntent = new Intent(this, HomeActivity.class);
            this.startActivity(myIntent);
            return true;
        case R.id.about:
            myIntent = new Intent(this, AboutActivity.class);
            this.startActivity(myIntent);
            return true;
        case R.id.settings:
            myIntent = new Intent(this, SettingActivity.class);
            this.startActivity(myIntent);
            return true;
        default:
            return super.onOptionsItemSelected(item);   
    }
}

这是nowshowing布局：

<?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="horizontal" >



<fragment class="com.scl.tntmg.ListFrag"
        android:id="@+id/list"
        android:layout_weight="1"
        android:layout_width="0dp" android:layout_height="fill_parent" >
    <!-- Preview: layout=@layout/list -->
</fragment>

</LinearLayout>

2 个答案:

答案 0 :(得分：2)

您的堆栈跟踪说

Caused by: android.os.NetworkOnMainThreadException

这意味着可能是第一次，您在正确的线程中访问网络，但在第二次恢复后，从UI线程访问网络，如下所示：

at com.scl.tntmg.util.MovieGuideUtil.getData(MovieGuideUtil.java:118)

答案 1 :(得分：0)

正如你所说这将是一个内存问题，当你的应用程序失去焦点时，android可能会或可能不会（取决于资源的可用性）释放你的应用程序使用的内存。因此，您应该在onPause（）函数中保存活动状态，然后可以在onResume（）函数中恢复它。

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