循环滚动TextView

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;

public class SlideTextView extends TextView implements Runnable {
    private int currentScrollX;
    private boolean isStop = false;
    private int textWidth;
    private boolean isMeasure = false;

    public SlideTextView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public SlideTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SlideTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub

        super.onDraw(canvas);
        if (!isMeasure) {
            getTextWidth();
            isMeasure = true;
        }
        Log.d("", "wmz:textWidth=" + textWidth);
    }

    private void getTextWidth() {
        Paint paint = this.getPaint();
        String str = this.getText().toString();
        textWidth = (int) paint.measureText(str);
    }

    @Override
    public void run() {
        Log.d("", "wmz:run-currentScrollX="+currentScrollX);
        currentScrollX -= 1;
        scrollTo(currentScrollX, 0);
        if (isStop) {
            return;
        }
        if (getScrollX() <= -(this.getWidth())) {
            scrollTo(textWidth, 0);
            currentScrollX = textWidth;
            // return;
        }
        postDelayed(this, 50);
    }

    public void startScroll() {
        isStop = false;
        this.removeCallbacks(this);
        post(this);
    }

    public void stopScroll() {
        isStop = true;
    }

    public void startFor0() {
        currentScrollX = 0;
        startScroll();
    }
}

SlideTextView textView = (SlideTextView) findViewById(R.id.text_slide);
textView.setText("123432432");
textView.startScroll();