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1 package com.lixu.getInternet; 2 3 import android.app.Activity; 4 import android.content.Context; 5 import android.net.ConnectivityManager; 6 import android.net.NetworkInfo; 7 import android.os.Bundle; 8 import android.widget.Toast; 9 10 public class MainActivity extends Activity {11 12 @Override13 protected void onCreate(Bundle savedInstanceState) {14 super.onCreate(savedInstanceState);15 setContentView(R.layout.activity_main);16 17 boolean b = isConnect(this);18 19 if (b == true)20 Toast.makeText(this, "您的手机已经联网!", Toast.LENGTH_LONG).show();21 22 else if (b == false)23 Toast.makeText(this, "您的手机没有联网!", Toast.LENGTH_LONG).show();24 25 }26 27 public boolean isConnect(Context context) {28 ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);29 if (cm != null) {30 NetworkInfo info = cm.getActiveNetworkInfo();31 if (info != null && info.isConnected()) {32 if (info.getState() == NetworkInfo.State.CONNECTED) {33 return true;34 }35 }36 }37 return false;38 }39 40 }
运行效果:
原标题:小记:判断设备是否联网!
关键词: