Android判断手机是否联网及自动跳转功能(收藏版)

package com.example.amusic.welcome;import android.content.Intent;import android.content.IntentFilter;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import com.example.amusic.monitor.NetworkChangeReceiver;import com.example.amusic.R;import java.util.Timer;import java.util.TimerTask;public class welcome extends AppCompatActivity {  private final int SKIP_DELAY_TIME = 1200;  private NetworkChangeReceiver networkChangeReceiver;  private IntentFilter intentFilter;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_welcome);    //手机网络检测    intentFilter = new IntentFilter();    intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");    networkChangeReceiver = new NetworkChangeReceiver();    registerReceiver ( networkChangeReceiver, intentFilter);    Timer time = new Timer();    TimerTask task = new TimerTask(){      @Override      public void run() {        startActivity(new Intent(welcome.this,Login_Activity.class));        finish();        //onDestroy();      }    };    time.schedule(task, SKIP_DELAY_TIME);  }  protected void onDestroy(){    super.onDestroy();    unregisterReceiver( networkChangeReceiver);  }}// An highlighted blockvar foo = 'bar';public class NetworkChangeReceiver extends BroadcastReceiver {  @Override  public void onReceive(Context context, Intent intent) {    ConnectivityManager connectivityManager = (ConnectivityManager)        context.getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();    if (networkInfo!= null&&networkInfo.isAvailable()) {      Toast.makeText(context, "手机网络已开启！", Toast.LENGTH_SHORT).show();    } else {      Toast.makeText(context, "手机网络未开启！", Toast.LENGTH_SHORT).show();    }  }}// An highlighted blockvar foo = 'bar';