Question

所以我有一个ExpandableListView，在子视图中我有一个ListView。当我点击其中一个项目时，它会打开另一个活动。当我按下并单击另一个列表项时，会出现问题。当我这样做时，我得到了提到的例外。我从不使用位图，所以我真的不知道是什么原因引起了问题，是重新绘制项目的问题还是？

我读（参考Caching Bitmaps）我应该实现一个缓存机制，但我不知道如何启动，如果不使用任何位图我应该缓存什么？我在这里缺少什么？

Logcat：

09-10 05:48:03.345: E/AndroidRuntime(21011): FATAL EXCEPTION: main
09-10 05:48:03.345: E/AndroidRuntime(21011): java.lang.IllegalArgumentException: Cannot    draw recycled bitmaps
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.GLES20Canvas.drawBitmap(GLES20Canvas.java:789)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.GLES20RecordingCanvas.drawBitmap(GLES20RecordingCanvas.java:118)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.graphics.drawable.BitmapDrawable.draw(BitmapDrawable.java:393)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.widget.ImageView.onDraw(ImageView.java:967)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13707)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12645)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12689)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13423)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12643)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12689)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13423)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13710)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.widget.FrameLayout.draw(FrameLayout.java:467)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.widget.ScrollView.draw(ScrollView.java:1576)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12645)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12689)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13423)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13710)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.widget.FrameLayout.draw(FrameLayout.java:467)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.widget.HorizontalScrollView.draw(HorizontalScrollView.java:1562)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12645)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12689)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13423)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12643)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12689)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13423)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12643)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12689)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13423)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12643)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12689)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13423)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.draw(View.java:13710)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.widget.FrameLayout.draw(FrameLayout.java:467)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2211)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12645)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.View.getDisplayList(View.java:12689)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:1198)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewRootImpl.draw(ViewRootImpl.java:2173)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2045)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1854)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.Choreographer.doCallbacks(Choreographer.java:562)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.Choreographer.doFrame(Choreographer.java:532)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.os.Handler.handleCallback(Handler.java:725)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.os.Handler.dispatchMessage(Handler.java:92)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.os.Looper.loop(Looper.java:137)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at android.app.ActivityThread.main(ActivityThread.java:5191)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at java.lang.reflect.Method.invokeNative(Native Method)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at java.lang.reflect.Method.invoke(Method.java:511)
09-10 05:48:03.345: E/AndroidRuntime(21011):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
09-10 05:48:03.345: E/AndroidRuntime(21011):    a

代码：

我的可展开列表适配器：

public class StaffExpandableListAdapter extends BaseExpandableListAdapter {

private ArrayList<StaffGroup> staffGroups;
private LayoutInflater layoutInflater;
private Resources resource;
private RoomAdapter ra;

private Context context;

public StaffExpandableListAdapter(Context context,
        ArrayList<StaffGroup> staffGroups) {
    this.staffGroups = staffGroups;
    this.layoutInflater = LayoutInflater.from(context);
    this.resource = context.getResources();
    this.ra = new RoomAdapter(context);

    this.context = context;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    StaffChild staffChild = staffGroups.get(groupPosition)
            .getStaffDetails();
    return staffChild;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {
    final StaffChild staffChildInfo = (StaffChild) getChild(groupPosition,
            childPosition);
    ViewHolderChild holder;
    if (convertView == null) {
        convertView = layoutInflater
                .inflate(R.layout.child_row_staff, null);
        holder = new ViewHolderChild();
        holder.contact = (TextView) convertView
                .findViewById(R.id.tv_staff_contact);
        holder.consultation = (TextView) convertView
                .findViewById(R.id.tv_staff_consultation);
        holder.locations = (ListView) convertView
                .findViewById(R.id.lv_staff_locations);

        holder.noRoomLocation = (TextView) convertView.findViewById(R.id.no_room_location);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolderChild) convertView.getTag();

    }

    holder.contact.setText(staffChildInfo.getContact().trim());

    holder.consultation.setText(staffChildInfo.getConsultation().trim());
    String roomId = staffChildInfo.getRoomId();

    final ArrayList<RoomLocation> roomLocationInfos = new ArrayList<RoomLocation>();
    String[] roomIdForSearch = roomId.split(":");
    if (roomIdForSearch.length <= 1) {
        holder.noRoomLocation.setVisibility(View.VISIBLE);
        holder.locations.setVisibility(View.GONE);
    }else{
        holder.noRoomLocation.setVisibility(View.GONE);
        holder.locations.setVisibility(View.VISIBLE);

        for (int i = 1; i < roomIdForSearch.length; i++) {
            ra.openToRead();
            roomLocationInfos.add(ra.getRoomLocation(Integer
                    .valueOf(roomIdForSearch[i].trim())));
            ra.close();
        }

        String[] items = new String[roomLocationInfos.size()];
        int i = 0;
        for (RoomLocation rl : roomLocationInfos) {
            items[i++] = formatLocationName(rl.getName());

        }

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(context,
                R.layout.item_location, R.id.tv_item_location, items);
        holder.locations.setAdapter(adapter);
        adapter.notifyDataSetInvalidated();
        adapter.notifyDataSetChanged();
        Utility.setListViewHeightBasedOnChildren(holder.locations);

        holder.locations.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                startBuildnigPlanActivityInSearchMod(
                        roomLocationInfos.get(position).getX(),
                        roomLocationInfos.get(position).getY(),
                        roomLocationInfos.get(position).getBuildingId(),
                        roomLocationInfos.get(position).getFloorId());

            }

        });
        holder.locations.setFocusable(false);

    }

    return convertView;
}

@SuppressLint("DefaultLocale")
private String formatLocationName(String locationNumber) {
    String location1Format[] = locationNumber.split(":");
    String buildingName = location1Format[0].trim();
    String roomName = location1Format[1].trim();
    return roomName + " (" + buildingName.toUpperCase(Locale.getDefault())
            + ")";
}

@Override
public int getChildrenCount(int groupPosition) {
    return 1;
}

@Override
public Object getGroup(int groupPosition) {
    return staffGroups.get(groupPosition);
}

@Override
public int getGroupCount() {
    return staffGroups.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
    StaffGroup staffGroupInfo = (StaffGroup) getGroup(groupPosition);

    ViewHolderGroup holder;
    if (convertView == null) {
        convertView = layoutInflater
                .inflate(R.layout.group_row_staff, null);
        holder = new ViewHolderGroup();
        holder.staffId = (TextView) convertView
                .findViewById(R.id.tv_staff_id);
        holder.staffName = (TextView) convertView
                .findViewById(R.id.tv_staff_name);
        holder.groupIndicator = (ImageView) convertView
                .findViewById(R.id.iv_group_indicator);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolderGroup) convertView.getTag();
    }

    if (isExpanded) {
        holder.groupIndicator.setImageDrawable(resource
                .getDrawable(R.drawable.iv_expanded));
    } else {
        holder.groupIndicator.setImageDrawable(resource
                .getDrawable(R.drawable.iv_not_expanded));
    }

    holder.staffId.setText(staffGroupInfo.getId().trim());
    if (staffGroupInfo.getTitle().trim().equals("No data")) {
        holder.staffName.setText(staffGroupInfo.getStaffName().trim());
    } else {
        holder.staffName.setText(staffGroupInfo.getStaffName().trim()
                + ", " + staffGroupInfo.getTitle().trim());
    }

    return convertView;

}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

public void startBuildnigPlanActivityInSearchMod(){
    ...
}

/**
 * ViewHolderGroup class for group view
 * 
 * 
 * 
 */
static class ViewHolderGroup {
    TextView staffId;
    TextView staffName;
    ImageView groupIndicator;

}

/**
 * ViewHolderChild class for child view
 * 
 * 
 * 
 */
static class ViewHolderChild {
    ListView locations;
    TextView contact;
    TextView consultation;
    TextView noRoomLocation;
}

}

ListView是在getChildView内创建的，setOnItemClickListener也是如此。在我的活动中，我通常称之为ExpandableListView。希望这有帮助吗？！

Answer 1

我认为你不再需要回答，但我遇到了同样的问题，我找到了这个解决方案：我正在使用这个功能：

Bitmap thumbnail = Bitmap.createScaledBitmap(bmp, w, h, true)
if (!bmp.isRecycled()) {
    bmp.recycle();
}
bmp = null;

通过阅读这种方法的描述，我发现：

“在可能的情况下，创建一个从现有位图缩放的新位图。 如果指定的宽度和高度与源位图的当前宽度和高度相同，则返回源位图，不返回新位图已创建。“

基本上，在这种情况下，w和h匹配我的“bmp”宽度和高度，因此createScaledBitmap（）函数不会创建新对象，而是使用源代码（bmp）和“bmp”地址将用于我的“缩略图”变量。如果我尝试回收bmp（认为它将不再使用），我错了，因为变量“thumbnail”仍然使用相同的地址，我的其余代码将无效。

所以这是我的简单解决方案：

Bitmap thumbnail = Bitmap.createScaledBitmap(bmp, w, h, true);
if (!thumbnail.equals(bmp)) {
    if (!bmp.isRecycled()) {
        bmp.recycle();
    }
    bmp = null;
}

希望这会对某人有所帮助！

Answer 2

尝试使用：

if (!bitmap.isRecycled())
           {
             bitmap.recycle;
           }

然后创建您的位图。

IllegalArgumentException：无法绘制回收的位图

2 个答案: