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问题：Viewpager类替代Launcher中的worksapce,遇到焦点无法获得,求高手指点
描述:本帖最后由 jayson_jh 于 2012-05-28 14:19:37 编辑
最近在研究用Viewpager类替代Launcher中的worksapce,来达到多个屏幕平滑切换的效果,并且在桌面上直接显示所有的app图标.
如图所示:
但是碰到了一个问题,子view不能获得焦点.查询到需要重写两个函数:onRequestFocusInDescendants,addFocusables.
但重写后仍无法得到焦点,求解.
以下为涉及到的代码:
一个重写Viewpager的Workspace类.
public class Workspace extends ViewPager implements View.OnClickListener{
private ArrayList mGroupList = new ArrayList();
private static String TAG="Workspace";
private int mfocusableScreen=0;
public Workspace(Context context, AttributeSet attrs) {
super(context, attrs);
mGroupList.clear();
setAdapter(mPagerAdpter);
setOnPageChangeListener(new WorkspaceOnPageChangeListener());
}
//workspace data container
private PagerAdapter mPagerAdpter = new PagerAdapter() {
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View)arg1);
}
@Override
public int getCount() {
return mGroupList.size();
}
public Object instantiateItem(View view, int position) {
((ViewPager) view).addView(mGroupList.get(position));
CellLayout c = (CellLayout)((ViewPager) view).getChildAt(position);
if(c!=null){
int childNum = c.getChildCount();
for(int i=0;i<>
CounterTextView v = (CounterTextView)c.getChildAt(i);
v.setOnClickListener(Workspace.this);
}
}
return mGroupList.get(position);
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
};
@Override
public void destroyItem(View container, int position, Object object) {
((ViewPager) container).removeView((View) object);
};
};
PagerAdapter getPagerAdpter(){
return mPagerAdpter;
}
public void addItem(ViewGroup v){
mGroupList.add(v);
}
public void deleteItem(Object o){
mGroupList.remove(o);
}
public ViewGroup getChild(int index){
if(mGroupList.size()>=index){
return mGroupList.get(index);
}
return null;
}
@Override
public void onClick(View arg0) {
final CounterTextView view = (CounterTextView)arg0;
if(view instanceof CounterTextView)
Log.d(TAG, view.getText().toString());
}
@Override
protected boolean onRequestFocusInDescendants(int arg0, Rect arg1) {
//getChild(mfocusableScreen).requestFocus(arg0, arg1);
Log.d(TAG, "onRequestFocusInDescendants");
if(this.getChildCount()>0){
Log.d(TAG, "onRequestFocus screen="+mfocusableScreen);
getChildAt(mfocusableScreen).requestFocus(arg0, arg1);
}
return false;
}
@Override
public void addFocusables(ArrayList arg0, int direction, int arg2) {
// TODO Auto-generated method stub
Log.d(TAG, "addFocusables");
if(this.getChildCount()>0)
{
Log.d(TAG, "addFocusables for child");
getChildAt(mfocusableScreen).addFocusables(arg0, direction);
}
if (direction == View.FOCUS_LEFT) {
if (mfocusableScreen > 0) {
Log.d(TAG, "addFocusables for left page child");
getChildAt(mfocusableScreen - 1).addFocusables(arg0, direction);
}
} else if (direction == View.FOCUS_RIGHT){
if (mfocusableScreen < getChildCount() - 1) {
Log.d(TAG, "addFocusables for right page child");
getChildAt(mfocusableScreen + 1).addFocusables(arg0, direction);
}
}
}
@Override
protected void dispatchDraw(Canvas arg0) {
super.dispatchDraw(arg0);
}
class WorkspaceOnPageChangeListener implements OnPageChangeListener{
@Override
public void onPageScrollStateChanged(int arg0) {
//mGroupList.get(arg0).requestFocus();
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
//Log.d(TAG, "onPageScrolled arg0="+arg0+" arg2="+arg2);
}
@Override
public void onPageSelected(int arg0) {
mfocusableScreen =arg0;
Workspace.this.getChildAt(arg0).requestFocus();
}
}
}
ViewPager的初始化函数. CellLayout为Launcher的源码类,用于将ViewGroup 变味格状平均分布.
private void bindApplications() {
int paperSize = 4*4;
int paperNum = -1;
int counter=1;
int color=0xFFFF0000;
final int appSize = mApplications.size();
LayoutInflater layoutInflter=LayoutInflater.from(this);
if(mApplications.size()>0)
{
paperNum =appSize/paperSize;
paperNum = (appSize-paperNum*paperSize)>0? paperNum+1:paperNum;
Log.d(TAG_CLASS, "paperNum="+paperNum);
}
for(int i=0;i<>
CellLayout cl = (CellLayout)layoutInflter.inflate(R.layout.workspace_screen, null);
mWorkspace.addItem(cl);
final CellLayout cell = (CellLayout)mWorkspace.getChild(i);
if(cell==null)
Log.d(TAG_CLASS, "error");
if(cell instanceof CellLayout)
Log.d(TAG_CLASS, "GOod");
for(int j=i*16;j<>
{
ApplicationInfo ai = mApplications.get(j);
CellInfo ci = new CellInfo();
ci.spanX = 1;
ci.spanY = 1;
ci.screen = paperNum;
int row = (j-(i*16))/4;
int colunm = Math.abs(4*row -(j-(i*16)));
ci.cellX = row;
ci.cellY = colunm;
CounterTextView appText = (CounterTextView) layoutInflter.inflate(R.layout.application, cl, false);
appText.setCompoundDrawablesWithIntrinsicBounds(null, ai.icon, null, null);
appText.setText(ai.title);
appText.setTag(ai);
appText.setCounter(counter, color);
CellLayout.LayoutParams lp =(CellLayout.LayoutParams)cell.getLayoutParams();
if(lp ==null)
lp = new CellLayout.LayoutParams(ci.cellX, ci.cellY, 1, 1);
else
{
lp.cellX = ci.cellX;
lp.cellY = ci.cellY;
lp.cellHSpan = ci.spanX;
lp.cellVSpan = ci.spanY;
}
cell.addView(appText, -1, lp);
}
mWorkspace.getAdapter().notifyDataSetChanged();
mWorkspace.setCurrentItem(0);
}
}
以上介绍了“Viewpager类替代Launcher中的worksapce,遇到焦点无法获得,求高手指点”的问题解答，希望对有需要的网友有所帮助。
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