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POHow to Invoke/Start an application when a call is ended?
 

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  1. POHow to Invoke/Start an application when a call is ended?
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    <p>The code that I am presently using is as follows:</p> <p>My <strong>main class</strong></p> <pre><code> public class Index extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); telephonyManager.listen(new CustomPhoneStateListener(context), PhoneStateListener.LISTEN_CALL_STATE); } } </code></pre> <p>the <strong>CustomPhoneStateListener class</strong></p> <pre><code> public class CustomPhoneStateListener extends PhoneStateListener { public Activity activ=new Activity(){ public void startActivity(Intent i) {} }; Context context; public CustomPhoneStateListener(Context context) { super(); this.context = context; } @Override public void onCallStateChanged(int state, String incomingNumber) { super.onCallStateChanged(state, incomingNumber); switch (state) { case TelephonyManager.CALL_STATE_IDLE: Toast.makeText(context, "call has ended", Toast.LENGTH_SHORT).show(); // The process to transfer to the next application. Intent i = new Intent(Intent.ACTION_MAIN); PackageManager manager = activ.getPackageManager(); i = manager.getLaunchIntentForPackage("com.timetracker.app");// package name for my new app i.addCategory(Intent.CATEGORY_LAUNCHER); activ.startActivity(i); break; case TelephonyManager.CALL_STATE_OFFHOOK: Toast.makeText(context, "Phone call has taken", Toast.LENGTH_SHORT).show(); break; case TelephonyManager.CALL_STATE_RINGING: //when Ringing Toast.makeText(context, "Phone is ringing", Toast.LENGTH_SHORT).show(); break; default: break; } } } </code></pre> <p>and the Android Manifest file as:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.android.call" android:versionCode="1" android:versionName="1.0"&gt; &lt;uses-sdk android:minSdkVersion="8" /&gt; &lt;application android:icon="@drawable/icon" android:label="@string/app_name"&gt; &lt;receiver android:name=".Index" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.PHONE_STATE"/&gt; &lt;action android:name="android.view.InputMethod" /&gt; &lt;/intent-filter&gt; &lt;/receiver&gt; &lt;/application&gt; &lt;uses-permission android:name="android.permission.READ_PHONE_STATE" /&gt; &lt;uses-permission android:name="android.permission.CALL_PHONE"/&gt; &lt;/manifest&gt; </code></pre> <p>By using the above code I am able to get the toast message for the respective actions that I am performing ,but I am not able to give any <strong>Intent</strong> or by using the <strong>Package_Manger</strong> I am not able to shift to the next app.</p> <p>The log_cat message returned when trying to execute the code for invoking the app:</p> <pre><code> D/AndroidRuntime(312): Shutting down VM : W/dalvikvm(312): threadid=1: thread exiting with uncaught exception (group=0x4001d800) FATAL EXCEPTION: main E/AndroidRuntime(312): java.lang.NullPointerException E/AndroidRuntime(312): at android.content.ContextWrapper.getPackageManager(ContextWrapper.java:85) E/AndroidRuntime(312): at com.android.call.CustomPhoneStateListener.onCallStateChanged(CustomPhoneStateListener.java:39) E/AndroidRuntime(312): at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:319) E/AndroidRuntime(312): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime(312): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime(312): at android.app.ActivityThread.main(ActivityThread.java:4627) E/AndroidRuntime(312): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(312): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime(312): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) E/AndroidRuntime(312): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) E/AndroidRuntime(312): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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