一、其中SwipeBackActivity 代码
public class SwipeBackActivity extends Activity {
protected SwipeBackLayout layout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
layout = (SwipeBackLayout) LayoutInflater.from(this).inflate(
R.layout.base, null);
layout.attachToActivity(this);
MyHorizontalScrollView.lock = false;
}
@Override
protected void onStart() {
super.onStart();
}
@Override
public void startActivity(Intent intent) {
super.startActivity(intent);
overridePendingTransition(R.anim.base_slide_right_in,
R.anim.base_slide_remain);
}
// Press the back button in mobile phone
@Override
public void onBackPressed() {
super.onBackPressed();
overridePendingTransition(0, R.anim.base_slide_right_out);
}
}
二、SwipeBackLayout
public class SwipeBackLayout extends FrameLayout {
private static final String TAG = SwipeBackLayout.class.getSimpleName();
private View mContentView;
private int mTouchSlop;
private int downX;
private int downY;
private int tempX;
private Scroller mScroller;
private int viewWidth;
private boolean isSilding;
private boolean isFinish;
private Drawable mShadowDrawable;
private Activity mActivity;
private List<ViewPager> mViewPagers = new LinkedList<ViewPager>();
public SwipeBackLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public SwipeBackLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
mScroller = new Scroller(context);
mShadowDrawable = getResources().getDrawable(R.drawable.shadow_left);
}
public void attachToActivity(Activity activity) {
mActivity = activity;
TypedArray a = activity.getTheme().obtainStyledAttributes(
new int[] { android.R.attr.windowBackground });
int background = a.getResourceId(0, 0);
a.recycle();
ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();
ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);
decorChild.setBackgroundResource(background);
decor.removeView(decorChild);
addView(decorChild);
setContentView(decorChild);
decor.addView(this);
}
private void setContentView(View decorChild) {
mContentView = (View) decorChild.getParent();
}
/**
* 事件拦截操作
*/
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// 处理ViewPager冲突问题
ViewPager mViewPager = getTouchViewPager(mViewPagers, ev);
if (MyHorizontalScrollView.lock || mViewPager != null
&& mViewPager.getCurrentItem() != 0) {
return super.onInterceptTouchEvent(ev);
}
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = tempX = (int) ev.getRawX();
downY = (int) ev.getRawY();
break;
case MotionEvent.ACTION_MOVE:
int moveX = (int) ev.getRawX();
// 满足此条件屏蔽SildingFinishLayout里面子类的touch事件
if (moveX - downX > mTouchSlop
&& Math.abs((int) ev.getRawY() - downY) < mTouchSlop) {
return true;
}
break;
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
int moveX = (int) event.getRawX();
int deltaX = tempX - moveX;
tempX = moveX;
if (moveX - downX > mTouchSlop
&& Math.abs((int) event.getRawY() - downY) < mTouchSlop) {
isSilding = true;
}
if (moveX - downX >= 0 && isSilding) {
mContentView.scrollBy(deltaX, 0);
}
break;
case MotionEvent.ACTION_UP:
isSilding = false;
if (mContentView.getScrollX() <= -viewWidth / 6) {
isFinish = true;
scrollRight();
} else {
scrollOrigin();
isFinish = false;
}
break;
}
return super.onTouchEvent(event);
}
/**
* 获取SwipeBackLayout里面的ViewPager的集合
*
* @param mViewPagers
* @param parent
*/
private void getAlLViewPager(List<ViewPager> mViewPagers, ViewGroup parent) {
int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
View child = parent.getChildAt(i);
if (child instanceof ViewPager) {
mViewPagers.add((ViewPager) child);
} else if (child instanceof ViewGroup) {
getAlLViewPager(mViewPagers, (ViewGroup) child);
}
}
}
/**
* 返回我们touch的ViewPager
*
* @param mViewPagers
* @param ev
* @return
*/
private ViewPager getTouchViewPager(List<ViewPager> mViewPagers,
MotionEvent ev) {
if (mViewPagers == null || mViewPagers.size() == 0) {
return null;
}
Rect mRect = new Rect();
for (ViewPager v : mViewPagers) {
v.getHitRect(mRect);
return v;
}
return null;
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
if (changed) {
viewWidth = this.getWidth();
getAlLViewPager(mViewPagers, this);
Log.i(TAG, "ViewPager size = " + mViewPagers.size());
}
}
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
if (mShadowDrawable != null && mContentView != null) {
int left = mContentView.getLeft()
- mShadowDrawable.getIntrinsicWidth();
int right = left + mShadowDrawable.getIntrinsicWidth();
int top = mContentView.getTop();
int bottom = mContentView.getBottom();
mShadowDrawable.setBounds(left, top, right, bottom);
mShadowDrawable.draw(canvas);
}
}
/**
* 滚动出界面
*/
private void scrollRight() {
final int delta = (viewWidth + mContentView.getScrollX());
// 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item
mScroller.startScroll(mContentView.getScrollX(), 0, -delta + 1, 0,
Math.abs(delta));
postInvalidate();
}
/**
* 滚动到起始位置
*/
private void scrollOrigin() {
int delta = mContentView.getScrollX();
mScroller.startScroll(mContentView.getScrollX(), 0, -delta, 0,
Math.abs(delta));
postInvalidate();
}
@Override
public void computeScroll() {
// 调用startScroll的时候scroller.computeScrollOffset()返回true，
if (mScroller.computeScrollOffset()) {
mContentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
if (mScroller.isFinished() && isFinish) {
mActivity.finish();
}
}
}
}
三、base.xml
<com.example.view.SwipeBackLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</com.example.view.SwipeBackLayout>
四、R.anim.base_slide_right_in、R.anim.base_slide_remain、base_slide_right_out
R.anim.base_slide_right_in
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="300"
android:fromXDelta="100.0%"
android:interpolator="@android:anim/decelerate_interpolator"
android:toXDelta="0.0%" />
</set>
R.anim.base_slide_remain
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="300"
android:fromXDelta="0"
android:interpolator="@android:anim/decelerate_interpolator"
android:toXDelta="0" />
</set>
R.anim.base_slide_right_out
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="300"
android:fromXDelta="0.0%"
android:interpolator="@android:anim/accelerate_interpolator"
android:toXDelta="100.0%" />
</set>
五、如何使用
直接在Activity里面继承SwipeBackActivity
当需要finish的时候使用
activity.finish();
activity.overridePendingTransition(R.anim.push_right_in,R.anim.push_right_out);