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系出名门Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView, ExpandableList
作者:
webabcd
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
<?
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
>
_TextSwitcher.java
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
<?
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
>
_Gallery.java
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
<?
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
>
_ImageSwitcher.java
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;
}
}
4、GridView 的 Demo
gridview.xml
<?
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.java
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 };
}
}
本文转自webabcd 51CTO博客,原文链接:http://blog.51cto.com/webabcd/342090
,如需转载请自行联系原作者