Android listview動態添加刪除測試

http://www.open-open.com/lib/view/open1336025355359.html

最近在學習Android ,listview會經常使用到.做了些測試.有問題請指正.大家一起討論.

 

ListviewTest.java  Activity類

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001	import java.util.ArrayList;

002	import java.util.LinkedHashMap;

003	import java.util.List;

004	import java.util.Random;

005

006	import android.app.Activity;

007	import android.os.Bundle;

008	import android.os.Handler;

009	import android.os.Message;

010	import android.util.Log;

011	import android.view.LayoutInflater;

012	import android.view.View;

013	import android.view.View.OnClickListener;

014	import android.view.ViewGroup;

015	import android.widget.AbsListView;

016	import android.widget.AbsListView.OnScrollListener;

017	import android.widget.BaseAdapter;

018	import android.widget.Button;

019	import android.widget.ListView;

020	import android.widget.ProgressBar;

021	import android.widget.TextView;

022

023	public class ListviewTest  extends Activity implements OnClickListener{

024

025	int jobcounter = 0 ;

026

027	private static final int ADDJOB = 1001;

028	private static final int PROCESSADD = 1002;

029	private static final int PROCESSDONE = 1003;

030	private static final int ITEMBUTTON_CLICKED = 1004;

031

032	private static final String TAG = "ListviewTest";

033

034	protected static final long REFRESH_INTERVAL = 100;

035

036	protected boolean mBusy = false ;

037	long lastupdatetime = 0 ;

038

039

040	Object lock = new Object() ;

041

042	ListView listview ;

043	Button buttonadd ;

044

045	AddjavaListAdapter adapter ;

046	LayoutInflater inflater ;

047

048	LinkedHashMap<Integer, ListInfo> listdatas ;

049

050	LinkedHashMap<Integer, ListInfo> addlist = new LinkedHashMap<Integer, ListviewTest.ListInfo>() ;

051	List<Integer> delidlist = new ArrayList<Integer>() ;

052

053

054	Handler mainhandler = new Handler(){

055

056	public void handleMessage(android.os.Message msg) {

057	long v = System.currentTimeMillis() - lastupdatetime ;

058

059

060	switch (msg.what) {

061	case ADDJOB:

062

063	//if (inView(msg.arg1) && !mBusy) {

064	//                  Log.i(TAG, " ADDJOB done!") ;

065	updateListView();

066	lastupdatetime += REFRESH_INTERVAL ;

067

//}

068

break;

069	case PROCESSADD:

070	if ( !mBusy && v>REFRESH_INTERVAL) {

071	updateListView();

072	lastupdatetime = System.currentTimeMillis() ;

073

}

074

break;

075

076	case ITEMBUTTON_CLICKED:{

077	if(!listdatas.get(msg.arg1).running ) {

078	synchronized (listdatas.get(msg.arg1).lock) {

079	listdatas.get(msg.arg1).lock.notifyAll() ;

080

}

081

}

082	listdatas.get(msg.arg1).running = !listdatas.get(msg.arg1).running ;

083	if ( !mBusy ) {

084	updateListView();

085	lastupdatetime += REFRESH_INTERVAL ;

086

}

087

break;

088

}

089	case PROCESSDONE:

090	//              Log.i(TAG, " PROCESSDONE done!"+msg.arg1) ;

091	synchronized (lock) {

092	delidlist.add(msg.arg1) ;

093

}

094	updateListView();

095	lastupdatetime += REFRESH_INTERVAL ;

096

break;

097

098

default:

099

break;

100

}

101

102

};

103

104

};

105

106	void updateListView(){

107	synchronized (lock) {

108	for (Integer delid : delidlist) {

109	Log.i(TAG, " PROCESSDONE done!"+delid) ;

110	listdatas.remove(delid) ;

111

}

112	listdatas.putAll(addlist) ;

113

114	for (ListInfo info : addlist.values()) {

115

//啓動工作線程

116	new WorkThread("workthread#"+jobcounter,info).start() ;

117	jobcounter++ ;

118

}

119	//清空 delidlist 和 addlist

120	delidlist.clear() ;

121	addlist.clear() ;

122

}

123	adapter.notifyDataSetChanged();

124

}

125

126

127

128

@Override

129	protected void onCreate(Bundle savedInstanceState) {

130	listdatas  = new LinkedHashMap<Integer, ListInfo>() ;

131	super.onCreate(savedInstanceState);

132	setContentView(R.layout.listviewtest);

133

134	listview = (ListView) findViewById(R.id.listView001) ;

135	adapter = new AddjavaListAdapter();

136	listview.setAdapter(adapter) ;

137	//設置 當listview 進行上下拖動操作時的狀態

138	listview.setOnScrollListener( new OnScrollListener() {

139

140

@Override

141	public void onScrollStateChanged(AbsListView view, int scrollState) {

142	switch (scrollState) {

143	case OnScrollListener.SCROLL_STATE_IDLE:

144	mBusy = false;

145

146

break;

147	case OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:

148	mBusy = true;

149

break;

150	case OnScrollListener.SCROLL_STATE_FLING:

151	mBusy = true;

152

break;

153

}

154

}

155

156

@Override

157	public void onScroll(AbsListView view, int firstVisibleItem,

158	int visibleItemCount, int totalItemCount) {

159

160

}

161

}) ;

162

163

164	buttonadd  = (Button) findViewById(R.id.button_listaddjob);

165	buttonadd.setOnClickListener(this);

166

167	inflater = LayoutInflater.from(this);

168

169

}

170	// 存放單條 listview 的數據

171	class ListInfo{

172

@Override

173	public String toString() {

174	return "ListInfo [index=" + index + ", id=" + id + ", running="

175	+ running + ", title=" + title + ", process=" + process

176

+ "]";

177

}

178	int index ;

179

long id ;

180	boolean running = true ;

181

182	String title  ;

183	int process ;

184

185	Object lock = new Object();

186

}

187

188	class ViewHodler{

189

190

191	TextView text ;

192	ProgressBar bar ;

193	Button button ;

194	ItemClickListener listener;

195

196

}

197

198	// listview的適配器

199	class AddjavaListAdapter extends BaseAdapter {

200

201

202

203

@Override

204	public int getCount() {

205	return listdatas.keySet().size();

206

}

207

208

@Override

209	public Object getItem(int position) {

210	//從 listdata裏獲取 對應的數據 ,因爲有刪除的緣故.在有任務完成後 position不等於listdata的key

211	Object[] d = listdatas.keySet().toArray() ;

212	int c = (Integer)d[position] ;

213	//          Log.i(TAG, "~~~~~getItem~~position["+position+"] [c="+c+"]") ;

214	return listdatas.get(c) ;

215

}

216

217

@Override

218	public long getItemId(int position) {

219	return ((ListInfo)this.getItem(position)).id ;

220

}

221

222

@Override

223	public View getView(int position, View v, ViewGroup parent) {

224	ViewHodler holder ;

225	//  獲取單條item 的view對象

226	if (v==null) {

227	v = inflater.inflate(R.layout.listview_item, null) ;

228	holder = new ViewHodler() ;

229

230	holder.text = (TextView) v.findViewById(R.id.textView_item) ;

231	holder.bar = (ProgressBar) v.findViewById(R.id.progressBar_item);

232	holder.button = (Button) v.findViewById(R.id.button_item) ;

233	holder.listener = new ItemClickListener() ;

234

235	v.setTag(holder) ;

236

237

}else{

238	holder = (ViewHodler) v.getTag();

239

}

240	//將數據顯示到每個對應的 view上.

241	final ListInfo data = (ListInfo)getItem(position) ;

242

243	holder.listener.setId(data.index) ;

244	holder.button.setOnClickListener(holder.listener) ;

245

246	holder.text.setText(data.title) ;

247	holder.bar.setProgress(data.process) ;

248	if (data.running) {

249	holder.button.setText(R.string.item_stop) ;

250

}else{

251	holder.button.setText(R.string.item_start) ;

252

}

253

254

return v;

255

}

256

257

}

258

259

260	class ItemClickListener implements  OnClickListener{

261	private int id ;

262

263	public void setId(int id) {

264	this.id = id;

265

}

266

267

@Override

268	public void onClick(View v) {

269	Log.i(TAG,"button clicked! "+id +"|"+listdatas.get(id).running+"-->"+!listdatas.get(id).running);

270	sendMessageToHandler(ITEMBUTTON_CLICKED,id) ;

271

}

272

273

}

274

275	class WorkThread extends Thread{

276

277	ListInfo in ;

278	public WorkThread(String name ,ListInfo in){

279	super(name) ;

280	this.in = in ;

281

}

282

283

@Override

284	public void run() {

285	ListInfo sdata = listdatas.get(in.index) ;

286

287	while(sdata.process<100) {

288

289	//如果暫停 則等待

290	if(!listdatas.get(in.index).running ) {

291	synchronized (listdatas.get(in.index).lock) {

292

try {

293	listdatas.get(in.index).lock.wait() ;

294	} catch (InterruptedException e) {

295	e.printStackTrace();

296

}

297

}

298

}

299	//模擬耗時任務操作

300

try {

301	Thread.sleep((int)(3000*new Random().nextDouble()));

302	} catch (InterruptedException e) {

303	e.printStackTrace();

304

}

305	sdata.process += new Random().nextInt(15)+1 ;

306	sendMessageToHandler(PROCESSADD,in.index) ;

307

}

308	//發送任務結束消息

309	if (sdata.process>=100) {

310	sendMessageToHandler(PROCESSDONE,in.index) ;

311	//              Log.i(TAG, this.getName()+"#done") ;

312

313

}

314

}

315

316

}

317

318

319

@Override

320	public void onClick(View v) {

321	switch (v.getId()) {

322	case R.id.button_listaddjob:{

323

324	ListInfo info = new ListInfo() ;

325	info.title = "file" + jobcounter ;

326	info.process = 0 ;

327	info.id = jobcounter ;

328	info.index = jobcounter ;

329	synchronized (lock) {

330	addlist.put(jobcounter, info) ;

331

}

332	sendMessageToHandler(ADDJOB,jobcounter) ;

333

334

break;

335

}

336

337

default:

338

break;

339

}

340

}

341

342

343	void sendMessageToHandler(int what,int arg1){

344	Message message = mainhandler.obtainMessage() ;

345	message.what = what ;

346	message.arg1 = arg1 ;

347	message.sendToTarget() ;

348

}

349

350

}

佈局文件 listview_item.xml

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01	<?xml version="1.0" encoding="utf-8"?>

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

03	android:id="@+id/listview_item"

04	android:layout_width="match_parent"

05	android:layout_height="wrap_content"

06	android:orientation="horizontal" >

07

08

<TextView

09	android:id="@+id/textView_item"

10	android:layout_width="wrap_content"

11	android:layout_height="wrap_content"

12	android:layout_gravity="center_vertical"

13	android:text="TextView" />

14

15	<ProgressBar

16	android:id="@+id/progressBar_item"

17	style="?android:attr/progressBarStyleHorizontal"

18	android:layout_width="wrap_content"

19	android:layout_height="wrap_content"

20	android:layout_gravity="center_vertical"

21	android:layout_weight="0.75" />

22

23

<Button

24	android:id="@+id/button_item"

25	android:layout_width="wrap_content"

26	android:layout_height="wrap_content"

27	android:layout_gravity="center_vertical"

28	android:focusable="false"

29	android:text="@string/start" />

30

31

32

33	</LinearLayout>

佈局文件 listviewtext.xml

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01	<?xml version="1.0" encoding="utf-8"?>

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

03

04	android:layout_width="match_parent"

05	android:layout_height="match_parent"

06	android:orientation="vertical" >

07

08

09

<Button

10	android:id="@+id/button_listaddjob"

11	android:layout_width="wrap_content"

12	android:layout_height="wrap_content"

13	android:text="@string/add" />

14

15

<ListView

16	android:id="@+id/listView001"

17	android:layout_width="match_parent"

18	android:layout_height="wrap_content" >

19	</ListView>

20

21	</LinearLayout>