自定义listview工具类1、

public class ViewMeasureUtils {/*** 根据父 View 规则和子 View 的 LayoutParams，计算子类的宽度(width)测量规则** @param view*/public static int getChildWidthMeasureSpec(View view, int parentWidthMeasureSpec) {// 获取父 View 的测量模式int parentWidthMode = MeasureSpec.getMode(parentWidthMeasureSpec);// 获取父 View 的测量尺寸int parentWidthSize = MeasureSpec.getSize(parentWidthMeasureSpec);// 定义子 View 的测量规则int childWidthMeasureSpec = 0;// 获取子 View 的 LayoutParamsViewGroup.LayoutParams layoutParams = (ViewGroup.LayoutParams) view.getLayoutParams();if (parentWidthMode == MeasureSpec.EXACTLY || parentWidthMode == MeasureSpec.AT_MOST) {/* 这是当父类的模式是 dp 的情况 */if (layoutParams.width > 0) {childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(layoutParams.width, MeasureSpec.EXACTLY);} else if (layoutParams.width == ViewGroup.LayoutParams.WRAP_CONTENT) {childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(parentWidthSize, MeasureSpec.AT_MOST);} else if (layoutParams.width == ViewGroup.LayoutParams.MATCH_PARENT) {childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(parentWidthSize, MeasureSpec.EXACTLY);}} else if (parentWidthMode == MeasureSpec.UNSPECIFIED) {/* 这是当父类的模式是 MATCH_PARENT 的情况 */if (layoutParams.width > 0) {childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(layoutParams.width, MeasureSpec.EXACTLY);} else if (layoutParams.width == ViewGroup.LayoutParams.WRAP_CONTENT) {childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);} else if (layoutParams.width == ViewGroup.LayoutParams.MATCH_PARENT) {childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);}}// 返回子 View 的测量规则return childWidthMeasureSpec;}/*** 根据父 View 规则和子 View 的 LayoutParams，计算子类的宽度(width)测量规则** @param view*/public static int getChildHeightMeasureSpec(View view, int parentHeightMeasureSpec) {// 获取父 View 的测量模式int parentHeightMode = MeasureSpec.getMode(parentHeightMeasureSpec);// 获取父 View 的测量尺寸int parentHeightSize = MeasureSpec.getSize(parentHeightMeasureSpec);// 定义子 View 的测量规则int childHeightMeasureSpec = 0;// 获取子 View 的 LayoutParamsViewGroup.LayoutParams layoutParams = (ViewGroup.LayoutParams) view.getLayoutParams();if (parentHeightMode == MeasureSpec.EXACTLY || parentHeightMode == MeasureSpec.AT_MOST) {/* 这是当父类的模式是 dp 的情况 */if (layoutParams.height > 0) {childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(layoutParams.height, MeasureSpec.EXACTLY);} else if (layoutParams.height == ViewGroup.LayoutParams.WRAP_CONTENT) {childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(parentHeightSize, MeasureSpec.AT_MOST);} else if (layoutParams.width == ViewGroup.LayoutParams.MATCH_PARENT) {childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(parentHeightSize, MeasureSpec.EXACTLY);}} else if (parentHeightMode == MeasureSpec.UNSPECIFIED) {/* 这是当父类的模式是 MATCH_PARENT 的情况 */if (layoutParams.height > 0) {childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(layoutParams.height, MeasureSpec.EXACTLY);} else if (layoutParams.height == ViewGroup.LayoutParams.WRAP_CONTENT) {childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);} else if (layoutParams.height == ViewGroup.LayoutParams.MATCH_PARENT) {childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);}}// 返回子 View 的测量规则return childHeightMeasureSpec;}
}

自定义listview、

public class SlidingMenuVertical extends LinearLayout {
private Scroller mScroller;
private View view_top;
private View view_bottom;
private float downX;
private float downY;
private boolean opened = true;//状态是否开闭

private OnSwitchListener onSwitchListener;

private int duration_max = 300;//最长过度时间

private int ambit_scroll = 100;//滑动界限，开闭

private int y_opened = -1; // * y_opened:抽屉打开时view_bootom的top y

public SlidingMenuVertical(Context context) {
this(context, null);
}

public SlidingMenuVertical(Context context, AttributeSet attrs) {
super(context, attrs);
mScroller = new Scroller(context);
setOrientation(VERTICAL);
}

@Override
protected void onFinishInflate() {
// 当xml解析完成时的回调

view_top = getChildAt(0);
view_bottom = getChildAt(1);

}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);

view_top.measure(widthMeasureSpec, ViewMeasureUtils.getChildHeightMeasureSpec(view_top, heightMeasureSpec));

// view_middle.measure(widthMeasureSpec,ViewMeasureUtils.getChildHeightMeasureSpec(view_middle,heightMeasureSpec));
view_bottom.measure(widthMeasureSpec, heightMeasureSpec);

}

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {

setY_opened();
// 拦截
// 竖直滑动时，去拦截
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = event.getX();
downY = event.getY();

break;
case MotionEvent.ACTION_MOVE:
float moveX = event.getX();
float moveY = event.getY();
// 竖直滑动

if (Math.abs(moveY - downY) > Math.abs(moveX - downX)) {
//上面隐藏
if (opened == false) {

return false;
}

//上面显示并且下滑
if (opened == true && (moveY - downY) > 0) {

return false;
}

return true;
}
break;
case MotionEvent.ACTION_UP:
break;
default:
break;
}
return super.onInterceptTouchEvent(event);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = event.getX();
downY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
float moveX = event.getX();
float moveY = event.getY();

int dy = (int) (downY - moveY + 0.5f);// 四舍五入 20.9 + 0.5-->20

// Log.e("dy","++++++++++++++++++++++++++++"+dy);

int scrollY = getScrollY();
//mDownY - moveY>0上滑

if (scrollY + dy > 0) {
scrollBy(0, dy);
if (scrollY + dy > getHeight_top()) {
scrollTo(0, getHeight_top());
}
}

downX = moveX;
downY = moveY;

break;
case MotionEvent.ACTION_UP:
// Log.e("heigth_top", "+++++++++++++++++" + height_top);
// Log.e("scrollY", "+++++++++++++++++" + getScrollY());
if (opened) {

open(!(getScrollY() > ambit_scroll || getScrollY() > getHeight_top() / 3));

} else {

open(getScrollY() < getHeight_top() - ambit_scroll || getScrollY() < getHeight_top() * 2 / 3);

}

break;

}
// 消费掉
return true;
}

/**
* 开闭抽屉
*
* @param open
*/
public void open(boolean open) {
setY_opened();

this.opened = open;
//打开
if (open) {

// Log.e("打开", "+++++++++++++++++++++++++++++");

int startX = getScrollX();// 起始的坐标X
int startY = getScrollY();// 起始的坐标Y

int endX = 0;
int endY = 0;

int dx = endX - startX;// 增量X
int dy = endY - startY;// 增量Y
// 1px = 10
int duration = Math.abs(dy) * 10;
if (duration > duration_max) {
duration = duration_max;
}

mScroller.startScroll(startX, startY, dx, dy, duration);
} else {

Log.e("关闭", "+++++++++++++++++++++++++++++" + getScrollY());
int startX = getScrollX();// 起始的坐标X
int startY = getScrollY();// 起始的坐标Y

int endX = 0;
int endY = getHeight_top();

int dx = endX - startX;// 增量X
int dy = endY - startY;// 增量Y

// 1px = 10
int duration = Math.abs(dy) * 10;
if (duration > duration_max) {
duration = duration_max;
}

// 模拟数据变化
mScroller.startScroll(startX, startY, dx, dy, duration);
}

invalidate();// 触发ui绘制 --> draw() --> dispatchDraw()--> drawChild -->
}

@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {// 如果正在计算的过程中
// 更新滚动的位置
scrollTo(0, mScroller.getCurrY());
invalidate();
}

}

@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);

// Log.e("y_now", ScreenUtils.getViewScreenLocation(view_bottom)[1] + "++++++++++++++++++++++");
//
// Log.e("y_closed", y_opened - height_top + "++++++++++++++++++++++");

if (onSwitchListener != null) {
onSwitchListener.onSwitching(t - oldt < 0 ? true : false,
getY_now(), getY_opened(), getY_opened() - getHeight_top());
if (getY_now() == getY_opened()) {
// Log.e("true", "++++++++++++++++++++++++");
onSwitchListener.onSwitched(true);
}
if (getY_now() == getY_opened() - getHeight_top()) {
// Log.e("false", "++++++++++++++++++++++++");

onSwitchListener.onSwitched(false);
}

}
}

public boolean isOpened() {
return opened;
}

public int getDuration_max() {
return duration_max;
}

/**
* 设置松手后开闭最长过渡时间
*
* @param duration_max
*/
public void setDuration_max(int duration_max) {
this.duration_max = duration_max;
}

public View getView_top() {
return view_top;
}

public View getView_bottom() {
return view_bottom;
}

public int getHeight_top() {
return view_top.getMeasuredHeight();
}

/**
* 获取 * y_opened:抽屉打开时view_bootom的top y
*/
private void setY_opened(){

if (y_opened<0){

y_opened=getViewScreenLocation(view_bottom)[1];
Log.e("y _open",y_opened+"++++++++++++++++++++");
}
}
/**
* y_opened:抽屉打开时view_bootom的top y
*
* @return
*/
public int getY_opened() {
if (y_opened<0){
Log.e("还未计算出来","+++++++++++++++++++++++++++++++++++");
return 0;
}
return y_opened;
}

/**
* y_now:抽屉实时view_bootom的top y
*
* @return
*/
public int getY_now() {
return getViewScreenLocation(view_bottom)[1];
}

public int getAmbit_scroll() {
return ambit_scroll;
}

/**
* 修改滑动界限值，值越大开闭越难单位ms
*
* @param ambit_scroll <height_top
*/

public void setAmbit_scroll(int ambit_scroll) {
this.ambit_scroll = ambit_scroll;
}

/**
* 计算指定的 View 在屏幕中的坐标。
*/
public int[] getViewScreenLocation(View view) {
int[] location = new int[2];
// 获取控件在屏幕中的位置，返回的数组分别为控件左顶点的 x、y 的值
view.getLocationOnScreen(location);

return location;
}
public interface OnSwitchListener {

/*
滑动中
y_now:实时view_bottom的top y, y_opened:抽屉打开时view_bootom的top y,y_closed:抽屉关闭时view_bottom的top y top y:在屏幕中的top y坐标

*/
public void onSwitching(boolean isToOpen, int y_now, int y_opened, int y_closed);

/*
滑动停止，状态是否开闭
*/
public void onSwitched(boolean opened);
}

public void setOnSwitchListener(OnSwitchListener onSwitchListener) {
this.onSwitchListener = onSwitchListener;
}
}

2、activity实现代码，可打开可关闭抽屉动画，可监听动画距离——渐变效果

final TextView tv_middle = (TextView) findViewById(R.id.tv_middle);
final SlidingMenuVertical slidingMenuVertical = ((SlidingMenuVertical) findViewById(R.id.slidingMenu));
slidingMenuVertical.setDuration_max(2300);
slidingMenuVertical.setAmbit_scroll(100);
slidingMenuVertical.setOnSwitchListener(new SlidingMenuVertical.OnSwitchListener() {/*滑动中
y_now:实时view_bottom的top y, y_opened:抽屉打开时view_bootom的top y,y_closed:抽屉关闭时view_bottom的top y  top y:在屏幕中的top y坐标*/@Overridepublic void onSwitching(boolean isToOpen, int y_now, int y_opened, int y_closed) {tv_middle.setBackgroundColor(Color.argb((int) (1.0f * (y_opened - y_now) / (y_opened - y_closed) * 255),Color.red(0xff3F51B5), Color.green(0xff3F51B5), Color.blue(0xff3F51B5)));tv_middle.setTextColor(Color.argb((int) (1.0f * (y_opened - y_now) / (y_opened - y_closed) * 255),Color.red(0xffffffff), Color.green(0xffffffff), Color.blue(0xffffffff)));}@Overridepublic void onSwitched(boolean opened) {if (opened) {tv_middle.setBackgroundColor(0xffffffff);tv_middle.setTextColor(0xff454545);}}
});findViewById(R.id.tv_switch).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {slidingMenuVertical.open(!slidingMenuVertical.isOpened());}
});

3、layout.xml文件。

说明：SlidingMenuVertical里面第一个item就是抽屉内容——可以是view,可以是ViewGroup，第二个item就是抽屉下面的内容，第二个item里面ScrollView外部view可开关抽屉内容

<com.tianxin.choutis.SlidingMenuVerticalandroid:id="@+id/myct"android:layout_below="@+id/kgte"android:layout_width="match_parent"android:layout_height="wrap_content"><TextViewandroid:id="@+id/myte"android:layout_width="match_parent"android:layout_height="150dp"android:background="@color/colorAccent"android:text="Hello World!" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><TextViewandroid:id="@+id/tv_middle"android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center"android:textColor="#454545" /><ScrollViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:background="#e6e6e6"android:overScrollMode="never"android:scrollbars="vertical"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="下面\n下面\n下面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n下面\n" /></ScrollView></LinearLayout></com.tianxin.choutis.SlidingMenuVertical>

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Android 下拉式抽屉折叠动画

自定义listview工具类1、

自定义listview、

2、activity实现代码，可打开可关闭抽屉动画，可监听动画距离——渐变效果

3、layout.xml文件。

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