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