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我正在研究4級可擴展列表視圖它是一切都很好，直到第三級，但是當我預編程擴展列表視圖時，它不能正確擴展到整個屏幕。可擴展列表視圖不能在第四級正常擴展
這裏是我的代碼：
public class MainActivity extends AppCompatActivity {
public static final int FIRST_LEVEL_COUNT = 1;
public static final int SECOND_LEVEL_COUNT = 2;
public static final int THIRD_LEVEL_COUNT = 3;
public static final int FORTH_LEVEL_COUNT = 4;
private ExpandableListView expandableListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
expandableListView = (ExpandableListView) findViewById(R.id.mainList);
expandableListView.setAdapter(new ParentLevel(this));
}
public class ParentLevel extends BaseExpandableListAdapter {
private Context context;
public ParentLevel(Context context) {
this.context = context;
}
@Override
public Object getChild(int arg0, int arg1) {
return arg1;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
SecondLevelExpandableListView secondLevelELV = new SecondLevelExpandableListView(MainActivity.this);
secondLevelELV.setAdapter(new SecondLevelAdapter(context));
secondLevelELV.setGroupIndicator(null);
return secondLevelELV;
}
@Override
public int getChildrenCount(int groupPosition) {
return SECOND_LEVEL_COUNT;
}
@Override
public Object getGroup(int groupPosition) {
return groupPosition;
}
@Override
public int getGroupCount() {
return FIRST_LEVEL_COUNT;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_first, null);
TextView text = (TextView) convertView.findViewById(R.id.eventsListEventRowText);
text.setText("FIRST LEVEL");
}
return convertView;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
public class SecondLevelExpandableListView extends ExpandableListView {
public SecondLevelExpandableListView(Context context) {
super(context);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//999999 is a size in pixels. ExpandableListView requires a maximum height in order to do measurement calculations.
heightMeasureSpec = MeasureSpec.makeMeasureSpec(1500, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
public class ThirdLevelExpandableListView extends ExpandableListView {
public ThirdLevelExpandableListView(Context context) {
super(context);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//999999 is a size in pixels. ExpandableListView requires a maximum height in order to do measurement calculations.
heightMeasureSpec = MeasureSpec.makeMeasureSpec(500 , MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
public class SecondLevelAdapter extends BaseExpandableListAdapter {
private Context context;
public SecondLevelAdapter(Context context) {
this.context = context;
}
@Override
public Object getGroup(int groupPosition) {
return groupPosition;
}
@Override
public int getGroupCount() {
return 1;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_third, null);
TextView text = (TextView) convertView.findViewById(R.id.eventsListEventRowText);
text.setText("SECOND LEVEL");
}
return convertView;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
if (convertView == null) {
/* LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_second, null);
TextView text = (TextView) convertView.findViewById(R.id.eventsListEventRowText);
text.setText("THIRD LEVEL");*/
ThirdLevelExpandableListView thirdlevelELV= new ThirdLevelExpandableListView(MainActivity.this);
/* ExpandableListView thirdlevelELV=new ExpandableListView(MainActivity.this);
LinearLayout.LayoutParams layoutParams=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);
thirdlevelELV.setLayoutParams(layoutParams);*/
thirdlevelELV.setAdapter(new ThirdLevelAdapter(context));
thirdlevelELV.setGroupIndicator(null);
return thirdlevelELV;
}
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return THIRD_LEVEL_COUNT;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
public class ThirdLevelAdapter extends BaseExpandableListAdapter {
private Context context;
public ThirdLevelAdapter(Context context) {
this.context = context;
}
@Override
public Object getGroup(int groupPosition) {
return groupPosition;
}
@Override
public int getGroupCount() {
return THIRD_LEVEL_COUNT;
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_third, null);
TextView text = (TextView) convertView.findViewById(R.id.eventsListEventRowText);
text.setText("THIRD LEVEL");
}
return convertView;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row_forth, null);
TextView text = (TextView) convertView.findViewById(R.id.eventsListEventRowText);
text.setText("FORTH LEVEL");
}
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return FORTH_LEVEL_COUNT;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
}