和圓形進度條(progressBarStyleLarge)。進度條用處很多,比如,應用程序裝載資源和網絡連接時,可以提示用戶稍等,這一類進度條只是代表應用程序中某一部分的執行情況,而整個應用程序執行情況呢,則可以通過應用程序標題欄來顯示一個進度條,這就需要先對窗口的顯示風格進行設置"requestWindowFeature(Window.FEATURE_PROGRESS)"。
先上佈局文件:
<?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"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
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>
ProgressBar01 爲長形進度條,Progress02爲圓形進度條,標題欄進度條沒有在這裏聲明。"style="表示設置進度條的風格。下面通過setMax方法設置進度條的最大值,setProgress 方法設置進度條的當前值,setVisibility 方法設置進度條的可見性。
package xiaohang.zhimeng;
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 xh_ProgressBar;
private ProgressBar xh_ProgressBar2;
private Button xh_Button;
protected static final int GUI_STOP_NOTIFIER = 0x108;
protected static final int GUI_THREADING_NOTIFIER = 0x109;
public int intCounter = 0;
@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);
//得到ProgressBar
xh_ProgressBar = (ProgressBar) findViewById(R.id.ProgressBar01);
xh_ProgressBar2 = (ProgressBar) findViewById(R.id.ProgressBar02);
xh_Button = (Button) findViewById(R.id.Button01);
//設置進度條 不爲 不確定模式
xh_ProgressBar.setIndeterminate(false);
xh_ProgressBar2.setIndeterminate(false);
//當按鈕按下時開始執行
xh_Button.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
//設置ProgressBar爲可見狀態
xh_ProgressBar.setVisibility(View.VISIBLE);
xh_ProgressBar2.setVisibility(View.VISIBLE);
//設置ProgressBar的最大值
xh_ProgressBar.setMax(100);
//設置ProgressBar當前值
xh_ProgressBar.setProgress(0);
xh_ProgressBar2.setProgress(0);
//通過線程來改變ProgressBar的值
new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 10; i++) {
try {
//設置進度值
intCounter = (i + 1) * 20;
//睡眠1000毫秒
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已經是最大值
case Activity01.GUI_STOP_NOTIFIER:
xh_ProgressBar.setVisibility(View.GONE);
xh_ProgressBar2.setVisibility(View.GONE);
Thread.currentThread().interrupted();
break;
case Activity01.GUI_THREADING_NOTIFIER:
if (!Thread.currentThread().isInterrupted()) {
//改變ProgressBar的當前值
xh_ProgressBar.setProgress(intCounter);
xh_ProgressBar2.setProgress(intCounter);
//設置標題欄中前景的一個進度條進度值
setProgress(intCounter * 100);
}
break;
}
super.handleMessage(msg);
}
};
}