android　动态渐变　字符效果

     public       class    GradientView    extends    View {
    private    String TAG    =       "   GradientView   "   ;
    private    Handler mTimeTickHandler;
    private       int    mIndex    =       190   ;
    private    Shader mShader;
    private    Bitmap mBitmapBg;
    private    Bitmap mBitmapWord;
    private       int    mMinWidth    =       190   ;
    private       int    mMaxWidth ;
    private       int    mUpdateStep    =       20   ;
    private    Paint mPaint    =       new    Paint();
    public    GradientView(Context context) {
    super   (context);
 }
 
    public    GradientView(Context context, AttributeSet attrs) {
    super   (context, attrs);
 mTimeTickHandler    =       new    Handler(); 
 setFocusable(   true   );
 InputStream is    =    context.getResources().openRawResource(R.drawable.sliding_channel_background);
 mBitmapBg    =    BitmapFactory.decodeStream(is); 
 mMaxWidth    =    mBitmapBg.getWidth();
 mBitmapWord    =    Bitmap.createBitmap(mBitmapBg.getWidth(), mBitmapBg.getHeight(), Bitmap.Config.ALPHA_8); 
 drawIntoBitmap(mBitmapWord, context);
 mTimeTickHandler.post(mTimeTickRunnable);
 }
 
    private       void    drawIntoBitmap(Bitmap bm, Context context) {
    float    x    =    bm.getWidth();
    float    y    =    bm.getHeight();
 Canvas c    =       new    Canvas(bm);
 Paint p    =       new    Paint();
 p.setAntiAlias(   true   );
 p.setColor(Color.WHITE);
 p.setTextSize(   45   ); 
 p.setTextAlign(Paint.Align.CENTER);
 c.drawText(context.getResources().getString(R.string.slide_unlock), x   /   2   +   10   , y   /   2   , p);
 }
 
 @Override
    protected       void    onDraw(Canvas canvas) {
 
    //   canvas.drawBitmap(mBitmapBg, 0, 0, p);   
    mPaint.setShader(mShader);
 canvas.drawBitmap(mBitmapWord,    50   ,    13   , mPaint);
 }
 
    public       void    removeHandlerGradient(){
 mTimeTickHandler.removeCallbacks(mTimeTickRunnable); 
 }
 
    private    Runnable mTimeTickRunnable    =       new    Runnable(){

    public       void    run() {
 
 mIndex    +=    mUpdateStep;
    if   (mIndex    >=    mMaxWidth){
 
 mIndex    =    mMinWidth;
 } 
 mShader    =       new    LinearGradient(   0   ,    150   , mIndex,    150   ,    new       int   [] { Color.GRAY,Color.GRAY,Color.GRAY, Color.GRAY,
 Color.WHITE },    null   , Shader.TileMode.MIRROR);
 
 postInvalidate();
 mTimeTickHandler.postDelayed(mTimeTickRunnable,    100   );
 } 
 };
}
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