Android 高級控件學習--ProgressBar
佈局文件main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<ProgressBar
android:id="@+id/ProgressBar01"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:visibility="gone"
/>
<ProgressBar
android:id="@+id/ProgressBar02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleLarge"
android:max="100"
android:progress="50"
android:secondaryProgress="70"
android:visibility="gone"
/>
<Button
android:id="@+id/Button01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="開始" />
</LinearLayout>
源文件Activity01.java
package com.lxt008;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.ProgressBar;
public class Activity01 extends Activity
{
//聲明ProgressBar對象
private ProgressBar m_ProgressBar;
private ProgressBar m_ProgressBar2;
private Button mButton01;
protected static final int GUI_STOP_NOTIFIER = 0x108;
protected static final int GUI_THREADING_NOTIFIER = 0x109;
public int intCounter=0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//設置窗口模式,,因爲需要顯示進度條在標題欄
requestWindowFeature(Window.FEATURE_PROGRESS);
setProgressBarVisibility(true);
setContentView(R.layout.main);
//取得ProgressBar
m_ProgressBar = (ProgressBar) findViewById(R.id.ProgressBar01);
m_ProgressBar2= (ProgressBar) findViewById(R.id.ProgressBar02);
mButton01 = (Button)findViewById(R.id.Button01);
m_ProgressBar.setIndeterminate(false);
m_ProgressBar2.setIndeterminate(false);
//當按鈕按下時開始執行,
mButton01.setOnClickListener(new Button.OnClickListener()
{
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
//設置ProgressBar爲可見狀態
m_ProgressBar.setVisibility(View.VISIBLE);
m_ProgressBar2.setVisibility(View.VISIBLE);
//設置ProgressBar的最大值
m_ProgressBar.setMax(100);
//設置ProgressBar當前值
m_ProgressBar.setProgress(0);
m_ProgressBar2.setProgress(0);
//通過線程來改變ProgressBar的值
new Thread(new Runnable() {
public void run()
{
for (int i = 0; i < 10; i++)
{
try
{
intCounter = (i + 1) * 20;
Thread.sleep(1000);
if (i == 4)
{
Message m = new Message();
m.what = Activity01.GUI_STOP_NOTIFIER;
Activity01.this.myMessageHandler.sendMessage(m);
break;
}
else
{
Message m = new Message();
m.what = Activity01.GUI_THREADING_NOTIFIER;
Activity01.this.myMessageHandler.sendMessage(m);
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
}).start();
}
});
}
Handler myMessageHandler = new Handler()
{
// @Override
public void handleMessage(Message msg)
{
switch (msg.what)
{
//ProgressBar已經是對大值
case Activity01.GUI_STOP_NOTIFIER:
m_ProgressBar.setVisibility(View.GONE);
m_ProgressBar2.setVisibility(View.GONE);
Thread.currentThread().interrupt();
break;
case Activity01.GUI_THREADING_NOTIFIER:
if (!Thread.currentThread().isInterrupted())
{
// 改變ProgressBar的當前值
m_ProgressBar.setProgress(intCounter);
m_ProgressBar2.setProgress(intCounter);
// 設置標題欄中前景的一個進度條進度值
setProgress(intCounter*100);
// 設置標題欄中後面的一個進度條進度值
setSecondaryProgress(intCounter*100);//
}
break;
}
super.handleMessage(msg);
}
};
}
一、xml中style屬性爲ProgressBar的樣式風格
Android的ProgressBar樣式:
style="?android:attr/progressBarStyleHorizontal" 長形進度條
style="?android:attr/progressBarStyleLarge" 超大號圓形
style="?android:attr/progressBarStyleSmall" 小號圓形
style="?android:attr/progressBarStyleSmallTitle" 標題型圓形
二、源文件中requestWindowFeature可以設置的值有:
1.DEFAULT_FEATURES:系統默認狀態,一般不需要指定
2.FEATURE_CONTEXT_MENU:啓用ContextMenu,默認該項已啓用,一般無需指定
3.FEATURE_CUSTOM_TITLE:自定義標題。當需要自定義標題時必須指定。如:標題是一個按鈕時
4.FEATURE_INDETERMINATE_PROGRESS:不確定的進度
5.FEATURE_LEFT_ICON:標題欄左側的圖標
6.FEATURE_NO_TITLE:無標題
7.FEATURE_OPTIONS_PANEL:啓用“選項面板”功能,默認已啓用。
8.FEATURE_PROGRESS:進度指示器功能
9.FEATURE_RIGHT_ICON:標題欄右側的圖標
三、源文件中m_ProgressBar.setVisibility(View.VISIBLE);
setVisibility有三個參數:
VISIBLE:0 意思是可見的
INVISIBILITY:4 意思是不可見的,但還佔着原來的空間
GONE:8 意思是不可見的,不佔用原來的佈局空間
四、源文件中設置ProgressBar相關字段
m_ProgressBar.setMax(100);//設置ProgressBar最大值
m_ProgressBar.setProgress(0);//設置ProgressBar當前值
五、線程
new Thread(new Runnable() {
public void run()
{
//try to do
}
}).start();
六、Handle與Message暫緩,暫時看做windowsapi裏的Sendmessage