自定义的VIEWGROUP要怎么添加子view？是不是要重写addView？

afairycell 2014-04-24 10:50:39
[code=javascript]
//viewgroup代码
public class MyScrollLayout extends ViewGroup {

private static final String TAG = "ScrollLayout";
private VelocityTracker mVelocityTracker;
private static final int SNAP_VELOCITY = 400;
private Scroller mScroller;
private int mCurScreen;
private int mDefaultScreen = 0;
private float mLastMotionX;
private float mLastMotionY;

private boolean isPass = false;

private OnViewChangeListener mOnViewChangeListener;
public MyScrollLayout(Context context) {
super(context);
// TODO Auto-generated constructor stub
init(context);
}
public MyScrollLayout(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
init(context);
}

public MyScrollLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
init(context);
}

private void init(Context context)
{
mCurScreen = mDefaultScreen;
// mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
mScroller = new Scroller(context);

}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// TODO Auto-generated method stub
if (changed) {
int childLeft = 0;
final int childCount = getChildCount();
for (int i=0; i<childCount; i++) {
final View childView = getChildAt(i);
if (childView.getVisibility() != View.GONE) {
final int childWidth = childView.getMeasuredWidth();
childView.layout(childLeft, 0,
childLeft+childWidth, childView.getMeasuredHeight());
childLeft += childWidth;
}
}
}
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int width = MeasureSpec.getSize(widthMeasureSpec);
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);

final int count = getChildCount();
for (int i = 0; i < count; i++) {
getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
}
scrollTo(mCurScreen * width, 0);
}

public void snapToDestination() {
final int screenWidth = getWidth();
final int destScreen = (getScrollX()+ screenWidth/2)/screenWidth;
snapToScreen(destScreen);
}

public void snapToScreen(int whichScreen) {
// get the valid layout page
whichScreen = Math.max(0, Math.min(whichScreen, getChildCount()-1));
if (getScrollX() != (whichScreen*getWidth())) {
final int delta = whichScreen*getWidth()-getScrollX();
mScroller.startScroll(getScrollX(), 0,
delta, 0, 300);

mCurScreen = whichScreen;
invalidate(); // Redraw the layout
if (mOnViewChangeListener != null)
{
mOnViewChangeListener.OnViewChange(mCurScreen);
}
}
}

@Override
public void computeScroll() {
// TODO Auto-generated method stub
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
}
}

@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
final int action = event.getAction();
final float x = event.getX();
final float y = event.getY();

switch (action) {
case MotionEvent.ACTION_DOWN:
System.out.println("父类点击onTouchEvent");
Log.i("", "onTouchEvent ACTION_DOWN");
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(event);
}
if (!mScroller.isFinished()){
mScroller.abortAnimation();
}
mLastMotionX = x;
mLastMotionY = y;
break;

case MotionEvent.ACTION_MOVE:
System.out.println("父类滑动onTouchEvent");
int deltaX = (int)(mLastMotionX - x);
if (IsCanMove(deltaX))
{
if (mVelocityTracker != null)
{
mVelocityTracker.addMovement(event);
}
mLastMotionX = x;
scrollBy(deltaX, 0);
}

break;
case MotionEvent.ACTION_UP:
System.out.println("父类放开onTouchEvent");
int velocityX = 0;
if (mVelocityTracker != null)
{
mVelocityTracker.addMovement(event);
mVelocityTracker.computeCurrentVelocity(1000);
velocityX = (int) mVelocityTracker.getXVelocity();
}
if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
// Fling enough to move left
Log.e(TAG, "snap left");
snapToScreen(mCurScreen - 1);
} else if (velocityX < -SNAP_VELOCITY
&& mCurScreen < getChildCount() - 1) {
// Fling enough to move right
Log.e(TAG, "snap right");
snapToScreen(mCurScreen + 1);
} else {
snapToDestination();
}

if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
// mTouchState = TOUCH_STATE_REST;
break;
}
return true;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
System.out.println("父类点击onInterceptTouchEvent");
if(isPass){
return true;
}
break;
case MotionEvent.ACTION_MOVE:
System.out.println("父类滑动onInterceptTouchEvent");
if(isPass){
return true;
}
break;
case MotionEvent.ACTION_UP:
System.out.println("父类放开onInterceptTouchEvent");
break;
}
return super.onInterceptTouchEvent(event);
}

@Override
public boolean dispatchTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastMotionX = event.getX();
mLastMotionY = event.getY();
System.out.println("父类点击dispatchTouchEvent");
break;
case MotionEvent.ACTION_MOVE:
System.out.println(Math.abs(event.getX()- mLastMotionX));
System.out.println(Math.abs(event.getY()- mLastMotionY));
double tanNum = Math.atan(Math.abs(event.getY()-mLastMotionY)/Math.abs(event.getX()- mLastMotionX));
double retote = tanNum/3.14*180;
System.out.println("角度:"+retote);
if (retote<45) {
System.out.println("---------父类滑动dispatchTouchEvent");
isPass= true;
}else{
isPass = false;
}
onInterceptTouchEvent(event);
System.out.println("***************"+isPass);
break;
case MotionEvent.ACTION_UP:
System.out.println("父类放开dispatchTouchEvent");
break;
}
return super.dispatchTouchEvent(event);
}

private boolean IsCanMove(int deltaX)
{
if (getScrollX() <= 0 && deltaX < 0 ){
return false;
}
if (getScrollX() >= (getChildCount() - 1) * getWidth() && deltaX > 0){
return false;
}
return true;
}

public void SetOnViewChangeListener(OnViewChangeListener listener)
{
mOnViewChangeListener = listener;
}
}
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afairycell 2014-04-24
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[/code] //在XML上加载子view
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/white"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/llayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

        <include layout="@layout/top1" />

        <include layout="@layout/top2" />
    </LinearLayout>

    <com.live.livebook.MyScrollLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/ScrollLayout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentBottom="true"
        android:layout_below="@id/llayout" >

        <!-- the first frame -->

        <com.live.livebook.MyFrame
            android:id="@+id/frame1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@color/white" >

            <ListView
                android:id="@+id/listView1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:cacheColorHint="@android:color/transparent"
                android:divider="@drawable/reader_item_divider"
                android:listSelector="@android:color/transparent" >
            </ListView>
        </com.live.livebook.MyFrame>
 <!-- 发现对应显示的界面 -->

        <FrameLayout
            android:id="@+id/frame2"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@color/white" >

            <include layout="@layout/discuss" />
        </FrameLayout>
        <!-- 通讯录显示的界面 -->

        <FrameLayout
            android:id="@+id/frame3"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@color/white" >

            <ListView
                android:id="@+id/listView2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:cacheColorHint="@android:color/transparent"
                android:divider="@drawable/reader_item_divider"
                android:listSelector="@android:color/transparent" >
            </ListView>
        </FrameLayout>
    </com.live.livebook.MyScrollLayout>

</RelativeLayout>
原代码是在XML加载，但是现在我是想手动加载，但是理解不好，添加一个子view总是程序崩溃，是不是要安装第一个view的排版之类的添加这个view？求高手指点
Fate- 2014-04-24
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引用 1 楼 afairycell 的回复:
[/code] //在XML上加载子view
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/white"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/llayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

        <include layout="@layout/top1" />

        <include layout="@layout/top2" />
    </LinearLayout>

    <com.live.livebook.MyScrollLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/ScrollLayout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentBottom="true"
        android:layout_below="@id/llayout" >

        <!-- the first frame -->

        <com.live.livebook.MyFrame
            android:id="@+id/frame1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@color/white" >

            <ListView
                android:id="@+id/listView1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:cacheColorHint="@android:color/transparent"
                android:divider="@drawable/reader_item_divider"
                android:listSelector="@android:color/transparent" >
            </ListView>
        </com.live.livebook.MyFrame>
 <!-- 发现对应显示的界面 -->

        <FrameLayout
            android:id="@+id/frame2"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@color/white" >

            <include layout="@layout/discuss" />
        </FrameLayout>
        <!-- 通讯录显示的界面 -->

        <FrameLayout
            android:id="@+id/frame3"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@color/white" >

            <ListView
                android:id="@+id/listView2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:cacheColorHint="@android:color/transparent"
                android:divider="@drawable/reader_item_divider"
                android:listSelector="@android:color/transparent" >
            </ListView>
        </FrameLayout>
    </com.live.livebook.MyScrollLayout>

</RelativeLayout>
原代码是在XML加载，但是现在我是想手动加载，但是理解不好，添加一个子view总是程序崩溃，是不是要安装第一个view的排版之类的添加这个view？求高手指点
+1
Android 手把手教您自定义ViewGroup（一）
代码为博客实例代码:http://blog.csdn.net/lmj623565791/article/details/38339817, 有问题请博客留言
自定义ViewGroup 显示两个TextView
自定义ViewGroup进一步学习，显示两个TextView到自定义控件中，对两个TextView进行布局
自定义ViewGroup实现拖动跟快速滚动的效果实例
自定义ViewGroup，根据手势滑动界面
自定义ViewGroup
这个demo主要讲解了自定义ViewGroup的其中的一种情况,动态的想ViewGroup中添加子控件.希望可以帮助需需要的同学.
自定义ViewGroup实现流式布局demo
自定义ViewGroup实现流式布局demo
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