Android 控件之Gallery图片集

 　　Gallery是Android中的图片库控件。先看效果，爽一番







源码下载

一、简介

　　在中心锁定，水平显示列表的项。

二、实例

1.布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:orientation="vertical"
android:layout_height="wrap_content">

<Gallery xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gallery"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<Gallery android:id="@+id/gallery1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:spacing="16dp"
/>

</LinearLayout>

</LinearLayout>

2.属性文件

<?xml version="1.0" encoding="utf-8"?>

<resources>

<declare-styleable name="TogglePrefAttrs">
<attr name="android:preferenceLayoutChild" />
</declare-styleable>

<!-- These are the attributes that we want to retrieve from the theme
in view/Gallery1.java -->
<declare-styleable name="Gallery1">
<attr name="android:galleryItemBackground" />
</declare-styleable>

<declare-styleable name="LabelView">
<attr name="text" format="string" />
<attr name="textColor" format="color" />
<attr name="textSize" format="dimension" />
</declare-styleable>
</resources>

3.代码

/**
*
*/
package wjq.WidgetDemo;

import android.R.layout;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.Contacts.People;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.SimpleCursorAdapter;
import android.widget.SpinnerAdapter;
import android.widget.Toast;
import android.widget.AdapterView.AdapterContextMenuInfo;

/**
* @author 记忆的永恒
*
*/
public class GalleryDemo extends Activity {
private Gallery gallery;
private Gallery gallery1;

/*
* (non-Javadoc)
*
* @see android.app.Activity#onCreate(android.os.Bundle)
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.gallerypage);
gallery = (Gallery) findViewById(R.id.gallery);
gallery.setAdapter(new ImageAdapter(this));

registerForContextMenu(gallery);

Cursor c = getContentResolver().query(People.CONTENT_URI, null, null, null, null);
startManagingCursor(c);

SpinnerAdapter adapter = new SimpleCursorAdapter(this,
// Use a template that displays a text view
android.R.layout.simple_gallery_item,
// Give the cursor to the list adatper
c,
// Map the NAME column in the people database to...
new String[] {People.NAME},
// The "text1" view defined in the XML template
new int[] { android.R.id.text1 });

gallery1= (Gallery) findViewById(R.id.gallery1);
gallery1.setAdapter(adapter);
}

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
menu.add("Action");
}

@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item
.getMenuInfo();
Toast.makeText(this, "Longpress: " + info.position, Toast.LENGTH_SHORT)
.show();
return true;
}

public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private Context mContext;

private Integer[] mImageIds = { R.drawable.b, R.drawable.c,
R.drawable.d, R.drawable.f, R.drawable.g };

public ImageAdapter(Context context) {
mContext = context;

TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
mGalleryItemBackground = a.getResourceId(
R.styleable.Gallery1_android_galleryItemBackground, 0);
a.recycle();
}

@Override
public int getCount() {
return mImageIds.length;
}

@Override
public Object getItem(int position) {
return position;
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(mContext);

i.setImageResource(mImageIds[position]);
i.setScaleType(ImageView.ScaleType.FIT_XY);
i.setLayoutParams(new Gallery.LayoutParams(300, 400));

// The preferred Gallery item background
i.setBackgroundResource(mGalleryItemBackground);

return i;
}

}

}