自定义TextView

public class MyTextView extends TextView {

Paint mpaint1;Paint mpaint2;Paint paint;private int mwidth;private LinearGradient gradient;private Matrix matrix;private int speedX;private int i = 0;public MyTextView(Context context) {    super(context);    this.init();}public MyTextView(Context context, @Nullable AttributeSet attrs) {    super(context, attrs);    this.init();}public MyTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    this.init();}private void init(){    this.mpaint1 = new Paint();    this.mpaint1.setColor(getResources().getColor(android.R.color.holo_blue_bright));    this.mpaint1.setStyle(Paint.Style.FILL);    this.mpaint2 = new Paint();    this.mpaint2.setColor(Color.YELLOW);    this.mpaint2.setStyle(Paint.Style.FILL);    this.speedX = 0;    this.mwidth = 0;}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {    super.onSizeChanged(w, h, oldw, oldh);    paint = getPaint();    mwidth = getMeasuredWidth();    //线性变换    this.gradient = new LinearGradient(0 ,            0 ,            mwidth ,            0,            new int[]{Color.BLUE , Color.RED, Color.GREEN},            null,            Shader.TileMode.CLAMP);    paint.setShader(this.gradient);    this.matrix = new Matrix();}@Overrideprotected void onDraw(Canvas canvas) {    //这段代码对应第一个图    canvas.drawRect(0            ,0            ,this.getMeasuredWidth()            ,this.getMeasuredHeight()            ,this.mpaint1);    canvas.drawRect(10 ,            10 ,            this.getMeasuredWidth() - 10,            this.getMeasuredHeight() - 10 ,            this.mpaint2);   canvas.save();    canvas.translate(0 , 10);    super.onDraw(canvas);    canvas.restore();//    }

}

//这段代码对应第二个动态图
if(this.matrix != null){
speedX += mwidth / 5;
if(speedX > 2 * mwidth)
speedX = -mwidth;
this.matrix.setTranslate(speedX , 0);
this.gradient.setLocalMatrix(matrix);

        //每个10ms重新调用onDraw 话界面

this.postInvalidateDelayed(10);
}