• 场景

1. 定制机是Android 11版本的，app使用的系统签名，在底层系统原生桌面删除掉了，将本app设置为桌面。
2. 效果就是开机自动启动，不会退出。

• 需求
  1.设备无root权限。
  2.app使用系统签名。
  3.app需要静默升级，不让用户手动点击升级按钮。

• 实现
  1.先加权限

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

2.安装包存放到了 "storage/emulated/0/****.apk"

//调用
PackageManagerCompatP.install(UpgradeFirmwareActivity.this,Configs.DOWN_DIR_PATH + Configs.DOWN_APK, getPackageManager());

3.具体实现

import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInstaller;
import android.content.pm.PackageManager;
import android.os.Build;
import android.util.Log;

import androidx.annotation.RequiresApi;

import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class PackageManagerCompatP {
 
    private static final String TAG = PackageManagerCompatP.class.getSimpleName();
 
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public static void install(Context context, String apkFilePath, PackageManager packageManager) {
        File apkFile = new File(apkFilePath);
        PackageInstaller packageInstaller = packageManager.getPackageInstaller();
        PackageInstaller.SessionParams sessionParams = new PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL);
        sessionParams.setSize(apkFile.length());
 
        int sessionId = createSession(packageInstaller, sessionParams);
        if (sessionId != -1) {
            boolean copySuccess = copyInstallFile(packageInstaller, sessionId, apkFilePath);
            Log.d(TAG,"install: " + copySuccess);
            if (copySuccess) {
                execInstallCommand(context, packageInstaller, sessionId);
            }
        }
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private static int createSession(PackageInstaller packageInstaller,
                              PackageInstaller.SessionParams sessionParams) {
        int sessionId = -1;
        try {
            sessionId = packageInstaller.createSession(sessionParams);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sessionId;
    }
 
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private static boolean copyInstallFile(PackageInstaller packageInstaller,
                                    int sessionId, String apkFilePath) {
        InputStream in = null;
        OutputStream out = null;
        PackageInstaller.Session session = null;
        boolean success = false;
        try {
            File apkFile = new File(apkFilePath);
            session = packageInstaller.openSession(sessionId);
            out = session.openWrite("base.apk", 0, apkFile.length());
            in = new FileInputStream(apkFile);
            int total = 0, c;
            byte[] buffer = new byte[65536];
            while ((c = in.read(buffer)) != -1) {
                total += c;
                out.write(buffer, 0, c);
            }
            session.fsync(out);
            success = true;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            closeQuietly(out);
            closeQuietly(in);
            closeQuietly(session);
        }
        return success;
    }
 
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private static void execInstallCommand(Context context, PackageInstaller packageInstaller, int sessionId) {
        PackageInstaller.Session session = null;
        try {
            session = packageInstaller.openSession(sessionId);
            Intent intent = new Intent(context, InstallReceiver.class);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            session.commit(pendingIntent.getIntentSender());
            Log.d(TAG,"execInstallCommand: ");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            closeQuietly(session);
        }
    }
    private static void closeQuietly(Closeable c) {
        if (c != null) {
            try {
                c.close();
            } catch (IOException ignored) {
                ignored.printStackTrace();
            }
        }
    }
}

接收安装完成消息
如果app自己静默升级的话，接收不到消息。
因为我的项目是设置为了桌面，安装完成会自动重启，不需要在代码中操作。

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInstaller;
import android.util.Log;

public class InstallReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("InstallReceiver", "onReceive: " + intent.getIntExtra(PackageInstaller.EXTRA_STATUS, PackageInstaller.STATUS_FAILURE));
        final int status = intent.getIntExtra(PackageInstaller.EXTRA_STATUS, PackageInstaller.STATUS_FAILURE);
        if (status == PackageInstaller.STATUS_SUCCESS) {
            Log.d("InstallReceiver", "onReceive: true");
        } else {
            Log.d("InstallReceiver", "onReceive: false");
        }
    }
}

清单文件注册

<receiver android:name="包名.InstallReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="android.content.pm.extra.STATUS"/>
            </intent-filter>
        </receiver>

• 坑：
  需要将 AndroidManifest.xml 中下面的标签去除
  android:persistent="true"

• 后语：代码来源于网络