使用广播监听网络状态-优快云博客

本文介绍了一种通过广播接收器监听Android设备网络状态变化的方法。具体实现包括动态注册广播、创建IntentFilter并设置对应的Action，以及如何根据网络类型显示提示信息。

使用广播进行网络判断

public class MainActivity extends AppCompatActivity{

private LinstenerNewWorkBroadcastReceiver broadcastReceiver;

       @Override
       protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          ThemeUtil.onActivityCreateSetTheme(this);
          setContentView(R.layout.activity_main);

          //动态注册广播,创建一个IntentFilter
          broadcastReceiver = new LinstenerNewWorkBroadcastReceiver();
          IntentFilter filter = new IntentFilter();
          filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

          //注册
          registerReceiver(broadcastReceiver, filter);

}

//接收网络状态的改变
    public class LinstenerNewWorkBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {

                //如果能走到这，说明网络已经发生变化
                ConnectivityManager connectivityManager = (ConnectivityManager)                              context.getSystemService(Context.CONNECTIVITY_SERVICE);
                NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
                if (activeNetworkInfo != null && activeNetworkInfo.isConnected()) {
                    if (ConnectivityManager.TYPE_WIFI == activeNetworkInfo.getType()) {

                        Toast.makeText(MainActivity.this, "wifi可用，下载吧", Toast.LENGTH_SHORT).show();
                    } else if (connectivityManager.TYPE_MOBILE == activeNetworkInfo.getType()) {

                        Toast.makeText(MainActivity.this, "现在是移动网络，当心", Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(MainActivity.this, "网络不可用，请检查网络", Toast.LENGTH_SHORT).show();
                    }
                } else {

                    showSettingNetWorkDialog();

                }

            }
        }
    }

    //网络设置对话框
    private void showSettingNetWorkDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("没有设置网络，请您设置网络！！！");
        builder.setPositiveButton("设置", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //跳转网络设置界面隐士意图
                Intent intent = new Intent();
                intent.setAction(Settings.ACTION_WIRELESS_SETTINGS);
                startActivity(intent);
            }
        });
        builder.setNegativeButton("取消", null);
        builder.create().show();
    }

    //销毁方式
    @Override
    protected void onDestroy() {
        super.onDestroy();
        //解注册
        unregisterReceiver(broadcastReceiver);
    }