<?xml version=”1.0″ encoding=”utf-8″?>
<layer-list xmlns:android=”http://schemas.android.com/apk/res/android” >

<!– ProgressBar的背景部分 –>
<item android:id=”@android:id/background”>
<shape>
<gradient
android:angle=”270″
android:endColor=”@color/FlatDarkCyan”
android:startColor=”@color/FlatLightCyan” />
</shape>
</item>
<!– 顯示ProgressBar進度的部分 –>
<item android:id=”@android:id/progress”>
<clip>
<shape>
<gradient
android:angle=”270″
android:endColor=”@color/FlatDarkBlue”
android:startColor=”@color/FlatLightBlue” />
</shape>
</clip>
</item>

</layer-list>

<?xml version=”1.0″ encoding=”utf-8″?>
<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android”
android:layout_width=”match_parent”
android:layout_height=”match_parent” >

<ProgressBar
android:id=”@+id/progressbar”
style=”?android:attr/progressBarStyleHorizontal”
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”
android:layout_centerInParent=”true”
android:indeterminate=”false”
android:max=”100″
android:progressDrawable=”@drawable/ch0106_pd_progress” />

<TextView
android:id=”@+id/textview”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_centerInParent=”true”
android:textColor=”@color/FlatLightWhite” />

</RelativeLayout>

package jp.co.se.android.recipe.chapter01;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ProgressBar;
import android.widget.TextView;

public class Ch0106 extends Activity {
private Handler mHandler = new Handler();
private int value = 0;
private ProgressBar mProgress;
private TextView mTextView;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ch0106_main);

mProgress = (ProgressBar) findViewById(R.id.progressbar);
mTextView = (TextView) findViewById(R.id.textview);

// 進度的值持續增加（演示範例用）
mHandler.post(addProgress);
}

@Override
protected void onDestroy() {
// 捨棄執行中的Handler
mHandler.removeCallbacksAndMessages(null);
super.onDestroy();
}

/**
* 進度的值每10ms增加
*/
private Runnable addProgress = new Runnable() {
@Override
public void run() {
value++;
if (value > 100) {
value = 0;
}
mProgress.setProgress(value);
mTextView.setText(value + “%”);
mHandler.postDelayed(addProgress, 10);
}
};
}