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







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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;

}

}

}