Launcher最基本的是讓所有的應用程序和入口圖標的列表。有兩種方法來獲得，一般：

PackageInfo

ResolveInfo

執行獲取全部APP的Launcher而且同意進行點擊事件，進入到應用

以下通過這兩種方法獲取到全部應用的列表：

建立基本數據：

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;} }

建立適配器：

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;}@Overridepublic int getCount() {return datas.size();}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder;if (convertView == null) {// 使用View的對象itemView與R.layout.item關聯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;} }

建立適配器的視圖：

<?

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中獲取到列表并顯示到GridView中，并點擊進入應用；

使用PackageInfo

public class PackageInfoDemo extends Activity {private GridView gridview;private PackageManager pManager;private List<PakageMod> datas;private String tag = "MainActivity";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.setContentView(R.layout.activity_main);// 取得gridviewgridview = (GridView) findViewById(R.id.gridview);// 獲取圖片、應用名、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();// 設置圖片shareItem.icon = pManager.getApplicationIcon(pinfo.applicationInfo);// 設置應用程序名字shareItem.appName = pManager.getApplicationLabel(pinfo.applicationInfo).toString();// 設置應用程序的包名shareItem.pakageName = pinfo.applicationInfo.packageName;datas.add(shareItem);}gridview.setAdapter(new baseAdapter(this, datas));// 點擊應用圖標時，做出響應gridview.setOnItemClickListener(new ClickListener());}public static List<PackageInfo> getAllApps(Context context) {List<PackageInfo> apps = new ArrayList<PackageInfo>();PackageManager pManager = context.getPackageManager();// 獲取手機內全部應用List<PackageInfo> packlist = pManager.getInstalledPackages(0);for (int i = 0; i < packlist.size(); i++) {PackageInfo pak = (PackageInfo) packlist.get(i);// if()里的值假設<=0則為自己裝的程序。否則為系統project自帶if ((pak.applicationInfo.flags & pak.applicationInfo.FLAG_SYSTEM) <= 0) {// 加入自己已經安裝的應用程序// apps.add(pak);}apps.add(pak);}return apps;}private class ClickListener implements OnItemClickListener {@Overridepublic 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";@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);this.setContentView(R.layout.activity_main);// 取得gridviewgridview = (GridView) findViewById(R.id.gridview);// 獲取圖片、應用名、包名pManager = this.getPackageManager();datas = new GetAllApps(this).getDatas();gridview.setAdapter(new DemoGridAdapter(this, datas));gridview.setOnItemClickListener(new ClickListener());}// 當用戶點擊應用程序圖標時，將對這個類做出響應private class ClickListener implements OnItemClickListener {@Overridepublic 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;} }
這里getDrawableForDensity須要是15版本號以上的SDK支持。全部低版本號的Launcher不能夠使用；

本博文使用的兩種方法都不須要配置不論什么權限。

Android4.2的Launcher中使用ResolveInfo進行獲取所用的應用列表，這里的ResolveInfo的Demo也是從Launcher源代碼中抄出來的；

也許還有第3種方法.......待續；

本文來自于CSDN博客，轉載請聯系作者；
注明出處http://blog.csdn.net/dreamintheworld/article/details/39718581

版權聲明：本文博客原創文章，博客，未經同意，不得轉載。

轉載于:https://www.cnblogs.com/gcczhongduan/p/4755759.html

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