安德鲁斯Launcher得到的装在手机的应用程序列表

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发布时间：2019-06-21

本文共 7832 字，大约阅读时间需要 26 分钟。

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
     
       datas;	public DemoGridAdapter(Context context, List
      
        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
     
       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
      
        appList = getAllApps(PackageInfoDemo.this);		datas = new ArrayList
       
        ();		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
        
          getAllApps(Context context) {		List
         
           apps = new ArrayList
          
           (); PackageManager pManager = context.getPackageManager(); // 获取手机内全部应用 List
           
             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
     
       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
     
       datas = new ArrayList
      
       ();		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
       
         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
        
          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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