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 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：

1. The ApiDemos project contains examples of using this API:
2. 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;



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(/confirm/iIntent);
   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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