Android检测网络是否正常

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[align=left]按照惯例，先上图后代码[/align]



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[align=left]在实际开发中，尤其是在网络应用开发中，时常要判断网络是否处在联网状态，以及给用户友好的提示，由于需要在每个界面中有需要对其进行检测，所以我们把它封转成一个方法，让每个activity公用。[/align]

[align=left]首先是工具类[/align]

Java代码

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.widget.Toast;

public class CheckHttpUtil {

public static boolean isNetworkAvailable(Activity mActivity){
Context context = mActivity.getApplicationContext();

ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(
Context.CONNECTIVITY_SERVICE);

if(connectivity == null){
return false;
}else {
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 static void checkhttp(final Activity activity){
if(!isNetworkAvailable(activity)){
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle("网络错误，请检查网络设置");
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
activity.finish();
}
});
builder.show();
}else {
//这儿主要是用来测试的，实际中没有必要...
Toast.makeText(activity, "网络正常", Toast.LENGTH_LONG).show();
}
}
}

[align=left]然后是需要检测的activity[/align]

Java代码

public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
CheckHttpUtil.checkhttp(this);
}
}

注意需要添加权限<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>