简易新闻客户端android
1.创建app\src\main\res\xml\network_security_config.xml
目的可以访问http请求
2.
修改AndroidManifest.xml
加:1.
2. android:networkSecurityConfig="@xml/network_security_config"> //可以访问http请求
3.
模型
package com.glsite.newsclient.domain;
/**
* 新闻信息实体bean
* @author glsite.com
* @version $Rev$
* @des ${TODO}
* @updateAuthor $Author$
* @updateDes ${TODO}
*/
public class NewsItem {
// 新闻标题
private String title;
// 新闻描述
private String desc;
// 图片路径
private String imagePath;
// 新闻类型
private String type;
// 新闻的评论数
private int commentCount;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getImagePath() {
return imagePath;
}
public void setImagePath(String imagePath) {
this.imagePath = imagePath;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getCommentCount() {
return commentCount;
}
public void setCommentCount(int commentCount) {
this.commentCount = commentCount;
}
@Override
public String toString() {
return "NewsItem{" +
"title='" + title + '\'' +
", desc='" + desc + '\'' +
", imagePath='" + imagePath + '\'' +
", type='" + type + '\'' +
", commentCount=" + commentCount +
'}';
}
}
4.设置一个网络图片并显示到控件
package com.glsite.newsclient.domain;
/**
* 新闻信息实体bean
* @author glsite.com
* @version $Rev$
* @des ${TODO}
* @updateAuthor $Author$
* @updateDes ${TODO}
*/
public class NewsItem {
// 新闻标题
private String title;
// 新闻描述
private String desc;
// 图片路径
private String imagePath;
// 新闻类型
private String type;
// 新闻的评论数
private int commentCount;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getImagePath() {
return imagePath;
}
public void setImagePath(String imagePath) {
this.imagePath = imagePath;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getCommentCount() {
return commentCount;
}
public void setCommentCount(int commentCount) {
this.commentCount = commentCount;
}
@Override
public String toString() {
return "NewsItem{" +
"title='" + title + '\'' +
", desc='" + desc + '\'' +
", imagePath='" + imagePath + '\'' +
", type='" + type + '\'' +
", commentCount=" + commentCount +
'}';
}
}
5.用来解析新闻的信息
package com.glsite.newsclient;
import android.text.TextUtils;
import android.util.Xml;
import com.glsite.newsclient.domain.NewsItem;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.InputStream;
import java.util.ArrayList;
/**
* 用来解析新闻的信息
*
* @author glsite.com
* @version $Rev$
* @des ${TODO}
* @updateAuthor $Author$
* @updateDes ${TODO}
*/
class NewsInfoParser {
public static ArrayList getAllNewsInfos(InputStream is) throws Exception {
ArrayList newsItems = null;
NewsItem newsItem = null;
// 1.获取xml文件的解析器
XmlPullParser parser = Xml.newPullParser();
// 2.初始化xml文件解析器
parser.setInput(is, "utf-8");
// 3.解析xml文件
int type = parser.getEventType();
while (type != XmlPullParser.END_DOCUMENT) {
switch (type) {
case XmlPullParser.START_TAG:
if ("channel".equals(parser.getName())) {
// 说明解析到了最根部的标签节点
newsItems = new ArrayList<>();
} else if ("item".equals(parser.getName())){
newsItem = new NewsItem();
} else if ("title".equals(parser.getName())){
newsItem.setTitle(parser.nextText());
} else if ("description".equals(parser.getName())){
newsItem.setDesc(parser.nextText());
} else if ("image".equals(parser.getName())){
newsItem.setImagePath(parser.nextText());
} else if ("type".equals(parser.getName())){
newsItem.setType(parser.nextText());
} else if ("comment".equals(parser.getName())){
String countstr = parser.nextText();
if (TextUtils.isDigitsOnly(countstr)) {//判断countstr是不是数字
newsItem.setCommentCount(Integer.parseInt(countstr));
}
}
break;
case XmlPullParser.END_TAG:
// 如果是走到了一个item的结束标签，说明一个item的数据已经准备好了，要添加到集合当中
if ("item".equals(parser.getName())) {
newsItems.add(newsItem);
}
break;
}
// 千万注意记得写这一句，否则就会死循环
type = parser.next();
}
return newsItems;
}
}
6.入口
package com.glsite.newsclient;
import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.glsite.newsclient.domain.NewsItem;
import com.glsite.newsclient.view.SmartImageView;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private static final int SHOW_NEWS = 1;
private static final int LOAD_ERROR = 2;
private LinearLayout mLLoading;
private ListView mLv;
private ArrayList mNewsItems;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
mLLoading.setVisibility(View.INVISIBLE);
switch (msg.what) {
case SHOW_NEWS:
Toast.makeText(MainActivity.this, "加载数据成功", Toast.LENGTH_SHORT).show();
mAdapter.notifyDataSetChanged();
break;
case LOAD_ERROR:
Toast.makeText(MainActivity.this, "获取数据失败", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
};
private MyNewsAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 开发步骤
// 1.初始化界面
// 2.获取新闻信息
// 3.解析新闻信息->解析为具体的实体对象
// 4.将实体对象显示到界面
initView();
loadNewsInfo();
}
/**
* 获取新闻信息
*/
private void loadNewsInfo() {
new Thread() {
@Override
public void run() {
try {
// Thread.sleep(50000);
URL url = new URL("http://192.168.1.130:8080/Day10/news.xml");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// 设置一个读取超时时间
conn.setReadTimeout(20000);
int code = conn.getResponseCode();
if (code == 200) {
// 请求成功
System.out.println("请求成功");
InputStream is = conn.getInputStream();
mNewsItems = NewsInfoParser.getAllNewsInfos(is);
// System.out.println(mNewsItems);
// 更新界面，把新闻显示到ui上
Message msg = Message.obtain();
msg.what = SHOW_NEWS;
mHandler.sendMessage(msg);
} else {
// 请求失败
System.out.println("请求失败");
Message msg = Message.obtain();
msg.what = LOAD_ERROR;
mHandler.sendMessage(msg);
}
} catch (Exception e) {
e.printStackTrace();
Message msg = Message.obtain();
msg.what = LOAD_ERROR;
mHandler.sendMessage(msg);
}
}
}.start();
}
/**
* 初始化界面
*/
private void initView() {
setContentView(R.layout.activity_main);
mLLoading = findViewById(R.id.ll_loading);
mLv = findViewById(R.id.lv_news);
mLLoading.setVisibility(View.VISIBLE);
mNewsItems = new ArrayList<>();
// for (int i = 0; i < 10; i++) {
// NewsItem item = new NewsItem();
// item.setTitle("苹果发布了新手机");
// item.setDesc("今天库克发布了新手机，引起了粉丝轰动");
// item.setImagePath("http://192.168.1.130:8080/Day10/img/a.jpg");
// item.setCommentCount(200);
// item.setType("3");
// mNewsItems.add(item);
// }
mAdapter = new MyNewsAdapter();
mLv.setAdapter(mAdapter);
}
private class MyNewsAdapter extends BaseAdapter {
@Override
public int getCount() {
return mNewsItems.size();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = View.inflate(MainActivity.this, R.layout.news_item, null);
// 千万要注意 view. 不写会空指针，因为不写是表示当前MainActivity的布局，当前布局是没有这些控件id资源的
SmartImageView iv = view.findViewById(R.id.iv_img);
TextView tv_title = view.findViewById(R.id.tv_title);
TextView tv_desc = view.findViewById(R.id.tv_desc);
TextView tv_type = view.findViewById(R.id.tv_type);
NewsItem item = getItem(position);
tv_title.setText(item.getTitle());
tv_desc.setText(item.getDesc());
String type = item.getType();
iv.setImageUrlAndShow(item.getImagePath());
if ("1".equals(type)) {
tv_type.setText("评论：" + item.getCommentCount());
tv_type.setBackgroundColor(Color.TRANSPARENT);
tv_type.setTextColor(Color.BLACK);
} else if ("2".equals(type)) {
tv_type.setText("专题");
tv_type.setBackgroundColor(Color.RED);
tv_type.setTextColor(Color.WHITE);
} else if ("3".equals(type)) {
tv_type.setText("直播");
tv_type.setBackgroundColor(Color.BLUE);
tv_type.setTextColor(Color.WHITE);
}
// 千万要注意!!! 不要返回null
return view;
}
@Override
public NewsItem getItem(int position) {
return mNewsItems.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
}
}
========================================================================================
2.newClient
AndroidManifest.xml
app\src\main\res\xml\ network_security_config.xml
activity_main.xml
news_item.xml
NewsClient\app\src\androidTest\java\com\glsite\newsclient\ExampleInstrumentedTest.java
package com.glsite.newsclient;
import android.content.Context;
import android.support.test.InstrumentationRegistry;
import android.support.test.runner.AndroidJUnit4;
import org.junit.Test;
import org.junit.runner.RunWith;
import static org.junit.Assert.*;
/**
* Instrumented test, which will execute on an Android device.
*
* @see Testing documentation
*/
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
@Test
public void useAppContext() {
// Context of the app under test.
Context appContext = InstrumentationRegistry.getTargetContext();
assertEquals("com.glsite.newsclient", appContext.getPackageName());
}
}
NewsClient\app\src\main\java\com\glsite\newsclient\domain\NewsItem.java
package com.glsite.newsclient.domain;
/**
* 新闻信息实体bean
* @author glsite.com
* @version $Rev$
* @des ${TODO}
* @updateAuthor $Author$
* @updateDes ${TODO}
*/
public class NewsItem {
// 新闻标题
private String title;
// 新闻描述
private String desc;
// 图片路径
private String imagePath;
// 新闻类型
private String type;
// 新闻的评论数
private int commentCount;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getImagePath() {
return imagePath;
}
public void setImagePath(String imagePath) {
this.imagePath = imagePath;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public int getCommentCount() {
return commentCount;
}
public void setCommentCount(int commentCount) {
this.commentCount = commentCount;
}
@Override
public String toString() {
return "NewsItem{" +
"title='" + title + '\'' +
", desc='" + desc + '\'' +
", imagePath='" + imagePath + '\'' +
", type='" + type + '\'' +
", commentCount=" + commentCount +
'}';
}
}
NewsClient\app\src\main\java\com\glsite\newsclient\view\SmartImageView.java
package com.glsite.newsclient.view;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.widget.ImageView;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
/**
* @author glsite.com
* @version $Rev$
* @des ${TODO}
* @updateAuthor $Author$
* @updateDes ${TODO}
*/
public class SmartImageView extends android.support.v7.widget.AppCompatImageView {
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
Bitmap bitmap = (Bitmap) msg.obj;
setImageBitmap(bitmap);
}
};
public SmartImageView(Context context) {
super(context);
}
public SmartImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SmartImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
/**
* 设置一个网络图片并显示到控件
* @param imagePath
*/
public void setImageUrlAndShow(final String imagePath) {
new Thread(){
@Override
public void run() {
try {
URL url = new URL(imagePath);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
InputStream is = conn.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(is);
Message msg = Message.obtain();
msg.what = 0;
msg.obj = bitmap;
mHandler.sendMessage(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
}
MainActivity
package com.glsite.newsclient;
import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.glsite.newsclient.domain.NewsItem;
import com.glsite.newsclient.view.SmartImageView;
import java.io.InputStream;
import java.lang.reflect.Type;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private static final int SHOW_NEWS = 1;
private static final int LOAD_ERROR = 2;
private LinearLayout mLLoading;
private ListView mLv;
private ArrayList mNewsItems;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
mLLoading.setVisibility(View.INVISIBLE);
switch (msg.what) {
case SHOW_NEWS:
Toast.makeText(MainActivity.this, "加载数据成功", Toast.LENGTH_SHORT).show();
mAdapter.notifyDataSetChanged();
break;
case LOAD_ERROR:
Toast.makeText(MainActivity.this, "获取数据失败", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
};
private MyNewsAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 开发步骤
// 1.初始化界面
// 2.获取新闻信息
// 3.解析新闻信息->解析为具体的实体对象
// 4.将实体对象显示到界面
initView();
loadNewsInfo();
}
/**
* 获取新闻信息
*/
private void loadNewsInfo() {
new Thread() {
@Override
public void run() {
try {
// Thread.sleep(50000);
URL url = new URL("http://192.168.1.130:8080/Day10/news.xml");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// 设置一个读取超时时间
conn.setReadTimeout(20000);
int code = conn.getResponseCode();
if (code == 200) {
// 请求成功
System.out.println("请求成功");
InputStream is = conn.getInputStream();
mNewsItems = NewsInfoParser.getAllNewsInfos(is);
// System.out.println(mNewsItems);
// 更新界面，把新闻显示到ui上
Message msg = Message.obtain();
msg.what = SHOW_NEWS;
mHandler.sendMessage(msg);
} else {
// 请求失败
System.out.println("请求失败");
Message msg = Message.obtain();
msg.what = LOAD_ERROR;
mHandler.sendMessage(msg);
}
} catch (Exception e) {
e.printStackTrace();
Message msg = Message.obtain();
msg.what = LOAD_ERROR;
mHandler.sendMessage(msg);
}
}
}.start();
}
/**
* 初始化界面
*/
private void initView() {
setContentView(R.layout.activity_main);
mLLoading = findViewById(R.id.ll_loading);
mLv = findViewById(R.id.lv_news);
mLLoading.setVisibility(View.VISIBLE);
mNewsItems = new ArrayList<>();
// for (int i = 0; i < 10; i++) {
// NewsItem item = new NewsItem();
// item.setTitle("苹果发布了新手机");
// item.setDesc("今天库克发布了新手机，引起了粉丝轰动");
// item.setImagePath("http://192.168.1.130:8080/Day10/img/a.jpg");
// item.setCommentCount(200);
// item.setType("3");
// mNewsItems.add(item);
// }
mAdapter = new MyNewsAdapter();
mLv.setAdapter(mAdapter);
}
private class MyNewsAdapter extends BaseAdapter {
@Override
public int getCount() {
return mNewsItems.size();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = View.inflate(MainActivity.this, R.layout.news_item, null);
// 千万要注意 view. 不写会空指针，因为不写是表示当前MainActivity的布局，当前布局是没有这些控件id资源的
SmartImageView iv = view.findViewById(R.id.iv_img);
TextView tv_title = view.findViewById(R.id.tv_title);
TextView tv_desc = view.findViewById(R.id.tv_desc);
TextView tv_type = view.findViewById(R.id.tv_type);
NewsItem item = getItem(position);
tv_title.setText(item.getTitle());
tv_desc.setText(item.getDesc());
String type = item.getType();
iv.setImageUrlAndShow(item.getImagePath());
if ("1".equals(type)) {
tv_type.setText("评论：" + item.getCommentCount());
tv_type.setBackgroundColor(Color.TRANSPARENT);
tv_type.setTextColor(Color.BLACK);
} else if ("2".equals(type)) {
tv_type.setText("专题");
tv_type.setBackgroundColor(Color.RED);
tv_type.setTextColor(Color.WHITE);
} else if ("3".equals(type)) {
tv_type.setText("直播");
tv_type.setBackgroundColor(Color.BLUE);
tv_type.setTextColor(Color.WHITE);
}
// 千万要注意!!! 不要返回null
return view;
}
@Override
public NewsItem getItem(int position) {
return mNewsItems.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
}
}
NewsInfoParser
package com.glsite.newsclient;
import android.text.TextUtils;
import android.util.Xml;
import com.glsite.newsclient.domain.NewsItem;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import java.io.InputStream;
import java.util.ArrayList;
/**
* 用来解析新闻的信息
*
* @author glsite.com
* @version $Rev$
* @des ${TODO}
* @updateAuthor $Author$
* @updateDes ${TODO}
*/
class NewsInfoParser {
public static ArrayList getAllNewsInfos(InputStream is) throws Exception {
ArrayList newsItems = null;
NewsItem newsItem = null;
// 1.获取xml文件的解析器
XmlPullParser parser = Xml.newPullParser();
// 2.初始化xml文件解析器
parser.setInput(is, "utf-8");
// 3.解析xml文件
int type = parser.getEventType();
while (type != XmlPullParser.END_DOCUMENT) {
switch (type) {
case XmlPullParser.START_TAG:
if ("channel".equals(parser.getName())) {
// 说明解析到了最根部的标签节点
newsItems = new ArrayList<>();
} else if ("item".equals(parser.getName())){
newsItem = new NewsItem();
} else if ("title".equals(parser.getName())){
newsItem.setTitle(parser.nextText());
} else if ("description".equals(parser.getName())){
newsItem.setDesc(parser.nextText());
} else if ("image".equals(parser.getName())){
newsItem.setImagePath(parser.nextText());
} else if ("type".equals(parser.getName())){
newsItem.setType(parser.nextText());
} else if ("comment".equals(parser.getName())){
String countstr = parser.nextText();
if (TextUtils.isDigitsOnly(countstr)) {
newsItem.setCommentCount(Integer.parseInt(countstr));
}
}
break;
case XmlPullParser.END_TAG:
// 如果是走到了一个item的结束标签，说明一个item的数据已经准备好了，要添加到集合当中
if ("item".equals(parser.getName())) {
newsItems.add(newsItem);
}
break;
}
// 千万注意记得写这一句，否则就会死循环
type = parser.next();
}
return newsItems;
}
}