android加载中对话框,循环,透明

1、自定义对话框
public class HkDialogLoading extends Dialog {
	Context context;

	ImageView vLoading; // 圆型进度条
	Animation anim;// 动画

	public HkDialogLoading(Context context) {
		super(context, R.style.HKDialogLoading);
		this.context = context;
	}

	public void onCreate(Bundle savedInstanceState) {
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		requestWindowFeature(Window.PROGRESS_VISIBILITY_ON);
		super.onCreate(savedInstanceState);

		anim = AnimationUtils.loadAnimation(this.getContext(),
				R.anim.rotate_repeat);
		anim.setInterpolator(new LinearInterpolator());

		vLoading = new ImageView(context);
		vLoading.setImageResource(R.drawable.loading_icon);// 加载中的图片,建议圆形的

		// 布局
		FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
				FrameLayout.LayoutParams.MATCH_PARENT,
				FrameLayout.LayoutParams.WRAP_CONTENT);
		lp.gravity = Gravity.CENTER;

		addContentView(vLoading, lp);

		setCanceledOnTouchOutside(false);
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			// 按下了键盘上返回按钮
			this.hide();
			return true;
		}
		return false;
	}

	@Override
	public void show() {
		super.show();
		vLoading.startAnimation(anim);
	}
}

2、用到的动画文件rotate_repeat (在res/anim目录下面建文件rotate_repeat.xml)
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator" >
    <rotate
        android:duration="1000"
        android:fromDegrees="0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:repeatCount="100"
        android:repeatMode="restart"
        android:toDegrees="360" />
</set>

3、用的到的样式文件 (在res/values目录下的style.xml文件中的<resources>节点下添加下面的代码)
<style name="HKDialogLoading" parent="@android:style/Theme.Dialog">
	<item name="android:windowFrame">@null</item>
	<item name="android:windowNoTitle">true</item>
	<item name="android:windowBackground">@color/transparent</item>
	<item name="android:windowIsFloating">true</item>
	<item name="android:windowContentOverlay">@null</item>
</style>

4、调用
dialogLoading = new HKDialogLoading(this);
dialogLoading.show(); // 显示加载中对话框