1.阻尼效果listview
public class MyListView extends ListView implements Runnable {
private float mLastDownY = 0f;
private int mDistance = 0;
private int mStep = 10;
private boolean mPositive = false;
public MyListView (Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyListView (Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public MyListView (Context context) {
super(context);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (mLastDownY == 0f && mDistance == 0) {
mLastDownY = event.getY();
return true;
}
break;
case MotionEvent.ACTION_CANCEL:
break;
case MotionEvent.ACTION_UP:
if (mDistance != 0) {
mStep = 1;
mPositive = (mDistance >= 0);
this.post(this);
return true;
}
mLastDownY = 0f;
mDistance = 0;
break;
case MotionEvent.ACTION_MOVE:
if (mLastDownY != 0f) {
mDistance = (int) (mLastDownY - event.getY());
if ((mDistance < 0 && getFirstVisiblePosition() == 0 && getChildAt(0).getTop() == 0) || (mDistance > 0 && getLastVisiblePosition() == getCount() - 1)) {
mDistance /= 2;
scrollTo(0, mDistance);
return true;
}
}
mDistance = 0;
break;
}
return super.onTouchEvent(event);
}
public void run() {
mDistance += mDistance > 0 ? -mStep : mStep;
scrollTo(0, mDistance);
if ((mPositive && mDistance <= 0) || (!mPositive && mDistance >= 0)) {
scrollTo(0, 0);
mDistance = 0;
mLastDownY = 0f;
return;
}
mStep += 1;
this.postDelayed(this, 10);
}
}
2.阻尼效果 scrollview
public class CustomScrollView extends ScrollView {
private View inner;// 孩子View
private float y;// 点击时y坐标
private Rect normal = new Rect();// 矩形(这里只是个形式，只是用于判断是否需要动画.)
private boolean isCount = false;// 是否开始计算
private boolean isMoveing = false;// 是否开始移动.
private ImageView imageView;
private int initTop, initbottom;// 初始高度
private int top, bottom;// 拖动时时高度。
public void setImageView(ImageView imageView) {
this.imageView = imageView;
}
public CustomScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
/***
* 根据 XML 生成视图工作完成.该函数在生成视图的最后调用，在所有子视图添加完之后. 即使子类覆盖了 onFinishInflate
* 方法，也应该调用父类的方法，使该方法得以执行.
*/
@Override
protected void onFinishInflate() {
if (getChildCount() > 0) {
inner = getChildAt(0);
}
}
/** touch 事件处理 **/
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (inner != null) {
commOnTouchEvent(ev);
}
return super.onTouchEvent(ev);
}
/***
* 触摸事件
*
* @param ev
*/
public void commOnTouchEvent(MotionEvent ev) {
int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
top = initTop = imageView.getTop();
bottom = initbottom = imageView.getBottom();
break;
case MotionEvent.ACTION_UP:
isMoveing = false;
// 手指松开.
if (isNeedAnimation()) {
animation();
}
break;
/***
* 排除出第一次移动计算，因为第一次无法得知y坐标， 在MotionEvent.ACTION_DOWN中获取不到，
* 因为此时是MyScrollView的touch事件传递到到了LIstView的孩子item上面.所以从第二次计算开始.
* 然而我们也要进行初始化，就是第一次移动的时候让滑动距离归0. 之后记录准确了就正常执行.
*/
case MotionEvent.ACTION_MOVE:
final float preY = y;// 按下时的y坐标
float nowY = ev.getY();// 时时y坐标
int deltaY = (int) (nowY - preY);// 滑动距离
if (!isCount) {
deltaY = 0; // 在这里要归0.
}
if (deltaY < 0 && top <= initTop)
return;
// 当滚动到最上或者最下时就不会再滚动，这时移动布局
isNeedMove();
if (isMoveing) {
// 初始化头部矩形
if (normal.isEmpty()) {
// 保存正常的布局位置
normal.set(inner.getLeft(), inner.getTop(),
inner.getRight(), inner.getBottom());
}
// 移动布局
inner.layout(inner.getLeft(), inner.getTop() + deltaY / 3,
inner.getRight(), inner.getBottom() + deltaY / 3);
top += (deltaY / 6);
bottom += (deltaY / 6);
imageView.layout(imageView.getLeft(), top,
imageView.getRight(), bottom);
}
isCount = true;
y = nowY;
break;
default:
break;
}
}
/***
* 回缩动画
*/
public void animation() {
TranslateAnimation taa = new TranslateAnimation(0, 0, top + 200,
initTop + 200);
taa.setDuration(200);
imageView.startAnimation(taa);
imageView.layout(imageView.getLeft(), initTop, imageView.getRight(),
initbottom);
// 开启移动动画
TranslateAnimation ta = new TranslateAnimation(0, 0, inner.getTop(),
normal.top);
ta.setDuration(200);
inner.startAnimation(ta);
// 设置回到正常的布局位置
inner.layout(normal.left, normal.top, normal.right, normal.bottom);
normal.setEmpty();
isCount = false;
y = 0;// 手指松开要归0.
}
// 是否需要开启动画
public boolean isNeedAnimation() {
return !normal.isEmpty();
}
/***
* 是否需要移动布局 inner.getMeasuredHeight():获取的是控件的总高度
*
* getHeight()：获取的是屏幕的高度
*
* @return
*/
public void isNeedMove() {
int offset = inner.getMeasuredHeight() - getHeight();
int scrollY = getScrollY();
// Log.e("jj", "scrolly=" + scrollY);
// 0是顶部，后面那个是底部
if (scrollY == 0 || scrollY == offset) {
isMoveing = true;
}
}
}
public class RoundedImageView extends ImageView {
public RoundedImageView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public RoundedImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable == null) {
return;
}
if (getWidth() == 0 || getHeight() == 0) {
return;
}
Bitmap b = ((BitmapDrawable) drawable).getBitmap();
Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
int w = getWidth(), h = getHeight();
Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
canvas.drawBitmap(roundBitmap, 0, 0, null);
}
public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
Bitmap sbmp;
if (bmp.getWidth() != radius || bmp.getHeight() != radius)
sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);
else
sbmp = bmp;
Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(),
Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xffa19774;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.parseColor("#BAB399"));
canvas.drawCircle(sbmp.getWidth() / 2 + 0.7f,
sbmp.getHeight() / 2 + 0.7f, sbmp.getWidth() / 2 + 0.1f, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(sbmp, rect, rect, paint);
return output;
}
}比如 设置 imageview的 w，h
<com.example.view.RoundedImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:adjustViewBounds="true"
android:maxHeight="80dip"
android:maxWidth="80dip"
android:src="@drawable/aa" />
3.开关按钮（为了兼容版本）
public class SlidButton extends View implements OnTouchListener {
private boolean nowChoose = false;// 记录当前按钮是否打开，true为打开，false为关闭
private boolean onSlip = false;// 记录用户是否在滑动
private float downX, nowX; // 按下时的x，当前的x
private Rect btn_on, btn_off;// 打开和关闭状态下，游标的Rect
private boolean isChgLsnOn = false;//是否设置监听
private OnChangedListener changedLis;
int begin,end;//控件当前的位置
private Bitmap bg_on, bg_off, slip_btn;
public SlidButton(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public SlidButton(Context context) {
super(context);
init();
}
private void init() {
// 载入图片资源
bg_on = BitmapFactory.decodeResource(getResources(),
R.drawable.sild_bg_on1);
bg_off = BitmapFactory.decodeResource(getResources(),
R.drawable.sild_bg_off1);
slip_btn = BitmapFactory.decodeResource(getResources(),
R.drawable.sild_bg_btn1);
// 获得需要的Rect数据
btn_on = new Rect(0, 0, slip_btn.getWidth() , slip_btn.getHeight());
btn_off = new Rect(bg_off.getWidth() - slip_btn.getWidth(), 0,
bg_off.getWidth(), slip_btn.getHeight());
setOnTouchListener(this);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Matrix matrix = new Matrix();
begin =this.getWidth() - bg_off.getWidth();
end =9;
matrix.postTranslate(begin, end);
Paint paint = new Paint();
float x;
{
// if (nowX<(bg_on.getWidth()/2)) //滑动到前半段与后半段的背景不同,在此做判断
if(!nowChoose){
canvas.drawBitmap(bg_off, matrix, paint);//画出关闭时的背景
}else{
canvas.drawBitmap(bg_on, matrix, paint);//画出打开时的背景
}
if (onSlip) {//是否是在滑动状态,
if(nowX >= bg_on.getWidth()){
//是否划出指定范围,不能让游标跑到外头,必须做这个判断
x = bg_on.getWidth() - slip_btn.getWidth()/2;//减去游标1/2的长度
}else{
x = nowX - slip_btn.getWidth() / 2;
}
}else {
if(nowChoose)//根据现在的开关状态设置画游标的位置
x = btn_off.left;
else
x = btn_on.left;
}
if (x < 0 ) //对游标位置进行异常判断..
x = 0;
else if(x > bg_on.getWidth() - slip_btn.getWidth())
x = bg_on.getWidth() - slip_btn.getWidth();
canvas.drawBitmap(slip_btn, x + begin, end, paint);//画出游标.
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {//根据动作来执行代码
case MotionEvent.ACTION_MOVE:
nowX = event.getX();
break;
case MotionEvent.ACTION_DOWN:
if (event.getX() < begin)
return false;
onSlip = true;
downX = event.getX();
nowX = downX;
break;
case MotionEvent.ACTION_UP://松开
onSlip = false;
boolean lastChoose = nowChoose;
/*if (event.getX() >= begin+(bg_on.getWidth()/2))
nowChoose = true;
else
nowChoose = false; */
nowChoose =!nowChoose;
if(isChgLsnOn && (lastChoose != nowChoose))//如果设置了监听器,就调用其方法.
changedLis.OnChanged(nowChoose);
break;
default:
break;
}
invalidate();
return true;
}
public void SetOnChangedListener(OnChangedListener l){//设置监听器,当状态修改的时候
isChgLsnOn = true;
changedLis = l;
}
public interface OnChangedListener {
abstract void OnChanged(boolean checkState);
}
}
<com.view.SlidButton
android:layout_width="50dip"
android:layout_height="30dp"
/>