主要用于表示程序的操作进度
默认风格的进度条
在main.xml中：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:orientation="vertical"
android:gravity="center_horizontal">
<ProgressBar
android:id="@+id/myprobarA"
android:layout_marginTop="18dp"
style="?android:attr/progressBarStyle"
android:layout_width="50dp"
android:layout_height="50dp"/>
</LinearLayout>
隐藏进度条
在main.xml中：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:orientation="vertical"
android:gravity="center_horizontal">
<ProgressBar
android:id="@+id/myprobarA"
android:layout_marginTop="18dp"
style="?android:attr/progressBarStyle"
android:layout_width="50dp"
android:layout_height="50dp"
android:visibility="gone"/> //隐藏进度条
</LinearLayout>
第二进度条（显示）
在main.xml中：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:orientation="vertical"
android:gravity="center_horizontal">
<ProgressBar
android:id="@+id/myprobarA"
android:layout_marginTop="18dp"
style="?android:attr/progressBarStyle"
android:layout_width="50dp"
android:layout_height="50dp"/>
<ProgressBar
android:id="@+id/myprobarB"
android:layout_margin="8dp"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<ProgressBar
android:id="@+id/myprobarC"
android:layout_margin="8dp"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="120"
android:progress="80"/>
</LinearLayout>
控制进度条
在main.xml中：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:orientation="vertical"
android:gravity="center_horizontal">
<ProgressBar
android:id="@+id/myprobarA"
android:visibility="gone"
android:layout_marginTop="8dp"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ProgressBar
android:id="@+id/myprobarB"
android:visibility="gone"
android:layout_margin="8dp"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<ProgressBar
android:id="@+id/myprobarC"
android:visibility="gone"
android:layout_margin="8dp"
style="?android:attr/progressBarStyleHorizontal"
android:max="120"
android:progress="0"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/mybut"
android:text="显示进度条"
android:background="#3399ff"
android:textColor="#ffffff"
android:layout_marginTop="18dp"
android:layout_width="120dp"
android:layout_height="40dp" />
</LinearLayout>
在MyProgressBarDemo.java中：
package com.li.progressbar;
import android.app.Activity;
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;
import android.widget.ProgressBar;
public class MyProgressBarDemo extends Activity {
private static final int STOP = 1 ;
private static final int CONTINUE = 2 ;
private ProgressBar myprobarA, myprobarB, myprobarC;
private Button mybut ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.myprobarA = (ProgressBar) super.findViewById(R.id.myprobarA) ;
this.myprobarB = (ProgressBar) super.findViewById(R.id.myprobarB) ;
this.myprobarC = (ProgressBar) super.findViewById(R.id.myprobarC) ;
this.mybut = (Button) super.findViewById(R.id.mybut) ;
this.myprobarA.setIndeterminate(false) ; // 不确定模式
this.myprobarB.setIndeterminate(false) ; // 不确定模式
this.myprobarC.setIndeterminate(true) ; // 确定模式
this.mybut.setOnClickListener(new OnClickListenerImpl()) ; // 单击事件
}
private class OnClickListenerImpl implements OnClickListener {
public void onClick(View v) {
MyProgressBarDemo.this.myprobarB.setSecondaryProgress(50) ;
MyProgressBarDemo.this.myprobarA.setVisibility(View.VISIBLE) ;
MyProgressBarDemo.this.myprobarB.setVisibility(View.VISIBLE) ;
MyProgressBarDemo.this.myprobarC.setVisibility(View.VISIBLE) ;
MyProgressBarDemo.this.myprobarA.setMax(120) ;
MyProgressBarDemo.this.myprobarB.setMax(120) ;
MyProgressBarDemo.this.myprobarA.setProgress(0) ;
MyProgressBarDemo.this.myprobarB.setProgress(0) ;
new Thread(new Runnable() {
public void run() {
int count = 0; // 保存当前进度的值
for (int i = 0; i < 10; i++) {
count = (i + 1) * 10; // 进度的增长快一些
try {// 每次操作延迟500MS
Thread.sleep(500);
} catch (InterruptedException e) {
}
if (i == 12) { // 正好增长到120
Message m = new Message() ;
m.what = MyProgressBarDemo.STOP ; // 停止
MyProgressBarDemo.this.myMessageHandler.sendMessage(m) ;// 停止
} else {
Message m = new Message() ;
m.what = MyProgressBarDemo.CONTINUE ;
m.arg1 = count ;
MyProgressBarDemo.this.myMessageHandler.sendMessage(m) ;
}
}
}
}).start();
}
}
private Handler myMessageHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch(msg.what) {
case MyProgressBarDemo.STOP:
MyProgressBarDemo.this.myprobarA.setVisibility(View.GONE) ;
MyProgressBarDemo.this.myprobarB.setVisibility(View.GONE) ;
MyProgressBarDemo.this.myprobarC.setVisibility(View.GONE) ;
Thread.currentThread().interrupt() ;
break;
case MyProgressBarDemo.CONTINUE:
if (!Thread.currentThread().isInterrupted()) { // 线程没有中断
MyProgressBarDemo.this.myprobarA.setProgress(msg.arg1) ;
MyProgressBarDemo.this.myprobarB.setProgress(msg.arg1) ;
MyProgressBarDemo.this.myprobarC.setProgress(msg.arg1) ;
}
break;
}
}
} ;
}