（求助）无法恢复活动仅在nexus 7 4.4.2

解决！我使用三种不同的手机和平板电脑布局，我忘记了更改平板电脑的布局！ TextView不存在！ TNX的帮助！（求助）无法恢复活动仅在nexus 7 4.4.2

我的应用程序出现了一个奇怪的问题！它可以在所有设备上完美运行（avd 2.3.3，avd 4.4.2，avd 4.1.2 ecc ..）和真实设备，如Android 4.1 Android 2.3.3 - 2.3.7 Android 4.0.3 - 4.0.4 Android 4.2 Android 4.3的Android 4.4系统的Android 2.2的Android 3.2的Android 2.1的Android 3.1但它给我下面的错误只在谷歌Nexus 7 4.4.2

04-15 15:50:16.676: E/AndroidRuntime(24520): FATAL EXCEPTION: main 
04-15 15:50:16.676: E/AndroidRuntime(24520): Process: dado.auto3gdataswitch, PID: 24520 
04-15 15:50:16.676: E/AndroidRuntime(24520): java.lang.RuntimeException: Unable to resume activity {dado.auto3gdataswitch/dado.auto3gdataswitch.MainActivity}: java.lang.NullPointerException 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2788) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2817) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2250) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.ActivityThread.access$800(ActivityThread.java:135) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.os.Handler.dispatchMessage(Handler.java:102) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.os.Looper.loop(Looper.java:136) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.ActivityThread.main(ActivityThread.java:5017) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at java.lang.reflect.Method.invokeNative(Native Method) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at java.lang.reflect.Method.invoke(Method.java:515) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at dalvik.system.NativeStart.main(Native Method) 
04-15 15:50:16.676: E/AndroidRuntime(24520): Caused by: java.lang.NullPointerException 
04-15 15:50:16.676: E/AndroidRuntime(24520): at dado.auto3gdataswitch.MainActivity.onResume(MainActivity.java:112) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1192) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.Activity.performResume(Activity.java:5310) 
04-15 15:50:16.676: E/AndroidRuntime(24520): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2778) 
04-15 15:50:16.676: E/AndroidRuntime(24520): ... 12 more

我的活动：

import android.app.Activity; 
import android.content.ComponentName; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.pm.PackageManager; 
import android.net.ConnectivityManager; 
import android.net.wifi.WifiManager; 
import android.os.Bundle; 
import android.preference.PreferenceManager; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.Toast; 

public class MainActivity extends Activity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    final PackageManager pm = getPackageManager(); 
    final ComponentName compName = new  ComponentName(getApplicationContext(),NetworkReceiver.class); 
    final Button button = (Button) findViewById(R.id.button1); 
    final ConnectivityManager conman =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); 
    final WifiManager wifiManager = (WifiManager)  this.getSystemService(Context.WIFI_SERVICE); 
    int isEnabled = pm.getComponentEnabledSetting(compName); 


    if (isEnabled == PackageManager.COMPONENT_ENABLED_STATE_DISABLED) { 
     Toast.makeText(MainActivity.this, R.string.broadcastStop,  Toast.LENGTH_SHORT).show(); 
     button.setText(R.string.btEnable); 
    } 
    else { 

     wifiManager.setWifiEnabled(true); 
     Intent i = new Intent(getBaseContext(), MainService.class); 
     startService(i); 
     Toast.makeText(MainActivity.this, R.string.broadcastRun, Toast.LENGTH_SHORT).show(); 
     button.setText(R.string.btDisable); 
    } 

    button.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 

      int isEnabled = pm.getComponentEnabledSetting(compName); 
      if (isEnabled == PackageManager.COMPONENT_ENABLED_STATE_DISABLED) { 

       wifiManager.setWifiEnabled(true); 
       Intent i = new Intent(getBaseContext(), MainService.class); 
       startService(i); 
       pm.setComponentEnabledSetting(compName,PackageManager.COMPONENT_ENABLED_STATE_ENABLED,PackageManager.DONT_KILL_APP); 
       Toast.makeText(MainActivity.this, R.string.broadcastRun, Toast.LENGTH_SHORT).show(); 
       button.setText(R.string.btDisable); 
      } 
      else { 

       pm.setComponentEnabledSetting(compName,PackageManager.COMPONENT_ENABLED_STATE_DISABLED,PackageManager.DONT_KILL_APP); 
       Toast.makeText(MainActivity.this, R.string.broadcastStop, Toast.LENGTH_SHORT).show(); 
       button.setText(R.string.btEnable); 
      } 
     } 
    }); 

    } 

@Override 
protected void onResume() { 
    // TODO Auto-generated method stub 
    super.onResume(); 

    final TextView vibration = (TextView) findViewById(R.id.getVibro); 
    final TextView sound = (TextView) findViewById(R.id.getSound); 

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); 

    if (prefs.getBoolean(PreferencesActivity.SOUND, false)) { 
     sound.setText(getString(R.string.soundOn)); 
    } 
    else { 
     sound.setText("BLABLA");<<ERROR HERE 
    } 
    if (prefs.getBoolean(PreferencesActivity.VIBRO, false)) { 
     vibration.setText(getString(R.string.vibroOn)); 
    } 
    else { 
     vibration.setText(getString(R.string.vibroOff)); 
    } 
}

来源

2014-04-15 TecnoHelp83

你行号有一个NullPointerException在MainActivity.java后113. –

只需尝试不加修饰符即可，例如'TextView sound =（TextView）findViewById（R.id.getSound）;'。同时检查带有'getSound'的textview是否在'main.xml'中。 –

把它放在试试看，你会得到错误的原因 –

这一行：

sound.setText(R.string.soundOff);

应该是：

sound.setText(getString(R.string.soundOff));

编辑：下同几行。你能看到的空指针在logcat的情况，请转到该行，看看可能是错的有

编辑2：这行告诉你在哪里问题是：

Caused by: java.lang.NullPointerException 
    at dado.auto3gdataswitch.MainActivity.onResume(MainActivity.java:113)

来源

2014-04-15 12:51:07

更正所有行，但我在同一行中有相同的错误！在setText行有 – TecnoHelp83

？粘贴更新的代码的外观以及nullpointers发生的位置 –

已编辑！当我双击红线零点，其中错误在这里！ – TecnoHelp83

刚刚尝试没有修改最终即

TextView sound = (TextView) findViewById(R.id.getSound)

同时检查ID为getSound的textview是否在main.xml。

如果错误仍然存在，请执行下列操作变化 - -

取下onResume()以下行，并把它们onCreate()setContentView(R.layout.main);

public class MainActivity extends Activity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    final TextView vibration = (TextView) findViewById(R.id.getVibro); 
    final TextView sound = (TextView) findViewById(R.id.getSound); 
    //Rest of the code 
}

来源

2014-04-15 14:08:33

（求助）无法恢复活动仅在nexus 7 4.4.2

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