grid1.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.content.Intent;
import android.content.PackageManager.ResolveInfo;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ListAdapter;

import java.util.List;

//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 Grid1 extends Activity {

    GridView mGrid;

    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        loadApps(); // do this in onresume?

        setContentView(R.layout.grid_1);
        mGrid = (GridView) findViewById(R.id.myGrid);
        mGrid.setAdapter(new AppsAdapter(this));
    }

    private List<ResolveInfo> mApps;

    private void loadApps() {
        Intent mainIntent = new Intent(Intent.MAIN_ACTION, null);
        mainIntent.addCategory(Intent.LAUNCHER_CATEGORY);

        mApps = getPackageManager().queryIntentActivities(mainIntent, 0);
    }

    public class AppsAdapter extends BaseAdapter {
        public AppsAdapter(Context context) {
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView i = new ImageView(Grid1.this);

            ResolveInfo info = mApps.get(position);

            i.setImageDrawable(getPackageManager().getActivityIcon(
                    info.activityInfo));
            i.setScaleType(ImageView.ScaleType.FIT_CENTER);
            i.setLayoutParams(new Gallery.LayoutParams(50, 50));
            return i;
        }


        public final int getCount() {
            return mApps.size();
        }

        public final Object getItem(int position) {
            return mApps.get(position);
        }

        public final long getItemId(int position) {
            return position;
        }
    }

}