Android P实现静默安装的方法示例(官方Demo)

Android9.0无法通过以下两种方式实现静默安装：

1.runtime执行shell cmd2.PackageInstall 反射机制

但是Google已经给我们推荐了相关的APIDemos，所以建议大家多看看源码~

在frameworks/base/core/java/android/content/pm/PackageInstaller.java有段关于该类的介绍：

The ApiDemos project contains examples of using this API: <code>ApiDemos/src/com/example/android/apis/content/InstallApk*.java</code>.

/** * Offers the ability to install, upgrade, and remove applications on the * device. This includes support for apps packaged either as a single * 'monolithic' APK, or apps packaged as multiple 'split' APKs. * <p> * An app is delivered for installation through a * {@link PackageInstaller.Session}, which any app can create. Once the session * is created, the installer can stream one or more APKs into place until it * decides to either commit or destroy the session. Committing may require user * intervention to complete the installation. * <p> * Sessions can install brand new apps, upgrade existing apps, or add new splits * into an existing app. * <p> * Apps packaged as multiple split APKs always consist of a single 'base' APK * (with a {@code null} split name) and zero or more 'split' APKs (with unique * split names). Any subset of these APKs can be installed together, as long as * the following constraints are met: * <ul> * <li>All APKs must have the exact same package name, version code, and signing * certificates. * <li>All APKs must have unique split names. * <li>All installations must contain a single base APK. * </ul> * <p> * ###########此处告诉开发者如何调用API安装apk############## * The ApiDemos project contains examples of using this API: * <code>ApiDemos/src/com/example/android/apis/content/InstallApk*.java</code>. */public class PackageInstaller

翻阅源码，InstallApk*.java相关的一共两个demoInstallApkSessionApi.java //静默安装InstallApk.java //普通安装，调用系统install intent进行安装

下面是InstallApkSessionApi.java的具体demo

package com.example.android.apis.content;// Need the following import to get access to the app resources, since this// class is in a sub-package.import com.example.android.apis.R;import android.app.Activity;import android.app.PendingIntent;import android.content.Context;import android.content.Intent;import android.content.IntentSender;import android.content.pm.PackageInstaller;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;/** * Demonstration of package installation and uninstallation using the package installer Session * API. * * @see InstallApk for a demo of the original (non-Session) API. */public class InstallApkSessionApi extends Activity { private static final String PACKAGE_INSTALLED_ACTION = 'com.example.android.apis.content.SESSION_API_PACKAGE_INSTALLED'; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.install_apk_session_api); // Watch for button clicks. Button button = (Button) findViewById(R.id.install); button.setOnClickListener(new OnClickListener() { public void onClick(View v) {PackageInstaller.Session session = null;try { PackageInstaller packageInstaller = getPackageManager().getPackageInstaller(); PackageInstaller.SessionParams params = new PackageInstaller.SessionParams( PackageInstaller.SessionParams.MODE_FULL_INSTALL); int sessionId = packageInstaller.createSession(params); session = packageInstaller.openSession(sessionId); addApkToInstallSession('HelloActivity.apk', session); // Create an install status receiver. Context context = InstallApkSessionApi.this; Intent intent = new Intent(context, InstallApkSessionApi.class); intent.setAction(PACKAGE_INSTALLED_ACTION); //此处也可以使用getBoradcast或者getService回调通知 PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0); IntentSender statusReceiver = pendingIntent.getIntentSender(); // Commit the session (this will start the installation workflow). session.commit(statusReceiver);} catch (IOException e) { throw new RuntimeException('Couldn’t install package', e);} catch (RuntimeException e) { if (session != null) { session.abandon(); } throw e;} } }); } private void addApkToInstallSession(String assetName, PackageInstaller.Session session) throws IOException { // It’s recommended to pass the file size to openWrite(). Otherwise installation may fail // if the disk is almost full. try (OutputStream packageInSession = session.openWrite('package', 0, -1); InputStream is = getAssets().open(assetName)) { byte[] buffer = new byte[16384]; int n; while ((n = is.read(buffer)) >= 0) {packageInSession.write(buffer, 0, n); } } } // Note: this Activity must run in singleTop launchMode for it to be able to receive the intent // in onNewIntent(). @Override protected void onNewIntent(Intent intent) { Bundle extras = intent.getExtras(); if (PACKAGE_INSTALLED_ACTION.equals(intent.getAction())) { int status = extras.getInt(PackageInstaller.EXTRA_STATUS); String message = extras.getString(PackageInstaller.EXTRA_STATUS_MESSAGE); switch (status) {case PackageInstaller.STATUS_PENDING_USER_ACTION: // This test app isn’t privileged, so the user has to confirm the install. Intent confirmIntent = (Intent) extras.get(Intent.EXTRA_INTENT); startActivity(confirmIntent); break;case PackageInstaller.STATUS_SUCCESS: Toast.makeText(this, 'Install succeeded!', Toast.LENGTH_SHORT).show(); break;case PackageInstaller.STATUS_FAILURE:case PackageInstaller.STATUS_FAILURE_ABORTED:case PackageInstaller.STATUS_FAILURE_BLOCKED:case PackageInstaller.STATUS_FAILURE_CONFLICT:case PackageInstaller.STATUS_FAILURE_INCOMPATIBLE:case PackageInstaller.STATUS_FAILURE_INVALID:case PackageInstaller.STATUS_FAILURE_STORAGE: Toast.makeText(this, 'Install failed! ' + status + ', ' + message, Toast.LENGTH_SHORT).show(); break;default: Toast.makeText(this, 'Unrecognized status received from installer: ' + status, Toast.LENGTH_SHORT).show(); } } }}

另外，权限要求：

需要系统签名permission

<uses-permission android:name='android.permission.INSTALL_PACKAGES' /><uses-permission android:name='android.permission.READ_EXTERNAL_STORAGE' />

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