首页 › C › Android 控件之Gallery图片集

abc20899 发表于 2013-1-26 13:50:29

Android 控件之Gallery图片集

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);
   i.setScaleType(ImageView.ScaleType.FIT_XY);
   i.setLayoutParams(new Gallery.LayoutParams(300, 400));

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

   return i;
}

}


}

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