Android --- Handler 多線程通信示例(ProgressBar)

1、修改main.xml文件

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout
3. xmlns:Android="http://schemas.android.com/apk/res/android"
4. android:orientation="vertical"
5. android:layout_width="fill_parent"
6. android:layout_height="fill_parent">
7. <ProgressBar
8. style="?android:attr/progressBarStyleHorizontal"
9. android:id="@+id/progressBar1"
10. android:max="100"
11. android:progress="0"
12. android:secondaryProgress="0"
13. android:visibility="visible"
14. android:layout_height="wrap_content"
15. android:layout_width="match_parent"></ProgressBar>
16. </LinearLayout>

1. package com.bison;
3. import android.os.Message;
5. public class SonThread extends Thread {
6. private int i = 0;
8. @Override
9. public void run() {
10. while (i < 100) {
11. i = i + 10;
12. Message msg = new Message();
13. msg.arg1 = i;
14. try {
15. Thread.sleep(1000);
16. } catch (InterruptedException e) {
17. e.printStackTrace();
18. }
19. HandlerTestActivity.myHandler.sendMessage(msg);
21. }
22. if (i == 100) {
23. HandlerTestActivity.myHandler.removeCallbacks(this);
24. }
25. }
26. }

1. package com.bison;
3. import android.app.Activity;
4. import android.os.Bundle;
5. import android.os.Handler;
6. import android.os.Message;
7. import android.widget.ProgressBar;
9. public class HandlerTestActivity extends Activity {
10. private ProgressBar progressBar;
11. private SonThread myThread;
13. public static Handler myHandler;
15. public void init() {
16. progressBar = (ProgressBar) findViewById(R.id.progressBar1);
17. myThread = new SonThread();
18. myThread.start();
19. myHandler = new Handler() {
21. @Override
22. public void handleMessage(Message msg) {
24. super.handleMessage(msg);
25. progressBar.setProgress(msg.arg1);
26. }
27. };
28. }
30. @Override
31. public void onCreate(Bundle savedInstanceState) {
32. super.onCreate(savedInstanceState);
33. setContentView(R.layout.main);
34. init();
35. }
37. }

PS：沒有打上注釋，不過Handler的通信機制還是比較好理解的。

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