可滚动TextView

import android.content.Context;
import android.support.v7.widget.AppCompatTextView;
import android.text.method.ScrollingMovementMethod;
import android.util.AttributeSet;
import android.view.MotionEvent;

public class ScrollTextView extends AppCompatTextView {
    private final float mLastDefY = -1f;
    float mLastY;

    public ScrollTextView(Context context) {
        super(context);
        setMovementMethod(ScrollingMovementMethod.getInstance());
    }

    public ScrollTextView(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
        setMovementMethod(ScrollingMovementMethod.getInstance());
    }

    public ScrollTextView(Context context, AttributeSet attributeSet, int i) {
        super(context, attributeSet, i);
        setMovementMethod(ScrollingMovementMethod.getInstance());
    }

    public boolean onTouchEvent(MotionEvent motionEvent) {
        int action = motionEvent.getAction();
        if (action == 0) {
            this.mLastY = motionEvent.getY();
            getParent().requestDisallowInterceptTouchEvent(true);
        } else if (action == 2) {
            float y = motionEvent.getY() - this.mLastY;
            if (this.mLastY != mLastDefY) {
                if (y > 0.0f) {
                    this.mLastY = mLastDefY;
                    getParent().requestDisallowInterceptTouchEvent(canScrollVertically(-1));
                }
                if (y < 0.0f) {
                    this.mLastY = mLastDefY;
                    getParent().requestDisallowInterceptTouchEvent(canScrollVertically(1));
                }
            }
        } else if (action == 1 || action == 3) {
            getParent().requestDisallowInterceptTouchEvent(false);
        }
        return super.onTouchEvent(motionEvent);
    }
}