context.getPackageManager () .getInstalledApplications (PackageManager.GET_META_DATA); 应该返回所有已安装应用程序的列表，但在android 11中，它只返回系统应用程序的列表。要获得所有应用程序(系统+用户)的列表，我们需要为应用程序提供额外的权限

< uses-permission android: name = " android.permission.QUERY_ALL_PACKAGES " / >

我有另一个解决方案:

ArrayList<AppInfo> myAppsToUpdate;

    // How to get the system and the user apps.
    public ArrayList<AppInfo> getAppsToUpdate() {

        PackageManager pm = App.getContext().getPackageManager();
        List<ApplicationInfo> installedApps = pm.getInstalledApplications(0);
        myAppsToUpdate = new ArrayList<AppInfo>();
        for (ApplicationInfo aInfo : installedApps) {

            if ((aInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
                // System apps 
            } else {
                // Users apps
                AppInfo appInfo = new AppInfo();
                appInfo.setAppName(aInfo.loadLabel(pm).toString());
                appInfo.setPackageName(aInfo.packageName);
                appInfo.setLaunchActivity(pm.getLaunchIntentForPackage(aInfo.packageName).toString());
                try {
                    PackageInfo info = pm.getPackageInfo(aInfo.packageName, 0);
                    appInfo.setVersionName(info.versionName.toString());
                    appInfo.setVersionCode("" + info.versionCode);
                    myAppsToUpdate.add(appInfo);
                } catch (NameNotFoundException e) {
                    Log.e("ERROR", "we could not get the user's apps");
                }

            }
        }
        return myAppsToUpdate;
    }

另一种过滤系统应用程序的方法(适用于king9981的例子):

/**
 * Return whether the given PackageInfo represents a system package or not.
 * User-installed packages (Market or otherwise) should not be denoted as
 * system packages.
 * 
 * @param pkgInfo
 * @return
 */
private boolean isSystemPackage(PackageInfo pkgInfo) {
    return ((pkgInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0);
}

过滤基于系统的应用程序:

private boolean isSystemPackage(ResolveInfo ri) {
    return (ri.activityInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
}

这个答案是正确的一个列表安装的应用程序显示和搜索功能添加。

科特林

activity_all_installed_app.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".AllInstalledAppActivity">

    <TextView
        android:id="@+id/totalInstalledApp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/total_Installed_Apps"
        android:textStyle="bold"
        android:textAlignment="center"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="vertical"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/totalInstalledApp"
        tools:listitem="@layout/installed_app_layout" />
</androidx.constraintlayout.widget.ConstraintLayout>

installed_app_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_margin="4dp"
    android:elevation="6dp"
    android:background="?attr/selectableItemBackground">
    <androidx.cardview.widget.CardView
        android:id="@+id/cardview"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        app:cardCornerRadius="5dp"
        app:cardUseCompatPadding="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <ImageView
                android:id="@+id/app_icon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:contentDescription="@string/todo"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/list_app_name"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:text="@string/app_name"
                android:textSize="16sp"
                android:textStyle="bold"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/app_icon"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/app_package"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:text="@string/app_package_name"
                android:textStyle="bold"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/app_icon"
                app:layout_constraintTop_toBottomOf="@+id/list_app_name" />
        </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>

AppModel.kt

import android.graphics.drawable.Drawable

class AppModel(private var name:String, private var icon: Drawable, private var packages:String) {
    fun getName(): String {
        return name
    }

    fun getIcon(): Drawable {
        return icon
    }

    fun getPackages(): String {
        return packages
    }
}

AppAdapter.kt

import android.app.AlertDialog
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.materialsouk.allcodeapp.R
import com.materialsouk.allcodeapp.models.AppModel
import java.util.ArrayList

import android.content.Intent
import android.net.Uri
import android.provider.Settings
import android.widget.Toast


class AppAdapter(private val context: Context, private var appModelList: ArrayList<AppModel>) :
    RecyclerView.Adapter<AppAdapter.ViewHolder>() {


    class ViewHolder(ItemView: View) : RecyclerView.ViewHolder(ItemView) {
        val appNameTxt: TextView = itemView.findViewById(R.id.list_app_name)
        val appPackageNameTxt: TextView = itemView.findViewById(R.id.app_package)
        val appIcon: ImageView = itemView.findViewById(R.id.app_icon)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view: View =
            LayoutInflater.from(parent.context)
                .inflate(R.layout.installed_app_layout, parent, false)
        return ViewHolder(view)
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.appNameTxt.text = appModelList[position].getName()
        holder.appIcon.setImageDrawable(appModelList[position].getIcon())
        holder.appPackageNameTxt.text = appModelList[position].getPackages()

        holder.itemView.setOnClickListener {
            val dialogListTitle = arrayOf("Open App", "App Info")
            val builder: AlertDialog.Builder = AlertDialog.Builder(context)
            builder.setTitle("Choose Action")
                .setItems(
                    dialogListTitle
                ) { _, which ->
                    when (which) {
                        0 -> {
                            val intent =
                                context.packageManager.getLaunchIntentForPackage(appModelList[position].getPackages())
                            if (intent != null) {
                                context.startActivity(intent)
                            }else{
                                Toast.makeText(context,"System app is not open for any reason.",Toast.LENGTH_LONG).show()
                            }
                        }
                        1 -> {
                            val intent = Intent()
                            intent.action = Settings.ACTION_APPLICATION_DETAILS_SETTINGS
                            intent.data =
                                Uri.parse("package:${appModelList[position].getPackages()}")
                            context.startActivity(intent)
                        }
                    }
                }
            builder.show()
        }

    }

    override fun getItemCount(): Int {
        return appModelList.size
    }
}

这是菜单 search_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/app_bar_search"
        android:icon="@drawable/ic_search_black_24dp"
        android:title="@string/search"
        app:showAsAction="ifRoom|withText"
        app:actionViewClass="androidx.appcompat.widget.SearchView"/>
</menu>

AllInstalledAppActivity.kt

import android.annotation.SuppressLint
import android.app.Dialog
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.recyclerview.widget.RecyclerView
import com.materialsouk.allcodeapp.models.AppModel

import android.content.pm.PackageInfo

import android.content.pm.ApplicationInfo
import android.os.Handler
import android.os.Looper
import android.view.Menu
import android.widget.LinearLayout
import android.widget.TextView
import androidx.appcompat.widget.SearchView
import com.materialsouk.allcodeapp.adapters.AppAdapter
import java.util.*
import kotlin.collections.ArrayList


class AllInstalledAppActivity : AppCompatActivity() {
    private lateinit var recyclerView: RecyclerView
    private lateinit var installedAppsList: ArrayList<AppModel>
    private lateinit var installedAppAdapter: AppAdapter

    @SuppressLint("SetTextI18n")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_all_installed_app)
        recyclerView = findViewById(R.id.recycler_view)
        val loadingDialog = Dialog(this)
        loadingDialog.setContentView(R.layout.loading)
        loadingDialog.window!!.setLayout(
            LinearLayout.LayoutParams.WRAP_CONTENT,
            LinearLayout.LayoutParams.WRAP_CONTENT
        )
        loadingDialog.setCancelable(false)
        installedAppsList = ArrayList()
        loadingDialog.show()
        Handler(Looper.getMainLooper()).postDelayed({
            getInstalledApps()
            loadingDialog.dismiss()
            findViewById<TextView>(R.id.totalInstalledApp).text =
                "${getString(R.string.total_Installed_Apps)} ${installedAppsList.size}"
            installedAppAdapter = AppAdapter(this, installedAppsList)
            recyclerView.adapter = installedAppAdapter
        }, 500)

    }

    @SuppressLint("QueryPermissionsNeeded")
    private fun getInstalledApps(): ArrayList<AppModel> {
        installedAppsList.clear()
        val packs = packageManager.getInstalledPackages(0)
        for (i in packs.indices) {
            val p = packs[i]
            if (!isSystemPackage(p)) {
                val appName = p.applicationInfo.loadLabel(packageManager).toString()
                val icon = p.applicationInfo.loadIcon(packageManager)
                val packages = p.applicationInfo.packageName
                installedAppsList.add(AppModel(appName, icon, packages))
            }
        }
        installedAppsList.sortBy { it.getName().capitalized() }
        return installedAppsList
    }
    private fun String.capitalized(): String {
        return this.replaceFirstChar {
            if (it.isLowerCase())
                it.titlecase(Locale.getDefault())
            else it.toString()
        }
    }
    private fun isSystemPackage(pkgInfo: PackageInfo): Boolean {
        return pkgInfo.applicationInfo.flags and ApplicationInfo.FLAG_SYSTEM != 0
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        menuInflater.inflate(R.menu.search_menu, menu)
        val search = menu.findItem(R.id.app_bar_search)

        val searchView = search.actionView as SearchView
        searchView.maxWidth = android.R.attr.width
        searchView.queryHint = "Search app name or package"
        searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
            override fun onQueryTextSubmit(query: String?): Boolean {
                return false
            }

            @SuppressLint("NotifyDataSetChanged")
            override fun onQueryTextChange(newText: String?): Boolean {
                val appModelArrayList: ArrayList<AppModel> = ArrayList()

                for (i in installedAppsList) {
                    if (i.getName().lowercase(Locale.getDefault()).contains(
                            newText!!.lowercase(
                                Locale.getDefault()
                            )
                        )
                        ||
                        i.getPackages().lowercase(Locale.getDefault()).contains(
                            newText.lowercase(
                                Locale.getDefault()
                            )
                        )
                    ) {
                        appModelArrayList.add(i)
                    }
                }
                installedAppAdapter =
                    AppAdapter(this@AllInstalledAppActivity, appModelArrayList)

                recyclerView.adapter = installedAppAdapter
                installedAppAdapter.notifyDataSetChanged()
                return true
            }
        })

        return super.onCreateOptionsMenu(menu)
    }
}

你可以用这个:

PackageManager pm = getApplicationContext().getPackageManager();
                List<ResolveInfo> activityList = pm.queryIntentActivities(shareIntent, 0);
                for (final ResolveInfo app : activityList) 
                {
                   if ((app.activityInfo.name).contains("facebook")) 
                   {
                     // facebook  
                   }

                   if ((app.activityInfo.name).contains("android.gm")) 
                   {
                     // gmail  
                   }

                   if ((app.activityInfo.name).contains("mms")) 
                   {
                     // android messaging app
                   }

                   if ((app.activityInfo.name).contains("com.android.bluetooth")) 
                   {
                     // android bluetooth  
                   }
                }