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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 };
}
} 未完待续>> OK
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