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；

本文来自于CSDN博客，转载请联系作者；

注明出处http://blog.csdn.net/dreamintheworld/article/details/39718581

版权声明：本文博客原创文章，博客，未经同意，不得转载。

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