Question

嘿伙计我试图显示来自远程网址的json数据包含图片和文字，并希望以片段形式显示？任何人都可以发布示例代码或参考最好的一个教程。我已经谷歌搜索但找不到正确的解决方案，因为我正在寻找。

这是我的MainActivity

package com.androidbelieve.drawerwithswipetabs;

import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;

public class MainActivity extends AppCompatActivity{
    DrawerLayout mDrawerLayout;
    NavigationView mNavigationView;
    FragmentManager mFragmentManager;
    FragmentTransaction mFragmentTransaction;

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

        /**
         *Setup the DrawerLayout and NavigationView
         */

             mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
             mNavigationView = (NavigationView) findViewById(R.id.shitstuff) ;

        /**
         * Lets inflate the very first fragment
         * Here , we are inflating the TabFragment as the first Fragment
         */

             mFragmentManager = getSupportFragmentManager();
             mFragmentTransaction = mFragmentManager.beginTransaction();
             mFragmentTransaction.replace(R.id.containerView,new TabFragment()).commit();
        /**
         * Setup click events on the Navigation View Items.
         */

             mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
             @Override
             public boolean onNavigationItemSelected(MenuItem menuItem) {
                mDrawerLayout.closeDrawers();



                 if (menuItem.getItemId() == R.id.nav_item_sent) {
                     FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                     fragmentTransaction.replace(R.id.containerView,new SentFragment()).commit();

                 }

                if (menuItem.getItemId() == R.id.nav_item_inbox) {
                    FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
                    xfragmentTransaction.replace(R.id.containerView,new TabFragment()).commit();
                }

                 return false;
            }

        });

        /**
         * Setup Drawer Toggle of the Toolbar
         */

                android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar);
                ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, toolbar,R.string.app_name,
                R.string.app_name);

                mDrawerLayout.setDrawerListener(mDrawerToggle);

                mDrawerToggle.syncState();

    }
}

现在我想要显示PrimaryFragment Like;

package com.androidbelieve.drawerwithswipetabs;

import android.os.Bundle;
import android.view.View;
import android.support.v7.app.AppCompatActivity;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

import com.androidbelieve.drawerwithswipetabs.model.AndroidVersion;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class PrimaryFragment extends AppCompatActivity implements LoadJSONTask.Listener, AdapterView.OnItemClickListener {

    private ListView mListView;

    public static final String URL = "https://api.learn2crack.com/android/jsonandroid/";

    private List<HashMap<String, String>> mAndroidMapList = new ArrayList<>();

    private static final String KEY_VER = "ver";
    private static final String KEY_NAME = "name";
    private static final String KEY_API = "api";

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

        mListView = (ListView) findViewById(R.id.list_view);
        mListView.setOnItemClickListener(this);
        new LoadJSONTask(this).execute(URL);
    }

    @Override
    public void onLoaded(List<AndroidVersion> androidList) {

        for (AndroidVersion android : androidList) {

            HashMap<String, String> map = new HashMap<>();

            map.put(KEY_VER, android.getVer());
            map.put(KEY_NAME, android.getName());
            map.put(KEY_API, android.getApi());

            mAndroidMapList.add(map);
        }

        loadListView();
    }

    @Override
    public void onError() {

        Toast.makeText(this, "Error !", Toast.LENGTH_SHORT).show();
    }


    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

        Toast.makeText(this, mAndroidMapList.get(i).get(KEY_NAME),Toast.LENGTH_LONG).show();
    }

    private void loadListView() {

        ListAdapter adapter = new SimpleAdapter(PrimaryFragment.this, mAndroidMapList, R.layout.list_item,
                new String[] { KEY_VER, KEY_NAME, KEY_API },
                new int[] { R.id.version,R.id.name, R.id.api });

        mListView.setAdapter(adapter);

    }
}

Logcat是：

PrimaryFragment cannot be converted to Fragment

谢谢。

Answer 1

首先你需要异步获取数据，然后将日期从json解析为相应的对象，然后在各自的视图中显示它们，在获得json并解析它之后你必须异步下载图像你可以从here <中学习它/ p>

任何人都可以给我发一个例子，如何在片段列表视图中显示json url数据和图像？

1 个答案: