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

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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
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>

_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>

_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>

_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;
    }
}


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.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(4848));
                imageView.setAdjustViewBounds(
false);
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(
5555);
            } 
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>

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;
    }
}

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;
    
    
/** Called when the activity is first created. */
    @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);
    }
}


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(
000"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(
32000);
            
return textView;
        }
    }
}


OK
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