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POcommunication between two device using sms
 

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    <p>I want my program to be able to receive sms from a special number("+9856874236").</p> <p>I want application to be recive SMS ,if the SMS is contain "enable wifi" ,then change wifi to enable </p> <p>i 'm using this code but it working crash??</p> <p>MainActivity</p> <pre><code>package com.example.sms; import android.app.Activity; import android.content.Context; import android.net.wifi.WifiManager; import android.os.Bundle; import android.view.Menu; import android.widget.TextView; public class MainActivity extends Activity { static TextView messageBox; static String x=""; static Context context; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); messageBox=(TextView)findViewById(R.id.messageBox); check(); } //How to used other or many activity @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } public static void updateMessageBox(String msg,String from) { messageBox.append(msg); //Get parent phone number from database //check parent number with ... if(msg.equals("enable wifi")) { x="yes"; MainActivity objSampleClass = new MainActivity(); objSampleClass.check(); } //context.startActivity(new Intent(context, MainActivity.class)); //Intent i=new Intent(context, p1.class); //context.startActivity(i); } public void check() { if(x.equals("yes")) { WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); wifi.setWifiEnabled(true); } else { } } } </code></pre> <p>manifest</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.example.sms" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name="com.example.sms.MainActivity" android:label="@string/app_name" &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;/activity&gt; &lt;receiver android:name="com.example.sms.TextMessageReceiver" &gt; &lt;intent-filter&gt; &lt;action android:name="android.provider.Telephony.SMS_RECEIVED" /&gt; &lt;/intent-filter&gt; &lt;/receiver&gt; &lt;activity android:name="com.example.sms.Test" android:label="@string/title_activity_test" &gt; &lt;/activity&gt; &lt;/application&gt; &lt;uses-permission android:name="android.permission.RECEIVE_SMS" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_WIFI_STATE" &gt; &lt;/uses-permission&gt; &lt;uses-permission android:name="android.permission.BLUETOOTH"/&gt; &lt;uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/&gt; &lt;uses-permission android:name="android.permission.CHANGE_WIFI_STATE" &gt; &lt;/uses-permission&gt; &lt;/manifest&gt; </code></pre>
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