از همه دوستان که من رو راهنمایی کردم واقعا ممنونم.
جناب dalmif ، من با توجه به اون چیز هایی که گفته بودید ، یه پروژه درست کردم ؛ اما نمیدونم چرا Error میده و از برنامه خارج میشه !!
NetworkChangeReceiver.java
package com.alireza.broadcastreceivertest;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.widget.Toast;
public class NetworkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
final ConnectivityManager connMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
final android.net.NetworkInfo wifi = connMgr
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
final android.net.NetworkInfo mobile = connMgr
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (wifi.isAvailable() || mobile.isAvailable()) {
if (isOnline(context)) {
Toast.makeText(context, "Network is available", Toast.LENGTH_SHORT).show();
}
}
}
public boolean isOnline(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERV ICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
return (netInfo != null && netInfo.isConnected());
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.alireza.broadcastreceivertest" >
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".NetworkChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
<action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
</intent-filter>
</receiver>
</application>
</manifest>
این هم روند اجرا :
http://p30up.ir/images/0nlvdj4i7hcawcuhps2c.gif
این هم LogCat :
05-29 10:36:55.282 1233-1233/com.alireza.broadcastreceivertest E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start receiver com.alireza.broadcastreceivertest.NetworkChangeRec eiver: java.lang.NullPointerException
at android.app.ActivityThread.handleReceiver(Activity Thread.java:2236)
at android.app.ActivityThread.access$1500(ActivityThr ead.java:130)
at android.app.ActivityThread$H.handleMessage(Activit yThread.java:1271)
at android.os.Handler.dispatchMessage(Handler.java:99 )
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.jav a:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCa ller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit .java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.alireza.broadcastreceivertest.NetworkChangeRec eiver.onReceive(NetworkChangeReceiver.java:23)
at android.app.ActivityThread.handleReceiver(Activity Thread.java:2229)
at android.app.ActivityThread.access$1500(ActivityThr ead.java:130)
at android.app.ActivityThread$H.handleMessage(Activit yThread.java:1271)
at android.os.Handler.dispatchMessage(Handler.java:99 )
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.jav a:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
خیلی ممنونم.