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Android example source code file (ApiDemos.java)

This example Android source code file (ApiDemos.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, apidemos, app, arraylist, boolean, comparator, content, hashmap, intent, list, map, object, override, packagemanager, simpleadapter, string, ui, util, view, widget

The ApiDemos.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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.example.android.apis;

import android.app.ListActivity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ApiDemos extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        Intent intent = getIntent();
        String path = intent.getStringExtra("com.example.android.apis.Path");
        
        if (path == null) {
            path = "";
        }

        setListAdapter(new SimpleAdapter(this, getData(path),
                android.R.layout.simple_list_item_1, new String[] { "title" },
                new int[] { android.R.id.text1 }));
        getListView().setTextFilterEnabled(true);
    }

    protected List getData(String prefix) {
        List<Map> myData = new ArrayList();

        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_SAMPLE_CODE);

        PackageManager pm = getPackageManager();
        List<ResolveInfo> list = pm.queryIntentActivities(mainIntent, 0);

        if (null == list)
            return myData;

        String[] prefixPath;
        
        if (prefix.equals("")) {
            prefixPath = null;
        } else {
            prefixPath = prefix.split("/");
        }
        
        int len = list.size();
        
        Map<String, Boolean> entries = new HashMap();

        for (int i = 0; i < len; i++) {
            ResolveInfo info = list.get(i);
            CharSequence labelSeq = info.loadLabel(pm);
            String label = labelSeq != null
                    ? labelSeq.toString()
                    : info.activityInfo.name;
            
            if (prefix.length() == 0 || label.startsWith(prefix)) {
                
                String[] labelPath = label.split("/");

                String nextLabel = prefixPath == null ? labelPath[0] : labelPath[prefixPath.length];

                if ((prefixPath != null ? prefixPath.length : 0) == labelPath.length - 1) {
                    addItem(myData, nextLabel, activityIntent(
                            info.activityInfo.applicationInfo.packageName,
                            info.activityInfo.name));
                } else {
                    if (entries.get(nextLabel) == null) {
                        addItem(myData, nextLabel, browseIntent(prefix.equals("") ? nextLabel : prefix + "/" + nextLabel));
                        entries.put(nextLabel, true);
                    }
                }
            }
        }

        Collections.sort(myData, sDisplayNameComparator);
        
        return myData;
    }

    private final static Comparator<Map> sDisplayNameComparator = new Comparator() {
        private final Collator   collator = Collator.getInstance();

        public int compare(Map map1, Map map2) {
            return collator.compare(map1.get("title"), map2.get("title"));
        }
    };

    protected Intent activityIntent(String pkg, String componentName) {
        Intent result = new Intent();
        result.setClassName(pkg, componentName);
        return result;
    }
    
    protected Intent browseIntent(String path) {
        Intent result = new Intent();
        result.setClass(this, ApiDemos.class);
        result.putExtra("com.example.android.apis.Path", path);
        return result;
    }

    protected void addItem(List<Map> data, String name, Intent intent) {
        Map<String, Object> temp = new HashMap();
        temp.put("title", name);
        temp.put("intent", intent);
        data.add(temp);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        Map map = (Map) l.getItemAtPosition(position);

        Intent intent = (Intent) map.get("intent");
        startActivity(intent);
    }

}

Other Android examples (source code examples)

Here is a short list of links related to this Android ApiDemos.java source code file:
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