安德鲁斯Launcher得到的装在手机的应用程序列表

Launcher最基本的是让所有的应用程序和入口图标的列表。有两种方法来获得，一般：

PackageInfo

ResolveInfo

执行获取全部APP的Launcher而且同意进行点击事件，进入到应用

以下通过这两种方法获取到全部应用的列表：

建立基本数据：

PakageMod.java

public class PakageMod {

	public String pakageName;
	public String appName;
	public Drawable icon;

	public PakageMod() {
		super();
	}
	
	public PakageMod(String pakageName, String appName, Drawable icon) {
		super();
		this.pakageName = pakageName;
		this.appName = appName;
		this.icon = icon;
	}
}

建立适配器：

public class DemoGridAdapter extends BaseAdapter {

	private LayoutInflater inflater;
	private List<PakageMod> datas;

	public DemoGridAdapter(Context context, List<PakageMod> datas) {
		super();
		inflater = LayoutInflater.from(context);
		this.datas = datas;
	}

	@Override
	public int getCount() {
		return datas.size();
	}

	@Override
	public Object getItem(int position) {
		return null;
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder holder;
		if (convertView == null) {
			// 使用View的对象itemView与R.layout.item关联
			convertView = inflater.inflate(R.layout.apps, null);
			holder = new ViewHolder();
			holder.icon = (ImageView) convertView.findViewById(R.id.apps_image);
			holder.label = (TextView) convertView
					.findViewById(R.id.apps_textview);
			convertView.setTag(holder);
		} else {
			holder = (ViewHolder) convertView.getTag();
		}

		holder.icon.setImageDrawable(datas.get(position).icon);
		holder.label.setText(datas.get(position).appName);

		return convertView;

	}

	class ViewHolder {
		private ImageView icon;
		private TextView label;
	}
}

建立适配器的视图：

<?
xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/apps_image"
        android:layout_width="48dip"
        android:layout_height="48dip"
        android:icon="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/apps_textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:maxEms="5"
        android:maxLines="1"
        android:text="good" />

</LinearLayout>

以下在Activity中获取到列表并显示到GridView中，并点击进入应用；

使用PackageInfo

public class PackageInfoDemo extends Activity {

	private GridView gridview;
	private PackageManager pManager;
	private List<PakageMod> datas;
	private String tag = "MainActivity";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.setContentView(R.layout.activity_main);
		// 取得gridview
		gridview = (GridView) findViewById(R.id.gridview);
		// 获取图片、应用名、包名
		pManager = PackageInfoDemo.this.getPackageManager();
		List<PackageInfo> appList = getAllApps(PackageInfoDemo.this);
		datas = new ArrayList<PakageMod>();
		for (int i = 0; i < appList.size(); i++) {
			PackageInfo pinfo = appList.get(i);
			PakageMod shareItem = new PakageMod();
			// 设置图片
			shareItem.icon = pManager.getApplicationIcon(pinfo.applicationInfo);
			// 设置应用程序名字
			shareItem.appName = pManager.getApplicationLabel(
					pinfo.applicationInfo).toString();
			// 设置应用程序的包名
			shareItem.pakageName = pinfo.applicationInfo.packageName;

			datas.add(shareItem);

		}
		gridview.setAdapter(new baseAdapter(this, datas));

		// 点击应用图标时，做出响应
		gridview.setOnItemClickListener(new ClickListener());
	}

	public static List<PackageInfo> getAllApps(Context context) {

		List<PackageInfo> apps = new ArrayList<PackageInfo>();
		PackageManager pManager = context.getPackageManager();
		// 获取手机内全部应用
		List<PackageInfo> packlist = pManager.getInstalledPackages(0);
		for (int i = 0; i < packlist.size(); i++) {
			PackageInfo pak = (PackageInfo) packlist.get(i);
			// if()里的值假设<=0则为自己装的程序。否则为系统project自带
			if ((pak.applicationInfo.flags & pak.applicationInfo.FLAG_SYSTEM) <= 0) {
				// 加入自己已经安装的应用程序
				// apps.add(pak);
			}
			apps.add(pak);
		}
		return apps;
	}

	private class ClickListener implements OnItemClickListener {

		@Override
		public void onItemClick(AdapterView<?
> arg0, View arg1, int position,
				long arg3) {
			Intent intent = new Intent();
			intent = PackageInfoDemo.this.getPackageManager()
					.getLaunchIntentForPackage(datas.get(position).pakageName);
			startActivity(intent);
		}
	}
}

使用ResolveInfo

public class ResolveInfoDemo extends Activity {
	private GridView gridview;
	private PackageManager pManager;
	private List<PakageMod> datas;
	private String tag = "ResolveInfoDemo";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		this.setContentView(R.layout.activity_main);
		// 取得gridview
		gridview = (GridView) findViewById(R.id.gridview);

		// 获取图片、应用名、包名
		pManager = this.getPackageManager();

		datas = new GetAllApps(this).getDatas();
		gridview.setAdapter(new DemoGridAdapter(this, datas));
		gridview.setOnItemClickListener(new ClickListener());
	}

	// 当用户点击应用程序图标时，将对这个类做出响应
	private class ClickListener implements OnItemClickListener {

		@Override
		public void onItemClick(AdapterView<?> adapterView, View view, int arg2,
				long arg3) {
			Intent intent = new Intent();
			intent = getPackageManager().getLaunchIntentForPackage(
					datas.get(arg2).pakageName);
			startActivity(intent);
		}

	}
}

GetAllApps.java

public class GetAllApps {

	private Context mContext;
	private PackageManager packageManager;
	private int mIconDpi;
	private String tag = "GetAllApps";
	private List<PakageMod> datas = new ArrayList<PakageMod>();
	
	public GetAllApps(Context mContext){
		this.mContext = mContext;
		 ActivityManager activityManager =
	                (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
		packageManager = mContext.getPackageManager();
		 mIconDpi = activityManager.getLauncherLargeIconDensity();
	}
	
	public void loadAllAppsByBatch() {
		List<ResolveInfo> apps = null;
		Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
		mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		apps = packageManager.queryIntentActivities(mainIntent, 0);
		for (int i = 0; i < apps.size(); i++) {
			String packageName = apps.get(i).activityInfo.applicationInfo.packageName;
			String title = apps.get(i).loadLabel(packageManager).toString();
			Drawable icon = null;
			if(title == null){
				title = apps.get(i).activityInfo.name;
			}
			ActivityInfo info = apps.get(i).activityInfo;
			icon = getFullResIcon(info);
			datas.add(new PakageMod(packageName,title,icon));
		}
	}

	public Drawable getFullResIcon(ActivityInfo info) {
        Resources resources;
        try {
            resources = packageManager.getResourcesForApplication(
                    info.applicationInfo);
        } catch (PackageManager.NameNotFoundException e) {
            resources = null;
        }
        if (resources != null) {
            int iconId = info.getIconResource();            
            if (iconId != 0) {
                return getFullResIcon(resources, iconId);
            }
        }
        return getFullResDefaultActivityIcon();
    }
	
	public Drawable getFullResDefaultActivityIcon() {
        return getFullResIcon(Resources.getSystem(),
                android.R.mipmap.sym_def_app_icon);
    }
	
	public Drawable getFullResIcon(Resources resources, int iconId) {
        Drawable d;
        try {
        	// requires API level 15 (current min is 14):
            d = resources.getDrawableForDensity(iconId, mIconDpi);
        } catch (Resources.NotFoundException e) {
            d = null;
        }

        return (d != null) ? d : getFullResDefaultActivityIcon();
    }

	public List<PakageMod> getDatas() {
		loadAllAppsByBatch();
		return datas;
	}
}

这里getDrawableForDensity须要是15版本号以上的SDK支持。全部低版本号的Launcher不能够使用；

本博文使用的两种方法都不须要配置不论什么权限。

Android4.2的Launcher中使用ResolveInfo进行获取所用的应用列表，这里的ResolveInfo的Demo也是从Launcher源代码中抄出来的；

也许还有第3种方法.......待续；

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