系出名门Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView-阿里云开发者社区

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 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 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 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 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
[源码下载]

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

系出名门Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView

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