控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView, ExpandableList
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介绍
在 Android 中使用各种控件(View)
- TextSwitcher -
文字转换器控件(改变文字时增加一些动画效果) - Gallery -
缩略图浏览器控件 - ImageSwitcher -
图片转换器控件(改变图片时增加一些动画效果) - GridView -
网格控件 - ListView -
列表控件 - ExpandableList -
支持展开/收缩功能的列表控件
1、TextSwitcher 的 Demo
textswitcher.xml
代码
<?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">
<Button android:id="@+id/btnChange" android:layout_width ="wrap_content"
android:layout_height ="wrap_content" android:text ="改变文字" />
<!--
TextSwitcher - 文字转换器控件(改变文字时增加一些动画效果)
-->
<TextSwitcher android:id="@+id/textSwitcher"
android:layout_width ="fill_parent" android:layout_height ="wrap_content" />
</LinearLayout>
<LinearLayout
</LinearLayout>
_TextSwitcher.java
代码
package com.webabcd.view;
import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher;
public class _TextSwitcher extends Activity implements ViewSwitcher.ViewFactory {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.setContentView(R.layout.textswithcer);
setTitle( "TextSwithcer");
final TextSwitcher switcher = (TextSwitcher) findViewById(R.id.textSwitcher);
// 指定转换器的 ViewSwitcher.ViewFactory
switcher.setFactory( this);
// 设置淡入和淡出的动画效果
Animation in = AnimationUtils.loadAnimation( this, android.R.anim.fade_in);
Animation out = AnimationUtils.loadAnimation( this, android.R.anim.fade_out);
switcher.setInAnimation(in);
switcher.setOutAnimation(out);
// 单击一次按钮改变一次文字
Button btnChange = (Button) this.findViewById(R.id.btnChange);
btnChange.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
switcher.setText(String.valueOf( new Random().nextInt()));
}
});
}
// 重写 ViewSwitcher.ViewFactory 的 makeView(),返回一个 View
@Override
public View makeView() {
TextView textView = new TextView( this);
textView.setTextSize( 36);
return textView;
}
}
}
2、Gallery 的 Demo
gallery.xml
代码
<?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">
<!--
Gallery - 缩略图浏览器控件
spacing - 缩略图列表中各个缩略图之间的间距
-->
<Gallery android:id="@+id/gallery" android:layout_width ="fill_parent"
android:layout_height ="wrap_content" android:spacing ="20px" />
</LinearLayout>
<LinearLayout
</LinearLayout>
_Gallery.java
代码
package com.webabcd.view;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.Gallery.LayoutParams;
public class _Gallery extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.setContentView(R.layout.gallery);
setTitle( "Gallery");
Gallery gallery = (Gallery) findViewById(R.id.gallery);
// 为缩略图浏览器指定一个适配器
gallery.setAdapter( new ImageAdapter( this));
// 响应 在缩略图列表上选中某个缩略图后的 事件
gallery.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView <?> parent, View v,
int position, long id) {
Toast.makeText(_Gallery. this, String.valueOf(position), Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView <?> arg0) {
}
});
}
// 继承 BaseAdapter 用以实现自定义的图片适配器
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context context) {
mContext = context;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem( int position) {
return position;
}
public long getItemId( int position) {
return position;
}
public View getView( int position, View convertView, ViewGroup parent) {
ImageView image = new ImageView(mContext);
image.setImageResource(mThumbIds[position]);
image.setAdjustViewBounds( true);
image.setLayoutParams( new Gallery.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
return image;
}
}
// 需要显示的图片集合
private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02,
R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };
}
}
3、ImageSwitcher 的 Demo
imageswitcher.xml
代码
<?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">
<Gallery android:id="@+id/gallery" android:layout_width ="fill_parent"
android:layout_height ="wrap_content" android:spacing ="20px" />
<!--
ImageSwitcher - 图片转换器控件(改变图片时增加一些动画效果)
-->
<ImageSwitcher android:id="@+id/imageSwitcher"
android:layout_width ="fill_parent" android:layout_height ="wrap_content" />
</LinearLayout>
<LinearLayout
</LinearLayout>
_ImageSwitcher.java
代码
package com.webabcd.view;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;
import android.widget.Gallery.LayoutParams;
// 图片转换器的使用基本同文字转换器
// 以下是一个用 ImageSwitcher + Gallery 实现的经典的图片浏览器的 Demo
public class _ImageSwitcher extends Activity implements
ViewSwitcher.ViewFactory {
private ImageSwitcher mSwitcher;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.setContentView(R.layout.imageswithcer);
setTitle( "ImageSwithcer");
mSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
mSwitcher.setFactory( this);
mSwitcher.setInAnimation(AnimationUtils.loadAnimation( this,
android.R.anim.fade_in));
mSwitcher.setOutAnimation(AnimationUtils.loadAnimation( this,
android.R.anim.fade_out));
Gallery gallery = (Gallery) findViewById(R.id.gallery);
gallery.setAdapter( new ImageAdapter( this));
gallery.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView <?> parent, View v,
int position, long id) {
mSwitcher.setImageResource(mImageIds[position]);
}
@Override
public void onNothingSelected(AdapterView <?> arg0) {
}
});
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context context) {
mContext = context;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem( int position) {
return position;
}
public long getItemId( int position) {
return position;
}
public View getView( int position, View convertView, ViewGroup parent) {
ImageView image = new ImageView(mContext);
image.setImageResource(mThumbIds[position]);
image.setAdjustViewBounds( true);
image.setLayoutParams( new Gallery.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
return image;
}
}
private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02,
R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };
private Integer[] mImageIds = { R.drawable.icon01, R.drawable.icon02,
R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };
@Override
public View makeView() {
ImageView image = new ImageView( this);
image.setMinimumHeight( 200);
image.setMinimumWidth( 200);
image.setScaleType(ImageView.ScaleType.FIT_CENTER);
image.setLayoutParams( new ImageSwitcher.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
return image;
}
}
public
}
4、GridView 的 Demo
gridview.xml
代码
<?xml version="1.0" encoding="utf-8" ?>
<!--
GridView - 网格控件
numColumns="auto_fit" - 列数自适应
stretchMode - 缩放模式(stretchMode="columnWidth" - 缩放与列宽大小同步)
-->
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id ="@+id/gridView" android:layout_width ="fill_parent"
android:layout_height ="fill_parent" android:padding ="10px"
android:verticalSpacing ="10px" android:horizontalSpacing ="10px"
android:numColumns ="auto_fit" android:columnWidth ="60px"
android:stretchMode ="columnWidth" android:gravity ="center">
</GridView>
<!--
<GridView
</GridView>
_GridView.java
代码
package com.webabcd.view;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class _GridView extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.setContentView(R.layout.gridview);
setTitle( "GridView");
GridView gridView = (GridView) findViewById(R.id.gridView);
// 指定网格控件的适配器为自定义的图片适配器
gridView.setAdapter( new ImageAdapter( this));
}
// 自定义的图片适配器
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context context) {
mContext = context;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem( int position) {
return position;
}
public long getItemId( int position) {
return position;
}
public View getView( int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(mContext);
imageView.setLayoutParams( new GridView.LayoutParams( 48, 48));
imageView.setAdjustViewBounds( false);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding( 5, 5, 5, 5);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
// 网格控件所需图片数据的数据源
private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02,
R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };
}
}
}
5、ListView 的 Demo
main_list_adapter.xml
代码
<?xml version="1.0" encoding="utf-8" ?>
<!--
自定义列表适配器的 layout
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation ="horizontal" android:layout_width ="fill_parent"
android:layout_height ="fill_parent">
<TextView android:id="@+id/text" android:layout_width ="wrap_content"
android:layout_height ="wrap_content" android:textSize ="16sp">
</TextView>
</LinearLayout>
<!--
<LinearLayout
MainListAdapter.java
代码
package com.webabcd.view;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
// 继承 BaseAdapter 以实现自定义的列表适配器
public class MainListAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private List <String> mData;
public MainListAdapter(Context context, List <String> data) {
mInflater = LayoutInflater.from(context);
mData = data;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem( int position) {
return mData.get(position);
}
@Override
public long getItemId( int position) {
return position;
}
@Override
public View getView( int position, View convertView, ViewGroup parent) {
TextView text;
if (convertView == null) {
// 指定一个 layout 作为自定义列表适配器的 layout
convertView = mInflater.inflate(R.layout.main_list_adapter, null);
text = (TextView) convertView.findViewById(R.id.text);
convertView.setTag(text);
} else {
text = (TextView) convertView.getTag();
}
String mItem = mData.get(position);
text.setText(mItem);
return convertView;
}
}
public
}
Main.java
代码
package com.webabcd.view;
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
// 此处要继承 ListActivity ,用以实现 ListView 的功能
public class Main extends ListActivity {
private List <String> mData;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTheme(android.R.style.Theme_Light);
setContentView(R.layout.main);
mData = getData();
// 使用自定义的列表适配器来展现数据
MainListAdapter adapter = new MainListAdapter( this, mData);
// 如需使用系统内置的列表适配器,则可以使用类似如下的方法
// ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, mData);
this.setListAdapter(adapter);
}
// ListView 的数据源
private List <String> getData() {
List <String> items = new ArrayList <String>();
items.add( "TextView");
items.add( "Button");
items.add( "ImageButton");
items.add( "ImageView");
items.add( "CheckBox");
items.add( "RadioButton");
items.add( "AnalogClock");
items.add( "DigitalClock");
items.add( "DatePicker");
items.add( "TimePicker");
items.add( "ToggleButton");
items.add( "EditText");
items.add( "ProgressBar");
items.add( "SeekBar");
items.add( "AutoCompleteTextView");
items.add( "MultiAutoCompleteTextView ");
items.add( "ZoomControls");
items.add( "Include");
items.add( "VideoView");
items.add( "WebView");
items.add( "RatingBar");
items.add( "Tab");
items.add( "Spinner");
items.add( "Chronometer");
items.add( "ScrollView");
items.add( "TextSwitcher");
items.add( "ListView");
items.add( "Gallery");
items.add( "ImageSwitcher");
items.add( "GridView");
items.add( "ExpandableList");
return items;
}
// ListView 中某项被选中后的逻辑
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Intent intent = new Intent();
intent.setClassName( this, "com.webabcd.view._" + mData.get(position));
startActivityForResult(intent, 0);
}
}
public
}
6、ExpandableList 的 Demo
_ExpandableList.java
代码
package com.webabcd.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;
// ExpandableList - 可展开/收缩列表
// 继承 ExpandableListActivity 以实现列表的可展开/收缩的功能
public class _ExpandableList extends ExpandableListActivity {
private ExpandableListAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setTitle( "ExpandableList");
mAdapter = new MyExpandableListAdapter();
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( "ContextMenu");
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;
} else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
Toast.makeText( this, title + " - Group Index: " + groupPos, Toast.LENGTH_SHORT).show();
return true;
}
return false;
}
public class MyExpandableListAdapter extends BaseExpandableListAdapter {
// 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" }
};
@Override
public Object getChild( int groupPosition, int childPosition) {
return children[groupPosition][childPosition];
}
@Override
public long getChildId( int groupPosition, int childPosition) {
return childPosition;
}
@Override
public int getChildrenCount( int groupPosition) {
return children[groupPosition].length;
}
// 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 Object getGroup( int groupPosition) {
return groups[groupPosition];
}
@Override
public int getGroupCount() {
return groups.length;
}
@Override
public long getGroupId( int groupPosition) {
return groupPosition;
}
// 取父列表中的某一项的 View
@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() {
return true;
}
@Override
public boolean isChildSelectable( int groupPosition, int childPosition) {
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(_ExpandableList. this);
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
textView.setPadding( 32, 0, 0, 0);
return textView;
}
}
}
public
}
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