本篇内容主要讲解“android如何实现滑动解锁”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“android如何实现滑动解锁”吧!
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效果图
需要用到的画笔， 整体灰色的背景， 滑块， 滑动之后绿色背景， 字体
mSliPaint = new Paint();
mSliPaint.setColor(Color.parseColor("#4a4c5b"));
mSliPaint.setAntiAlias(true);
mBgPaint = new Paint();
mBgPaint.setColor(Color.parseColor("#a6a6a6"));
mBgPaint.setAntiAlias(true);
mBluePaint = new Paint();
mBluePaint.setColor(Color.parseColor("#009496"));
mBluePaint.setAntiAlias(true);
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
mPaint.setTextSize(mTextSize);
//该方法即为设置基线上那个点究竟是left,center,还是right
mPaint.setTextAlign(Paint.Align.LEFT);在onDraw中绘制 mMovex为手指滑动的X坐标
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//背景色
RectF oval = new RectF(margin, margin, width - margin, height - margin);// 设置个新的长方形
canvas.drawRect(oval,mBgPaint);
//划过去背景色
RectF ovalBlue= new RectF(margin,margin,mMoveX+margin,mR*2+margin*3);
canvas.drawRect(ovalBlue,mBluePaint);
//文字
Paint.FontMetrics fontMetrics = mPaint.getFontMetrics();
float top = fontMetrics.top;//为基线到字体上边框的距离
float bottom = fontMetrics.bottom;//为基线到字体下边框的距离
int baseLineY = (int) (height / 2 - top / 2 - bottom / 2);//基线中间点的y轴计算公式
canvas.drawText(mText, mTextLeft, baseLineY, mPaint);
//滑块
RectF oval2 = new RectF(mMoveX+margin,margin,mMoveX+mR*3+margin*3,mR*2+margin*3);// 设置个新的长方形
canvas.drawRect(oval2,mSliPaint);//方形
//三个小箭头
Bitmap bitmap = BitmapFactory.decodeResource(this.getContext().getResources(), R.mipmap.arrow_right_small);
canvas.drawBitmap(bitmap,mMoveX+(mMoveX+mR*3+margin*3-mMoveX)/2-15,mR-margin,mSliPaint);
canvas.drawBitmap(bitmap,mMoveX+(mMoveX+mR*3+margin*3-mMoveX)/2,mR-margin,mSliPaint);
canvas.drawBitmap(bitmap,mMoveX+(mMoveX+mR*3+margin*3-mMoveX)/2+15,mR-margin,mSliPaint);
}onTouch中进行滑动监听 负值
@Override
public boolean onTouchEvent(MotionEvent event) {
// Log.e(event.getAction()+"");
// 点击是否在滑块上
if (event.getAction() != MotionEvent.ACTION_DOWN
&& !mSliderRect.contains((int) mStartX, (int) mStartY)) {
if (event.getAction() == MotionEvent.ACTION_UP
|| event.getAction() == MotionEvent.ACTION_CANCEL) {
mHandler.sendEmptyMessageDelayed(MSG_REDRAW, DRAW_INTERVAL);
}
return super.onTouchEvent(event);
}
acquireVelocityTrackerAndAddMovement(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mStartX = event.getX();
mStartY = event.getY();
mLastX = mStartX;
mHandler.removeMessages(MSG_REDRAW);
// L.e("按下");
Log.e("SlideU","按下");
break;
case MotionEvent.ACTION_MOVE:
Log.e("SlideU","移动");
mLastX = event.getX();
if (mLastX > mStartX) {
if (mLastX - mStartX > mSlidableLength) {
mLastX = mStartX + mSlidableLength;
mMoveX = mSlidableLength;
} else {
mMoveX = (int) (mLastX - mStartX);
}
} else {
mLastX = mStartX;
mMoveX = 0;
}
invalidate();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
Log.e("SlideU","超出或抬起");
mVelocityTracker.computeCurrentVelocity(1000, mMaxVelocity);
float velocityX = mVelocityTracker.getXVelocity();
Log.e("SlideU","速度"+velocityX);
if (mLastX - mStartX > mEffectiveLength || velocityX/2 > mEffectiveVelocity) {
startAnimator(mLastX - mStartX, mSlidableLength, velocityX, true);
} else {
startAnimator(mLastX - mStartX, 0, velocityX, false);
mHandler.sendEmptyMessageDelayed(MSG_REDRAW, DRAW_INTERVAL);
}
releaseVelocityTracker();
break;
}
return super.onTouchEvent(event);
}整体代码
public class LoadAwaySlideUnlockView extends View {
public interface UnlockListener {
void onLoadAwayUnlock();
}
private UnlockListener mUnlockListener;
public void setUnlockListener(UnlockListener unlockListener) {
mUnlockListener = unlockListener;
}
private static final int MSG_REDRAW = 1;
private static final int DRAW_INTERVAL = 50;
private static final int STEP_LENGTH = 10;//速度
private Paint mPaint;//文字的画笔
private Paint mSliPaint;//滑块画笔
private Paint mBgPaint;//背景画笔
private Paint mBluePaint;//划过去之后蓝色背景的画笔
private VelocityTracker mVelocityTracker;//滑动速度
private int mMaxVelocity;
private LinearGradient mGradient;//渐变色
private LinearGradient bgGradient;//背景渐变色
// private LinearGradient sliGradient;//滑块渐变色
// LinearGradient有两个构造函数;
//
// public LinearGradient(float x0, float y0, float x1, float y1, int[] colors, float[] positions,Shader.TileMode tile)
//
// 参数:
//
// float x0: 渐变起始点x坐标
//
// float y0:渐变起始点y坐标
//
// float x1:渐变结束点x坐标
//
// float y1:渐变结束点y坐标
//
// int[] colors:颜色 的int 数组
//
// float[] positions: 相对位置的颜色数组,可为null, 若为null,可为null,颜色沿渐变线均匀分布
//
// Shader.TileMode tile: 渲染器平铺模式
//
//
//
// public LinearGradient(float x0, float y0, float x1, float y1, int color0, int color1,Shader.TileMode tile)
//
// float x0: 渐变起始点x坐标
//
// float y0:渐变起始点y坐标
//
// float x1:渐变结束点x坐标
//
// float y1:渐变结束点y坐标
//
// int color0: 起始渐变色
// int color1: 结束渐变色
//
// Shader.TileMode tile: 渲染器平铺模式
private int[] mGradientColors;
private int[] bgGradientColors;
private int mGradientIndex;
private Interpolator mInterpolator;
private float mDensity;
private Matrix mMatrix;
private ValueAnimator mValueAnimator;
private int width;
private int height;
private String mText;//文字
private int mTextSize;//文字大小
private int mTextLeft;//文字距离左边
private int mR;//滑块的半径
private float margin;
private Rect mSliderRect;
private int mSlidableLength; // SlidableLength = BackgroundWidth - LeftMagins - RightMagins - SliderWidth
private int mEffectiveLength; // Suggested length is 20pixels shorter than SlidableLength
private float mEffectiveVelocity = 1000;//滑块自动回滚的速度
private float mStartX;
private float mStartY;
private float mLastX;
private float mMoveX;
public LoadAwaySlideUnlockView(Context context) {
this(context, null);
}
public LoadAwaySlideUnlockView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public LoadAwaySlideUnlockView(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public void setText(String text){
mText = text;
}
public LoadAwaySlideUnlockView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
mDensity = getResources().getDisplayMetrics().density;
ViewConfiguration configuration = ViewConfiguration.get(context);
mMaxVelocity = configuration.getScaledMaximumFlingVelocity();
mInterpolator = new AccelerateDecelerateInterpolator();
setClickable(true);
setFocusable(true);
setFocusableInTouchMode(true);
mSlidableLength = 200;
mTextSize = 30;//文字大小
mTextLeft = 10;//文字距离左边
mMoveX = 0;
mGradientIndex = 0;
mSliPaint = new Paint();
mSliPaint.setColor(Color.parseColor("#4a4c5b"));
mSliPaint.setAntiAlias(true);
mBgPaint = new Paint();
mBgPaint.setColor(Color.parseColor("#a6a6a6"));
mBgPaint.setAntiAlias(true);
mBluePaint = new Paint();
mBluePaint.setColor(Color.parseColor("#009496"));
mBluePaint.setAntiAlias(true);
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
mPaint.setTextSize(mTextSize);
//该方法即为设置基线上那个点究竟是left,center,还是right
mPaint.setTextAlign(Paint.Align.LEFT);
// mHandler.sendEmptyMessageDelayed(MSG_REDRAW, DRAW_INTERVAL);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int specWidthSize = MeasureSpec.getSize(widthMeasureSpec);//宽
int specHeightSize = MeasureSpec.getSize(heightMeasureSpec);//高
mMatrix = new Matrix();
width = specWidthSize;
height = specHeightSize;
mTextLeft = (int) (height * 1.5);
margin = height / 20;
mR = (int) (((height-margin*2) / 2)-margin);
//最大滑动距离
mSlidableLength = (int) (specWidthSize -(mMoveX+mR*3+margin*3-mMoveX+margin));
//有效距离
mEffectiveLength = mSlidableLength-20;
mSliderRect=new Rect((int)margin, (int)margin, 300, (int)(height - margin));
mGradientColors = new int[]{Color.argb(255, 120, 120, 120),
Color.argb(255, 120, 120, 120), Color.argb(255, 255, 255, 255)};
mGradient = new LinearGradient(0, 0, width/2, 0, mGradientColors,
new float[]{0, 0.7f, 1}, Shader.TileMode.MIRROR);
bgGradient = new LinearGradient(
0, 0, 0, (float) ((height)/2.0),
Color.argb(80, 0X77, 0X77, 0X77), Color.argb(200, 0X11, 0X11, 0X11),
Shader.TileMode.CLAMP
);
mHandler.removeMessages(MSG_REDRAW);
mHandler.sendEmptyMessageDelayed(MSG_REDRAW, DRAW_INTERVAL);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//背景色
RectF oval = new RectF(margin, margin, width - margin, height - margin);// 设置个新的长方形
canvas.drawRect(oval,mBgPaint);
//划过去背景色
RectF ovalBlue= new RectF(margin,margin,mMoveX+margin,mR*2+margin*3);
canvas.drawRect(ovalBlue,mBluePaint);
//文字
Paint.FontMetrics fontMetrics = mPaint.getFontMetrics();
float top = fontMetrics.top;//为基线到字体上边框的距离
float bottom = fontMetrics.bottom;//为基线到字体下边框的距离
int baseLineY = (int) (height / 2 - top / 2 - bottom / 2);//基线中间点的y轴计算公式
canvas.drawText(mText, mTextLeft, baseLineY, mPaint);
//滑块
RectF oval2 = new RectF(mMoveX+margin,margin,mMoveX+mR*3+margin*3,mR*2+margin*3);// 设置个新的长方形
canvas.drawRect(oval2,mSliPaint);//方形
//三个小箭头
Bitmap bitmap = BitmapFactory.decodeResource(this.getContext().getResources(), R.mipmap.arrow_right_small);
canvas.drawBitmap(bitmap,mMoveX+(mMoveX+mR*3+margin*3-mMoveX)/2-15,mR-margin,mSliPaint);
canvas.drawBitmap(bitmap,mMoveX+(mMoveX+mR*3+margin*3-mMoveX)/2,mR-margin,mSliPaint);
canvas.drawBitmap(bitmap,mMoveX+(mMoveX+mR*3+margin*3-mMoveX)/2+15,mR-margin,mSliPaint);
}
public void reset() {
if (mValueAnimator != null) {
mValueAnimator.cancel();
}
mMoveX = 0;
mPaint.setAlpha(255);
mHandler.removeMessages(MSG_REDRAW);
mHandler.sendEmptyMessageDelayed(MSG_REDRAW,200);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// Log.e(event.getAction()+"");
// 点击是否在滑块上
if (event.getAction() != MotionEvent.ACTION_DOWN
&& !mSliderRect.contains((int) mStartX, (int) mStartY)) {
if (event.getAction() == MotionEvent.ACTION_UP
|| event.getAction() == MotionEvent.ACTION_CANCEL) {
mHandler.sendEmptyMessageDelayed(MSG_REDRAW, DRAW_INTERVAL);
}
return super.onTouchEvent(event);
}
acquireVelocityTrackerAndAddMovement(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mStartX = event.getX();
mStartY = event.getY();
mLastX = mStartX;
mHandler.removeMessages(MSG_REDRAW);
// L.e("按下");
Log.e("SlideU","按下");
break;
case MotionEvent.ACTION_MOVE:
Log.e("SlideU","移动");
mLastX = event.getX();
if (mLastX > mStartX) {
if (mLastX - mStartX > mSlidableLength) {
mLastX = mStartX + mSlidableLength;
mMoveX = mSlidableLength;
} else {
mMoveX = (int) (mLastX - mStartX);
}
} else {
mLastX = mStartX;
mMoveX = 0;
}
invalidate();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
Log.e("SlideU","超出或抬起");
mVelocityTracker.computeCurrentVelocity(1000, mMaxVelocity);
float velocityX = mVelocityTracker.getXVelocity();
Log.e("SlideU","速度"+velocityX);
if (mLastX - mStartX > mEffectiveLength || velocityX/2 > mEffectiveVelocity) {
startAnimator(mLastX - mStartX, mSlidableLength, velocityX, true);
} else {
startAnimator(mLastX - mStartX, 0, velocityX, false);
mHandler.sendEmptyMessageDelayed(MSG_REDRAW, DRAW_INTERVAL);
}
releaseVelocityTracker();
break;
}
return super.onTouchEvent(event);
}
private void startAnimator(float start, float end, float velocity, boolean isRightMoving) {
if (velocity < mEffectiveVelocity) {
velocity = mEffectiveVelocity;
}
int duration = (int) (Math.abs(end - start) * 1000 / velocity);
mValueAnimator = ValueAnimator.ofFloat(start, end);
mValueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mMoveX = (Float) animation.getAnimatedValue();
invalidate();
}
});
mValueAnimator.setDuration(duration);
mValueAnimator.setInterpolator(mInterpolator);
if (isRightMoving) {
mValueAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
// L.e("解锁");
Log.e("SlideU","解锁");
if (mUnlockListener != null) {
mUnlockListener.onLoadAwayUnlock();
}
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
}
mValueAnimator.start();
}
private void acquireVelocityTrackerAndAddMovement(MotionEvent ev) {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
}
private void releaseVelocityTracker() {
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case MSG_REDRAW:
if(mMatrix==null){
mMatrix = new Matrix();
}
mMatrix.setTranslate(mGradientIndex, 0);
if(mGradient==null){
// L.e("mGradient空");
mGradientColors = new int[]{Color.argb(255, 120, 120, 120),
Color.argb(255, 120, 120, 120), Color.argb(255, 255, 255, 255)};
mGradient = new LinearGradient(0, 0, width/2, 0, mGradientColors,
new float[]{0, 0.7f, 1}, Shader.TileMode.MIRROR);
}
mGradient.setLocalMatrix(mMatrix);
invalidate();
mGradientIndex += STEP_LENGTH ;
if(mGradientIndex>=Integer.MAX_VALUE){
mGradientIndex = 0;
}
mHandler.sendEmptyMessageDelayed(MSG_REDRAW, DRAW_INTERVAL);
break;
}
}
};
}xml布局
activity中 添加提示文字和滑动监听即可
slideUnlock.setText("中间提示文字");
slideUnlock.setSlideListener(this);到此，相信大家对“android如何实现滑动解锁”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
