Android判断网络连接状态并自动界面跳转，android跳转,用于判断软件打开时的网络

Android判断网络连接状态并自动界面跳转，android跳转,用于判断软件打开时的网络

用于判断软件打开时的网络连接状态，若无网络连接，提醒用户跳转到设置界面```java /* * 设置在onStart()方法里面，可以在界面每次获得焦点的时候都进行检测 /

    @Override      protected void onStart() {          ConnectivityManager manager = (ConnectivityManager) this                  .getSystemService(Context.CONNECTIVITY_SERVICE);          NetworkInfo info = manager.getActiveNetworkInfo();          if (info != null && info.isConnected()) {              Toast.makeText(MainActivity.this, "网络连接连接", 0).show();          } else {              AlertDialog.Builder builder = new Builder(MainActivity.this);              builder.setTitle("开启网络服务");              builder.setMessage("网络没有连接，请到设置进行网络设置！");              builder.setPositiveButton("确定",                      new DialogInterface.OnClickListener() {                          public void onClick(DialogInterface dialog, int which) {                              if (android.os.Build.VERSION.SDK_INT > 10) {                                  // 3.0以上打开设置界面，也可以直接用ACTION_WIRELESS_SETTINGS打开到wifi界面                                  startActivity(new Intent(                                          android.provider.Settings.ACTION_SETTINGS));                              } else {                                  startActivity(new Intent(                                          android.provider.Settings.ACTION_WIRELESS_SETTINGS));                              }                              dialog.cancel();                          }                      });            builder.setNegativeButton("取消",                      new DialogInterface.OnClickListener() {                          @Override                          public void onClick(DialogInterface dialog, int which) {                              dialog.cancel();                          }                      });              builder.show();          }          super.onStart();      }

```需要注册的权限 <uses-permissionandroid:name="android.permission.ACCESS_NETWORK_STATE"/>