[Android] 多執行緒 - Handler和Thread的關係

講解初學者搞不清楚的ANR等錯誤

Transcript

1. )BOEMFSẸ5ISFBE᧣໹๹ Johnny Sung 2013/08/22 ၞ᭸ḝ緒 1 Thursday, August 22, 13
2. ໹ᜐᚕ • I'm an Android developer. Also learning iOS development. • Information Management in Shih Hsin University • 相關作品： • Good! 愛點兒 • 世新廣播電台 • 主要語⾔言： • Obj-C / Java / C# / PHP 2 Thursday, August 22, 13
3. (PPE
   ᛔᨬᚑ 3 Thursday, August 22, 13
4. ᕴ᙮༃ᴶᨘᴈ 4 Thursday, August 22, 13
5. 5 Thursday, August 22, 13
6. 6 Thursday, August 22, 13
7. ዧ᩼ 7 Thursday, August 22, 13
8. 8 Thursday, August 22, 13
9. 9 "/3
   
   "DUJWJUZ
   /PU
   3FTQPOEJOH http://developer.android.com/training/articles/perf-anr.html Thursday, August 22, 13
10. .VMUJ5ISFBEJOH
    ၞ᭸ḝ緒 ↟3VOOBCMF ↟5ISFBE ↟)BOEMFS ↟.FTTBHF 10 Thursday, August 22, 13
11. 11 Thursday, August 22, 13
12. 3VOOBCMF 12 Thursday, August 22, 13
13. 13 Thursday, August 22, 13
14. class GetWebPicture implements Runnable { @Override public void run() { // ........ } } 14 Thursday, August 22, 13
15. 5ISFBE 顧名思義，它就叫執⾏行緒 15 Thursday, August 22, 13
16. 16 Thursday, August 22, 13
17. 5ISFBEᠹᢶᐠᤍ᪽ ↟ၣᮈṞ
    5ISFBE
    +BWBᡰᢶ᧣ ↟ᓝ᫳Ṟ
    )BOEMFS5ISFBE
    
    
    "OESPJEᴰᢶ᧣ 常駐型 HandlerThread留到後⾯面再說 17 Thursday, August 22, 13
18. 18 new Thread(new Runnable() { @Override public void run() { // ...... } }).start(); Thursday, August 22, 13
19. new Thread() { @Override public void run() { // .... } }.start(); 19 Thursday, August 22, 13
20. Main Thread(UI Thread) 20 Thursday, August 22, 13
21. Main Thread(UI Thread) 20 Thursday, August 22, 13
22. new Thread() { @Override public void run() { // .... } }.start(); Thread1 Main Thread(UI Thread) 20 Thursday, August 22, 13
23. new Thread() { @Override public void run() { // .... } }.start(); Thread1 Main Thread(UI Thread) 20 Thursday, August 22, 13
24. new Thread() { @Override public void run() { // .... } }.start(); Thread1 Main Thread(UI Thread) runOnUiThread(new Runnable() { public void run() { // ...... } }); 20 Thursday, August 22, 13
25. new Thread() { @Override public void run() { // .... } }.start(); Thread1 Main Thread(UI Thread) runOnUiThread(new Runnable() { public void run() { // ...... } }); 20 Thursday, August 22, 13
26. )BOEMFS5ISFBE 是⼀一種常駐型的Thread 21 Thursday, August 22, 13
27. mThread = new HandlerThread("name"); mThread.start(); mThreadHandler = new Handler(mThread.getLooper()) { public void handleMessage(android.os.Message msg) { switch (msg.what) { case START_SERVER: // ..... break; case STOP_SERVER: // ..... break; default: break; } } }; 在onCreate()之中 22 Thursday, August 22, 13
28. 在onDestroy()之中 if (mThread != null) mThread.quit(); 寫在Service裡⾯面不錯⽤用 23 Thursday, August 22, 13
29. Main Thread(UI Thread) onCreate() onResume() onPause() onDestroy() 24 Thursday, August 22, 13
30. HandlerThread1 Main Thread(UI Thread) onCreate() onResume() onPause() onDestroy() mThread = new HandlerThread("name"); mThread.start(); 24 Thursday, August 22, 13
31. HandlerThread1 Main Thread(UI Thread) onCreate() onResume() onPause() onDestroy() mThread = new HandlerThread("name"); mThread.start(); if (mThread != null) mThread.quit(); 24 Thursday, August 22, 13
32. HandlerThread1 Main Thread(UI Thread) onCreate() onResume() onPause() onDestroy() mThread = new HandlerThread("name"); mThread.start(); if (mThread != null) mThread.quit(); (Idle) (Running) (Running) (Idle) (Idle) 24 Thursday, August 22, 13
33. )BOEMFS 25 Thursday, August 22, 13
34. 26 Thursday, August 22, 13
35. Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 0: // ....... break; case 1: // ....... break; case 2: // ....... break; default: break; } } }; 27 Thursday, August 22, 13
36. .FTTBHF 28 Thursday, August 22, 13
37. .FTTBHFᲘᙈ᠓᤼ᜡᤎᵵᬞ 29 Thursday, August 22, 13
38. ᠭ᤼෪值
    
    ᤼༾ề ႚᶡ᤼ᴣᑺᨼ 3VOOBCMF 30 Thursday, August 22, 13
39. 31 Thursday, August 22, 13
40. obtainMessage(int what); obtainMessage(int what, int arg1, int arg2); obtainMessage(int what, int arg1, int arg2, Object obj); obtainMessage(int what, Object obj); ፇᙺᙛ 記得加上.sendToTarget()才會發送 sendEmptyMessage(int what) 32 Thursday, August 22, 13
41. http://developer.android.com/reference/android/os/Handler.html ࿠᳔ᓝᠭ᧣.FUIPE 33 Thursday, August 22, 13
42. ᚕᬟᓡᒊ෪ᖀჱᔕ .FTTBHF
    
    )BOEMFS
    ፖᙚ႞ᚕᅄᕔᴉᏝᦅᇇ 34 Thursday, August 22, 13
43. ᢶኼᢶ๞᳓᧣ፖ᎚Ħ 35 Thursday, August 22, 13
44. ᢶ 36 Thursday, August 22, 13
45. SVO0O6J5ISFBE 37 Thursday, August 22, 13
46. runOnUiThread(new Runnable() { public void run() { // ...... } }); 38 Thursday, August 22, 13
47. ᜊᚕዤජ᤼᷀ᡰᘿሳ 39 Thursday, August 22, 13
48. https://github.com/android/platform_frameworks_base/blob/master/core/java/android/app/Activity.java // Reference from Activity.java /** * Runs the specified action on the UI thread. If the current thread is the * UI thread, then the action is executed immediately. If the current thread * is not the UI thread, the action is posted to the event queue of the UI * thread. * * @param action * the action to run on the UI thread */ public final void runOnUiThread(Runnable action) { if (Thread.currentThread() != mUiThread) { mHandler.post(action); } else { action.run(); } } 40 Thursday, August 22, 13
49. 41 Thursday, August 22, 13
50. 2
    
    " 42 Thursday, August 22, 13
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