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 " / >

如果在一个包中有多个启动器，上述代码就有问题。例如:在LG Optimus Facebook为LG, MySpace为LG, Twitter为LG包含在一个包的名称SNS，如果你使用上述SNS将重复。经过几个小时的研究，我得到了以下代码。看起来效果不错。

private List<String> getInstalledComponentList()
            throws NameNotFoundException {
        final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> ril = getPackageManager().queryIntentActivities(mainIntent, 0);
        List<String> componentList = new ArrayList<String>();
        String name = null;

        for (ResolveInfo ri : ril) {
            if (ri.activityInfo != null) {
                Resources res = getPackageManager().getResourcesForApplication(ri.activityInfo.applicationInfo);
                if (ri.activityInfo.labelRes != 0) {
                    name = res.getString(ri.activityInfo.labelRes);
                } else {
                    name = ri.activityInfo.applicationInfo.loadLabel(
                            getPackageManager()).toString();
                }
                componentList.add(name);
            }
        }
        return componentList;
    }

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  
                   }
                }

下面是获取Android上安装的活动/应用程序列表的代码:

Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
List<ResolveInfo> pkgAppsList = context.getPackageManager().queryIntentActivities( mainIntent, 0);

您将在ResolveInfo中获得启动应用程序所需的所有数据。你可以在这里检查ResolveInfo javadoc。

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)
    }
}