編輯：關於Android編程
今天簡單講解一下PackageInstaller
文件路徑：
下面開始講解：
首先，我們說一下安裝apk的幾種方式，整體上可以分為2類，一類是有界面安裝，一類是無界面安裝。無界面安裝分為內置apk開機安裝和命令安裝，命令安裝又分為兩類，一類電腦安裝也就是adb命令，另一類是手機安裝也就是pm命令。今天我們主要介紹有界面安裝。
當然，我們從這個安裝界面說起，這個界面是那個呢？就是PackageInstallerActivity這個acitvity。它是如何啟動起來的呢？我們去看看它在AndroidManifest是如何定義的
String apkFileString = Environment.getExternalStorageDirectory().getAbsolutePath()+/.../packageName.pac; File apkFile = new File(apkFileString); Intent intent = new Intent(Intent.ACTION_VIEW); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setDataAndType(Uri.fromFile(apkFile), application/vnd.android.package-archive); mContext.startActivity(intent);
final Intent intent = getIntent();
mPackageURI = intent.getData();
mPm = getPackageManager();
mPkgInfo = PackageUtil.getPackageInfo(mPackageURI);
獲取到，我們剛才傳進來的apkFile的Uri給了mPackageURI，接著獲取到PackageManager，然後生成一個mPkgInfo也就是PackageParser.Package，這個很重要。我們看看PackageParser.Package是如何生成的，PackageParser.Package裡面都包含了什麼東西。那我們就要去PackageUtil.getPackageInfo中了
public static PackageParser.Package getPackageInfo(Uri packageURI) {
final String archiveFilePath = packageURI.getPath();
PackageParser packageParser = new PackageParser(archiveFilePath);
File sourceFile = new File(archiveFilePath);
DisplayMetrics metrics = new DisplayMetrics();
metrics.setToDefaults();
PackageParser.Package pkg = packageParser.parsePackage(sourceFile,
archiveFilePath, metrics, 0);
// Nuke the parser reference.
packageParser = null;
return pkg;
}
public Package parsePackage(File sourceFile, String destCodePath,
DisplayMetrics metrics, int flags) {
mParseError = PackageManager.INSTALL_SUCCEEDED;
mArchiveSourcePath = sourceFile.getPath();
if (!sourceFile.isFile()) {
Slog.w(TAG, Skipping dir: + mArchiveSourcePath);
mParseError = PackageManager.INSTALL_PARSE_FAILED_NOT_APK;
return null;
}
if (!isPackageFilename(sourceFile.getName())
&& (flags&PARSE_MUST_BE_APK) != 0) {
if ((flags&PARSE_IS_SYSTEM) == 0) {
// We expect to have non-.apk files in the system dir,
// so don't warn about them.
Slog.w(TAG, Skipping non-package file: + mArchiveSourcePath);
}
mParseError = PackageManager.INSTALL_PARSE_FAILED_NOT_APK;
return null;
}
if (DEBUG_JAR)
Slog.d(TAG, Scanning package: + mArchiveSourcePath);
XmlResourceParser parser = null;
AssetManager assmgr = null;
Resources res = null;
boolean assetError = true;
try {
assmgr = new AssetManager();
int cookie = assmgr.addAssetPath(mArchiveSourcePath);
if (cookie != 0) {
res = new Resources(assmgr, metrics, null);
assmgr.setConfiguration(0, 0, null, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Build.VERSION.RESOURCES_SDK_INT);
parser = assmgr.openXmlResourceParser(cookie, ANDROID_MANIFEST_FILENAME);
assetError = false;
} else {
Slog.w(TAG, Failed adding asset path:+mArchiveSourcePath);
}
} catch (Exception e) {
Slog.w(TAG, Unable to read AndroidManifest.xml of
+ mArchiveSourcePath, e);
}
if (assetError) {
if (assmgr != null) assmgr.close();
mParseError = PackageManager.INSTALL_PARSE_FAILED_BAD_MANIFEST;
return null;
}
String[] errorText = new String[1];
Package pkg = null;
Exception errorException = null;
try {
// XXXX todo: need to figure out correct configuration.
pkg = parsePackage(res, parser, flags, errorText);
} catch (Exception e) {
errorException = e;
mParseError = PackageManager.INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION;
}
if (pkg == null) {
// If we are only parsing core apps, then a null with INSTALL_SUCCEEDED
// just means to skip this app so don't make a fuss about it.
if (!mOnlyCoreApps || mParseError != PackageManager.INSTALL_SUCCEEDED) {
if (errorException != null) {
Slog.w(TAG, mArchiveSourcePath, errorException);
} else {
Slog.w(TAG, mArchiveSourcePath + (at
+ parser.getPositionDescription()
+ ): + errorText[0]);
}
if (mParseError == PackageManager.INSTALL_SUCCEEDED) {
mParseError = PackageManager.INSTALL_PARSE_FAILED_MANIFEST_MALFORMED;
}
}
parser.close();
assmgr.close();
return null;
}
parser.close();
assmgr.close();
// Set code and resource paths
pkg.mPath = destCodePath;
pkg.mScanPath = mArchiveSourcePath;
//pkg.applicationInfo.sourceDir = destCodePath;
//pkg.applicationInfo.publicSourceDir = destRes;
pkg.mSignatures = null;
return pkg;
}
XmlResourceParser parser = null;
AssetManager assmgr = null;
Resources res = null;
assmgr = new AssetManager();
int cookie = assmgr.addAssetPath(mArchiveSourcePath);
res = new Resources(assmgr, metrics, null);當然Resources信息也是通過AssetManager獲取到的。XmlResourceParser顧名思義就是Xml資源文件解析器了，用來解析我們xml文件的
parser = assmgr.openXmlResourceParser(cookie, ANDROID_MANIFEST_FILENAME);
private static final String ANDROID_MANIFEST_FILENAME = AndroidManifest.xml;
String[] errorText = new String[1];
Package pkg = null;
Exception errorException = null;
try {
// XXXX todo: need to figure out correct configuration.
pkg = parsePackage(res, parser, flags, errorText);
} catch (Exception e) {
errorException = e;
mParseError = PackageManager.INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION;
}
String pkgName = parsePackageName(parser, attrs, flags, outError);
final Package pkg = new Package(pkgName);
boolean foundApp = false;
TypedArray sa = res.obtainAttributes(attrs,
com.android.internal.R.styleable.AndroidManifest);
pkg.mVersionCode = sa.getInteger(
com.android.internal.R.styleable.AndroidManifest_versionCode, 0);
pkg.mVersionName = sa.getNonConfigurationString(
com.android.internal.R.styleable.AndroidManifest_versionName, 0);
if (pkg.mVersionName != null) {
pkg.mVersionName = pkg.mVersionName.intern();
}
String str = sa.getNonConfigurationString(
com.android.internal.R.styleable.AndroidManifest_sharedUserId, 0);
if (str != null && str.length() > 0) {
String nameError = validateName(str, true);
if (nameError != null && !android.equals(pkgName)) {
outError[0] = specifies bad sharedUserId name
+ str + : + nameError;
mParseError = PackageManager.INSTALL_PARSE_FAILED_BAD_SHARED_USER_ID;
return null;
}
pkg.mSharedUserId = str.intern();
pkg.mSharedUserLabel = sa.getResourceId(
com.android.internal.R.styleable.AndroidManifest_sharedUserLabel, 0);
}
sa.recycle();
pkg.installLocation = sa.getInteger(
com.android.internal.R.styleable.AndroidManifest_installLocation,
PARSE_DEFAULT_INSTALL_LOCATION);
pkg.applicationInfo.installLocation = pkg.installLocation;
這裡面包含的信息，例如這裡的lable等等，還有以其為父的activity，receiver，service，provider等等，這裡以activity為例，還是去frameworks/base/core/res/res/values下的attrs_manifest.xml中，也就是
這類，大家經常會見到的；還有permission-group，uses-sdk等等吧，有興趣的可以一一研究。最終這些信息都會囊括到我們的Package中。這裡我們明白Package是什麼了吧？就是包含包中所有信息的的玩意。到此位置我們的Package已經生成，然後我們還回到PackageInstallerActivity的onCreate中，接著往下看，不重要的就跳過了
initiateInstall()
也就是
private void initiateInstall() {
String pkgName = mPkgInfo.packageName;
// Check if there is already a package on the device with this name
// but it has been renamed to something else.
String[] oldName = mPm.canonicalToCurrentPackageNames(new String[] { pkgName });
if (oldName != null && oldName.length > 0 && oldName[0] != null) {
pkgName = oldName[0];
mPkgInfo.setPackageName(pkgName);
}
// Check if package is already installed. display confirmation dialog if replacing pkg
try {
mAppInfo = mPm.getApplicationInfo(pkgName,
PackageManager.GET_UNINSTALLED_PACKAGES);
} catch (NameNotFoundException e) {
mAppInfo = null;
}
if (mAppInfo == null || getIntent().getBooleanExtra(Intent.EXTRA_ALLOW_REPLACE, false)) {
startInstallConfirm();
} else {
if(localLOGV) Log.i(TAG, Replacing existing package:+
mPkgInfo.applicationInfo.packageName);
showDialogInner(DLG_REPLACE_APP);
}
}
private void startInstallConfirm() {
LinearLayout permsSection = (LinearLayout) mInstallConfirm.findViewById(R.id.permissions_section);
LinearLayout securityList = (LinearLayout) permsSection.findViewById(
R.id.security_settings_list);
boolean permVisible = false;
if(mPkgInfo != null) {
AppSecurityPermissions asp = new AppSecurityPermissions(this, mPkgInfo);
if(asp.getPermissionCount() > 0) {
permVisible = true;
securityList.addView(asp.getPermissionsView());
}
}
if(!permVisible){
permsSection.setVisibility(View.INVISIBLE);
}
mInstallConfirm.setVisibility(View.VISIBLE);
mOk = (Button)findViewById(R.id.ok_button);
mCancel = (Button)findViewById(R.id.cancel_button);
mOk.setOnClickListener(this);
mCancel.setOnClickListener(this);
}
public AppSecurityPermissions(Context context, PackageParser.Package pkg) {
mContext = context;
mPm = mContext.getPackageManager();
mPermsList = new ArrayList();
Set permSet = new HashSet();
if(pkg == null) {
return;
}
// Get requested permissions
if (pkg.requestedPermissions != null) {
ArrayList strList = pkg.requestedPermissions;
int size = strList.size();
if (size > 0) {
extractPerms(strList.toArray(new String[size]), permSet);
}
}
// Get permissions related to shared user if any
if(pkg.mSharedUserId != null) {
int sharedUid;
try {
sharedUid = mPm.getUidForSharedUser(pkg.mSharedUserId);
getAllUsedPermissions(sharedUid, permSet);
} catch (NameNotFoundException e) {
Log.w(TAG, Could'nt retrieve shared user id for:+pkg.packageName);
}
}
// Retrieve list of permissions
for(PermissionInfo tmpInfo : permSet) {
mPermsList.add(tmpInfo);
}
}
public View getPermissionsView() {
mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mPermsView = (LinearLayout) mInflater.inflate(R.layout.app_perms_summary, null);
mShowMore = mPermsView.findViewById(R.id.show_more);
mShowMoreIcon = (ImageView) mShowMore.findViewById(R.id.show_more_icon);
mShowMoreText = (TextView) mShowMore.findViewById(R.id.show_more_text);
mDangerousList = (LinearLayout) mPermsView.findViewById(R.id.dangerous_perms_list);
mNonDangerousList = (LinearLayout) mPermsView.findViewById(R.id.non_dangerous_perms_list);
mNoPermsView = mPermsView.findViewById(R.id.no_permissions);
// Set up the LinearLayout that acts like a list item.
mShowMore.setClickable(true);
mShowMore.setOnClickListener(this);
mShowMore.setFocusable(true);
// Pick up from framework resources instead.
mDefaultGrpLabel = mContext.getString(R.string.default_permission_group);
mPermFormat = mContext.getString(R.string.permissions_format);
mNormalIcon = mContext.getResources().getDrawable(R.drawable.ic_text_dot);
mDangerousIcon = mContext.getResources().getDrawable(R.drawable.ic_bullet_key_permission);
mShowMaxIcon = mContext.getResources().getDrawable(R.drawable.expander_close_holo_dark);
mShowMinIcon = mContext.getResources().getDrawable(R.drawable.expander_open_holo_dark);
// Set permissions view
setPermissions(mPermsList);
return mPermsView;
}
private void setPermissions(List permList) {
mGroupLabelCache = new HashMap();
//add the default label so that uncategorized permissions can go here
mGroupLabelCache.put(mDefaultGrpName, mDefaultGrpLabel);
// Map containing group names and a list of permissions under that group
// categorized as dangerous
mDangerousMap = new HashMap();
// Map containing group names and a list of permissions under that group
// categorized as normal
mNormalMap = new HashMap();
// Additional structures needed to ensure that permissions are unique under
// each group
Map> dangerousMap =
new HashMap>();
Map > normalMap =
new HashMap>();
PermissionInfoComparator permComparator = new PermissionInfoComparator(mPm);
if (permList != null) {
// First pass to group permissions
for (PermissionInfo pInfo : permList) {
if(localLOGV) Log.i(TAG, Processing permission:+pInfo.name);
if(!isDisplayablePermission(pInfo)) {
if(localLOGV) Log.i(TAG, Permission:+pInfo.name+ is not displayable);
continue;
}
Map > permInfoMap =
(pInfo.protectionLevel == PermissionInfo.PROTECTION_DANGEROUS) ?
dangerousMap : normalMap;
String grpName = (pInfo.group == null) ? mDefaultGrpName : pInfo.group;
if(localLOGV) Log.i(TAG, Permission:+pInfo.name+ belongs to group:+grpName);
List grpPermsList = permInfoMap.get(grpName);
if(grpPermsList == null) {
grpPermsList = new ArrayList();
permInfoMap.put(grpName, grpPermsList);
grpPermsList.add(pInfo);
} else {
int idx = Collections.binarySearch(grpPermsList, pInfo, permComparator);
if(localLOGV) Log.i(TAG, idx=+idx+, list.size=+grpPermsList.size());
if (idx < 0) {
idx = -idx-1;
grpPermsList.add(idx, pInfo);
}
}
}
// Second pass to actually form the descriptions
// Look at dangerous permissions first
aggregateGroupDescs(dangerousMap, mDangerousMap);
aggregateGroupDescs(normalMap, mNormalMap);
}
mCurrentState = State.NO_PERMS;
if(mDangerousMap.size() > 0) {
mCurrentState = (mNormalMap.size() > 0) ? State.BOTH : State.DANGEROUS_ONLY;
} else if(mNormalMap.size() > 0) {
mCurrentState = State.NORMAL_ONLY;
}
if(localLOGV) Log.i(TAG, mCurrentState= + mCurrentState);
showPermissions();
}
private void showPermissions() {
switch(mCurrentState) {
case NO_PERMS:
displayNoPermissions();
break;
case DANGEROUS_ONLY:
displayPermissions(true);
break;
case NORMAL_ONLY:
displayPermissions(false);
break;
case BOTH:
displayPermissions(true);
if (mExpanded) {
displayPermissions(false);
mShowMoreIcon.setImageDrawable(mShowMaxIcon);
mShowMoreText.setText(R.string.perms_hide);
mNonDangerousList.setVisibility(View.VISIBLE);
} else {
mShowMoreIcon.setImageDrawable(mShowMinIcon);
mShowMoreText.setText(R.string.perms_show_all);
mNonDangerousList.setVisibility(View.GONE);
}
mShowMore.setVisibility(View.VISIBLE);
break;
}
}
private void displayPermissions(boolean dangerous) {
Map permInfoMap = dangerous ? mDangerousMap : mNormalMap;
LinearLayout permListView = dangerous ? mDangerousList : mNonDangerousList;
permListView.removeAllViews();
Set permInfoStrSet = permInfoMap.keySet();
for (String loopPermGrpInfoStr : permInfoStrSet) {
CharSequence grpLabel = getGroupLabel(loopPermGrpInfoStr);
//guaranteed that grpLabel wont be null since permissions without groups
//will belong to the default group
if(localLOGV) Log.i(TAG, Adding view group: + grpLabel + , desc:
+ permInfoMap.get(loopPermGrpInfoStr));
permListView.addView(getPermissionItemView(grpLabel,
permInfoMap.get(loopPermGrpInfoStr), dangerous));
}
}
接下來，我們說說當點擊“安裝”之後做了什麼事情。
public void onClick(View v) {
if(v == mOk) {
// 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, InstallAppProgress.class);
String installerPackageName = getIntent().getStringExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME);
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(localLOGV) Log.i(TAG, downloaded app uri=+mPackageURI);
startActivity(newIntent);
finish();
} else if(v == mCancel) {
// Cancel and finish
setResult(RESULT_CANCELED);
finish();
}
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
Intent intent = getIntent();
mAppInfo = intent.getParcelableExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO);
mPackageURI = intent.getData();
initView();
}
String installerPackageName = getIntent().getStringExtra(
Intent.EXTRA_INSTALLER_PACKAGE_NAME);
PackageInstallObserver observer = new PackageInstallObserver();
pm.installPackage(mPackageURI, observer, installFlags, installerPackageName);
class PackageInstallObserver extends IPackageInstallObserver.Stub {
public void packageInstalled(String packageName, int returnCode) {
Message msg = mHandler.obtainMessage(INSTALL_COMPLETE);
Log.d(packageInstalled, returnCode = +returnCode);
msg.arg1 = returnCode;
mHandler.sendMessage(msg);
}
}
/* Called when a downloaded package installation has been confirmed by the user */
public void installPackage(
final Uri packageURI, final IPackageInstallObserver observer, final int flags) {
installPackage(packageURI, observer, flags, null);
}
/* Called when a downloaded package installation has been confirmed by the user */
public void installPackage(
final Uri packageURI, final IPackageInstallObserver observer, final int flags,
final String installerPackageName) {
installPackageWithVerification(packageURI, observer, flags, installerPackageName, null,
null);
}
public void installPackageWithVerification(Uri packageURI, IPackageInstallObserver observer,
int flags, String installerPackageName, Uri verificationURI,
ManifestDigest manifestDigest) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.INSTALL_PACKAGES, null);
final int uid = Binder.getCallingUid();
final int filteredFlags;
if (uid == Process.SHELL_UID || uid == 0) {
if (DEBUG_INSTALL) {
Slog.v(TAG, Install from ADB);
}
filteredFlags = flags | PackageManager.INSTALL_FROM_ADB;
} else {
filteredFlags = flags & ~PackageManager.INSTALL_FROM_ADB;
}
final Message msg = mHandler.obtainMessage(INIT_COPY);
msg.obj = new InstallParams(packageURI, observer, filteredFlags, installerPackageName,
verificationURI, manifestDigest);
mHandler.sendMessage(msg);
}
case INIT_COPY: {
if (DEBUG_INSTALL) Slog.i(TAG, init_copy);
HandlerParams params = (HandlerParams) msg.obj;
int idx = mPendingInstalls.size();
if (DEBUG_INSTALL) Slog.i(TAG, idx= + idx);
// If a bind was already initiated we dont really
// need to do anything. The pending install
// will be processed later on.
if (!mBound) {
// If this is the only one pending we might
// have to bind to the service again.
if (!connectToService()) {
Slog.e(TAG, Failed to bind to media container service);
params.serviceError();
return;
} else {
// Once we bind to the service, the first
// pending request will be processed.
mPendingInstalls.add(idx, params);
}
} else {
mPendingInstalls.add(idx, params);
// Already bound to the service. Just make
// sure we trigger off processing the first request.
if (idx == 0) {
mHandler.sendEmptyMessage(MCS_BOUND);
}
}
break;
}
case MCS_BOUND: {
if (DEBUG_INSTALL) Slog.i(TAG, mcs_bound);
if (msg.obj != null) {
mContainerService = (IMediaContainerService) msg.obj;
}
if (mContainerService == null) {
// Something seriously wrong. Bail out
Slog.e(TAG, Cannot bind to media container service);
for (HandlerParams params : mPendingInstalls) {
mPendingInstalls.remove(0);
// Indicate service bind error
params.serviceError();
}
mPendingInstalls.clear();
} else if (mPendingInstalls.size() > 0) {
HandlerParams params = mPendingInstalls.get(0);
if (params != null) {
if (params.startCopy()) {
// We are done... look for more work or to
// go idle.
if (DEBUG_SD_INSTALL) Log.i(TAG,
Checking for more work or unbind...);
// Delete pending install
if (mPendingInstalls.size() > 0) {
mPendingInstalls.remove(0);
}
if (mPendingInstalls.size() == 0) {
if (mBound) {
if (DEBUG_SD_INSTALL) Log.i(TAG,
Posting delayed MCS_UNBIND);
removeMessages(MCS_UNBIND);
Message ubmsg = obtainMessage(MCS_UNBIND);
// Unbind after a little delay, to avoid
// continual thrashing.
sendMessageDelayed(ubmsg, 10000);
}
} else {
// There are more pending requests in queue.
// Just post MCS_BOUND message to trigger processing
// of next pending install.
if (DEBUG_SD_INSTALL) Log.i(TAG,
Posting MCS_BOUND for next woek);
mHandler.sendEmptyMessage(MCS_BOUND);
}
}
}
} else {
// Should never happen ideally.
Slog.w(TAG, Empty queue);
}
break;
}
params.startCopy()
這個了，進去看看
final boolean startCopy() {
boolean res;
try {
if (DEBUG_INSTALL) Slog.i(TAG, startCopy);
if (++mRetries > MAX_RETRIES) {
Slog.w(TAG, Failed to invoke remote methods on default container service. Giving up);
mHandler.sendEmptyMessage(MCS_GIVE_UP);
handleServiceError();
return false;
} else {
handleStartCopy();
res = true;
}
} catch (RemoteException e) {
if (DEBUG_INSTALL) Slog.i(TAG, Posting install MCS_RECONNECT);
mHandler.sendEmptyMessage(MCS_RECONNECT);
res = false;
}
handleReturnCode();
return res;
}
這裡的handleStartCopy()和handleServiceError()和handleReturnCode()都是abstract函數，希望大家還記得剛才我們發消息的時候攜帶的是InstallParams個類，InstallParams繼承於HandlerParams，所以我們就會知道這三個abstract是在哪裡實現的了，我們先說說handleStartCopy()，主要給兩個變量完成了賦值工作也個是mArgs也就是InstallArgs，一個是ret標識是否安裝成功的。handleServiceError()這個不講解，然後看handleReturnCode()
@Override
void handleReturnCode() {
// If mArgs is null, then MCS couldn't be reached. When it
// reconnects, it will try again to install. At that point, this
// will succeed.
if (mArgs != null) {
processPendingInstall(mArgs, mRet);
}
}
private void processPendingInstall(final InstallArgs args, final int currentStatus) {
// Queue up an async operation since the package installation may take a little while.
mHandler.post(new Runnable() {
public void run() {
mHandler.removeCallbacks(this);
// Result object to be returned
PackageInstalledInfo res = new PackageInstalledInfo();
res.returnCode = currentStatus;
res.uid = -1;
res.pkg = null;
res.removedInfo = new PackageRemovedInfo();
if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {
args.doPreInstall(res.returnCode);
synchronized (mInstallLock) {
installPackageLI(args, true, res);
}
args.doPostInstall(res.returnCode);
}
// A restore should be performed at this point if (a) the install
// succeeded, (b) the operation is not an update, and (c) the new
// package has a backupAgent defined.
final boolean update = res.removedInfo.removedPackage != null;
boolean doRestore = (!update
&& res.pkg != null
&& res.pkg.applicationInfo.backupAgentName != null);
// Set up the post-install work request bookkeeping. This will be used
// and cleaned up by the post-install event handling regardless of whether
// there's a restore pass performed. Token values are >= 1.
int token;
if (mNextInstallToken < 0) mNextInstallToken = 1;
token = mNextInstallToken++;
PostInstallData data = new PostInstallData(args, res);
mRunningInstalls.put(token, data);
if (DEBUG_INSTALL) Log.v(TAG, + starting restore round-trip + token);
if (res.returnCode == PackageManager.INSTALL_SUCCEEDED && doRestore) {
// Pass responsibility to the Backup Manager. It will perform a
// restore if appropriate, then pass responsibility back to the
// Package Manager to run the post-install observer callbacks
// and broadcasts.
IBackupManager bm = IBackupManager.Stub.asInterface(
ServiceManager.getService(Context.BACKUP_SERVICE));
if (bm != null) {
if (DEBUG_INSTALL) Log.v(TAG, token + token
+ to BM for possible restore);
try {
bm.restoreAtInstall(res.pkg.applicationInfo.packageName, token);
} catch (RemoteException e) {
// can't happen; the backup manager is local
} catch (Exception e) {
Slog.e(TAG, Exception trying to enqueue restore, e);
doRestore = false;
}
} else {
Slog.e(TAG, Backup Manager not found!);
doRestore = false;
}
}
if (!doRestore) {
// No restore possible, or the Backup Manager was mysteriously not
// available -- just fire the post-install work request directly.
if (DEBUG_INSTALL) Log.v(TAG, No restore - queue post-install for + token);
Message msg = mHandler.obtainMessage(POST_INSTALL, token, 0);
mHandler.sendMessage(msg);
}
}
});
}
PackageInstalledInfo res = new PackageInstalledInfo();
res.returnCode = currentStatus;
res.uid = -1;
res.pkg = null;
res.removedInfo = new PackageRemovedInfo();
if (res.returnCode == PackageManager.INSTALL_SUCCEEDED) {
args.doPreInstall(res.returnCode);
synchronized (mInstallLock) {
installPackageLI(args, true, res);
}
args.doPostInstall(res.returnCode);
}
if (replace) {
replacePackageLI(pkg, parseFlags, scanMode,
installerPackageName, res);
} else {
installNewPackageLI(pkg, parseFlags, scanMode,
installerPackageName,res);
}
/*
* Install a non-existing package.
*/
private void installNewPackageLI(PackageParser.Package pkg,
int parseFlags,
int scanMode,
String installerPackageName, PackageInstalledInfo res) {
// Remember this for later, in case we need to rollback this install
String pkgName = pkg.packageName;
boolean dataDirExists = getDataPathForPackage(pkg.packageName, 0).exists();
res.name = pkgName;
synchronized(mPackages) {
if (mSettings.mRenamedPackages.containsKey(pkgName)) {
// A package with the same name is already installed, though
// it has been renamed to an older name. The package we
// are trying to install should be installed as an update to
// the existing one, but that has not been requested, so bail.
Slog.w(TAG, Attempt to re-install + pkgName
+ without first uninstalling package running as
+ mSettings.mRenamedPackages.get(pkgName));
res.returnCode = PackageManager.INSTALL_FAILED_ALREADY_EXISTS;
return;
}
if (mPackages.containsKey(pkgName) || mAppDirs.containsKey(pkg.mPath)) {
// Don't allow installation over an existing package with the same name.
Slog.w(TAG, Attempt to re-install + pkgName
+ without first uninstalling.);
res.returnCode = PackageManager.INSTALL_FAILED_ALREADY_EXISTS;
return;
}
}
mLastScanError = PackageManager.INSTALL_SUCCEEDED;
PackageParser.Package newPackage = scanPackageLI(pkg, parseFlags, scanMode,
System.currentTimeMillis());
if (newPackage == null) {
Slog.w(TAG, Package couldn't be installed in + pkg.mPath);
if ((res.returnCode=mLastScanError) == PackageManager.INSTALL_SUCCEEDED) {
res.returnCode = PackageManager.INSTALL_FAILED_INVALID_APK;
}
} else {
updateSettingsLI(newPackage,
installerPackageName,
res);
// delete the partially installed application. the data directory will have to be
// restored if it was already existing
if (res.returnCode != PackageManager.INSTALL_SUCCEEDED) {
// remove package from internal structures. Note that we want deletePackageX to
// delete the package data and cache directories that it created in
// scanPackageLocked, unless those directories existed before we even tried to
// install.
deletePackageLI(
pkgName, false,
dataDirExists ? PackageManager.DONT_DELETE_DATA : 0,
res.removedInfo, true);
}
}
}
PackageParser.Package newPackage = scanPackageLI(pkg, parseFlags, scanMode,
System.currentTimeMillis());
int ret = mInstaller.install(pkgName, pkg.applicationInfo.uid,
pkg.applicationInfo.uid);
public int install(String name, int uid, int gid) {
StringBuilder builder = new StringBuilder(install);
builder.append(' ');
builder.append(name);
builder.append(' ');
builder.append(uid);
builder.append(' ');
builder.append(gid);
return execute(builder.toString());
}
private int execute(String cmd) {
String res = transaction(cmd);
try {
return Integer.parseInt(res);
} catch (NumberFormatException ex) {
return -1;
}
}
private synchronized String transaction(String cmd) {
if (!connect()) {
Slog.e(TAG, connection failed);
return -1;
}
if (!writeCommand(cmd)) {
/*
* If installd died and restarted in the background (unlikely but
* possible) we'll fail on the next write (this one). Try to
* reconnect and write the command one more time before giving up.
*/
Slog.e(TAG, write command failed? reconnect!);
if (!connect() || !writeCommand(cmd)) {
return -1;
}
}
if (LOCAL_DEBUG) {
Slog.i(TAG, send: ' + cmd + ');
}
if (readReply()) {
String s = new String(buf, 0, buflen);
if (LOCAL_DEBUG) {
Slog.i(TAG, recv: ' + s + ');
}
return s;
} else {
if (LOCAL_DEBUG) {
Slog.i(TAG, fail);
}
return -1;
}
}
private boolean writeCommand(String _cmd) {
byte[] cmd = _cmd.getBytes();
int len = cmd.length;
if ((len < 1) || (len > 1024))
return false;
buf[0] = (byte) (len & 0xff);
buf[1] = (byte) ((len >> 8) & 0xff);
try {
mOut.write(buf, 0, 2);
mOut.write(cmd, 0, len);
} catch (IOException ex) {
Slog.e(TAG, write error);
disconnect();
return false;
}
return true;
}
private boolean connect() {
if (mSocket != null) {
return true;
}
Slog.i(TAG, connecting...);
try {
mSocket = new LocalSocket();
LocalSocketAddress address = new LocalSocketAddress(installd,
LocalSocketAddress.Namespace.RESERVED);
mSocket.connect(address);
mIn = mSocket.getInputStream();
mOut = mSocket.getOutputStream();
} catch (IOException ex) {
disconnect();
return false;
}
return true;
}
還是那句話給大師取樂，給後來者拋磚引玉，不要在背後罵我就謝天謝地了。
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版本：1.0 日期：2014.8.9 2014.9.24版權：© 2014 kince 轉載注明出處 波形效果有幾種不同的呈現形式，比如從中間向四周散開的波形，
