Android通过广播判断网络连接（仿QQ网络连接显示）

效果图：

Android通过广播判断网络连接（仿QQ网络连接显示）_第1张图片

1、activity.xml布局

<?xml version="1.0" encoding="utf-8"?>

这里就简单的示例了一个textview提示

2、MainActivity.java

public class MainActivity extends AppCompatActivity {    private IntentFilter filter;    private Broad broad;    public TextView tv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv= (TextView) findViewById(R.id.tv);        filter =new IntentFilter();        broad=new Broad();        filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");        registerReceiver(broad,filter);        tv.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {               //点击提示文字时跳转设置界面                Intent intent =  new Intent(Settings.ACTION_SETTINGS);                startActivity(intent);            }        });    }    //广播接收器    class  Broad  extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {            ConnectivityManager connectivityManager= (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);            NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();           //判断网络状态            if(networkInfo!=null&&networkInfo.isAvailable()){                Log.i("TAG","网络状态"+networkInfo.isAvailable());                tv.setVisibility(View.GONE);            }else{                tv.setVisibility(View.VISIBLE);            }        }    }   //注册取消    @Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(broad);    }}

3、添加网络权限

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