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前面我们已经编写程序,来判断网络连接状况, 今天我们在那个程序基础上,补充网络状态检测, 可以检测到时那个类型的网络连接.
同时我们添加了, 网络状态变化监听功能,在网络状况发生变化时, 可以快速发现网络状态的变化.这样可以通知我们的程序进行相关的处理工作.
下面是几个状态检测情况的显示
在发送任何HTTP请求前最好检查下网络连接状态,这样可以避免异常。这个教程将会介绍怎样在你的应用中检测网络连接状态。
创建新的项目
1.在Eclipse IDE中创建一个新的项目并把填入必须的信息。 File->New->Android Project
创建完项目结构如下:
2.创建新项目后的第一步是要在AndroidManifest.xml文件中添加必要的权限。
为了访问网络我们需要 INTERNET 权限
为了检查网络状态我们需要 ACCESS_NETWORK_STATE 权限
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.iigrowing.android.network.connection.info"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="9" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name="cn.iigrowing.android.network.connection.info.InternetConnectionActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
</manifest>
main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Detect Internet Status" />
<Button
android:id="@+id/btn_check"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Check Internet Status" />
</RelativeLayout>
网络连接状态检测类
ConnectionDetector.java
/*
* Copyright (C) 2010 network authors
*
* @author shao
*
* @date 2013.9.21
*
* @blog http://www.iigrowing.cn/
*
* 本程序是android客户端软件演示程序
*
*/
package cn.iigrowing.android.network.connection.info;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class ConnectionDetector {
private Context _context;
public ConnectionDetector(Context context) {
this._context = context;
}
public boolean isConnectingToInternet() {
ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
return false;
}
public boolean isNetworkConnected(Context context) {
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null) {
return mNetworkInfo.isAvailable();
}
}
return false;
}
public boolean isWifiConnected(Context context) {
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mWiFiNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (mWiFiNetworkInfo != null) {
return mWiFiNetworkInfo.isAvailable();
}
}
return false;
}
public boolean isMobileConnected(Context context) {
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mMobileNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (mMobileNetworkInfo != null) {
return mMobileNetworkInfo.isAvailable();
}
}
return false;
}
public static String getConnectedTypeInfo(Context context) {
StringBuilder sb=new StringBuilder();
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {
sb.append("\r\nDetailedState:" + mNetworkInfo.getDetailedState());
sb.append("\r\nExtraInfo:" + mNetworkInfo.getExtraInfo());
sb.append("\r\nReason:" + mNetworkInfo.getReason());
sb.append("\r\nState:" + mNetworkInfo.getState());
sb.append("\r\nSubtypeName:" + mNetworkInfo.getSubtypeName());
sb.append("\r\nSubtype:" + mNetworkInfo.getSubtype());
sb.append("\r\nTypeName:" + mNetworkInfo.getTypeName());
sb.append("\r\nType:" + mNetworkInfo.getType());
return sb.toString();
}
}
return "";
}
public static int getConnectedType(Context context) {
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {
return mNetworkInfo.getType();
}
}
return -1;
}
}
InternetConnectionActivity.java
/*
* Copyright (C) 2010 network authors
*
* @author shao
*
* @date 2013.9.21
*
* @blog http://www.iigrowing.cn/
*
* 本程序是android客户端软件演示程序
*
*/
package cn.iigrowing.android.network.connection.info;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class InternetConnectionActivity extends Activity {
// flag for Internet connection status
Boolean isInternetPresent = false;
// Connection detector class
ConnectionDetector cd;
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
if (connectionReceiver != null) {
unregisterReceiver(connectionReceiver);
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button btnStatus = (Button) findViewById(R.id.btn_check);
// ConnectivityManager.
// 注册一个 广播的接受者,来接受网络广播情况
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(connectionReceiver, intentFilter);
// creating connection detector class instance
cd = new ConnectionDetector(getApplicationContext());
/**
* Check Internet status button click event
* */
btnStatus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
StringBuilder sb = new StringBuilder();
// get Internet status
isInternetPresent = cd.isConnectingToInternet();
if (isInternetPresent) {
sb.append("连接到互联网\r\n");
} else {
sb.append("未 连接到 互联网\r\n");
}
boolean wifi = cd.isWifiConnected(InternetConnectionActivity.this);
if (wifi) {
sb.append("连接采用了 wifi\r\n");
} else {
sb.append("连接 没有采用 wifi\r\n");
}
boolean mobile = cd.isMobileConnected(InternetConnectionActivity.this);
if (mobile) {
sb.append("连接采用了 3g\r\n");
} else {
sb.append("连接 没有采用 3g\r\n");
}
int i = cd.getConnectedType(InternetConnectionActivity.this);
String info = cd.getConnectedTypeInfo(InternetConnectionActivity.this);
// check for Internet status
if (isInternetPresent) {
// Internet Connection is Present
// make HTTP requests
showAlertDialog(InternetConnectionActivity.this, "Internet Connection", "You have internet connection\r\n" + sb.toString() + "\r\n" + info,
true);
} else {
// Internet connection is not present
// Ask user to connect to Internet
showAlertDialog(InternetConnectionActivity.this, "No Internet Connection", "You don’t have internet connection.\r\n" + sb.toString()
+ "\r\n" + info, false);
}
}
});
}
public void showAlertDialog(Context context, String title, String message, Boolean status) {
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
// Setting Dialog Title
alertDialog.setTitle(title);
// Setting Dialog Message
alertDialog.setMessage(message);
// Setting alert dialog icon
alertDialog.setIcon((status) ? R.drawable.success : R.drawable.fail);
// Setting OK Button
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
// Showing Alert Message
alertDialog.show();
}
BroadcastReceiver connectionReceiver = new BroadcastReceiver() {
// 接受 网络状况发生变化情况
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connectMgr = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo mobNetInfo = connectMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
NetworkInfo wifiNetInfo = connectMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
String s = "";
if (!mobNetInfo.isConnected() && !wifiNetInfo.isConnected()) {
Log.i("aaa", "unconnect");
s = "未连接(unconnect)\r\n";
} else {
Log.i("aaa", "connect network");
s = "已连接(connect network)\r\n";
}
s = s + cd.getConnectedTypeInfo(InternetConnectionActivity.this);
showAlertDialog(InternetConnectionActivity.this, "Internet Connection", s, true);
}
};
}