gallery2.java

android 模拟器

/* 
 * Copyright (C) 2007 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.android.samples.view;

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.provider.Contacts.People;
import android.os.Bundle;
import android.widget.Gallery;
import android.widget.GalleryAdapter;
import android.widget.SimpleCursorAdapter;

// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import com.google.android.samples.R;

public class Gallery2 extends Activity {

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.gallery_2);

        // Get a cursor with all people
        Cursor c = getContentResolver().query(People.CONTENT_URI, null, null, null, null);
        startManagingCursor(c);
        
        GalleryAdapter adapter = new MyCursorAdapter(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 });

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

    public class MyCursorAdapter extends SimpleCursorAdapter {
        public MyCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
            super(context, layout, c, from, to);
        }

        @Override
        public float getAlpha(boolean focused, int offset) {
            return offset == 0 && focused ? 1.0f : 0.6f;
        }

        @Override
        public float getScale(boolean focused, int offset) {
            return offset == 0 && focused ? 1.0f : 0.6f;
        }
    }
}