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() {
@Override
public 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();
}
}
};
@Override
public 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);
}
}activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="${relativePackage}.${activityClass}" >
<Button
android:id="@+id/but"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="click"
android:text="点击" />
</LinearLayout>ServerActivity.java
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);
};
};
@Override
public void onCreate() {
super.onCreate();
Thread thread = new Thread(new Runnable() {
@Override
public 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 block
e.printStackTrace();
}
}
});
thread.start();
}
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
}AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<service android:name="com.example.test.ServerActivity"></service>
<activity
android:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>final Message message = new Message();
Thread thread = new Thread(new Runnable() {
@Override
public 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 block
e.printStackTrace();
}
}
});
thread.start();使用了同一个Message。用的API
19（4.4）与4.4模拟器，不显示错误，只是卡住，用的API 19（4.4）与2.2模拟器就报错了。原文地址：http://blog.csdn.net/u011609853/article/details/45131711
