packages/DefaultContainerService/src/com/android/defcontainer/DefaultContainerService.java - platform/frameworks/base - Git at Google

 package com.android.defcontainer;

 import com.android.internal.app.IMediaContainerService;
 import com.android.internal.content.PackageHelper;
 import android.content.Intent;
 import android.content.pm.IPackageManager;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageInfoLite;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageParser;
 import android.content.pm.PackageParser.Package;
 import android.net.Uri;
 import android.os.Environment;
 import android.os.IBinder;
 import android.os.ParcelFileDescriptor;
 import android.os.Process;
 import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.os.StatFs;
 import android.app.IntentService;
 import android.util.DisplayMetrics;
 import android.util.Log;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;

 import android.os.FileUtils;
 import android.os.storage.IMountService;
 import android.provider.Settings;

 /*
  * This service copies a downloaded apk to a file passed in as
  * a ParcelFileDescriptor or to a newly created container specified
  * by parameters. The DownloadManager gives access to this process
  * based on its uid. This process also needs the ACCESS_DOWNLOAD_MANAGER
  * permission to access apks downloaded via the download manager.
  */
 public class DefaultContainerService extends IntentService {
     private static final String TAG = "DefContainer";
     private static final boolean localLOGV = true;

     private IMediaContainerService.Stub mBinder = new IMediaContainerService.Stub() {
         /*
          * Creates a new container and copies resource there.
          * @param paackageURI the uri of resource to be copied. Can be either
          * a content uri or a file uri
          * @param cid the id of the secure container that should
          * be used for creating a secure container into which the resource
          * will be copied.
          * @param key Refers to key used for encrypting the secure container
          * @param resFileName Name of the target resource file(relative to newly
          * created secure container)
          * @return Returns the new cache path where the resource has been copied into
          *
          */
         public String copyResourceToContainer(final Uri packageURI,
                 final String cid,
                 final String key, final String resFileName) {
             if (packageURI == null || cid == null) {
                 return null;
             }
             return copyResourceInner(packageURI, cid, key, resFileName);
         }

         /*
          * Copy specified resource to output stream
          * @param packageURI the uri of resource to be copied. Should be a
          * file uri
          * @param outStream Remote file descriptor to be used for copying
          * @return Returns true if copy succeded or false otherwise.
          */
         public boolean copyResource(final Uri packageURI,
                 ParcelFileDescriptor outStream) {
             if (packageURI == null ||  outStream == null) {
                 return false;
             }
             ParcelFileDescriptor.AutoCloseOutputStream
             autoOut = new ParcelFileDescriptor.AutoCloseOutputStream(outStream);
             return copyFile(packageURI, autoOut);
         }

         /*
          * Determine the recommended install location for package
          * specified by file uri location.
          * @param fileUri the uri of resource to be copied. Should be a
          * file uri
          * @return Returns PackageInfoLite object containing
          * the package info and recommended app location.
          */
         public PackageInfoLite getMinimalPackageInfo(final Uri fileUri) {
             PackageInfoLite ret = new PackageInfoLite();
             if (fileUri == null) {
                 Log.i(TAG, "Invalid package uri " + fileUri);
                 ret.recommendedInstallLocation = PackageHelper.RECOMMEND_FAILED_INVALID_APK;
                 return ret;
             }
             String scheme = fileUri.getScheme();
             if (scheme != null && !scheme.equals("file")) {
                 Log.w(TAG, "Falling back to installing on internal storage only");
                 ret.recommendedInstallLocation = PackageHelper.RECOMMEND_INSTALL_INTERNAL;
                 return ret;
             }
             String archiveFilePath = fileUri.getPath();
             PackageParser packageParser = new PackageParser(archiveFilePath);
             File sourceFile = new File(archiveFilePath);
             DisplayMetrics metrics = new DisplayMetrics();
             metrics.setToDefaults();
             PackageParser.PackageLite pkg = packageParser.parsePackageLite(
                     archiveFilePath, 0);
             ret.packageName = pkg.packageName;
             ret.installLocation = pkg.installLocation;
             // Nuke the parser reference right away and force a gc
             Runtime.getRuntime().gc();
             packageParser = null;
             if (pkg == null) {
                 Log.w(TAG, "Failed to parse package");
                 ret.recommendedInstallLocation = PackageHelper.RECOMMEND_FAILED_INVALID_APK;
                 return ret;
             }
             ret.packageName = pkg.packageName;
             int loc = recommendAppInstallLocation(pkg.installLocation, archiveFilePath);
             if (loc == PackageManager.INSTALL_EXTERNAL) {
                 ret.recommendedInstallLocation =  PackageHelper.RECOMMEND_INSTALL_EXTERNAL;
             } else if (loc == ERR_LOC) {
                 Log.i(TAG, "Failed to install insufficient storage");
                 ret.recommendedInstallLocation =  PackageHelper.RECOMMEND_FAILED_INSUFFICIENT_STORAGE;
             } else {
                 // Implies install on internal storage.
                 ret.recommendedInstallLocation =  PackageHelper.RECOMMEND_INSTALL_INTERNAL;
             }
             return ret;
         }
     };

     public DefaultContainerService() {
         super("DefaultContainerService");
         setIntentRedelivery(true);
     }

     @Override
     protected void onHandleIntent(Intent intent) {
         if (PackageManager.ACTION_CLEAN_EXTERNAL_STORAGE.equals(intent.getAction())) {
             IPackageManager pm = IPackageManager.Stub.asInterface(
                     ServiceManager.getService("package"));
             String pkg = null;
             try {
                 while ((pkg=pm.nextPackageToClean(pkg)) != null) {
                     eraseFiles(Environment.getExternalStorageAppDataDirectory(pkg));
                     eraseFiles(Environment.getExternalStorageAppMediaDirectory(pkg));
                 }
             } catch (RemoteException e) {
             }
         }
     }

     void eraseFiles(File path) {
         if (path.isDirectory()) {
             String[] files = path.list();
             if (files != null) {
                 for (String file : files) {
                     eraseFiles(new File(path, file));
                 }
             }
         }
         path.delete();
     }

     public IBinder onBind(Intent intent) {
         return mBinder;
     }

     private String copyResourceInner(Uri packageURI, String newCid, String key, String resFileName) {
         // Create new container at newCachePath
         String codePath = packageURI.getPath();
         File codeFile = new File(codePath);
         String newCachePath = null;
         // Create new container
         if ((newCachePath = PackageHelper.createSdDir(codeFile,
                 newCid, key, Process.myUid())) == null) {
             Log.e(TAG, "Failed to create container " + newCid);
             return null;
         }
         if (localLOGV) Log.i(TAG, "Created container for " + newCid
                 + " at path : " + newCachePath);
         File resFile = new File(newCachePath, resFileName);
         if (!FileUtils.copyFile(new File(codePath), resFile)) {
             Log.e(TAG, "Failed to copy " + codePath + " to " + resFile);
             // Clean up container
             PackageHelper.destroySdDir(newCid);
             return null;
         }
         if (localLOGV) Log.i(TAG, "Copied " + codePath + " to " + resFile);
         if (!PackageHelper.finalizeSdDir(newCid)) {
             Log.e(TAG, "Failed to finalize " + newCid + " at path " + newCachePath);
             // Clean up container
             PackageHelper.destroySdDir(newCid);
         }
         if (localLOGV) Log.i(TAG, "Finalized container " + newCid);
         if (PackageHelper.isContainerMounted(newCid)) {
             if (localLOGV) Log.i(TAG, "Unmounting " + newCid +
                     " at path " + newCachePath);
             // Force a gc to avoid being killed.
             Runtime.getRuntime().gc();
             PackageHelper.unMountSdDir(newCid);
         } else {
             if (localLOGV) Log.i(TAG, "Container " + newCid + " not mounted");
         }
         return newCachePath;
     }

     public static boolean copyToFile(InputStream inputStream, FileOutputStream out) {
         try {
             byte[] buffer = new byte[4096];
             int bytesRead;
             while ((bytesRead = inputStream.read(buffer)) >= 0) {
                 out.write(buffer, 0, bytesRead);
             }
             return true;
         } catch (IOException e) {
             Log.i(TAG, "Exception : " + e + " when copying file");
             return false;
         }
     }

     public static boolean copyToFile(File srcFile, FileOutputStream out) {
         InputStream inputStream = null;
         try {
             inputStream = new FileInputStream(srcFile);
             return copyToFile(inputStream, out);
         } catch (IOException e) {
             return false;
         } finally {
             try { if (inputStream != null) inputStream.close(); } catch (IOException e) {}
         }
     }

     private  boolean copyFile(Uri pPackageURI, FileOutputStream outStream) {
         String scheme = pPackageURI.getScheme();
         if (scheme == null || scheme.equals("file")) {
             final File srcPackageFile = new File(pPackageURI.getPath());
             // We copy the source package file to a temp file and then rename it to the
             // destination file in order to eliminate a window where the package directory
             // scanner notices the new package file but it's not completely copied yet.
             if (!copyToFile(srcPackageFile, outStream)) {
                 Log.e(TAG, "Couldn't copy file: " + srcPackageFile);
                 return false;
             }
         } else if (scheme.equals("content")) {
             ParcelFileDescriptor fd = null;
             try {
                 fd = getContentResolver().openFileDescriptor(pPackageURI, "r");
             } catch (FileNotFoundException e) {
                 Log.e(TAG, "Couldn't open file descriptor from download service. Failed with exception " + e);
                 return false;
             }
             if (fd == null) {
                 Log.e(TAG, "Couldn't open file descriptor from download service (null).");
                 return false;
             } else {
                 if (localLOGV) {
                     Log.v(TAG, "Opened file descriptor from download service.");
                 }
                 ParcelFileDescriptor.AutoCloseInputStream
                 dlStream = new ParcelFileDescriptor.AutoCloseInputStream(fd);
                 // We copy the source package file to a temp file and then rename it to the
                 // destination file in order to eliminate a window where the package directory
                 // scanner notices the new package file but it's not completely copied yet.
                 if (!copyToFile(dlStream, outStream)) {
                     Log.e(TAG, "Couldn't copy " + pPackageURI + " to temp file.");
                     return false;
                 }
             }
         } else {
             Log.e(TAG, "Package URI is not 'file:' or 'content:' - " + pPackageURI);
             return false;
         }
         return true;
     }

     // Constants related to app heuristics
     // No-installation limit for internal flash: 10% or less space available
     private static final double LOW_NAND_FLASH_TRESHOLD = 0.1;

     // SD-to-internal app size threshold: currently set to 1 MB
     private static final long INSTALL_ON_SD_THRESHOLD = (1024 * 1024);
     private static final int ERR_LOC = -1;

     private int recommendAppInstallLocation(int installLocation,
             String archiveFilePath) {
         // Initial implementation:
         // Package size = code size + cache size + data size
         // If code size > 1 MB, install on SD card.
         // Else install on internal NAND flash, unless space on NAND is less than 10%
         String status = Environment.getExternalStorageState();
         long availSDSize = -1;
         if (status.equals(Environment.MEDIA_MOUNTED)) {
             StatFs sdStats = new StatFs(
                     Environment.getExternalStorageDirectory().getPath());
             availSDSize = (long)sdStats.getAvailableBlocks() *
                     (long)sdStats.getBlockSize();
         }
         StatFs internalStats = new StatFs(Environment.getDataDirectory().getPath());
         long totalInternalSize = (long)internalStats.getBlockCount() *
                 (long)internalStats.getBlockSize();
         long availInternalSize = (long)internalStats.getAvailableBlocks() *
                 (long)internalStats.getBlockSize();

         double pctNandFree = (double)availInternalSize / (double)totalInternalSize;

         File apkFile = new File(archiveFilePath);
         long pkgLen = apkFile.length();

         boolean auto = true;
         // To make final copy
         long reqInstallSize = pkgLen;
         // For dex files. Just ignore and fail when extracting. Max limit of 2Gig for now.
         long reqInternalSize = 0;
         boolean intThresholdOk = (pctNandFree >= LOW_NAND_FLASH_TRESHOLD);
         boolean intAvailOk = ((reqInstallSize + reqInternalSize) < availInternalSize);
         boolean fitsOnSd = (reqInstallSize < availSDSize) && intThresholdOk &&
                 (reqInternalSize < availInternalSize);
         boolean fitsOnInt = intThresholdOk && intAvailOk;

         // Consider application flags preferences as well...
         boolean installOnlyOnSd = (installLocation ==
                 PackageInfo.INSTALL_LOCATION_PREFER_EXTERNAL);
         boolean installOnlyInternal = (installLocation ==
                 PackageInfo.INSTALL_LOCATION_INTERNAL_ONLY);
         if (installOnlyInternal) {
             // If set explicitly in manifest,
             // let that override everything else
             auto = false;
         } else if (installOnlyOnSd){
             // Check if this can be accommodated on the sdcard
             if (fitsOnSd) {
                 auto = false;
             }
         } else {
             // Check if user option is enabled
             boolean setInstallLoc = Settings.System.getInt(getApplicationContext()
                     .getContentResolver(),
                     Settings.System.SET_INSTALL_LOCATION, 0) != 0;
             if (setInstallLoc) {
                 // Pick user preference
                 int installPreference = Settings.System.getInt(getApplicationContext()
                         .getContentResolver(),
                         Settings.System.DEFAULT_INSTALL_LOCATION,
                         PackageHelper.APP_INSTALL_AUTO);
                 if (installPreference == PackageHelper.APP_INSTALL_INTERNAL) {
                     installOnlyInternal = true;
                     auto = false;
                 } else if (installPreference == PackageHelper.APP_INSTALL_EXTERNAL) {
                     installOnlyOnSd = true;
                     auto = false;
                 }
             }
         }
         if (!auto) {
             if (installOnlyOnSd) {
                 return fitsOnSd ? PackageManager.INSTALL_EXTERNAL : ERR_LOC;
             } else if (installOnlyInternal){
                 // Check on internal flash
                 return fitsOnInt ? 0 : ERR_LOC;
             }
         }
         // Try to install internally
         if (fitsOnInt) {
             return 0;
         }
         // Try the sdcard now.
         if (fitsOnSd) {
             return PackageManager.INSTALL_EXTERNAL;
         }
         // Return error code
         return ERR_LOC;
     }
 }
	package com.android.defcontainer;

	import com.android.internal.app.IMediaContainerService;
	import com.android.internal.content.PackageHelper;
	import android.content.Intent;
	import android.content.pm.IPackageManager;
	import android.content.pm.PackageInfo;
	import android.content.pm.PackageInfoLite;
	import android.content.pm.PackageManager;
	import android.content.pm.PackageParser;
	import android.content.pm.PackageParser.Package;
	import android.net.Uri;
	import android.os.Environment;
	import android.os.IBinder;
	import android.os.ParcelFileDescriptor;
	import android.os.Process;
	import android.os.RemoteException;
	import android.os.ServiceManager;
	import android.os.StatFs;
	import android.app.IntentService;
	import android.util.DisplayMetrics;
	import android.util.Log;

	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileNotFoundException;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStream;

	import android.os.FileUtils;
	import android.os.storage.IMountService;
	import android.provider.Settings;

	/*
	* This service copies a downloaded apk to a file passed in as
	* a ParcelFileDescriptor or to a newly created container specified
	* by parameters. The DownloadManager gives access to this process
	* based on its uid. This process also needs the ACCESS_DOWNLOAD_MANAGER
	* permission to access apks downloaded via the download manager.
	*/
	public class DefaultContainerService extends IntentService {
	private static final String TAG = "DefContainer";
	private static final boolean localLOGV = true;

	private IMediaContainerService.Stub mBinder = new IMediaContainerService.Stub() {
	/*
	* Creates a new container and copies resource there.
	* @param paackageURI the uri of resource to be copied. Can be either
	* a content uri or a file uri
	* @param cid the id of the secure container that should
	* be used for creating a secure container into which the resource
	* will be copied.
	* @param key Refers to key used for encrypting the secure container
	* @param resFileName Name of the target resource file(relative to newly
	* created secure container)
	* @return Returns the new cache path where the resource has been copied into
	*
	*/
	public String copyResourceToContainer(final Uri packageURI,
	final String cid,
	final String key, final String resFileName) {
	if (packageURI == null \|\| cid == null) {
	return null;
	}
	return copyResourceInner(packageURI, cid, key, resFileName);
	}

	/*
	* Copy specified resource to output stream
	* @param packageURI the uri of resource to be copied. Should be a
	* file uri
	* @param outStream Remote file descriptor to be used for copying
	* @return Returns true if copy succeded or false otherwise.
	*/
	public boolean copyResource(final Uri packageURI,
	ParcelFileDescriptor outStream) {
	if (packageURI == null \|\| outStream == null) {
	return false;
	}
	ParcelFileDescriptor.AutoCloseOutputStream
	autoOut = new ParcelFileDescriptor.AutoCloseOutputStream(outStream);
	return copyFile(packageURI, autoOut);
	}

	/*
	* Determine the recommended install location for package
	* specified by file uri location.
	* @param fileUri the uri of resource to be copied. Should be a
	* file uri
	* @return Returns PackageInfoLite object containing
	* the package info and recommended app location.
	*/
	public PackageInfoLite getMinimalPackageInfo(final Uri fileUri) {
	PackageInfoLite ret = new PackageInfoLite();
	if (fileUri == null) {
	Log.i(TAG, "Invalid package uri " + fileUri);
	ret.recommendedInstallLocation = PackageHelper.RECOMMEND_FAILED_INVALID_APK;
	return ret;
	}
	String scheme = fileUri.getScheme();
	if (scheme != null && !scheme.equals("file")) {
	Log.w(TAG, "Falling back to installing on internal storage only");
	ret.recommendedInstallLocation = PackageHelper.RECOMMEND_INSTALL_INTERNAL;
	return ret;
	}
	String archiveFilePath = fileUri.getPath();
	PackageParser packageParser = new PackageParser(archiveFilePath);
	File sourceFile = new File(archiveFilePath);
	DisplayMetrics metrics = new DisplayMetrics();
	metrics.setToDefaults();
	PackageParser.PackageLite pkg = packageParser.parsePackageLite(
	archiveFilePath, 0);
	ret.packageName = pkg.packageName;
	ret.installLocation = pkg.installLocation;
	// Nuke the parser reference right away and force a gc
	Runtime.getRuntime().gc();
	packageParser = null;
	if (pkg == null) {
	Log.w(TAG, "Failed to parse package");
	ret.recommendedInstallLocation = PackageHelper.RECOMMEND_FAILED_INVALID_APK;
	return ret;
	}
	ret.packageName = pkg.packageName;
	int loc = recommendAppInstallLocation(pkg.installLocation, archiveFilePath);
	if (loc == PackageManager.INSTALL_EXTERNAL) {
	ret.recommendedInstallLocation = PackageHelper.RECOMMEND_INSTALL_EXTERNAL;
	} else if (loc == ERR_LOC) {
	Log.i(TAG, "Failed to install insufficient storage");
	ret.recommendedInstallLocation = PackageHelper.RECOMMEND_FAILED_INSUFFICIENT_STORAGE;
	} else {
	// Implies install on internal storage.
	ret.recommendedInstallLocation = PackageHelper.RECOMMEND_INSTALL_INTERNAL;
	}
	return ret;
	}
	};

	public DefaultContainerService() {
	super("DefaultContainerService");
	setIntentRedelivery(true);
	}

	@Override
	protected void onHandleIntent(Intent intent) {
	if (PackageManager.ACTION_CLEAN_EXTERNAL_STORAGE.equals(intent.getAction())) {
	IPackageManager pm = IPackageManager.Stub.asInterface(
	ServiceManager.getService("package"));
	String pkg = null;
	try {
	while ((pkg=pm.nextPackageToClean(pkg)) != null) {
	eraseFiles(Environment.getExternalStorageAppDataDirectory(pkg));
	eraseFiles(Environment.getExternalStorageAppMediaDirectory(pkg));
	}
	} catch (RemoteException e) {
	}
	}
	}

	void eraseFiles(File path) {
	if (path.isDirectory()) {
	String[] files = path.list();
	if (files != null) {
	for (String file : files) {
	eraseFiles(new File(path, file));
	}
	}
	}
	path.delete();
	}

	public IBinder onBind(Intent intent) {
	return mBinder;
	}

	private String copyResourceInner(Uri packageURI, String newCid, String key, String resFileName) {
	// Create new container at newCachePath
	String codePath = packageURI.getPath();
	File codeFile = new File(codePath);
	String newCachePath = null;
	// Create new container
	if ((newCachePath = PackageHelper.createSdDir(codeFile,
	newCid, key, Process.myUid())) == null) {
	Log.e(TAG, "Failed to create container " + newCid);
	return null;
	}
	if (localLOGV) Log.i(TAG, "Created container for " + newCid
	+ " at path : " + newCachePath);
	File resFile = new File(newCachePath, resFileName);
	if (!FileUtils.copyFile(new File(codePath), resFile)) {
	Log.e(TAG, "Failed to copy " + codePath + " to " + resFile);
	// Clean up container
	PackageHelper.destroySdDir(newCid);
	return null;
	}
	if (localLOGV) Log.i(TAG, "Copied " + codePath + " to " + resFile);
	if (!PackageHelper.finalizeSdDir(newCid)) {
	Log.e(TAG, "Failed to finalize " + newCid + " at path " + newCachePath);
	// Clean up container
	PackageHelper.destroySdDir(newCid);
	}
	if (localLOGV) Log.i(TAG, "Finalized container " + newCid);
	if (PackageHelper.isContainerMounted(newCid)) {
	if (localLOGV) Log.i(TAG, "Unmounting " + newCid +
	" at path " + newCachePath);
	// Force a gc to avoid being killed.
	Runtime.getRuntime().gc();
	PackageHelper.unMountSdDir(newCid);
	} else {
	if (localLOGV) Log.i(TAG, "Container " + newCid + " not mounted");
	}
	return newCachePath;
	}

	public static boolean copyToFile(InputStream inputStream, FileOutputStream out) {
	try {
	byte[] buffer = new byte[4096];
	int bytesRead;
	while ((bytesRead = inputStream.read(buffer)) >= 0) {
	out.write(buffer, 0, bytesRead);
	}
	return true;
	} catch (IOException e) {
	Log.i(TAG, "Exception : " + e + " when copying file");
	return false;
	}
	}

	public static boolean copyToFile(File srcFile, FileOutputStream out) {
	InputStream inputStream = null;
	try {
	inputStream = new FileInputStream(srcFile);
	return copyToFile(inputStream, out);
	} catch (IOException e) {
	return false;
	} finally {
	try { if (inputStream != null) inputStream.close(); } catch (IOException e) {}
	}
	}

	private boolean copyFile(Uri pPackageURI, FileOutputStream outStream) {
	String scheme = pPackageURI.getScheme();
	if (scheme == null \|\| scheme.equals("file")) {
	final File srcPackageFile = new File(pPackageURI.getPath());
	// We copy the source package file to a temp file and then rename it to the
	// destination file in order to eliminate a window where the package directory
	// scanner notices the new package file but it's not completely copied yet.
	if (!copyToFile(srcPackageFile, outStream)) {
	Log.e(TAG, "Couldn't copy file: " + srcPackageFile);
	return false;
	}
	} else if (scheme.equals("content")) {
	ParcelFileDescriptor fd = null;
	try {
	fd = getContentResolver().openFileDescriptor(pPackageURI, "r");
	} catch (FileNotFoundException e) {
	Log.e(TAG, "Couldn't open file descriptor from download service. Failed with exception " + e);
	return false;
	}
	if (fd == null) {
	Log.e(TAG, "Couldn't open file descriptor from download service (null).");
	return false;
	} else {
	if (localLOGV) {
	Log.v(TAG, "Opened file descriptor from download service.");
	}
	ParcelFileDescriptor.AutoCloseInputStream
	dlStream = new ParcelFileDescriptor.AutoCloseInputStream(fd);
	// We copy the source package file to a temp file and then rename it to the
	// destination file in order to eliminate a window where the package directory
	// scanner notices the new package file but it's not completely copied yet.
	if (!copyToFile(dlStream, outStream)) {
	Log.e(TAG, "Couldn't copy " + pPackageURI + " to temp file.");
	return false;
	}
	}
	} else {
	Log.e(TAG, "Package URI is not 'file:' or 'content:' - " + pPackageURI);
	return false;
	}
	return true;
	}

	// Constants related to app heuristics
	// No-installation limit for internal flash: 10% or less space available
	private static final double LOW_NAND_FLASH_TRESHOLD = 0.1;

	// SD-to-internal app size threshold: currently set to 1 MB
	private static final long INSTALL_ON_SD_THRESHOLD = (1024 * 1024);
	private static final int ERR_LOC = -1;

	private int recommendAppInstallLocation(int installLocation,
	String archiveFilePath) {
	// Initial implementation:
	// Package size = code size + cache size + data size
	// If code size > 1 MB, install on SD card.
	// Else install on internal NAND flash, unless space on NAND is less than 10%
	String status = Environment.getExternalStorageState();
	long availSDSize = -1;
	if (status.equals(Environment.MEDIA_MOUNTED)) {
	StatFs sdStats = new StatFs(
	Environment.getExternalStorageDirectory().getPath());
	availSDSize = (long)sdStats.getAvailableBlocks() *
	(long)sdStats.getBlockSize();
	}
	StatFs internalStats = new StatFs(Environment.getDataDirectory().getPath());
	long totalInternalSize = (long)internalStats.getBlockCount() *
	(long)internalStats.getBlockSize();
	long availInternalSize = (long)internalStats.getAvailableBlocks() *
	(long)internalStats.getBlockSize();

	double pctNandFree = (double)availInternalSize / (double)totalInternalSize;

	File apkFile = new File(archiveFilePath);
	long pkgLen = apkFile.length();

	boolean auto = true;
	// To make final copy
	long reqInstallSize = pkgLen;
	// For dex files. Just ignore and fail when extracting. Max limit of 2Gig for now.
	long reqInternalSize = 0;
	boolean intThresholdOk = (pctNandFree >= LOW_NAND_FLASH_TRESHOLD);
	boolean intAvailOk = ((reqInstallSize + reqInternalSize) < availInternalSize);
	boolean fitsOnSd = (reqInstallSize < availSDSize) && intThresholdOk &&
	(reqInternalSize < availInternalSize);
	boolean fitsOnInt = intThresholdOk && intAvailOk;

	// Consider application flags preferences as well...
	boolean installOnlyOnSd = (installLocation ==
	PackageInfo.INSTALL_LOCATION_PREFER_EXTERNAL);
	boolean installOnlyInternal = (installLocation ==
	PackageInfo.INSTALL_LOCATION_INTERNAL_ONLY);
	if (installOnlyInternal) {
	// If set explicitly in manifest,
	// let that override everything else
	auto = false;
	} else if (installOnlyOnSd){
	// Check if this can be accommodated on the sdcard
	if (fitsOnSd) {
	auto = false;
	}
	} else {
	// Check if user option is enabled
	boolean setInstallLoc = Settings.System.getInt(getApplicationContext()
	.getContentResolver(),
	Settings.System.SET_INSTALL_LOCATION, 0) != 0;
	if (setInstallLoc) {
	// Pick user preference
	int installPreference = Settings.System.getInt(getApplicationContext()
	.getContentResolver(),
	Settings.System.DEFAULT_INSTALL_LOCATION,
	PackageHelper.APP_INSTALL_AUTO);
	if (installPreference == PackageHelper.APP_INSTALL_INTERNAL) {
	installOnlyInternal = true;
	auto = false;
	} else if (installPreference == PackageHelper.APP_INSTALL_EXTERNAL) {
	installOnlyOnSd = true;
	auto = false;
	}
	}
	}
	if (!auto) {
	if (installOnlyOnSd) {
	return fitsOnSd ? PackageManager.INSTALL_EXTERNAL : ERR_LOC;
	} else if (installOnlyInternal){
	// Check on internal flash
	return fitsOnInt ? 0 : ERR_LOC;
	}
	}
	// Try to install internally
	if (fitsOnInt) {
	return 0;
	}
	// Try the sdcard now.
	if (fitsOnSd) {
	return PackageManager.INSTALL_EXTERNAL;
	}
	// Return error code
	return ERR_LOC;
	}
	}