下面我们把这个控件内嵌到Layout中做一些动画和展示，效果图:
这个子控件可以上下移动，可以左右滑动，如果上下滑动距离大于左右滑动距离，则必须上下滑动
这样来写onTouch事件:
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
int mScrollX = this.getScrollX();
final int action = ev.getAction();
final float x = ev.getX();
final float y = ev.getY();
switch (action) {
case MotionEvent.ACTION_DOWN:
mFlagLimitMove = false;
mFlagLimitUp = false;
/*
* If being flinged and user touches, stop the fling. isFinished
* will be false if being flinged.
*/
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
// Remember where the motion event started
mOriMotionX = x;
mOriMotionY = y;
mLastMotionX = x;
mLastMotionY = y;
mTimeDown = System.currentTimeMillis();
mLastDownX = x;
return true;
case MotionEvent.ACTION_MOVE:
//如果是往后滑动，屏幕向前，那么mLastMotionX是比x大的，deltaX是正的
int deltaX = (int) (mLastMotionX - x);
int deltaY = (int) (mLastMotionY - y);
// final int moveX = (int) (mOriMotionX - x);
final int moveY = (int) (mOriMotionY - y);
mLastMotionX = x;
mLastMotionY = y;
//X方向的移动更多
if (Math.abs(deltaY) < Math.abs(deltaX)) {
//虽然X方向移动更多，但由于已经判定为上下滑动，所以只能return true,做这种情况左右不能滑动
if (mFlagLimitUp) {
return true;
}
final int buffer = getWidth() / 2;
if (deltaX < 0) {
if (deltaX < -MOVEY_NUM_X) {
//mFlagLimitMove代表X方向确认在滑动了
mFlagLimitMove = true;
}
if (mCurrentScreen == 0 && !mExecuteWhileSnapOut) {
System.out.println("=====deltaX="+deltaX);
deltaX = getSlowDownDelta(deltaX);
System.out.println("=====after deltaX="+deltaX);
}
System.out.println("====mScrollX="+mScrollX+"buffer="+buffer+"deltaX="+deltaX+"x="+(Math.max(-mScrollX - buffer, deltaX)));
scrollBy(Math.max(-mScrollX - buffer, deltaX), 0);
// }
} else if (deltaX > 0) {
int availableToScroll = 0;
if (getChildCount() > 0) { //此时Workspace上可能未加任何item，count == 0
availableToScroll = getChildAt(
getChildCount() - 1).getRight()
- mScrollX - getWidth();
}
if (deltaX > MOVEY_NUM_X) {
mFlagLimitMove = true;
}
if (mCurrentScreen == getChildCount() - 1 && !mExecuteWhileSnapOut) {
deltaX = getSlowDownDelta(deltaX);
}
System.out.println("====availableToScroll="+availableToScroll+"deltaX="+deltaX);
scrollBy(Math.min(availableToScroll + buffer, deltaX), 0);
}
} else {
//如果已经判定为上下滑动或 ,当时X方向也有移动，这种情况也不处理
if (mFlagLimitMove || mFlagLimitUp) {
return true;
}
//deltaY>0说明为往上滑动
if (deltaY > 0 && moveY > MOVEY_NUM) {
if (mHandler != null) {
mFlagLimitUp = true;
mHandler.sendMessage(mHandler
.obtainMessage(DingLayout.MESSAGE_MOVING_UP));
}
} else if (deltaY < 0 && moveY < -MOVEY_NUM) {
if (mHandler != null) {
mFlagLimitUp = true;
mHandler.sendMessage(mHandler
.obtainMessage(DingLayout.MESSAGE_MOVING_DOWN));
}
}
}
return true;
case MotionEvent.ACTION_UP:
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(DEFAULT_VALUE,
mMaximumVelocity);
int velocityX = (int) velocityTracker.getXVelocity();
int velocityY = (int) velocityTracker.getYVelocity();
System.out.println("====mFlagLimitUp="+mFlagLimitUp+"mFlagLimitMove="+mFlagLimitMove);
if (!mFlagLimitUp) {
if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) {
// Fling hard enough to move left
snapToScreen(mCurrentScreen - 1);
} else if (velocityX < -SNAP_VELOCITY
&& mCurrentScreen < getChildCount() - 1) {
// Fling hard enough to move right
snapToScreen(mCurrentScreen + 1);
} else {
snapToDestination(mLastMotionX < mOriMotionX);
}
} else {
snapToDestination(mLastMotionX < mOriMotionX);
}
mTimeUp = System.currentTimeMillis();
//如果x方向移动非常少，并且没有y方向的移动，我们来判断是不是点击事件
if (!mFlagLimitUp && !mFlagLimitMove) {
// 如果点击时间比较短，而且手指没有移动很大位置，则认为为点击事件
if (Math.abs(x - mOriMotionX) < MOVE_LIMIT
&& Math.abs(y - mOriMotionY) < MOVE_LIMIT
&& Math.abs(mTimeUp - mTimeDown) < TIME_LIMIT) {
if (mHandler != null) {
mHandler.sendMessage(mHandler.obtainMessage(
DingLayout.MESSAGE_MOVING_CLICK, y));
return true;
}
}
if (velocityY > Y_RATE_LIMIT
&& Math.abs(velocityX) < X_RATE_LIMIT) {
if (mHandler != null) {
mHandler.sendMessage(mHandler
.obtainMessage(DingLayout.MESSAGE_MOVING_DOWN));
}
} else if (velocityY < -Y_RATE_LIMIT
&& Math.abs(velocityX) < X_RATE_LIMIT) {
if (mHandler != null) {
mHandler.sendMessage(mHandler
.obtainMessage(DingLayout.MESSAGE_MOVING_UP));
}
}
} // end flag
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
mFlagLimitMove = false;
mFlagLimitUp = false;
mTouchState = TOUCH_STATE_REST;
if (Math.abs(mLastDownX - x) > TEN) {
return true;
}
return false;
case MotionEvent.ACTION_CANCEL:
mTouchState = TOUCH_STATE_REST;
return false;
default:
break;
}
return true;
}布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/MainRoot"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@id/float_MainRoot" >
<ImageView
android:id="@+id/bgView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="centerCrop"
android:src="@drawable/search_bg5" />
<com.ringcentral.android.utils.ui.widget.DingLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/dinglayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="left|top"
android:background="#00000000" >
<RelativeLayout
android:id="@+id/ding_updown_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<com.ringcentral.android.utils.ui.widget.Workspace
android:id="@+id/workspace"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" />
<LinearLayout
android:id="@+id/dots_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/ding_view"
android:layout_centerHorizontal="true"
android:layout_marginRight="10dip"
android:layout_marginTop="10dip"
android:orientation="horizontal" />
</RelativeLayout>
</com.ringcentral.android.utils.ui.widget.DingLayout>
</RelativeLayout>
</LinearLayout>public class DingLayoutActivity extends Activity implements
OnViewChangedListener {
DingLayout mDingLayout;
Workspace mWorkspace;
/** 用inflater来载入layout. */
private LayoutInflater mInflater;
int mTotalDingnum;
ImageView mBtnRefresh;
private int mCurrentDownUrlIndex = 0;
public Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main1);
mDingLayout = (DingLayout) findViewById(R.id.dinglayout);
mDingLayout.setHandlerFormActivity(this.mHandler);
mWorkspace = (Workspace) findViewById(R.id.workspace);
mWorkspace.setOnViewChangedListener(this);
initialWorkspace();
}
/**
* 初始化workspace.
*/
private void initialWorkspace() {
mInflater = LayoutInflater.from(this);
// 该list为内存中的ding列表，列表中元素存储着ding的A部分数据
DingManager dingMgr = DingManager.getInstance(this);
List<DingInfo> list = dingMgr.getDingList();
mTotalDingnum = list.size();
// 遍历列表中的各个元素来构造workspace中的view
for (int i = 0; i < mTotalDingnum; i++) {
View view = mInflater.inflate(R.layout.ding_item, null);
DingInfo info = list.get(i);
view.setTag(info.getDingId());
String oldContent = info.getContent();
mWorkspace.addView(view);
mBtnRefresh = (ImageView) view.findViewById(R.id.btn_refresh);
setViewData(info, view, true);
info.setContent(oldContent);
// end modify
}
mDingLayout.updateDots(mTotalDingnum, mCurrentDownUrlIndex);
}
private void setViewData(DingInfo netdingdata, View view, boolean useTitle) {
if (view == null) {
return;
}
TextView title = (TextView) view.findViewById(R.id.title);
TextView content = (TextView) view.findViewById(R.id.main_content);
TextView description = (TextView) view.findViewById(R.id.description);
TextView time = (TextView) view.findViewById(R.id.time);
title.setText(netdingdata.getTitle());
// 默认值如果为空,不更新
String updateContent = netdingdata.getContent();
if (!TextUtils.isEmpty(updateContent)) {
// modify by qiaopu 用title的view
if (useTitle) {
title.setText(netdingdata.getContent());
content.setText("");
} else {
content.setText(netdingdata.getContent());
}
// end modify
}
description.setText(netdingdata.getDescription());
time.setText(netdingdata.getTime());
}
@Override
public void onViewChanged(int viewIndex) {
if (viewIndex < 0 || viewIndex >= mTotalDingnum) {
// Log.d(TAG, "invalid mCurrentDownUrlIndex");
return;
}
if (mCurrentDownUrlIndex != viewIndex) {
View view = mWorkspace.getChildAt(mCurrentDownUrlIndex);
if (view != null) {
}
mCurrentDownUrlIndex = viewIndex;
mDingLayout.updateDots(mTotalDingnum, mCurrentDownUrlIndex);
}
}
}
public class DingLayout extends RelativeLayout {
// /** Context */
// private Context mContext;
/** MESSAGE_MOVING_UP表示手势的动作为向上滑. */
public static final int MESSAGE_MOVING_UP = 0;
/** MESSAGE_MOVING_UP表示手势的动作为向下滑. */
public static final int MESSAGE_MOVING_DOWN = 1;
/** MESSAGE_MOVING_UP表示手势的动作为点击. */
public static final int MESSAGE_MOVING_CLICK = 2;
/** isUp为判断workspace是否在上方. */
private boolean mIsUp = false;
/** isUp为判断滑动的动画是否在进行中. */
private boolean mIsMove = false;
/** 可上下滑动的Layout，包括Workspace和点点提示。 */
private ViewGroup mUpDownLayout;
/** Workspace. */
private Workspace mSpace;
/** 点点提示Workspace当前页的Layout。 */
private LinearLayout mDotsLayout;
/** 点点的Y坐标偏移。由于点点需要显示在DING图标下面，而DING图标只有在Workspace的screen中才有，所以用此全局来计算并记住。 */
private int mDotsOffsetY;
/** 当前索引。 */
private int mCurrent = -1;
/** log tag. */
private static final String TAG = "DingLayout";
/** 动画运行时间. */
private static final int ANIMATIONTIME = 650;
/** mHandlerFromMainActivity从main activity传进来. */
private Handler mHandlerFromMainActivity;
/** 是否是动画进行中.*/
private boolean isRunning = false;
/** Context*/
private Context mContext = null;
/**
* view的构造函数.
*
* @param context
* context
* @param attrs
* attrs
*
*/
public DingLayout(Context context, AttributeSet attrs) {
super(context, attrs);
mIsUp = false;
isRunning = false;
mContext = context;
}
/**
* @return 为ding在上还是在底下的标识
*/
public boolean isUp() {
return mIsUp;
}
/**
* 把mainActivity的hander传入这个view.
* @param handlerFromMainActivity HandlerFromMainActivity
*/
public void setHandlerFormActivity(Handler handlerFromMainActivity) {
this.mHandlerFromMainActivity = handlerFromMainActivity;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
//如果在动画进行中，不进行event的分发
if (isRunning) {
return true;
}
return super.dispatchTouchEvent(ev);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
super.onLayout(changed, left, top, right, bottom);
//下面两句保证初始化时workspace的位置在上面或是在下面
if (mIsUp) {
layoutUp();
} else {
layoutDown();
}
if (mDotsOffsetY == 0) {
View dingView = findViewById(R.id.ding_view);
if (dingView != null) {
mDotsOffsetY = dingView.getBottom();
System.out.println("=====mDotsOffsetY="+mDotsOffsetY);
}
}
if (mDotsOffsetY > 0) {
//需要修改LayoutParams，否则在parent调用Layout的时候，坐标又会被改变。
LayoutParams params = (LayoutParams) mDotsLayout.getLayoutParams();
params.topMargin += mDotsOffsetY;
mDotsLayout.layout(mDotsLayout.getLeft(),
mDotsLayout.getTop() + mDotsOffsetY,
mDotsLayout.getRight(),
mDotsLayout.getBottom() + mDotsOffsetY);
//只需执行一次。
mDotsOffsetY = -1;
}
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mUpDownLayout = (ViewGroup) findViewById(R.id.ding_updown_layout);
mSpace = (Workspace) findViewById(R.id.workspace);
mSpace.setHandler(mHandler);
//<add by qumiao 2012.3.16 BEGIN
//fix bug: SEARHBOX-219 【二期】多个Ding的时候，左右滑动Ding的时候，显示ding位置的点点不应该随ding移动
mSpace.setSnapListener(new WorkspaceSnapListener() {
@Override
public void onSnapToScreen(Workspace workspace, int whichScreen) {
updateDots(getDingCount(), whichScreen);
}
});
//add by qumiao 2012.3.16 END>
mDotsLayout = (LinearLayout) findViewById(R.id.dots_layout);
}
/**
* 更新点点的状态，包括总数和当前位置。
* @param total 总数。
* @param current 当前位置。
*/
public void updateDots(int total, int current) {
Workspace.updateDots(mDotsLayout, total, current, null);
}
/**
* setCurrentScreen.
* @param index Index.
*/
public void setCurrentScreen(int index) {
mSpace.setCurrentScreen(index);
updateDots(getDingCount(), index);
}
/**
* set IsUp的值.
* @param isUp set mIsUp值
*/
public void setIsUp(boolean isUp) {
this.mIsUp = isUp;
}
/**
* 获取Ding的数量。
* @return 数量。
*/
private int getDingCount() {
List<DingInfo> list = DingManager.getInstance(getContext())
.getDingList();
return list.size();
}
/**
* 向上移的动画.
*/
private void moveUp() {
logCat("moveUp mToppanel.getWidth()=" + mUpDownLayout.getWidth()
+ "mToppanel.getHeight()=" + mUpDownLayout.getHeight());
layoutUp();
Animation upAnimation = new TranslateAnimation(0, 0,
getWorkSpaceDownPosition(), 0);
upAnimation.setDuration(ANIMATIONTIME);
upAnimation.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
mIsMove = true;
isRunning = true;
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
mIsMove = false;
isRunning = false;
if (mHandlerFromMainActivity != null) {
Message msg = mHandlerFromMainActivity.obtainMessage();
msg.what = SearchListener.MSG_ANIMATION_DONE;
mHandlerFromMainActivity.handleMessage(msg);
mHandlerFromMainActivity
.sendEmptyMessage(SearchListener.MSG_DING_UP_FINISHED);
mHandlerFromMainActivity
.sendEmptyMessage(SearchListener.MSG_DING_MOVE_UP);
}
}
});
if (mHandlerFromMainActivity != null) {
Message msg = mHandlerFromMainActivity.obtainMessage();
msg.what = SearchListener.MSG_ANIMATION_PREPARE;
mHandlerFromMainActivity.handleMessage(msg);
}
mUpDownLayout.startAnimation(upAnimation);
}
/**
* 向下移的动画.
*/
private void moveDown() {
if (mHandlerFromMainActivity != null) {
//<modified by qumiao 2012.2.15 BEGIN
//异步改成同步，以免影响动画效果。
// mHandlerFromMainActivity
// .sendEmptyMessage(SearchListener.MSG_DING_MOVE_DOWN);
Message msg = mHandlerFromMainActivity.obtainMessage();
msg.what = SearchListener.MSG_DING_MOVE_DOWN;
mHandlerFromMainActivity.handleMessage(msg);
//modified by qumiao END>
}
logCat("mToppanel.getWidth()=" + mUpDownLayout.getWidth()
+ "mToppanel.getHeight()=" + mUpDownLayout.getHeight());
layoutDown();
Animation downAnimation = new TranslateAnimation(0, 0,
-getWorkSpaceDownPosition(), 0);
downAnimation.setDuration(ANIMATIONTIME);
downAnimation.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
mIsMove = true;
isRunning = true;
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
mIsMove = false;
isRunning = false;
if (mHandlerFromMainActivity != null) {
Message msg = mHandlerFromMainActivity.obtainMessage();
msg.what = SearchListener.MSG_ANIMATION_DONE;
mHandlerFromMainActivity.handleMessage(msg);
}
}
});
if (mHandlerFromMainActivity != null) {
Message msg = mHandlerFromMainActivity.obtainMessage();
msg.what = SearchListener.MSG_ANIMATION_PREPARE;
mHandlerFromMainActivity.handleMessage(msg);
}
mUpDownLayout.startAnimation(downAnimation);
}
/**
* 上移。
*/
private void layoutUp() {
mUpDownLayout.layout(mUpDownLayout.getLeft(), 0, mUpDownLayout.getRight(),
mUpDownLayout.getHeight());
mUpDownLayout.setDrawingCacheEnabled(true);
mUpDownLayout.buildDrawingCache();
}
/**
* 下移。
*/
private void layoutDown() {
int workSpacePosition = getWorkSpaceDownPosition();
mUpDownLayout.layout(mUpDownLayout.getLeft(), workSpacePosition,
mUpDownLayout.getRight(), workSpacePosition + mUpDownLayout.getHeight());
mUpDownLayout.setDrawingCacheEnabled(false);
}
/**
* 获取workspace下移后的（top）position。
* @return position.
*/
private int getWorkSpaceDownPosition() {
//A部分的高度
int heightPartA = getResources().getDimensionPixelSize(R.dimen.browseraddview_height);
return getHeight() - heightPartA;
}
/**
* 打log用.
* @param log log
*/
private void logCat(String log) {
}
/**
* 处理动画的Handler.
*/
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
if (mIsMove) {
return;
}
switch (msg.what) {
case MESSAGE_MOVING_UP:
// top.setVisibility(View.GONE);
if (!mIsUp) {
mIsUp = true;
moveUp();
}
break;
case MESSAGE_MOVING_DOWN:
if (mIsUp) {
mIsUp = false;
// if(mHandler_fromActivity != null){
// mHandler_fromActivity.sendEmptyMessage(SearchListener.MSG_DING_MOVE_DOWN);
// }
moveDown();
}
break;
case MESSAGE_MOVING_CLICK:
Object obj = msg.obj;
Float t = (Float) obj;
int dingLayoutHeight = getResources().getDimensionPixelSize(R.dimen.browseraddview_height);
// t<ding_layout_height在ding_layout中点击才是有效的，在webview中点击是无效的
if (mIsUp && t < dingLayoutHeight) {
moveDown();
mIsUp = false;
} else if (t < dingLayoutHeight) {
moveUp();
mIsUp = true;
}
break;
default:
if (mHandlerFromMainActivity != null) {
mHandlerFromMainActivity.handleMessage(msg);
}
break;
}
}
};
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" tools:ignore="PxUsage"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/ding_part_a_background"
android:layout_width="fill_parent"
android:layout_height="@dimen/browseraddview_height"
android:background="@drawable/ding_rectangle"
/>
<View
android:id="@+id/ding_topline1"
android:layout_width="fill_parent"
android:layout_height="1px"
android:layout_alignParentTop="true"
android:background="#E5000000"
/>
<View
android:id="@+id/ding_topline2"
android:layout_width="fill_parent"
android:layout_height="1px"
android:layout_below="@+id/ding_topline1"
android:background="#19ffffff"
/>
<!-- 阿拉丁A部分显示4行文字 -->
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/ding_topline2"
android:layout_marginRight="50dip"
android:layout_marginLeft="10dip"
android:layout_marginTop="8dip"
style="@style/DingTypeFaceStyle"
android:textSize="18.6dip"
android:textColor="#ffffff"
android:text=""
/>
<TextView
android:id="@+id/main_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/title"
android:layout_marginLeft="10dip"
android:layout_marginTop="0dip"
style="@style/DingTypeFaceStyle"
android:textSize="32dip"
android:textColor="#ffffff"
android:text="数据加载中..."
/>
<TextView
android:id="@+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/main_content"
android:layout_marginLeft="10dip"
android:layout_marginTop="0dip"
style="@style/DingTypeFaceStyle"
android:textSize="13.3dip"
android:textColor="#ffffff"
android:text=""
/>
<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/description"
android:layout_marginLeft="10dip"
android:layout_marginTop="2dip"
style="@style/DingTypeFaceStyle"
android:textSize="10.6dip"
android:textColor="#ffffff"
android:text=""
/>
<!-- 阿拉丁A部分右侧的刷新按钮布局 -->
<ImageView
android:id="@+id/btn_refresh"
android:src="@drawable/trans_ding_refresh"
android:layout_height="38dip"
android:layout_width="38dip"
android:layout_alignParentRight="true"
android:layout_marginTop="5dip"
android:visibility="visible"
/>
<ProgressBar
android:id="@+id/progressrefresh"
android:layout_height="38dip"
android:layout_width="38dip"
android:layout_alignParentRight="true"
android:layout_marginTop="5dip"
android:visibility="invisible"
android:indeterminateDrawable="@anim/webview_loading_progressbar_anim"
/>
<ImageView
android:id="@+id/ding_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn_refresh"
android:layout_alignParentRight="true"
android:layout_marginRight="10dip"
android:layout_marginTop="16dip"
android:src="@drawable/ding_icon"
/>
<View
android:id="@+id/ding_part_b_background"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/ding_part_a_background"
android:background="@drawable/ding_rectangle"
/>
<TextView
android:id="@+id/app_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignTop="@+id/ding_part_b_background"
android:layout_marginTop="70dip"
android:textSize="24sp"
android:textColor="#7fffffff"
android:text="@string/app_name"
/>
<TextView
android:id="@+id/loading_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/app_name"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dip"
android:textSize="18sp"
android:textColor="#7fffffff"
android:text="正在加载，请稍候..."
/>
</RelativeLayout>
如果写一个android桌面滑动切换屏幕的控件(三),布布扣,bubuko.com
原文：http://blog.csdn.net/baidu_nod/article/details/38443499