这是我的Activity类加载图片。
package oerrride.we.huzykamz.newsfeed;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.GridView;
import android.widget.ProgressBar;
import android.widget.Toast;
import java.io.InputStream;
import java.net.URL;
import java.util.List;
public class MainActivity extends AppCompatActivity {
ProgressBar pb;
List<NewsModel> flowerList;
RecyclerView mRecycler;
NewsAdapter2 adapter;
List<MyTask> tasks;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pb =(ProgressBar) findViewById(R.id.progressBarNews);
mRecycler =(RecyclerView) findViewById(R.id.recycler_view_news);
mRecycler.setLayoutManager(new LinearLayoutManager(this));
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
final String url ="http://10.0.2.2/UgandaMedicalAccess/HealthCentreNews/fecth.php";
if(netInfo != null && netInfo.isConnectedOrConnecting()) {
new MyTask().execute(url);
}
else{
Toast.makeText(this,"No network connection! , please check your connectivity",Toast.LENGTH_LONG).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
protected void updateDisplay() {
adapter = new NewsAdapter2(MainActivity.this, flowerList);
mRecycler.setAdapter(adapter);
}
private class MyTask extends AsyncTask<String, String,List<NewsModel>> {
@Override
protected void onPreExecute() {
setProgressBarIndeterminateVisibility(true);
}
@Override
protected List<NewsModel> doInBackground(String... params) {
String content = HttpManager.getData(params[0], "feeduser", "feedpassword");
flowerList = NewsParser.parseFeed(content);
return flowerList;
}
@Override
protected void onPostExecute(List<NewsModel> newsModels) {
/* tasks.remove(this);
if (tasks.size() == 0) {
pb.setVisibility(View.INVISIBLE);
}
*/
pb.setVisibility(View.INVISIBLE);
if (newsModels == null) {
Toast.makeText(MainActivity.this, "Data is not available", Toast.LENGTH_LONG).show();
return;
}
flowerList = newsModels;
updateDisplay();
}
}
}
这是我的 HttpManager.java 类
package oerrride.we.huzykamz.newsfeed;
import android.util.Base64;
import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* Created by HUZY_KAMZ on 2/5/2016.
*/
public class HttpManager {
public static String ata(String uri) {
BufferedReader reader = null;
try {
URL url = new URL(uri);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
StringBuilder sb = new StringBuilder();
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}
}
public static String getData(String uri, String userName, String password) {
BufferedReader reader = null;
HttpURLConnection con = null;
byte[] loginBytes = (userName + ":" + password).getBytes();
StringBuilder loginBuilder = new StringBuilder()
.append("Basic ")
.append(Base64.encodeToString(loginBytes, Base64.DEFAULT));
try {
URL url = new URL(uri);
con = (HttpURLConnection) url.openConnection();
con.addRequestProperty("Authorization", loginBuilder.toString());
StringBuilder sb = new StringBuilder();
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
try {
int status = con.getResponseCode();
Log.d("HttpManager", "HTTP response code: " + status);
} catch (IOException e1) {
e1.printStackTrace();
}
return null;
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}
}}
我的 JSONParser 类
package oerrride.we.huzykamz.newsfeed;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
/**
* Created by HUZY_KAMZ on 2/7/2016.
*/
public class NewsParser {
public static List<NewsModel> parseFeed(String content) {
try {
JSONArray ar = new JSONArray(content);
List<NewsModel> flowerList = new ArrayList<>();
for (int i = 0; i < ar.length(); i++) {
JSONObject obj = ar.getJSONObject(i);
NewsModel healthc = new NewsModel();
healthc.setDetails(obj.getString("Details"));
healthc.setHeadlines(obj.getString("Headlines"));
healthc.setPhoto(obj.getString("photo"));
flowerList.add(healthc);
}
return flowerList;
} catch (JSONException e) {
e.printStackTrace();
return null;
}
}
}
这是我在RecyclerView中加载我的图片的方式。
@Override
public void onBindViewHolder(final NewsViewHolder holder,final int position) {
final NewsModel feedItems = itemList.get(position);
holder.root.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(NewsAdapter2.this.context, NewsInformation.class);
intent.putExtra(NewsViewHolder.KEY_HEADLINES, feedItems.getHeadlines());
intent.putExtra(NewsViewHolder.KEY_DETAILS, feedItems.getDetails());
context.startActivity(intent);
//Download image using picasso library
Picasso.with(context).load(url_load_images + feedItems.getPhoto())
.error(R.mipmap.ic_launcher).
resize(120, 50)
.placeholder(R.mipmap.ic_launcher).into(holder.newspic);
holder.headlines.setText(itemList.get(position).getHeadlines());
}
});}
点击ITEM后，JSON数据加上Image加载为什么会这样？
答案 0 :(得分：0)
基本上，
在使用imageurl加载图片之前，您必须获得picasso（没有更多解决方案），但您可以使用Gson来解析Stream（您正在使用直接并且需要在解析之前将流数据保存到字符串中，它会更快。
P / s不设置适配器，您应该使用notifyDatasetChagnge()刷新适配器。