使用线程跟踪进度条当前进度示例
主要是通过android.os.Handler的消息机制实现控制package com.example.progressdialog;import android.app.Activity;import android.app.Dialog;import android.app.ProgressDialog;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class NotificationTest extends Activity { static final int PROGRESS_DIALOG = 0; Button button; ProgressThread progressThread; ProgressDialog progressDialog; /** Called when the activity is first created. */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Setup the button that starts the progress dialog button = (Button) findViewById(R.id.progressDialog); button.setOnClickListener(new OnClickListener(){ public void onClick(View v) { showDialog(PROGRESS_DIALOG); } }); } protected Dialog onCreateDialog(int id) { switch(id) { case PROGRESS_DIALOG: progressDialog = new ProgressDialog(NotificationTest.this); progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); progressDialog.setMessage("Loading..."); progressThread = new ProgressThread(handler); progressThread.start(); return progressDialog; default: return null; } } // Define the Handler that receives messages from the thread and update the progress final Handler handler = new Handler() { public void handleMessage(Message msg) { int total = msg.getData().getInt("total"); progressDialog.setProgress(total); if (total >= 100){ dismissDialog(PROGRESS_DIALOG); progressThread.setState(ProgressThread.STATE_DONE); } } }; /** Nested class that performs progress calculations (counting) */ private class ProgressThread extends Thread { Handler mHandler; final static int STATE_DONE = 0; final static int STATE_RUNNING = 1; int mState; int total; ProgressThread(Handler h) { mHandler = h; } public void run() { mState = STATE_RUNNING; total = 0; while (mState == STATE_RUNNING) { try { Thread.sleep(100); } catch (InterruptedException e) { Log.e("ERROR", "Thread Interrupted"); } Message msg = mHandler.obtainMessage(); Bundle b = new Bundle(); b.putInt("total", total); msg.setData(b); mHandler.sendMessage(msg); total++; } } /* sets the current state for the thread, * used to stop the thread */ public void setState(int state) { mState = state; } }}
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