Android中的Adapter 详解(四)
下面的列表显示了两个最有用和最通用的本地Adapter:
❑ ArrayAdapter
ArrayAdapter是一个绑定View到一组对象的通用类。默认情况下,ArrayAdapter绑定每个对象的toString值到在layout中预先定义的TextView控件上。可变通的,构造函数允许你使用更加复杂的layout或者通过重写getView方法来扩展类从而使用TextView的替代物(如ImageView或嵌套的layout)。
❑ SimpleCursorAdapter
SimpleCursorAdapter绑定View到Content Provider查询返回的游标上。指定一个XML layout定义,然后将数据集中的每一列的值绑定到layout中的一个View上。
下面演示一下SimpleAdapter的用法:
整体布局文件,一个简单的ListView:
XML文件:
下面演示了BaseExpandableListAdapter的用法:
JAVA代码:
❑ ArrayAdapter
ArrayAdapter是一个绑定View到一组对象的通用类。默认情况下,ArrayAdapter绑定每个对象的toString值到在layout中预先定义的TextView控件上。可变通的,构造函数允许你使用更加复杂的layout或者通过重写getView方法来扩展类从而使用TextView的替代物(如ImageView或嵌套的layout)。
❑ SimpleCursorAdapter
SimpleCursorAdapter绑定View到Content Provider查询返回的游标上。指定一个XML layout定义,然后将数据集中的每一列的值绑定到layout中的一个View上。
下面演示一下SimpleAdapter的用法:
package com.wt.app; import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.os.Bundle; import android.view.ContextMenu; import android.view.MenuItem; import android.view.View; import android.view.ContextMenu.ContextMenuInfo; import android.view.View.OnCreateContextMenuListener; import android.widget.AdapterView; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.AdapterView.OnItemClickListener; public class App extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //绑定Layout里面的ListView ListView list = (ListView) findViewById(R.id.ListView01); //生成动态数组,加入数据 ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>(); int[] images=new int[]{android.R.drawable.ic_menu_add,android.R.drawable.ic_menu_delete,android.R.drawable.ic_menu_edit,android.R.drawable.ic_menu_view}; for(int i=0;i<4;i++) { HashMap<String, Object> map = new HashMap<String, Object>(); map.put("itemImage", images[i]);//图像资源的ID map.put("itemTitle", "Title "+i); map.put("itemText", "this is Text "+i); listItem.add(map); } //生成适配器的Item和动态数组对应的元素 SimpleAdapter listItemAdapter = new SimpleAdapter(this,listItem,//数据源 R.layout.row,//ListItem的XML实现 //动态数组与ImageItem对应的子项 new String[] {"itemImage","itemTitle", "itemText"}, //ImageItem的XML文件里面的一个ImageView,两个TextView ID new int[] {R.id.itemImage,R.id.itemTitle,R.id.itemText} ); <span id="transmark"></span> //添加并且显示 list.setAdapter(listItemAdapter); //添加点击 list.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { setTitle("点击第"+arg2+"个项目"); } }); //添加长按点击 list.setOnCreateContextMenuListener(new OnCreateContextMenuListener() { public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) { menu.setHeaderTitle("长按菜单-ContextMenu"); menu.add(0, 0, 0, "弹出长按菜单0"); menu.add(0, 1, 0, "弹出长按菜单1"); } }); } //长按菜单响应函数 @Override public boolean onContextItemSelected(MenuItem item) { setTitle("点击了长按菜单里面的第"+item.getItemId()+"个项目"); return super.onContextItemSelected(item); } }
整体布局文件,一个简单的ListView:
XML文件:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ListView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/ListView01" /> </LinearLayout>
ListView中每行(row)怎么显示的布局文件:
XML文件:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout android:id="@+id/RelativeLayout01" android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:paddingTop="4dip" android:paddingBottom="4dip" android:paddingLeft="12dip" android:paddingRight="12dip"> <ImageView android:paddingTop="12dip" android:layout_alignParentRight="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/itemImage" /> <TextView android:layout_height="wrap_content" android:textSize="20dip" android:layout_width="fill_parent" android:id="@+id/itemTitle" /> <TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_below="@+id/itemTitle" android:id="@+id/itemText" /> </RelativeLayout>
下面演示了BaseExpandableListAdapter的用法:
JAVA代码:
/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.android.apis.view; import android.app.ExpandableListActivity; import android.os.Bundle; import android.view.ContextMenu; import android.view.Gravity; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.ContextMenu.ContextMenuInfo; import android.widget.AbsListView; import android.widget.BaseExpandableListAdapter; import android.widget.ExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.TextView; import android.widget.Toast; import android.widget.ExpandableListView.ExpandableListContextMenuInfo; import com.example.android.apis.R; /** * Demonstrates expandable lists using a custom {@link ExpandableListAdapter} * from {@link BaseExpandableListAdapter}. */ public class ExpandableList1 extends ExpandableListActivity { ExpandableListAdapter mAdapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Set up our adapter mAdapter = new MyExpandableListAdapter(); setListAdapter(mAdapter); registerForContextMenu(getExpandableListView()); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { menu.setHeaderTitle("Sample menu"); menu.add(0, 0, 0, R.string.expandable_list_sample_action); } @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 + ": Child " + childPos + " clicked in group " + groupPos, Toast.LENGTH_SHORT).show(); return true; } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) { int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); Toast.makeText(this, title + ": Group " + groupPos + " clicked", Toast.LENGTH_SHORT).show(); return true; } return false; } /** * A simple adapter which maintains an ArrayList of photo resource Ids. * Each photo is displayed as an image. This adapter supports clearing the * list of photos and adding a new photo. * */ public class MyExpandableListAdapter extends BaseExpandableListAdapter { // Sample data set. children[i] contains the children (String[]) for groups[i]. private String[] groups = { "People Names", "Dog Names", "Cat Names", "Fish Names" }; private String[][] children = { { "Arnold", "Barry", "Chuck", "David" }, { "Ace", "Bandit", "Cha-Cha", "Deuce" }, { "Fluffy", "Snuggles" }, { "Goldy", "Bubbles" } }; public Object getChild(int groupPosition, int childPosition) { return children[groupPosition][childPosition]; } public long getChildId(int groupPosition, int childPosition) { return childPosition; } public int getChildrenCount(int groupPosition) { return children[groupPosition].length; } public TextView getGenericView() { // Layout parameters for the ExpandableListView AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, 64); TextView textView = new TextView(ExpandableList1.this); textView.setLayoutParams(lp); // Center the text vertically textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); // Set the text starting position textView.setPadding(36, 0, 0, 0); return textView; } public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getChild(groupPosition, childPosition).toString()); return textView; } public Object getGroup(int groupPosition) { return groups[groupPosition]; } public int getGroupCount() { return groups.length; } public long getGroupId(int groupPosition) { return groupPosition; } public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TextView textView = getGenericView(); textView.setText(getGroup(groupPosition).toString()); return textView; } public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } public boolean hasStableIds() { return true; } } }
SimpleCursorTreeAdapter用法:
JAVA代码:
/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.android.apis.view; import android.app.ExpandableListActivity; import android.content.ContentUris; import android.content.Context; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.provider.Contacts.People; import android.widget.ExpandableListAdapter; import android.widget.SimpleCursorTreeAdapter; /** * Demonstrates expandable lists backed by Cursors */ public class ExpandableList2 extends ExpandableListActivity { private int mGroupIdColumnIndex; private String mPhoneNumberProjection[] = new String[] { People.Phones._ID, People.Phones.NUMBER }; private ExpandableListAdapter mAdapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Query for people Cursor groupCursor = managedQuery(People.CONTENT_URI, new String[] {People._ID, People.NAME}, null, null, null); // Cache the ID column index mGroupIdColumnIndex = groupCursor.getColumnIndexOrThrow(People._ID); // Set up our adapter mAdapter = new MyExpandableListAdapter(groupCursor, this, android.R.layout.simple_expandable_list_item_1, android.R.layout.simple_expandable_list_item_1, new String[] {People.NAME}, // Name for group layouts new int[] {android.R.id.text1}, new String[] {People.NUMBER}, // Number for child layouts new int[] {android.R.id.text1}); setListAdapter(mAdapter); } public class MyExpandableListAdapter extends SimpleCursorTreeAdapter { public MyExpandableListAdapter(Cursor cursor, Context context, int groupLayout, int childLayout, String[] groupFrom, int[] groupTo, String[] childrenFrom, int[] childrenTo) { super(context, cursor, groupLayout, groupFrom, groupTo, childLayout, childrenFrom, childrenTo); } @Override protected Cursor getChildrenCursor(Cursor groupCursor) { // Given the group, we return a cursor for all the children within that group // Return a cursor that points to this contact's phone numbers Uri.Builder builder = People.CONTENT_URI.buildUpon(); ContentUris.appendId(builder, groupCursor.getLong(mGroupIdColumnIndex)); builder.appendEncodedPath(People.Phones.CONTENT_DIRECTORY); Uri phoneNumbersUri = builder.build(); // The returned Cursor MUST be managed by us, so we use Activity's helper // functionality to manage it for us. return managedQuery(phoneNumbersUri, mPhoneNumberProjection, null, null, null); } } }
静以修身,俭以养德。
posted on 2016-09-12 23:42 miaozhenzhong 阅读(131) 评论(0) 编辑 收藏 举报