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1 package com.bvin.exec;

2

3 import java.io.IOException;

4 import java.net.MalformedURLException;

5 import java.net.URL;

6 import java.util.concurrent.ExecutorService;

7 import java.util.concurrent.Executors;

8

9 import android.app.Activity;

10 import android.graphics.drawable.Drawable;

11 import android.os.AsyncTask;

12 import android.os.Bundle;

13 import android.os.Handler;

14 import android.os.HandlerThread;

15 import android.os.Message;

16 import android.util.Log;

17 import android.view.View;

18 import android.widget.Button;

19 import android.widget.ImageView;

20

21 public class MainActivity extends Activity {

22???? /** Called when the activity is first created. */

23

24???? private Handler handler ;

25???? private Button bt;

26???? private Handler mainHandler = new Handler(){

27

28???????? @Override

29???????? public void handleMessage(Message msg) {

30???????????? // TODO Auto-generated method stub

31???????????? super.handleMessage(msg);

32???????????? if(msg.what == 2012){

33???????????????? //只要在主線程就可以處理ui

34???????????????? ((ImageView)MainActivity.this.findViewById(msg.arg1)).setImageDrawable((Drawable)msg.obj);

35???????????? }

36???????? }

37

38

39???? };

40

41???? private ExecutorService service = Executors.newFixedThreadPool(5);

42

43???? @Override

44???? public void onCreate(Bundle savedInstanceState) {

45???????? super.onCreate(savedInstanceState);

46???????? setContentView(R.layout.main);

47???????? initViews();

48???????? HandlerThread ht = new HandlerThread("down image thread");

49???????? ht.start();

50???????? handler = new Handler(ht.getLooper()){//如果有了looper那么這個handler就不可以處理ui了

51

52???????????? @Override

53???????????? public void handleMessage(Message msg) {

54???????????????? // TODO Auto-generated method stub

55???????????????? super.handleMessage(msg);

56

57

58???????????? }

59

60???????? };

61

62???? }

63

64???? private void initViews(){

65

66???????? bt = (Button)findViewById(R.id.bt);

67???????? bt.setOnClickListener(new View.OnClickListener() {

68

69???????????? @Override

70???????????? public void onClick(View v) {

71???????????????? // TODO Auto-generated method stub

72???????????????? loadImagesByExecutors("http://news.baidu.com/z/resource/r/image/2012-11-23/23c1625aca99f02c50d8e510383a34e7.jpg",R.id.iv1);

73???????????????? loadImagesByExecutors("http://news.baidu.com/z/resource/r/image/2012-11-23/c4698d97ef6d10722c8e917733c7beb3.jpg",R.id.iv2);

74???????????????? loadImagesByExecutors("http://news.baidu.com/z/resource/r/image/2012-11-23/f332ffe433be2a3112be15f78bff5a40.jpg",R.id.iv3);

75???????????????? loadImagesByExecutors("http://news.baidu.com/z/resource/r/image/2012-11-23/6ff8a9c647a1e80bc602eeda48865d4c.jpg",R.id.iv4);

76???????????????? loadImagesByExecutors("http://news.baidu.com/z/resource/r/image/2012-11-23/f104d069f7443dca52a878d779392874.jpg",R.id.iv5);

77???????????? }

78???????? });

79???? }

80

81???? private void loadImagesByHandler(final String url,final int id){//通過擁有l(wèi)ooper的handler.post(runnable)，新建線程

82

83

84???????? handler.post(new Runnable(){//如果handler沒有Looper那么它就不能構(gòu)建新線程了

85

86???????????? @Override

87???????????? public void run() {

88???????????????? // TODO Auto-generated method stub

89???????????????? Log.e("當(dāng)前線程：", ""+Thread.currentThread().getName());

90???????????????? Drawable drawable = null;

91???????????????? try {

92???????????????????? drawable = Drawable.createFromStream(new URL(url).openStream(), "image.gif");

93???????????????? } catch (MalformedURLException e) {

94???????????????????? // TODO Auto-generated catch block

95???????????????????? e.printStackTrace();

96???????????????? } catch (IOException e) {

97???????????????????? // TODO Auto-generated catch block

98???????????????????? e.printStackTrace();

99???????????????? }

100???????????????? //SystemClock.sleep(2000);

101???????????????? //((ImageView)MainActivity.this.findViewById(id)).setImageDrawable(drawable);

102???????????????? Message msg = mainHandler.obtainMessage();

103???????????????? msg.what = 2012;

104???????????????? msg.arg1 = id;

105???????????????? msg.obj = drawable;

106???????????????? msg.sendToTarget();

107???????????? }

108

109???????? });

110

111

112???? }

113

114???? private void loadImagesByThread(final String url,final int id){//通過Thread來new 出多個線程

115

116???????? new Thread(new Runnable(){

117

118???????????? @Override

119???????????? public void run() {

120???????????????? // TODO Auto-generated method stub

121???????????????? Log.e("當(dāng)前線程：", ""+Thread.currentThread().getName());

122???????????????? Drawable drawable = null;

123???????????????? try {

124???????????????????? drawable = Drawable.createFromStream(new URL(url).openStream(), "image.gif");

125???????????????? } catch (MalformedURLException e) {

126???????????????????? // TODO Auto-generated catch block

127???????????????????? e.printStackTrace();

128???????????????? } catch (IOException e) {

129???????????????????? // TODO Auto-generated catch block

130???????????????????? e.printStackTrace();

131???????????????? }

132???????????????? Message msg = mainHandler.obtainMessage();

133???????????????? msg.what = 2012;

134???????????????? msg.arg1 = id;

135???????????????? msg.obj = drawable;

136???????????????? msg.sendToTarget();

137

138???????????? }

139

140???????? }).start();

141???? }

142

143???? private void loadImageByAsyncTask(final String url,final int id){//構(gòu)建異步任務(wù)，這樣就不用handler來處理消息了

144???????? DownloadTask task = new DownloadTask();

145???????? task.execute(""+id,url);//AsyncTask不可重復(fù)執(zhí)行

146???? }

147

148???? private void loadImagesByExecutors(final String url,final int id){

149???????? service.submit(new Runnable(){

150

151???????????? @Override

152???????????? public void run() {

153???????????????? // TODO Auto-generated method stub

154???????????????? Log.e("當(dāng)前線程：", ""+Thread.currentThread().getName());

155

156???????????????? try {

157???????????????????? final Drawable drawable? = Drawable.createFromStream(new URL(url).openStream(), "image.gif");

158???????????????????? mainHandler.post(new Runnable(){

159

160???????????????????????? @Override

161???????????????????????? public void run() {//這將在主線程運行

162???????????????????????????? // TODO Auto-generated method stub

163???????????????????????????? ((ImageView)MainActivity.this.findViewById(id)).setImageDrawable(drawable);

164???????????????????????? }

165???????????????????? });

166

167???????????????? } catch (MalformedURLException e) {

168???????????????????? // TODO Auto-generated catch block

169???????????????????? e.printStackTrace();

170???????????????? } catch (IOException e) {

171???????????????????? // TODO Auto-generated catch block

172???????????????????? e.printStackTrace();

173???????????????? }

174

175???????????? }

176

177???????? });

178

179???? }

180

181???? class DownloadTask extends AsyncTask{

182

183???????? int id;

184???????? @Override

185???????? protected Drawable doInBackground(String... params) {//params保存url和控件id兩個數(shù)據(jù)

186???????????? // TODO Auto-generated method stub

187???????????? Log.e("當(dāng)前線程：", ""+Thread.currentThread().getName());

188???????????? Drawable drawable = null;

189???????????? this.id = Integer.parseInt(params[0]);

190???????????? try {

191???????????????? drawable = Drawable.createFromStream(new URL(params[1]).openStream(), "image.gif");

192???????????? } catch (MalformedURLException e) {

193???????????????? // TODO Auto-generated catch block

194???????????????? e.printStackTrace();

195???????????? } catch (IOException e) {

196???????????????? // TODO Auto-generated catch block

197???????????????? e.printStackTrace();

198???????????? }

199

200???????????? return drawable;

201???????? }

202

203???????? @Override

204???????? protected void onPostExecute(Drawable result) {

205???????????? // TODO Auto-generated method stub

206???????????? super.onPostExecute(result);

207???????????? ((ImageView)MainActivity.this.findViewById(id)).setImageDrawable(result);

208???????? }

209

210???????? @Override

211???????? protected void onPreExecute() {

212???????????? // TODO Auto-generated method stub

213???????????? super.onPreExecute();

214???????? }

215

216???????? @Override

217???????? protected void onProgressUpdate(Integer... values) {

218???????????? // TODO Auto-generated method stub

219???????????? super.onProgressUpdate(values);

220???????? }

221

222

223???? }

224 }

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