多条目展示

public class MainActivity extends AppCompatActivity {

private ListView list_view;
private String spec="http://172.17.8.100/mobile/exam/findNewList";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    list_view = findViewById(R.id.list_view);
    jiexi(spec);
}

private void jiexi(String spec) {
    MyAsync myAsync = new MyAsync();
    myAsync.execute(spec);
}

public class MyAsync extends AsyncTask<String,Integer,String> {
    @Override
    protected String doInBackground(String... strings) {
        try {
            URL url = new URL(spec);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setReadTimeout(5000);
            connection.setConnectTimeout(5000);
            if (connection.getResponseCode()==200){
                String s=json2String(connection.getInputStream());
              return s;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String s) {
        Gson gson = new Gson();
       // Log.i("aaa","onPostExecute: "+s);
        Bean bean = gson.fromJson(s, Bean.class);
        final List<Bean.ResultBean.DataBean> data = bean.getResult().getData();
        list_view.setAdapter(new MyAdapter(MainActivity.this,data));

        //点击事件 
        list_view.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Intent intent = new Intent(MainActivity.this, WebActivity.class);
               intent.putExtra("pic",data.get(i).getUrl());
               startActivity(intent);
            }
        });
    }
        //转流方法
    private String json2String(InputStream inputStream) {
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            StringBuilder builder = new StringBuilder();
            String str=null;
            while ((str=reader.readLine())!=null){
                builder.append(str);
            }
            reader.close();
            return builder.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

}

强调内容
app 页面

//加 build gunle name:包.app
public class App extends Application {
private Context context;

@Override
public void onCreate() {
    super.onCreate();
    context=this;
    initData();
}

private void initData() {
    ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(context)
            .defaultDisplayImageOptions(options()).build();
    ImageLoader.getInstance().init(configuration);
}

private DisplayImageOptions options() {
    DisplayImageOptions displayImageOptions= new DisplayImageOptions.Builder()
            .cacheOnDisk(true)// 是否开启内存缓存
            .cacheInMemory(true)// 是否开启SD卡缓存
            .build();
    return displayImageOptions;
}

}