Android API Demo程序框架

前言

       android API Demo程序主要演示了Android常见API的使用方法, 本文将该程序的框架提取出来, 以作为自己研究和学习Android编程的一个示例收集框架,即将所有自己研究过的例子按照分类收集起来, 方便日后查找。

 

正文

    下面只贴出框架相关的文件内容, 最后说明如果将自己的例子加入到框架中。

 

框架的工程的源码目录结构如下:

核心包

com.fyj.demo包含三个文件, Globals.java MyAppDemoActivity.java MyAppDemoApplication.java, 文件的内容如下:

 

Globals.java

 

package com.fyj.demo;

public class Globals {

	public static final String CATEGORY_MYAPP_DEMO = "android.intent.category.MYAPP_DEMO";
}

该文件主要定义一些全局变量,如上所示,我们定义了自己的CATEGORY。

 

MyAppDemoApplication.java

package com.fyj.demo;

import android.app.Application;
import android.util.Log;

public class MyAppDemoApplication extends Application {
	private static final String TAG = "MyAppDemoApplication";

	@Override
	public void onCreate() {
		Log.i(TAG, "My App Demo is running...");
	}
}


此类可加入一些全局初始化的代码。

 

MyAppDemoActivity.java

package com.fyj.demo;

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;

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;

public class MyAppDemoActivity extends ListActivity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		Intent intent = getIntent();
		String path = intent.getStringExtra("com.fyj.demo.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<Map<String, Object>> getData(String prefix) {
		List<Map<String, Object>> myData = new ArrayList<Map<String, Object>>();

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

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

		if (null == list)
			return myData;

		String[] prefixPath;
		String prefixWithSlash = prefix;

		if (prefix.equals("")) {
			prefixPath = null;
		} else {
			prefixPath = prefix.split("/");
			prefixWithSlash = prefix + "/";
		}

		int len = list.size();

		Map<String, Boolean> entries = new HashMap<String, Boolean>();

		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 (prefixWithSlash.length() == 0
					|| label.startsWith(prefixWithSlash)) {

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

		public int compare(Map<String, Object> map1, Map<String, Object> 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, MyAppDemoActivity.class);
		result.putExtra("com.fyj.demo.Path", path);
		return result;
	}

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

	@Override
	@SuppressWarnings("unchecked")
	protected void onListItemClick(ListView l, View v, int position, long id) {
		Map<String, Object> map = (Map<String, Object>) l
				.getItemAtPosition(position);

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


该类是框架的主活动类,通过它来启动我们之后添加到框架中的一些示例。

 

 扩展包

    除核心包之后的代码都是按照示例的分类放置在不同的扩展包中,作为例子,本文创建了一个扩展包为com.fyj.demo.app

在此包中,我们创建了一个例子,名为HelloWorld.java, 它的内容如下:

package com.fyj.demo.app;

import android.app.Activity;
import android.os.Bundle;

import com.fyj.demo.R;

public class HelloWorld extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.hello);
	}
}


下面进入res目录下,这里我们主要关注的是layout, values子目录,其中layout是一些布局文件,values目录下的strings.xml定义了示例应用程序中的一些字符串, 这里我们主要看下strings.xml文件的内容:

 

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">Hello World, MyAppDemoActivity!</string>
    <string name="app_name">MyAppDemo</string>    
    
    <string name="activity_hello_world">App/Activity/<b>Hello <i>World</i></b></string>

</resources>

其中,在定义示例程序的标题字符串的时候,要按照上述的格式定义, 上述名称代表HelloWorld示例程序被归在App分类下的Activity子分类中,多少个'/'代表有多少个分类层次。

 

最后,我们看下AndroidManifest.xml文件的内容:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.fyj.demo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="15" />

    <application
        android:name="MyAppDemoApplication"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".MyAppDemoActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <!-- Activity Samples -->
        <activity
            android:name=".app.HelloWorld"
            android:label="@string/activity_hello_world" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.MYAPP_DEMO" />
            </intent-filter>
        </activity>
    </application>

</manifest>


 注意,在示例的Activity中, category都要设置为android.intent.category.MYAPP_DEMO。


 


 

 

 

 

你可能感兴趣的:(android,框架,api,String,object)