Android 判断网络连接

//封装一个判断网络的类
public class HttpNet {

public static boolean isNetConnected(Context context){

    boolean isNetConnected;

    //获得网络服务
    ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo info = manager.getActiveNetworkInfo();
    if (info != null && info.isAvailable()){
        isNetConnected = true;
    }else {
        isNetConnected = false;
    }
    return isNetConnected;
}

}

java代码:

public class MainActivity extends AppCompatActivity {

private ListView listView;
private String path = "http://www.xieast.com/api/news/news.php?page=";
private int count = 1;
private int i;
private ArrayList<User.Data> list;
private View button;

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

    //找控件
    listView = findViewById(R.id.listview);
    button = findViewById(R.id.button);

    //获取数据
    getData();

    //创建空集合
    list = new ArrayList<>();


    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(MainActivity.this, list.get(position).getTitle(),Toast.LENGTH_SHORT).show();
        }
    });

}

private void getData() {

    boolean flag = new HttpNet().isNetConnected(MainActivity.this);

    if (flag){
       button.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               i = count++;
               HttpUtils httpUtils = new HttpUtils();
               httpUtils.getPath(path + i);
               httpUtils.getstring(new HttpUtils.GetData() {

                   @Override
                   public void setstring(String s) {
                       Gson gson = new Gson();
                       User user = gson.fromJson(s, User.class);
                       list.addAll(user.getData());
                       //Toast.makeText(MainActivity.this, list.toString(),Toast.LENGTH_SHORT).show();
                       //设置适配器
                       listView.setAdapter(new MyAdapter(MainActivity.this,list));
                   }
               });
           }
       });
    }else {
        Toast.makeText(MainActivity.this,"亲,没网啦",Toast.LENGTH_SHORT).show();
    }
}

}