ProgressBar中两种显示图片的设置代码

自己用，省得每次用的时候自己找。而且对几种Drawable  诠释的挺好

<style name="Widget.ProgressBar.Horizontal">
<item name="android:indeterminateOnly">false</item>
<item name="android:progressDrawable">@android:drawable/progress_horizontal</item>
<item name="android:indeterminateDrawable">@android:drawable/progress_indeterminate_horizontal</item>
<item name="android:minHeight">20dip</item>
<item name="android:maxHeight">20dip</item>
</style>

<!--progress_horizontal-->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

<item android:id="@android:id/background">
<shape>
<corners android:radius="5dip" />
<gradient
android:startColor="#ff9d9e9d"
android:centerColor="#ff5a5d5a"
android:centerY="0.75"
android:endColor="#ff747674"
android:angle="270"
/>
</shape>
</item>

<item android:id="@android:id/secondaryProgress">
<clip>
<shape>
<corners android:radius="5dip" />
<gradient
android:startColor="#80ffd300"
android:centerColor="#80ffb600"
android:centerY="0.75"
android:endColor="#a0ffcb00"
android:angle="270"
/>
</shape>
</clip>
</item>

<item android:id="@android:id/progress">
<clip>
<shape>
<corners android:radius="5dip" />
<gradient
android:startColor="#ffffd300"
android:centerColor="#ffffb600"
android:centerY="0.75"
android:endColor="#ffffcb00"
android:angle="270"
/>
</shape>
</clip>
</item>

</layer-list>

<!--progress_indeterminate_horizontal-->
<animation-list
xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false">
<item android:drawable="@drawable/progressbar_indeterminate1" android:duration="200" />
<item android:drawable="@drawable/progressbar_indeterminate2" android:duration="200" />
<item android:drawable="@drawable/progressbar_indeterminate3" android:duration="200" />
</animation-list>

两个Drawable解析以及设置一样
drawable = a.getDrawable(R.styleable.ProgressBar_indeterminateDrawable);

        if (drawable != null) {

            drawable = tileifyIndeterminate(drawable);

            setIndeterminateDrawable(drawable);

        }

/**
* Convert a AnimationDrawable for use as a barberpole animation.
* Each frame of the animation is wrapped in a ClipDrawable and
* given a tiling BitmapShader.
*/
private Drawable tileifyIndeterminate(Drawable drawable) {
if (drawable instanceof AnimationDrawable) {
AnimationDrawable background = (AnimationDrawable) drawable;
final int N = background.getNumberOfFrames();
AnimationDrawable newBg = new AnimationDrawable();
newBg.setOneShot(background.isOneShot());

for (int i = 0; i < N; i++) {
Drawable frame = tileify(background.getFrame(i), true);
frame.setLevel(10000);
newBg.addFrame(frame, background.getDuration(i));
}
newBg.setLevel(10000);
drawable = newBg;
}
return drawable;
}

/**
* Converts a drawable to a tiled version of itself. It will recursively
* traverse layer and state list drawables.
*/
private Drawable tileify(Drawable drawable, boolean clip) {

if (drawable instanceof LayerDrawable) {
LayerDrawable background = (LayerDrawable) drawable;
final int N = background.getNumberOfLayers();
Drawable[] outDrawables = new Drawable
;

for (int i = 0; i < N; i++) {
int id = background.getId(i);
outDrawables[i] = tileify(background.getDrawable(i),
(id == R.id.progress || id == R.id.secondaryProgress));
}

LayerDrawable newBg = new LayerDrawable(outDrawables);

for (int i = 0; i < N; i++) {
newBg.setId(i, background.getId(i));
}

return newBg;

} else if (drawable instanceof StateListDrawable) {
StateListDrawable in = (StateListDrawable) drawable;
StateListDrawable out = new StateListDrawable();
int numStates = in.getStateCount();
for (int i = 0; i < numStates; i++) {
out.addState(in.getStateSet(i), tileify(in.getStateDrawable(i), clip));
}
return out;

} else if (drawable instanceof BitmapDrawable) {
final Bitmap tileBitmap = ((BitmapDrawable) drawable).getBitmap();
if (mSampleTile == null) {
mSampleTile = tileBitmap;
}

final ShapeDrawable shapeDrawable = new ShapeDrawable(getDrawableShape());

final BitmapShader bitmapShader = new BitmapShader(tileBitmap,
Shader.TileMode.REPEAT, Shader.TileMode.CLAMP);
shapeDrawable.getPaint().setShader(bitmapShader);

return (clip) ? new ClipDrawable(shapeDrawable, Gravity.LEFT,
ClipDrawable.HORIZONTAL) : shapeDrawable;
}

return drawable;
}