安卓Launcher之获取手机安装的应用列表，安卓launcher

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发布时间：2019-06-29

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Launcher中最主要的就是获取所有应用列表的入口以及图标，一般获取的方法有两种：

PackageInfo

ResolveInfo

运行获取所有APP的Launcher并且允许进行点击事件，进入到应用

下面通过这两种方法获取到所有应用的列表：

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：

下面在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(); // 获取手机内所有应用 List
           
             packlist = pManager.getInstalledPackages(0); for (int i = 0; i < packlist.size(); i++) { PackageInfo pak = (PackageInfo) packlist.get(i); // if()里的值如果<=0则为自己装的程序，否则为系统工程自带 if ((pak.applicationInfo.flags & pak.applicationInfo.FLAG_SYSTEM) <= 0) { // 添加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;    }}