Android实现左滑关闭窗口
作者:UncleMin
这篇文章主要为大家详细介绍了Android实现左滑关闭窗口,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
前言
目前市场很多的APP都带有窗口滑动切换关闭,这种切换,使得用户操作比较爽,而且觉得功能点上也比较大气,在此就是自己总结了一个简易的方法,直接替换在基础窗口里面,使用安卓最基础的方法进行实现;
需求说明
1、首先是明确从哪里滑动:一般习惯都是从左边缘开始滑动
2、手指在滑动的时候页面进行移动
3、松开手指之后,要判断是否滑出关闭,还是恢复以前状态;
实现的代码
一、继承一个帧布局,重写方法:
public class ArActSlidLayout extends FrameLayout { // 页面边缘阴影的宽度默认值 private static final int SHADOW_WIDTH = 16; private Activity mActivity; private Scroller mScroller; //安卓自带的一个滑动计算的类,只做计算,不参与逻辑; // 页面边缘的阴影图 private Drawable mLeftShadow; // 页面边缘阴影的宽度 private int mShadowWidth; private int mInterceptDownX; //手指按下,拦截的x值 private int mLastInterceptX;//记录最后一次坐标 private int mLastInterceptY; private int mTouchDownX; //消费的x值 private int mLastTouchX; private int mLastTouchY; private boolean isConsumed = false;是否可以滑动 public ArActSlidLayout(Context context) { this(context, null); } public ArActSlidLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public ArActSlidLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(context); } private void initView(Context context) { mScroller = new Scroller(context); mLeftShadow = getResources().getDrawable(R.drawable.left_shadow);//得到阴影的图形 int density = (int) getResources().getDisplayMetrics().density; mShadowWidth = SHADOW_WIDTH * density;//得到实际像素的宽度; } /** * 绑定Activity */ public void bindActivity(Activity activity) { mActivity = activity; ViewGroup decorView = (ViewGroup) mActivity.getWindow().getDecorView(); View child = decorView.getChildAt(0); decorView.removeView(child); addView(child); decorView.addView(this);//把整个布局添加的窗口的ViewGroup中; } @Override public boolean onInterceptTouchEvent(MotionEvent ev) {//进行事件的是否拦截 boolean intercept = false; int x = (int) ev.getX(); int y = (int) ev.getY(); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: intercept = false; mInterceptDownX = x; mLastInterceptX = x; mLastInterceptY = y; break; case MotionEvent.ACTION_MOVE: int deltaX = x - mLastInterceptX; int deltaY = y - mLastInterceptY; // 手指处于屏幕边缘,且横向滑动距离大于纵向滑动距离时,拦截事件 if (mInterceptDownX < (getWidth() / 10) && Math.abs(deltaX) > Math.abs(deltaY)) { intercept = true;//满足这个条件进行拦截; } else { intercept = false; } mLastInterceptX = x; mLastInterceptY = y; break; case MotionEvent.ACTION_UP: intercept = false; mInterceptDownX = mLastInterceptX = mLastInterceptY = 0;//恢复数据; break; } //Log.e("event", " Intercep " + " x: " + x + " y: " + y); return intercept; } @Override public boolean onTouchEvent(MotionEvent ev) {//事件的消费,具体逻辑的编写; int x = (int) ev.getX(); int y = (int) ev.getY(); switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: mTouchDownX = x; mLastTouchX = x; mLastTouchY = y; //Log.e("event", " onTouchEventDOWN " + " x: " + x + " y: " + y); break; case MotionEvent.ACTION_MOVE: int deltaX = x - mLastTouchX; int deltaY = y - mLastTouchY; if (!isConsumed && mTouchDownX < (getWidth() / 10) && Math.abs(deltaX) > Math.abs(deltaY)) { isConsumed = true; //移动的条件 } if (isConsumed) { int rightMovedX = mLastTouchX - (int) ev.getX(); // 左侧即将滑出屏幕 if (getScrollX() + rightMovedX >= 0) { //移动到某一点 scrollTo(0, 0); } else { //相当于累加的移动 scrollBy(rightMovedX, 0); //手指滑动移动整个屏幕;负数:代表向右移动 ,反之,像做 } // Log.e("event", " onTouchEventMOVE " + " x: " + x + " y: " + y + " ScrollX: " + getScrollX() + " rightMovedX: " + rightMovedX); } mLastTouchX = x; mLastTouchY = y; break; case MotionEvent.ACTION_UP: isConsumed = false; mTouchDownX = mLastTouchX = mLastTouchY = 0; //消除数据; // 根据手指释放时的位置决定回弹还是关闭 if (-getScrollX() < getWidth() / 3) { scrollBack(); } else { scrollClose(); } //Log.e("event", " onTouchEventUP " + " x: " + x + " y: " + y + " ScrollX: " + getScrollX()); break; } //Log.e("event"," onTouchEventAll " + " getRawX(): "+ev.getRawX() +" y: " +ev.getRawY()); return true; } /** * 滑动返回 */ private void scrollBack() { int startX = getScrollX(); int dx = -getScrollX(); mScroller.startScroll(startX, 0, dx, 0, 300); invalidate(); } /** * 滑动关闭 */ private void scrollClose() { int startX = getScrollX(); int dx = -getScrollX() - getWidth(); //Log.e("event", " scrollClose: dx " + dx + " getWidth " + getWidth()); mScroller.startScroll(startX, 0, dx, 0, 300); invalidate(); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { scrollTo(mScroller.getCurrX(), 0); //Log.e("event", " computeScroll: " + mScroller.getCurrX()); postInvalidate(); } else if (-getScrollX() >= getWidth()) { mActivity.finish(); //Log.e("event", " computeScroll: finish " + getScrollX()); } } @Override protected void dispatchDraw(Canvas canvas) { super.dispatchDraw(canvas); drawShadow(canvas); } /** * 绘制边缘的阴影 */ private void drawShadow(Canvas canvas) { mLeftShadow.setBounds(0, 0, mShadowWidth, getHeight()); canvas.save(); canvas.translate(-mShadowWidth, 0); mLeftShadow.draw(canvas); canvas.restore(); } }
二、边缘的阴影left_shadow.xml:
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <!--颜色渐变范围--> <gradient android:endColor="#50000000" android:startColor="#00000000" /> </shape>
三、在baseActivity里面添加代码:
public class ArBaseFragActivity extends BaseMMCFragmentActivity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (setEnableSliding()) { ArActSlidLayout rootView = new ArActSlidLayout(this); rootView.bindActivity(this);//绑定需要窗口的布局: } } protected boolean setEnableSliding() {//默认返回是需要的,只需继承的时候重写次代码 true : 需要;false :不需要; return true; } }
四、总结:这种实现还有不少的方法,我这里只是推荐了自己觉得不错的方法,有需要的童鞋们直接copy项目中去用就行了,里面涉及到很多安卓自带的方法,还需要你们自己消化理解,我在实现代码中也进行了注释,可以帮助你们理解消化,有什么不足的地方,还请你们多多指教,使得我后期改进更多。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。