ProgressDialog类似于ProgressBar类。

用于显示一个过程，通常用于耗时操作。

几个方法介绍：

1.setMax()

设置对话框中进度条的最大值。

2.setTile()

设置标题。

3.setProgressStyl()

设置对话框中进度条的样式。例如：环形和水平。

参数：

ProgressDialog.STYLE_SPINNER    环形精度条

ProgressDialog.STYLE_HORIZONTAL     水平样式的进度条

4.setMessage()

设置显示的内容。

演示实例：

用于模拟一个耗时的连接操作。

图：

MainActivity.java

public class MainActivity extends Activity {Button button, button2;ProgressDialog progressDialog;public final static String ABOUT_SERVER = "Connect";// 信息广播接收BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context c, Intent intent) {String str = intent.getStringExtra("DATA");if (str.equals("0")) {progressDialog.setMessage("开始连接");} else if (str.equals("1")) {progressDialog.setMessage("连接完毕");} else {progressDialog.dismiss();}}};@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// 注册广播监听IntentFilter intentFilter = new IntentFilter();intentFilter.addAction(ABOUT_SERVER);registerReceiver(broadcastReceiver, intentFilter);}public void click(View v) {progressDialog = new ProgressDialog(MainActivity.this);progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);progressDialog.setMessage("准备建立连接·············");progressDialog.show();Intent intent = new Intent(MainActivity.this, ServerActivity.class);startService(intent);}}

public class ServerActivity extends Service {Handler handler = new Handler() {public void handleMessage(Message msg) {Intent intent = new Intent(MainActivity.ABOUT_SERVER);if (msg.what == 0) {intent.putExtra("DATA", "0");} else if (msg.what == 1) {intent.putExtra("DATA", "1");} else {intent.putExtra("DATA", "2");ServerActivity.this.stopSelf();}sendBroadcast(intent);};};@Overridepublic void onCreate() {super.onCreate();Thread thread = new Thread(new Runnable() {@Overridepublic void run() {// 要做的事try {for (int i = 0; i < 3; i++) {Thread.sleep(1000);Message message = new Message();message.what = i;handler.sendMessage(message);}} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}});thread.start();}@Overridepublic IBinder onBind(Intent arg0) {// TODO Auto-generated method stubreturn null;}}

This message is already in use.

final Message message = new Message();Thread thread = new Thread(new Runnable() {@Overridepublic void run() {// 要做的事try {for (int i = 0; i < 3; i++) {Thread.sleep(1000);message.what = i;handler.sendMessage(message);}} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}});thread.start();

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