Android(安卓)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 cmd
2.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:
ApiDemos/src/com/example/android/apis/content/InstallApk*.java.

/** * 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. *  * 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. * 
 * Sessions can install brand new apps, upgrade existing apps, or add new splits * into an existing app. * 
 * 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: * 
 * All APKs must have the exact same package name, version code, and signing * certificates. * 
All APKs must have unique split names. * 
All installations must contain a single base APK. * 
 *  * ###########此处告诉开发者如何调用API安装apk############## * The ApiDemos project contains examples of using this API: * ApiDemos/src/com/example/android/apis/content/InstallApk*.java.   */public class PackageInstaller

翻阅源码，InstallApk*.java相关的一共两个demo
InstallApkSessionApi.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

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