上滑解锁自定义View

public class PullDoorView extends RelativeLayout {

private Context mContext;

private Scroller mScroller;

private int mScreenHeight = 0;

private int mLastDownY = 0;

private int mCurryY;

private int mDelY;

private boolean mCloseFlag = false;

private TextView mTvHint;

private LockListen mLockListen;

public PullDoorView(Context context) {

super(context);

this.mContext = context;

initView();

}

public PullDoorView(Context context, AttributeSet attrs) {

super(context, attrs);

this.mContext = context;

initView();

}

public PullDoorView(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

this.mContext = context;

initView();

}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)

public PullDoorView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {

super(context, attrs, defStyleAttr, defStyleRes);

this.mContext = context;

initView();

}

private void initView() {

// Interpolator 设置插值器可弹跳

Interpolator polator = new BounceInterpolator();

mScroller = new Scroller(mContext, polator);

// 获取屏幕分辨率

WindowManager wm = (WindowManager) (mContext

.getSystemService(Context.WINDOW_SERVICE));

DisplayMetrics dm = new DisplayMetrics();

wm.getDefaultDisplay().getMetrics(dm);

mScreenHeight = dm.heightPixels;

// 这里你一定要设置成透明背景,不然会影响你看到底层布局

this.setBackgroundColor(Color.argb(0, 0, 0, 0));

Drawable drawableLeft = getResources().getDrawable(

R.drawable.ic_launcher);

mTvHint = new TextView(mContext);

LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

params.bottomMargin = (int) mContext.getResources().getDimension(R.dimen.y20); //这里我用到了自定义的屏幕适配可以改成其他长度类型的数值

params.addRule(RelativeLayout.CENTER_HORIZONTAL, -1);//-1 表示相对于父控件的位置

params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, -1);

mTvHint.setText("上滑解锁");

mTvHint.setTextColor(Color.WHITE);

mTvHint.setCompoundDrawablesWithIntrinsicBounds(null, null, drawableLeft, null);

mTvHint.setTextSize(16);

mTvHint.setBackgroundResource(R.color.transparent);

mTvHint.setGravity(Gravity.CENTER_VERTICAL);

mTvHint.setLayoutParams(params);

Animation ani = new AlphaAnimation(0.2f, 1f);

ani.setDuration(3000);

ani.setRepeatMode(Animation.REVERSE);

ani.setRepeatCount(Animation.INFINITE);

mTvHint.startAnimation(ani);

addView(mTvHint);

}

//设置提示文字

public void setText(String text) {

mTvHint.setText(text + "");

}

// 表层动画

public void startBounceAnim(int startY, int dy, int duration) {

mScroller.startScroll(0, startY, 0, dy, duration);

invalidate();//这里必须调用invalidate()才能保证computeScroll()会被调用，否则不一定会刷新界面，看不到滚动效果

}

@Override

public boolean onTouchEvent(MotionEvent event) {

int action = event.getAction();

switch (action) {

case MotionEvent.ACTION_DOWN:

mLastDownY = (int) event.getY();

return true;

case MotionEvent.ACTION_MOVE:

mCurryY = (int) event.getY();

mDelY = mCurryY - mLastDownY;

if (mDelY < 0) {

scrollTo(0, -mDelY);

}

break;

case MotionEvent.ACTION_UP:

mCurryY = (int) event.getY();

mDelY = mCurryY - mLastDownY;

if (mDelY < 0) {

if (Math.abs(mDelY) > mScreenHeight / 5) {

// 向上滑动超过一定高度的时候开启向上消失动画

startBounceAnim(this.getScrollY(), mScreenHeight, 450);

mCloseFlag = true;

} else {

// 向上滑动未超过半个屏幕高的时候开启向下弹动动画

startBounceAnim(this.getScrollY(), -this.getScrollY(), 1000);

mCloseFlag = false;

}

break;

}

return super.onTouchEvent(event);

}

@Override

public void computeScroll() {

super.computeScroll();

if (mScroller.computeScrollOffset()) {//判断滚动是否完成 true 表示动画还未完成

scrollTo(mScroller.getCurrX(), mScroller.getCurrY());

postInvalidate();

} else {

if (mCloseFlag) {

this.setVisibility(View.GONE);

}

@Override

protected void onVisibilityChanged(@NonNull View changedView, int visibility) {

if (visibility == GONE){

mCloseFlag = false;

mLockListen.unLock();

}else if(visibility == VISIBLE){

scrollTo(0,0);

}

super.onVisibilityChanged(changedView, visibility);

}

public void setLockListen(LockListen lockListen){

mLockListen = lockListen;

}

public interface LockListen{

void unLock();

}