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POandroid wifi state change causes app crashed
 

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  1. POandroid wifi state change causes app crashed
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    <p>Considering my this <a href="https://stackoverflow.com/questions/20394491/pressing-home-button-and-access-app-again-from-app-icon-call-oncreate">Previous question</a> question , i am still unable to find that, why wifi state change causes app crashed, getting back from launcher while my app was onreume state, it changes on resume to oncreate, and app get crashed, i tried to save an id in sharedPref at onstop of my 2nd activity, but still crashed..<br> Here is logcat : </p> <pre><code>12-05 17:14:39.966: E/AndroidRuntime(29449): FATAL EXCEPTION: main 12-05 17:14:39.966: E/AndroidRuntime(29449): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Pakagename/com.Pakagename.subCategories.SubCategoriesActivity}: java.lang.NullPointerException 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2205) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2240) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.app.ActivityThread.access$600(ActivityThread.java:139) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.os.Handler.dispatchMessage(Handler.java:99) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.os.Looper.loop(Looper.java:156) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.app.ActivityThread.main(ActivityThread.java:4977) 12-05 17:14:39.966: E/AndroidRuntime(29449): at java.lang.reflect.Method.invokeNative(Native Method) 12-05 17:14:39.966: E/AndroidRuntime(29449): at java.lang.reflect.Method.invoke(Method.java:511) 12-05 17:14:39.966: E/AndroidRuntime(29449): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 12-05 17:14:39.966: E/AndroidRuntime(29449): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 12-05 17:14:39.966: E/AndroidRuntime(29449): at dalvik.system.NativeStart.main(Native Method) 12-05 17:14:39.966: E/AndroidRuntime(29449): Caused by: java.lang.NullPointerException 12-05 17:14:39.966: E/AndroidRuntime(29449): at com.Pakagename.subCategories.SubCategoriesActivity.getSubCategories(SubCategoriesActivity.java:119) 12-05 17:14:39.966: E/AndroidRuntime(29449): at com.Pakagename.subCategories.SubCategoriesActivity.onCreate(SubCategoriesActivity.java:90) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.app.Activity.performCreate(Activity.java:4538) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071) 12-05 17:14:39.966: E/AndroidRuntime(29449): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161) 12-05 17:14:39.966: E/AndroidRuntime(29449): ... 11 more 12-05 17:14:39.976: E/EmbeddedLogger(1627): App crashed! Process: com.Pakagename 12-05 17:14:39.976: E/EmbeddedLogger(1627): App crashed! Package: com.Pakagename v2 (1.0) </code></pre> <p>here is what i am doing in oncreate of subcategoryActivity </p> <pre><code>if(getIntent().hasExtra("categoryid")) { if(getIntent().getStringExtra("categoryid") != null) { categoryId = Integer.parseInt(getIntent().getStringExtra("categoryid")); getSubCategories(categoryId); } } else { getSubCategories(categoryIdFromPref); // getting an id from pref, that iam saving in onstop } </code></pre> <p>and getSubCategories method,</p> <pre><code>private void getSubCategories(int categoryId) { if(categoryId!=0) { query = "SELECT * FROM sub_categories WHERE category_id = "+categoryId+" AND is_archived = 0"; Log.d("subCategory query", query); c = MainActivity.db.rawQuery(query, null); c.moveToFirst(); } } </code></pre> <p>logcat take me to this line after i check,</p> <pre><code>c = MainActivity.db.rawQuery(query, null); </code></pre> <p>and my manifest look like, </p> <pre><code> &lt;uses-permission android:name="com.android.vending.BILLING" /&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; &lt;uses-permission android:name="android.permission.READ_PHONE_STATE" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /&gt; &lt;uses-permission android:name="android.permission.WAKE_LOCK" /&gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" /&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" &lt;activity android:name="com.Pakagename.MainActivity" android:label="@string/app_name" android:screenOrientation="portrait" &gt; &lt;/activity&gt; &lt;activity android:name="com.Pakagename.SplashScreenActivity" android:parentActivityName="com.Pakagename.MainActivity" android:screenOrientation="portrait" android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;meta-data android:name="android.support.PARENT_ACTIVITY" android:screenOrientation="portrait" android:value="com.Pakagename.MainActivity" /&gt; &lt;/activity&gt; &lt;activity android:name="com.Pakagename.subCategories.SubCategoriesActivity" android:screenOrientation="portrait" &lt;/activity&gt; </code></pre>
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    1. USIrfan Ahmed
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    1. COPost your code and manifest file.
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      1. POandroid wifi state change causes app crashed
      1. USSiddharth_Vyas
    2. COplease see the link i attached of previous question
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      1. POandroid wifi state change causes app crashed
      1. USIrfan Ahmed
    3. COEspecially, show the method getSubCategories() inside the SubCategoriesActivity.
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      1. POandroid wifi state change causes app crashed
      1. USJeffrey Klardie
 

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