日期：
来源：郭霖收集编辑：小余的自习室
https://juejin.cn/post/7180373976089100344
<provider
android:authorities="${applicationId}.fileprovider"
android:name="androidx.core.content.FileProvider"
android:exported="false"
android:grantUriPermissions="true"
>
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/update_files"
/>
</provider>
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path
name="external_storage_install"
path="yuhb/install"/>
</paths>
/**
普通应用安装方式
7.0以后需要使用FileProvider进行申请
@param apkFile
@param context
*/
public static void generateInstall(File apkFile, Context context){
if(!apkFile.exists()){
return;
}
Intent intent = getInstallIntent(apkFile, context);
context.startActivity(intent);
}
//获取安装应用的Intent
private static Intent getInstallIntent(File apkFile, Context context) {
Uri data;
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
data = getInstallUri(context,apkFile);
//7.0以后使用FileProvider处理
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.N){
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);//授权其他应用的读权限
intent.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION);//防止app加固下出现授权失败情况
// intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);//授权其他应用写权限
}
intent.setDataAndType(data,"application/vnd.android.package-archive");
return intent;
}
//获取安装文件的uri
private static Uri getInstallUri(Context context,File apkFile) {
Uri data;
//7.0以后使用FileProvider处理
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.N){
data = FileProvider.getUriForFile(context,context.getPackageName()+".fileprovider",apkFile);
}else {
data = Uri.fromFile(apkFile);
}
return data;
}
/**静默安装方式，一般需要root权限或者是厂商自己的系统应用。
@param context
@param apkFilePath
*/
public static void silenceInstallApk(Context context,String apkFilePath) {
/*apkFilePath:这里我们首先传入的是安装包的路径 installObserver:自定义安装的回调，不需要可以删了*/
File apkFile = new File(apkFilePath);
//判断路径下的文件是否存在
if (!apkFile.exists()) {
Log.e(TAG, "apkFile is null...");
return;
}
String packageName = "";
//获取安装包的信息
PackageInfo packageInfo = context.getPackageManager().getPackageArchiveInfo(apkFilePath,
PackageManager.GET_ACTIVITIES | PackageManager.GET_SERVICES);
if (packageInfo != null) {
packageName = packageInfo.packageName;
String versionName = packageInfo.versionName;
}
//获取packageInstaller，后面用来创建PackageInstaller.Session
PackageInstaller packageInstaller = context.getPackageManager().getPackageInstaller();
//获取创建PackageInstaller.Session的参数
PackageInstaller.SessionParams sessionParams = new PackageInstaller.SessionParams(
PackageInstaller.SessionParams.MODE_FULL_INSTALL);
/*指示将在此会话中交付的所有APK的总大小（以字节为单位），系统可以使用它来确保在继续之前存在足够的磁盘空间，
或者估计安装在外部存储上的容器大小*/
sessionParams.setSize(apkFile.length());
PackageInstaller.Session session = null;
try {
//代表一个session的唯一ID,这里我是在全局变量中声明，因为后面的另外一个方法用到了这个sessionId
int mSessionId = packageInstaller.createSession(sessionParams);
if (mSessionId != -1) {
//也就是在这个外部的onTransfesApkFile()方法中，将会用到sessionId
boolean copySuccess = onTransfesApkFile(mSessionId,context,apkFilePath, packageName);
if (copySuccess) {
session = context.getPackageManager().getPackageInstaller().openSession(mSessionId);
//设置安装完成后需要发送的一个自定义安装结果广播，这里我设置了App的NAME，VERSION，PACKAGE
Intent intent = new Intent(context,
InstallResultReceiver.class);
intent.setAction(PackageInstaller.EXTRA_STATUS);
intent.putExtra("APP_VERSION", "1.0");
intent.putExtra("APP_PACKAGE", "com.allinpay.manager");
//执行结束后，发送intent
PendingIntent pendingIntent = PendingIntent.getBroadcast(context,1,
intent, PendingIntent.FLAG_UPDATE_CURRENT);
//这里最终进行session的提交
session.commit(pendingIntent.getIntentSender());
} else {
//此处是安装失败的回调，不需要可以删除
// if (installObserver != null) {
// installObserver.observer(false, apkFilePath, packageName);
// }
}
}
} catch (Exception exception) {
Log.e(TAG, "installApk exception = " + exception.getLocalizedMessage());
} finally {
if (null != session) {
session.close();
}
//安装完成需要删除文件
if (apkFile != null && apkFile.exists()) {
// apkFile.delete();
}
}
}
private static boolean onTransfesApkFile(int mSessionId,Context context,String apkFilePath, String packageName) {
InputStream in = null;
OutputStream out = null;
PackageInstaller.Session session = null;
boolean success = false;
try {
File apkFile = new File(apkFilePath);
//根据sessionId来获取其代表的session
session = context.getPackageManager().getPackageInstaller().openSession(mSessionId);
//向session中写入文件数据
out = session.openWrite(packageName + "_base.apk", 0, apkFile.length());
in = new FileInputStream(apkFile);
int total = 0;
int len;
byte[] buffer = new byte[1024];
while ((len = in.read(buffer)) != -1) {
total += len;
out.write(buffer, 0, len);
}
session.fsync(out);
success = true;
} catch (IOException exception) {
exception.printStackTrace();
} finally {
if (null != session) {
session.close();
}
try {
if (null != out) {
out.close();
}
if (null != in) {
in.close();
}
} catch (IOException exception) {
exception.printStackTrace();
}
}
return success;
}
/**
Select which activity is the first visible activity of the installation and forward the intent to it.
*/
public class InstallStart extends Activity {
protected void onCreate(@Nullable Bundle savedInstanceState) {
...
Uri packageUri = intent.getData();
//如果Scheme是Content格式
if (packageUri != null && packageUri.getScheme().equals(
ContentResolver.SCHEME_CONTENT)) {
// [IMPORTANT] This path is deprecated, but should still work. Only necessary
// features should be added.
// Copy file to prevent it from being changed underneath this process
nextActivity.setClass(this, InstallStaging.class);
//如果Scheme是package格式
} else if (packageUri != null && packageUri.getScheme().equals(
PackageInstallerActivity.SCHEME_PACKAGE)) {
nextActivity.setClass(this, PackageInstallerActivity.class);
//如果Scheme是其他格式
} else {
Intent result = new Intent();
result.putExtra(Intent.EXTRA_INSTALL_RESULT,
PackageManager.INSTALL_FAILED_INVALID_URI);
setResult(RESULT_FIRST_USER, result);
nextActivity = null;
}
if (nextActivity != null) {
startActivity(nextActivity);
}
finish();
```
}
//frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/InstallStaging.java
public class InstallStaging extends AlertActivity {
protected void onResume() {
...
mStagingTask = new StagingAsyncTask();
//执行StagingAsyncTask
mStagingTask.execute(getIntent().getData());
}
private final class StagingAsyncTask extends AsyncTask<Uri, Void, Boolean> {
@Override
protected Boolean doInBackground(Uri... params) {
if (params == null || params.length <= 0) {
return false;
}
Uri packageUri = params[0];
try (InputStream in = getContentResolver().openInputStream(packageUri)) {
// Despite the comments in ContentResolver#openInputStream the returned stream can
// be null.
if (in == null) {
return false;
}
try (OutputStream out = new FileOutputStream(mStagedFile)) {
byte[] buffer = new byte[1024 * 1024];
int bytesRead;
while ((bytesRead = in.read(buffer)) >= 0) {
// Be nice and respond to a cancellation
if (isCancelled()) {
return false;
}
out.write(buffer, 0, bytesRead);
}
}
} catch (IOException | SecurityException | IllegalStateException e) {
Log.w(LOG_TAG, "Error staging apk from content URI", e);
return false;
}
return true;
}
@Override
protected void onPostExecute(Boolean success) {
if (success) {
// Now start the installation again from a file
Intent installIntent = new Intent(getIntent());
installIntent.setClass(InstallStaging.this, DeleteStagedFileOnResult.class);
installIntent.setData(Uri.fromFile(mStagedFile));
if (installIntent.getBooleanExtra(Intent.EXTRA_RETURN_RESULT, false)) {
installIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
}
installIntent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(installIntent);
InstallStaging.this.finish();
} else {
showError();
}
}
}
}
/**
* Trampoline activity. Calls PackageInstallerActivity and deletes staged install file onResult.
*/
public class DeleteStagedFileOnResult extends Activity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState == null) {
Intent installIntent = new Intent(getIntent());
installIntent.setClass(this, PackageInstallerActivity.class);
installIntent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivityForResult(installIntent, 0);
}
}
//frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/PackageInstallerActivity.java
private void startInstall() {
// Start subactivity to actually install the application
Intent newIntent = new Intent();
newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO,
mPkgInfo.applicationInfo);
newIntent.setData(mPackageURI);
newIntent.setClass(this, InstallInstalling.class);
String installerPackageName = getIntent().getStringExtra(
Intent.EXTRA_INSTALLER_PACKAGE_NAME);
if (mOriginatingURI != null) {
newIntent.putExtra(Intent.EXTRA_ORIGINATING_URI, mOriginatingURI);
}
if (mReferrerURI != null) {
newIntent.putExtra(Intent.EXTRA_REFERRER, mReferrerURI);
}
if (mOriginatingUid != PackageInstaller.SessionParams.UID_UNKNOWN) {
newIntent.putExtra(Intent.EXTRA_ORIGINATING_UID, mOriginatingUid);
}
if (installerPackageName != null) {
newIntent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME,
installerPackageName);
}
if (getIntent().getBooleanExtra(Intent.EXTRA_RETURN_RESULT, false)) {
newIntent.putExtra(Intent.EXTRA_RETURN_RESULT, true);
}
newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
if (mLocalLOGV) Log.i(TAG, "downloaded app uri=" + mPackageURI);
startActivity(newIntent);
finish();
}
//frameworks/base/packages/PackageInstaller/src/com/android/packageinstaller/InstallInstalling.java
public class InstallInstalling extends AlertActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
PackageInstaller.SessionParams params = new PackageInstaller.SessionParams(
PackageInstaller.SessionParams.MODE_FULL_INSTALL);
...
//注册一个安装结果监听器launchFinishBasedOnResult
mInstallId = InstallEventReceiver
.addObserver(this, EventResultPersister.GENERATE_NEW_ID,
this::launchFinishBasedOnResult);
...
//创建一个createSession
mSessionId = getPackageManager().getPackageInstaller().createSession(params);
}
@Override
protected void onResume() {
//启动一个InstallingAsyncTask
mInstallingTask = new InstallingAsyncTask();
mInstallingTask.execute();
}
private final class InstallingAsyncTask extends AsyncTask<Void, Void,
PackageInstaller.Session> {
@Override
protected PackageInstaller.Session doInBackground(Void... params) {
PackageInstaller.Session session;
try {
//打开Session
session = getPackageManager().getPackageInstaller().openSession(mSessionId);
} catch (IOException e) {
}
//设置session安装进度
session.setStagingProgress(0);
try {
File file = new File(mPackageURI.getPath());
try (InputStream in = new FileInputStream(file)) {
long sizeBytes = file.length();
try (OutputStream out = session
.openWrite("PackageInstaller", 0, sizeBytes)) {
byte[] buffer = new byte[1024 * 1024];
while (true) {
int numRead = in.read(buffer);
if (numRead == -1) {
session.fsync(out);
break;
}
if (isCancelled()) {
session.close();
break;
}
out.write(buffer, 0, numRead);
if (sizeBytes > 0) {
float fraction = ((float) numRead / (float) sizeBytes);
session.addProgress(fraction);
}
}
}
}
return session;
} catch (IOException | SecurityException e) {
}
}
@Override
protected void onPostExecute(PackageInstaller.Session session) {
if (session != null) {
//注册一个broadcastIntent监听安装结果：BROADCAST_ACTION = "com.android.packageinstaller.ACTION_INSTALL_COMMIT";
Intent broadcastIntent = new Intent(BROADCAST_ACTION);
broadcastIntent.setFlags(Intent.FLAG_RECEIVER_FOREGROUND);
broadcastIntent.setPackage(getPackageName());
broadcastIntent.putExtra(EventResultPersister.EXTRA_ID, mInstallId);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
InstallInstalling.this,
mInstallId,
broadcastIntent,
PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_MUTABLE);
//调用commit进行安装
session.commit(pendingIntent.getIntentSender());
mCancelButton.setEnabled(false);
setFinishOnTouchOutside(false);
}
}
}
}
}
//frameworks/base/core/java/android/app/ContextImpl.java
public PackageManager getPackageManager() {
if (mPackageManager != null) {
return mPackageManager;
}
final IPackageManager pm = ActivityThread.getPackageManager();
if (pm != null) {
// Doesn't matter if we make more than one instance.
return (mPackageManager = new ApplicationPackageManager(this, pm));
}
return null;
}
//frameworks/base/core/java/android/app/ActivityThread.java
public static IPackageManager getPackageManager() {
if (sPackageManager != null) {
return sPackageManager;
}
final IBinder b = ServiceManager.getService("package");
sPackageManager = IPackageManager.Stub.asInterface(b);
return sPackageManager;
}
//构造IPackageManagerImpl对象并将其add到ServiceManager中：name为package
IPackageManagerImpl iPackageManager = m.new IPackageManagerImpl();
ServiceManager.addService("package", iPackageManager);
//frameworks/base/core/java/android/app/ApplicationPackageManager.java
public PackageInstaller getPackageInstaller() {
if (mInstaller == null) {
try {
mInstaller = new PackageInstaller(mPM.getPackageInstaller(),
mContext.getPackageName(), mContext.getAttributionTag(), getUserId());
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
return mInstaller;
}
//frameworks/base/services/core/java/com/android/server/pm/IPackageManagerBase.java
public final IPackageInstaller getPackageInstaller() {
...
return mInstallerService;
}
//frameworks/base/core/java/android/content/pm/PackageInstaller.java
public int createSession(@NonNull SessionParams params) throws IOException {
//mInstaller为PackageInstallerService
return mInstaller.createSession(params, mInstallerPackageName, mAttributionTag,
mUserId);
}
PackageInstallerService的createSession方法会调用内置的createSessionInternal方法
private int createSessionInternal(SessionParams params, String installerPackageName...){
//前面一大堆对Session创建的条件进行判断，不满足创建则抛出异常
//创建随机数的sessionId
sessionId = allocateSessionIdLocked();
//创建SessionDir
stageDir = buildSessionDir(sessionId, params);
//InstallSource持有应用安装的apk源文件信息
InstallSource installSource = InstallSource.create(installerPackageName,
originatingPackageName, requestedInstallerPackageName,
installerAttributionTag, params.packageSource);
//创建session ：PackageInstallerSession
session = new PackageInstallerSession(mInternalCallback, mContext, mPm, this,
mSilentUpdatePolicy, mInstallThread.getLooper(), mStagingManager, sessionId,
userId, callingUid, installSource, params, createdMillis, 0L, stageDir, stageCid,
null, null, false, false, false, false, null, SessionInfo.INVALID_ID,
false, false, false, PackageManager.INSTALL_UNKNOWN, "");
//将session放入到mSessions键值对中，key为sessionId
synchronized (mSessions) {
mSessions.put(sessionId, session);
}
//将InstallSource放入到PKMS的Setting集合中
mPm.addInstallerPackageName(session.getInstallSource());
}
private IPackageInstallerSession openSessionInternal(int sessionId) throws IOException {
synchronized (mSessions) {
final PackageInstallerSession session = mSessions.get(sessionId);
if (!checkOpenSessionAccess(session)) {
throw new SecurityException("Caller has no access to session " + sessionId);
}
session.open();
return session;
}
}
//frameworks/base/services/core/java/com/android/server/pm/PackageInstallerSession.java
public void open() throws IOException {
...
boolean wasPrepared;
synchronized (mLock) {
wasPrepared = mPrepared;
if (!mPrepared) {
if (stageDir != null) {
prepareStageDir(stageDir);
}
mPrepared = true;
}
}
}
static void prepareStageDir(File stageDir) throws IOException {
try {
Os.mkdir(stageDir.getAbsolutePath(), 0775);
Os.chmod(stageDir.getAbsolutePath(), 0775);
} catch (ErrnoException e) {
}
}
public void commit(@NonNull IntentSender statusReceiver, boolean forTransfer) {
...
dispatchSessionSealed();
}
private void dispatchSessionSealed() {
mHandler.obtainMessage(MSG_ON_SESSION_SEALED).sendToTarget();
}
private final Handler.Callback mHandlerCallback = new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
switch (msg.what) {
case MSG_ON_SESSION_SEALED:
//内部发射一个MSG_STREAM_VALIDATE_AND_COMMIT msg
handleSessionSealed();
break;
case MSG_STREAM_VALIDATE_AND_COMMIT:
//内部发射一个MSG_INSTALL msg
handleStreamValidateAndCommit();
break;
case MSG_INSTALL:
//处理应用安装过程
handleInstall();
break;
case MSG_ON_PACKAGE_INSTALLED:
final SomeArgs args = (SomeArgs) msg.obj;
final String packageName = (String) args.arg1;
final String message = (String) args.arg2;
final Bundle extras = (Bundle) args.arg3;
final IntentSender statusReceiver = (IntentSender) args.arg4;
final int returnCode = args.argi1;
args.recycle();
sendOnPackageInstalled(mContext, statusReceiver, sessionId,
isInstallerDeviceOwnerOrAffiliatedProfileOwner(), userId,
packageName, returnCode, message, extras);
break;
case MSG_SESSION_VALIDATION_FAILURE:
final int error = msg.arg1;
final String detailMessage = (String) msg.obj;
onSessionValidationFailure(error, detailMessage);
break;
}
return true;
}
};
@WorkerThread
private void handleInstall() {
...
if (params.isStaged) {
mStagedSession.verifySession();
} else {
verify();
}
}
private void verify() {
try {
//1.创建安装apk需要的文件夹：
prepareInheritedFiles();
//2.解析APK文件并提取so库文件。其实就是解析AndroidManfest中的四大组件信息
parseApkAndExtractNativeLibraries();
//3.检验apk的过程
verifyNonStaged();
} catch (PackageManagerException e) {
final String completeMsg = ExceptionUtils.getCompleteMessage(e);
final String errorMsg = PackageManager.installStatusToString(e.error, completeMsg);
setSessionFailed(e.error, errorMsg);
onSessionVerificationFailure(e.error, errorMsg);
}
}
//frameworks/base/services/core/java/com/android/server/pm/PackageSessionVerifier.java
private void verifyAPK(PackageInstallerSession session, Callback callback)
throws PackageManagerException {
final IPackageInstallObserver2 observer = new IPackageInstallObserver2.Stub() {
@Override
public void onUserActionRequired(Intent intent) {
throw new IllegalStateException();
}
@Override
public void onPackageInstalled(String basePackageName, int returnCode, String msg,
Bundle extras) {
if (session.isStaged() && returnCode == PackageManager.INSTALL_SUCCEEDED) {
// Continue verification for staged sessions
verifyStaged(session.mStagedSession, callback);
return;
}
if (returnCode != PackageManager.INSTALL_SUCCEEDED) {
String errorMessage = PackageManager.installStatusToString(returnCode, msg);
session.setSessionFailed(returnCode, errorMessage);
callback.onResult(returnCode, msg);
} else {
session.setSessionReady();
callback.onResult(PackageManager.INSTALL_SUCCEEDED, null);
}
}
};
final VerificationParams verifyingSession = makeVerificationParams(session, observer);
...
verifyingSession.verifyStage();
}
frameworks/base/services/core/java/com/android/server/pm/VerificationParams.java
public void verifyStage() {
mPm.mHandler.post(this::startCopy);
}
final void startCopy() {
handleStartCopy();
handleReturnCode();
}
public void handleStartCopy() {
//获取需要安装的apk包信息
PackageInfoLite pkgLite = PackageManagerServiceUtils.getMinimalPackageInfo(mPm.mContext,
mPackageLite, mOriginInfo.mResolvedPath, mInstallFlags, mPackageAbiOverride);
//校验需要更新的app的VersionCode，这里面会对VersionCode版本和原始版本进行校验。
Pair<Integer, String> ret = mInstallPackageHelper.verifyReplacingVersionCode(
pkgLite, mRequiredInstalledVersionCode, mInstallFlags);
if (!mOriginInfo.mExisting) {
//如果是PackageManager.INSTALL_APEX不是APEX包，也就是apk包，则调用sendApkVerificationRequest对APK包进行更新
if ((mInstallFlags & PackageManager.INSTALL_APEX) == 0) {
sendApkVerificationRequest(pkgLite);//关注点1
}
//回溯版本走的
if ((mInstallFlags & PackageManager.INSTALL_ENABLE_ROLLBACK) != 0) {
sendEnableRollbackRequest();
}
}
}
//关注点1
private void sendApkVerificationRequest(PackageInfoLite pkgLite) {
...
//发送完整的校验请求
sendIntegrityVerificationRequest(verificationId, pkgLite, verificationState);
//发送package安装包校验
sendPackageVerificationRequest(
verificationId, pkgLite, verificationState);
...
}
//frameworks/base/services/core/java/com/android/server/pm/VerificationParams.java
void handleReturnCode() {
sendVerificationCompleteNotification();
}
private void sendVerificationCompleteNotification() {
...
try {
mObserver.onPackageInstalled(null, mRet, mErrorMessage,
new Bundle());
} catch (RemoteException e) {
Slog.i(TAG, "Observer no longer exists.");
}
...
}
final IPackageInstallObserver2 observer = new IPackageInstallObserver2.Stub() {
@Override
public void onPackageInstalled(String basePackageName, int returnCode, String msg,
Bundle extras) {
...
if (returnCode != PackageManager.INSTALL_SUCCEEDED) {
String errorMessage = PackageManager.installStatusToString(returnCode, msg);
session.setSessionFailed(returnCode, errorMessage);
callback.onResult(returnCode, msg);
} else {
session.setSessionReady();
callback.onResult(PackageManager.INSTALL_SUCCEEDED, null);
}
}
};
private void verifyNonStaged()
throws PackageManagerException {
mSessionProvider.getSessionVerifier().verify(this, (error, msg) -> {
mHandler.post(() -> {
if (dispatchPendingAbandonCallback()) {
// No need to continue if abandoned
return;
}
if (error == INSTALL_SUCCEEDED) {
onVerificationComplete();
} else {
onSessionVerificationFailure(error, msg);
}
});
});
}
@WorkerThread
private void onVerificationComplete() {
...
install();
}
private CompletableFuture<Void> install() {
List<CompletableFuture<InstallResult>> futures = installNonStaged();
...
}
private List<CompletableFuture<InstallResult>> installNonStaged() {
...
final InstallParams installingSession = makeInstallParams(future);
installingSession.installStage();
...
}
frameworks/base/services/core/java/com/android/server/pm/InstallParams.java
public void installStage() {
final Message msg = mPm.mHandler.obtainMessage(INIT_COPY);
msg.obj = this;
mPm.mHandler.sendMessage(msg);
}
final class PackageHandler extends Handler {
@Override
public void handleMessage(Message msg) {
try {
doHandleMessage(msg);
} finally {
Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT);
}
}
void doHandleMessage(Message msg) {
switch (msg.what) {
case INIT_COPY: {
HandlerParams params = (HandlerParams) msg.obj;
if (params != null) {
...
params.startCopy();
}
break;
}
}
}
}
final void startCopy() {
handleStartCopy();//关注点1
handleReturnCode();//关注点2
}
//frameworks/base/services/core/java/com/android/server/pm/InstallParams.java
public void handleStartCopy() {
PackageInfoLite pkgLite = PackageManagerServiceUtils.getMinimalPackageInfo(mPm.mContext,
mPackageLite, mOriginInfo.mResolvedPath, mInstallFlags, mPackageAbiOverride);
if (!mOriginInfo.mStaged && pkgLite.recommendedInstallLocation
== InstallLocationUtils.RECOMMEND_FAILED_INSUFFICIENT_STORAGE) {
//先释放一部分不需要的缓存。
pkgLite.recommendedInstallLocation = mPm.freeCacheForInstallation(
pkgLite.recommendedInstallLocation, mPackageLite,
mOriginInfo.mResolvedPath, mPackageAbiOverride, mInstallFlags);
}
//根据默认的规则重写安装路径，主要是区分使用外置sdcard路径还是内置路径
mRet = overrideInstallLocation(pkgLite.packageName, pkgLite.recommendedInstallLocation,
pkgLite.installLocation);
}
再看关注点2：
void handleReturnCode() {
processPendingInstall();
}
private void processPendingInstall() {
//创建安装的参数信息
InstallArgs args = createInstallArgs(this);
if (mRet == PackageManager.INSTALL_SUCCEEDED) {
//关注点3 拷贝apk
mRet = args.copyApk();
}
if (mRet == PackageManager.INSTALL_SUCCEEDED) {
F2fsUtils.releaseCompressedBlocks(
mPm.mContext.getContentResolver(), new File(args.getCodePath()));
}
if (mParentInstallParams != null) {
mParentInstallParams.tryProcessInstallRequest(args, mRet);
} else {
PackageInstalledInfo res = new PackageInstalledInfo(mRet);
//关注点4
processInstallRequestsAsync(
res.mReturnCode == PackageManager.INSTALL_SUCCEEDED,
Collections.singletonList(new InstallRequest(args, res)));
}
}
//frameworks/base/services/core/java/com/android/server/pm/FileInstallArgs.java
int copyApk() {
return doCopyApk();
}
private int doCopyApk() {
//1.给StageDir分配对应的临时文件夹以及权限
final File tempDir = mPm.mInstallerService.allocateStageDirLegacy(mVolumeUuid, isEphemeral);
mCodeFile = tempDir;
//2.拷贝Package，这里面主要是四大组件信息的拷贝
int ret = PackageManagerServiceUtils.copyPackage(
mOriginInfo.mFile.getAbsolutePath(), mCodeFile);
//3.根据abifilter 拷贝NativeLibrary ,so库到对应的lib目录下
handle = NativeLibraryHelper.Handle.create(mCodeFile);
ret = NativeLibraryHelper.copyNativeBinariesWithOverride(handle, libraryRoot,
mAbiOverride, isIncremental);
return ret;
}
public File allocateStageDirLegacy(String volumeUuid, boolean isEphemeral) throws IOException {
synchronized (mSessions) {
try {
final int sessionId = allocateSessionIdLocked();
mLegacySessions.put(sessionId, true);
final File sessionStageDir = buildTmpSessionDir(sessionId, volumeUuid);
prepareStageDir(sessionStageDir);
return sessionStageDir;
} catch (IllegalStateException e) {
throw new IOException(e);
}
}
}
public static int copyPackage(String packagePath, File targetDir) {
try {
final File packageFile = new File(packagePath);
//解析APK文件到ParseResult中
final ParseResult<PackageLite> result = ApkLiteParseUtils.parsePackageLite(
input.reset(), packageFile, /* flags */ 0);
//获取apk的文件PackageLite信息
final PackageLite pkg = result.getResult();
//拷贝file，核心方法
copyFile(pkg.getBaseApkPath(), targetDir, "base.apk");
return PackageManager.INSTALL_SUCCEEDED;
} catch (IOException | ErrnoException e) {
}
}
private static void copyFile(String sourcePath, File targetDir, String targetName)
throws ErrnoException, IOException {
final File targetFile = new File(targetDir, targetName);
final FileDescriptor targetFd = Os.open(targetFile.getAbsolutePath(),
O_RDWR | O_CREAT, 0644);
Os.chmod(targetFile.getAbsolutePath(), 0644);
FileInputStream source = null;
try {
source = new FileInputStream(sourcePath);
FileUtils.copy(source.getFD(), targetFd);
} finally {
IoUtils.closeQuietly(source);
}
}
// Queue up an async operation since the package installation may take a little while.
private void processInstallRequestsAsync(boolean success,
List<InstallRequest> installRequests) {
mPm.mHandler.post(() -> {
mInstallPackageHelper.processInstallRequests(success, installRequests);
});
}
frameworks/base/services/core/java/com/android/server/pm/InstallPackageHelper.java
public void processInstallRequests(boolean success, List<InstallRequest> installRequests) {
List<InstallRequest> apkInstallRequests = new ArrayList<>();
for (InstallRequest request : installRequests) {
...
apkInstallRequests.add(request);
}
if (success) {
for (InstallRequest request : apkInstallRequests) {
//预安装，内部主要是做clean操作
request.mArgs.doPreInstall(request.mInstallResult.mReturnCode);
}
synchronized (mPm.mInstallLock) {
//实际安装apk过程
installPackagesTracedLI(apkInstallRequests);
}
}
...
}
private void installPackagesTracedLI(List<InstallRequest> requests) {
...
installPackagesLI(requests);
...
}
private void installPackagesLI(List<InstallRequest> requests) {
for (InstallRequest request : requests) {
//阶段1：prepare阶段
repareResult = preparePackageLI(request.mArgs, request.mInstallResult);
//阶段2：scan阶段
final ScanResult result = scanPackageTracedLI(
prepareResult.mPackageToScan, prepareResult.mParseFlags,
prepareResult.mScanFlags, System.currentTimeMillis(),
request.mArgs.mUser, request.mArgs.mAbiOverride);
}
//阶段3：Reconcile阶段
reconciledPackages = ReconcilePackageUtils.reconcilePackages(
reconcileRequest, mSharedLibraries,
mPm.mSettings.getKeySetManagerService(), mPm.mSettings);
}
commitRequest = new CommitRequest(reconciledPackages,
mPm.mUserManager.getUserIds());
//阶段4：Commit阶段
commitPackagesLocked(commitRequest);
//阶段5：完成apk安装
executePostCommitSteps(commitRequest);
}
private void executePostCommitSteps(CommitRequest commitRequest) {
for (ReconciledPackage reconciledPkg : commitRequest.mReconciledPackages.values()) {
// prepareAppDataPostCommitLIF经过一系列调用会走到Installer的createAppData方法。
mAppDataHelper.prepareAppDataPostCommitLIF(pkg, 0);
/*
检测是否需要进行dex优化：同时满足下面三种情况就需要
1.不是一个即时应用app或者如果是的话通过gservices进行dex优化操作
2.debuggable为false
3.不在增量文件系统上。
*/
final boolean performDexopt =
(!instantApp || android.provider.Settings.Global.getInt(
mContext.getContentResolver(),
android.provider.Settings.Global.INSTANT_APP_DEXOPT_ENABLED, 0) != 0)
&& !pkg.isDebuggable()
&& (!onIncremental)
&& dexoptOptions.isCompilationEnabled();
if (performDexopt) {
//获取so库所在的目录
PackageSetting realPkgSetting = result.mExistingSettingCopied
? result.mRequest.mPkgSetting : result.mPkgSetting;
boolean isUpdatedSystemApp = reconciledPkg.mPkgSetting.getPkgState()
.isUpdatedSystemApp();
//更新系统app信息。
realPkgSetting.getPkgState().setUpdatedSystemApp(isUpdatedSystemApp);
//进行dex优化
mPackageDexOptimizer.performDexOpt(pkg, realPkgSetting,
null /* instructionSets */,
mPm.getOrCreateCompilerPackageStats(pkg),
mDexManager.getPackageUseInfoOrDefault(packageName),
dexoptOptions);
}
//通知BackgroundDexOptService服务当前packageName的应用进行了更新。
BackgroundDexOptService.getService().notifyPackageChanged(packageName);
notifyPackageChangeObserversOnUpdate(reconciledPkg);
}
}
public @NonNull CreateAppDataResult createAppData(@NonNull CreateAppDataArgs args)
throws InstallerException {
...
try {
return mInstalld.createAppData(args);
} catch (Exception e) {
throw InstallerException.from(e);
}
}