Android multithreading progress bar

Update the android progress bar using multiple threads.

Instance tutorial. For details, I have commented out the android multithreading progress bar 01 package com. shougao. hello; 0203 import android. app. activity; 04 import android. OS. bundle; 05 import android. OS. handler; 06 import android. OS. message; 07 import android. view. view; 08 import android. view. view. onClickListener; 09 import android. widget. button; 10 import android. widget. progressBar; 1112 public class HelloActivity extends Activity {13/** Called when the activity is first cr Eated. */1415 private ProgressBar progressBar; 16 private Button startButton; 1718 @ Override19 public void onCreate (Bundle savedInstanceState) {20 super. onCreate (savedInstanceState); 21 setContentView (R. layout. main); 2223 progressBar = (ProgressBar) findViewById (R. id. progressbar); 24 startButton = (Button) findViewById (R. id. startButton); 2526 startButton. setOnClickListener (new ProgressBarOnClickListener (); 27} 2829 class ProgressBarOnClickListener implements OnClickListener {30 public void onClick (View v) {31 // set the progress bar to the visible status 32 progressBar. setVisibility (View. VISIBLE); 33 // Add updataThread to message queue 34 updateBarHandler. post (updateThread); 35} 36} 3738 // use an anonymous internal class to re-write the handlerMessage () method 39 in the Handler. // This handler needs to be executed repeatedly, until there is no Message in the Message queue. 40 // The progress bar is refreshed during execution. 41 Handler updateBarHandler = new Handler () {42 @ Override43 public void handleMessage (Message msg) {44 System. out. println ("---------- start handle"); 45 progressBar. setProgress (msg. arg1); 46 updateBarHandler. post (updateThread); // put the thread to be executed into the queue 47} 48}; 4950 // Thread class, this class declares using an anonymous internal class 51 Runnable updateThread = new Runnable () {52 int I = 0; 5354 public void run () {55 // TODO Auto-generated method stub56 Sy Stem. out. println ("---------- Begin Thread"); 57 I + = 20; 58 // get a Message object. The Message class is 59 Message msg = updateBarHandler provided by android. obtainMessage (); 60 // set the value of the arg1 parameter of the Message object to i61 msg. arg1 = I; // use the two member variables arg1 and arg2 to transmit messages. The advantage is that the system performance consumption is less than 62 try {63 Thread. sleep (3000); // sleep the current thread for 1000 milliseconds 64} catch (InterruptedException ex) {65 ex. printStackTrace (); 66} 67 // Add the Message object to the message Queue. When the next logoff calls the Message queue, use this message to display the progress bar 68 // Or put the progress Message with an increase of 10% in the queue of updateBarHandler. 69 if (I <101) {70 updateBarHandler. sendMessage (msg); 71} 72 // if the I value is 10073 if (I = 100) {74 // remove 75 updateBarHandler from the queue. removeCallbacks (updateThread); 76} 77} 78}; 79}