ProgressDialog==>进度条对话框
ProgressDialog本身就代表一个进度条对话框，程序只需要创建ProgressDialog实例，并将其显示出来就是一个进度条对话框；开发者也可以设置进度对话框里进度条的方法。
包含了如下常用方法：
1.setIndeterminate(boolean indeterminate):设置对话框里的进度条是否显示进度值；
2.setMax(int max):设置对话框里进度条的最大值；
3.setMessage(CharSequence message):设置对话框里显示的消息；
4.setProgress(int value):设置对话框里进度条的进度值；
5.setProgressStyle(int style):设置对话框里进度条的风格；
实例如下：
布局文件==》代码实现==》package com.example.myprogressdialog1;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.app.Dialog;import android.app.ProgressDialog;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity{ private int[] date = new int[100]; private int hasDate = 0; final int progress_Dialog = 0x112; private int progressStatus = 0; private ProgressDialog pd; private Handler handler; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btnexec = (Button) this.findViewById(R.id.btnexec); btnexec.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { showDialog(progress_Dialog); } }); handler = new Handler() { @Override public void handleMessage(Message msg) { if (msg.what == 0x112) { pd.setProgress(progressStatus); } } }; } @Override protected Dialog onCreateDialog(int id, Bundle args) { System.out.println("---------------create---------------"); switch (id) { case progress_Dialog: pd = new ProgressDialog(this); pd.setMax(100); pd.setTitle("任务完成百分比"); pd.setMessage("耗时任务完成百分比"); // 设置对话框取消按钮不可用 pd.setCancelable(false); // 设置对话框进度条样式风格 pd.setProgressStyle(ProgressDialog.STYLE_SPINNER); pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); // 设置对话框的进度条是否显示进度 pd.setIndeterminate(true); break; } return pd; } // 该方法将在onCreateDialog()调用之后被回调 @Override protected void onPrepareDialog(int id, Dialog dialog) { System.out.println("-----------------prepare-----------------"); super.onPrepareDialog(id, dialog); switch (id) { case progress_Dialog: pd.incrementSecondaryProgressBy(-pd.getProgress()); new Thread() { public void run() { while (progressStatus < 100) { progressStatus = doWork(); Message msg = new Message(); msg.what = 0x112; handler.sendMessage(msg); } if (progressStatus >= 100) { pd.dismiss();// 关闭对话框 } } }.start(); break; } } private int doWork() { date[hasDate++] = (int) (Math.random() * 100); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } return hasDate; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; }}
运行效果：
