Android支持展开/收缩功能的列表控件
2014-09-04 13:18
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最近在做一个Rss阅读器,看了下别人做的阅读器中的列表控件可以展开、收缩,我就在网上搜索了一下。下面就我找到的一个小例子,给大家分享一下。
ActivityMain .java
Java代码
package study.com.android;
import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;
public class ActivityMain extends ExpandableListActivity {
private ExpandableListAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setTitle("ExpandableList");
mAdapter = new MyExpandableListAdapter(this);
setListAdapter(mAdapter);
registerForContextMenu(this.getExpandableListView());
}
// 为列表的每一项创建上下文菜单(即长按后 呼出的菜单)
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
menu.setHeaderTitle("ContexMenu");
menu.add(0, 0, 0, "ContextMenu");
}
// 单击上下文菜单后的逻辑
@Override
public boolean onContextItemSelected(MenuItem item) {
ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item
.getMenuInfo();
String title = ((TextView) info.targetView).getText().toString();
int type = ExpandableListView
.getPackedPositionType(info.packedPosition);
if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
int groupPos = ExpandableListView
.getPackedPositionGroup(info.packedPosition);
int childPos = ExpandableListView
.getPackedPositionChild(info.packedPosition);
Toast.makeText(
this,
title + "-Group Index" + groupPos + "Child Index:"
+ childPos, Toast.LENGTH_SHORT).show();
return true;
}
return false;
}
}
MyExpandableListAdapter.java
Java代码
package study.com.android;
import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class MyExpandableListAdapter extends BaseExpandableListAdapter {
private Context mContext;
// 父列表数据
private String[] groups = { "group1", "group2", "group3", "group4", "" };
// 子列表数据
private String[][] children = { { "child1" }, { "child1", "child2" },
{ "child1", "child2", "child3" },
{ "child1", "child2", "child3", "child4" }, };
MyExpandableListAdapter(Context context) {
mContext = context;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return children[groupPosition][childPosition];
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
// 取子列表中的某一项的view
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
TextView textView = getGenericView();
;
textView.setText(getChild(groupPosition, childPosition).toString());
return textView;
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return children[groupPosition].length;
}
@Override
public Object getGroup(int groupPosition) {
return groups[groupPosition];
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return groups.length;
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
TextView textView = getGenericView();
textView.setText(getGroup(groupPosition).toString());
return textView;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
// 获取某一项的view的逻辑
private TextView getGenericView() {
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, 48);
TextView textView = new TextView(mContext);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
textView.setPadding(32, 0, 0, 0);
return textView;
}
}
运行的结果如下:
ActivityMain .java
Java代码
package study.com.android;
import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;
public class ActivityMain extends ExpandableListActivity {
private ExpandableListAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setTitle("ExpandableList");
mAdapter = new MyExpandableListAdapter(this);
setListAdapter(mAdapter);
registerForContextMenu(this.getExpandableListView());
}
// 为列表的每一项创建上下文菜单(即长按后 呼出的菜单)
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
menu.setHeaderTitle("ContexMenu");
menu.add(0, 0, 0, "ContextMenu");
}
// 单击上下文菜单后的逻辑
@Override
public boolean onContextItemSelected(MenuItem item) {
ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item
.getMenuInfo();
String title = ((TextView) info.targetView).getText().toString();
int type = ExpandableListView
.getPackedPositionType(info.packedPosition);
if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
int groupPos = ExpandableListView
.getPackedPositionGroup(info.packedPosition);
int childPos = ExpandableListView
.getPackedPositionChild(info.packedPosition);
Toast.makeText(
this,
title + "-Group Index" + groupPos + "Child Index:"
+ childPos, Toast.LENGTH_SHORT).show();
return true;
}
return false;
}
}
MyExpandableListAdapter.java
Java代码
package study.com.android;
import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;
public class MyExpandableListAdapter extends BaseExpandableListAdapter {
private Context mContext;
// 父列表数据
private String[] groups = { "group1", "group2", "group3", "group4", "" };
// 子列表数据
private String[][] children = { { "child1" }, { "child1", "child2" },
{ "child1", "child2", "child3" },
{ "child1", "child2", "child3", "child4" }, };
MyExpandableListAdapter(Context context) {
mContext = context;
}
@Override
public Object getChild(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return children[groupPosition][childPosition];
}
@Override
public long getChildId(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return childPosition;
}
// 取子列表中的某一项的view
@Override
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
TextView textView = getGenericView();
;
textView.setText(getChild(groupPosition, childPosition).toString());
return textView;
}
@Override
public int getChildrenCount(int groupPosition) {
// TODO Auto-generated method stub
return children[groupPosition].length;
}
@Override
public Object getGroup(int groupPosition) {
return groups[groupPosition];
}
@Override
public int getGroupCount() {
// TODO Auto-generated method stub
return groups.length;
}
@Override
public long getGroupId(int groupPosition) {
// TODO Auto-generated method stub
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
TextView textView = getGenericView();
textView.setText(getGroup(groupPosition).toString());
return textView;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return true;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
return true;
}
// 获取某一项的view的逻辑
private TextView getGenericView() {
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, 48);
TextView textView = new TextView(mContext);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
textView.setPadding(32, 0, 0, 0);
return textView;
}
}
运行的结果如下:
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