更新LisView里面的进度条，可用下载软件的进度显示

本文出自： http://www.cnblogs.com/jdsjlzx/archive/2011/08/01/2123974.html

今天看到论坛上有人问这个。估计是要搞一个类似下载软件的东西吧。

所以就有了本篇，原理：

处理线程先给handler发消息，消息中包括进度信息，handler在去更改List的Adapter里面的信息，并通知List更新UI。

原理很简单，就直接上码了：

001	package hol.test.listprogress;

002

003	import java.util.ArrayList;

004	import java.util.HashMap;

005	import java.util.List;

006

007	import android.app.Activity;

008	import android.content.Context;

009	import android.os.Bundle;

010	import android.os.Handler;

011	import android.os.Message;

012	import android.view.LayoutInflater;

013	import android.view.View;

014	import android.view.ViewGroup;

015	import android.widget.BaseAdapter;

016	import android.widget.Button;

017	import android.widget.ListView;

018	import android.widget.ProgressBar;

019	import android.widget.TextView;

020

021	public class TestListProgress extends Activity {

022	private Button testDo = null;

023	private ListView progressList = null;

024	private List<HashMap<String, Object>> list;

025	private MyAdapter myAdapet;

026	private MyHandler myHandler;

027

028

@Override

029	public void onCreate(Bundle savedInstanceState) {

030	super.onCreate(savedInstanceState);

031	setContentView(R.layout.main);

032

033	myHandler = new MyHandler();

034

035	findView();

036	addListerner();

037	initList();

038

}

039

040	private void findView() {

041	testDo = (Button) findViewById(R.id.btn_test);

042	progressList = (ListView) findViewById(R.id.lst_progress);

043

}

044

045	private void addListerner() {

046	testDo.setOnClickListener(new ClickEvent());

047

}

048

049	private void initList() {

050	list = new ArrayList<HashMap<String, Object>>();

051	HashMap<String, Object> dataA = new HashMap<String, Object>();

052	HashMap<String, Object> dataB = new HashMap<String, Object>();

053	dataA.put("title", "dataA");

054	dataA.put("current", 0);

055	list.add(dataA);

056	dataB.put("title", "dataB");

057	dataB.put("current", 0);

058	list.add(dataB);

059

060	myAdapet = new MyAdapter(TestListProgress.this, list);

061	progressList.setAdapter(myAdapet);

062

063

}

064

065

// 模拟处理线程

066	class UpdateRunnable implements Runnable {

067

int id;

068	int currentPos = 0;

069	int delay;

070	MyHandler handler;

071

072	public UpdateRunnable(int id, int delay, MyHandler handler) {

073	this.id = id;

074	this.handler = handler;

075	this.delay = delay;

076

}

077

078

@Override

079	public void run() {

080	// TODO Auto-generated method stub

081	while (currentPos <= 100) {

082	Message msg = handler.obtainMessage();

083	msg.what = 1;

084	msg.arg1 = id;

085	msg.arg2 = currentPos;

086	currentPos = currentPos + 5;

087	msg.sendToTarget();

088

try {

089	Thread.sleep(delay);

090	} catch (InterruptedException e) {

091	// TODO Auto-generated catch block

092	e.printStackTrace();

093

}

094

}

095

}

096

097

}

098

099	// 消息Handler用来更新UI

100	class MyHandler extends Handler {

101

@Override

102	public void handleMessage(Message msg) {

103	// TODO Auto-generated method stub

104	switch (msg.what) {

105

case 1:

106	int id = msg.arg1;

107	int current = msg.arg2;

108	updateProgress(id, current);

109

break;

110

}

111	super.handleMessage(msg);

112

}

113

114	private void updateProgress(int id, int currentPos) {

115	HashMap<String, Object> dataTemp = list.get(id);

116	dataTemp.put("current", currentPos);

117	myAdapet.chargeProgress(id, dataTemp);

118

}

119

}

120

121

// 按钮事件

122	class ClickEvent implements View.OnClickListener {

123

124

@Override

125	public void onClick(View v) {

126	// TODO Auto-generated method stub

127	switch (v.getId()) {

128	case (R.id.btn_test):

129	new Thread(new UpdateRunnable(0, 400, myHandler)).start();

130	new Thread(new UpdateRunnable(1, 200, myHandler)).start();

131	System.out.println("OnClick");

132

break;

133

}

134

}

135

136

}

137

138	// List的显示

139	class MyAdapter extends BaseAdapter {

140

141	List<HashMap<String, Object>> list;

142	LayoutInflater infl = null;

143

144	public MyAdapter(Context context, List<HashMap<String, Object>> list) {

145	this.infl = (LayoutInflater) context

146	.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

147	this.list = list;

148

}

149

150

@Override

151	public int getCount() {

152	// TODO Auto-generated method stub

153	return list.size();

154

}

155

156

@Override

157	public Object getItem(int position) {

158	// TODO Auto-generated method stub

159	return list.get(position);

160

}

161

162

@Override

163	public long getItemId(int position) {

164	// TODO Auto-generated method stub

165	return position;

166

}

167

168

@Override

169	public View getView(int position, View convertView, ViewGroup parent) {

170	// TODO Auto-generated method stub

171	convertView = infl.inflate(R.layout.list_layout, null);

172	ProgressBar progressBar = (ProgressBar) convertView

173	.findViewById(R.id.progress);

174	TextView titleView = (TextView) convertView

175	.findViewById(R.id.title);

176

177	HashMap<String, Object> detail = list.get(position);

178	String t = (String) detail.get("title");

179	titleView.setText(t);

180	int progress = (Integer) detail.get("current");

181	progressBar.setProgress(progress);

182	return convertView;

183

}

184

185	// 改变进度，postion就是要改的那个进度

186	public void chargeProgress(int postion, HashMap<String, Object> detail) {

187	this.list.set(postion, detail);

188	// System.out.println("charged:" + detail.get("current"));

189	notifyDataSetChanged();

190

}

191

192

}

193

}

MyAdapet 里面的 chargeProgress是在用来更新List里面的值。

Message里面arg1就是List中的第几个进度条，arg2就是这个进度条里面的当前应该有的进度。what暂时没什么意义，只是为了标识这类消息是用来更新进度条的。本例也只有这一类消息。

这个是List的LayoutXML文件内容：

01	<LinearLayout

02	xmlns:android="http://schemas.android.com/apk/res/android"

03	android:orientation="horizontal"

04	android:layout_width="fill_parent"

05	android:layout_height="fill_parent">

06	<TextView android:id="@+id/title"

07	android:layout_width="wrap_content"

08	android:layout_height="wrap_content"

09	android:text="In list"

10	android:layout_marginRight="5dip"

11

>

12	</TextView>

13	<ProgressBar android:id="@+id/progress"

14	android:layout_width="wrap_content"

15	android:layout_height="wrap_content"

16	style="?android:attr/progressBarStyleHorizontal"

17	android:max="100"

18	android:layout_weight="1.0"

19	android:visibility="visible"

20

/>

21	</LinearLayout>

Acitvity的布局：

01	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

02	android:orientation="vertical"

03	android:layout_width="fill_parent"

04	android:layout_height="fill_parent"

05

>

06

<TextView

07	android:layout_width="fill_parent"

08	android:layout_height="wrap_content"

09	android:text="@string/hello"

10

/>

11	<Button android:id="@+id/btn_test"

12	android:layout_width="fill_parent"

13	android:layout_height="wrap_content"

14	android:text="ListProgress"

15

/>

16	<ListView android:id="@+id/lst_progress"

17	android:layout_width="fill_parent"

18	android:layout_height="wrap_content"

19	android:layout_weight="1.0"

20

>

21	</ListView>

22	</LinearLayout>

效果图如下：