I want to know the exact functionality of Intent.ACTION_PRE_BOOT_COMPLETED. Currently, my requirement is to complete the task before the completion of booting of the device, i.e. before the call of Intent.ACTION_BOOT_COMPLETED.
Can anyone guide me on how to proceed to fulfill the requirement? Any help in this regard will be well appreciated.
ACTION_PRE_BOOT_COMPLETED is sended in ActivityManagerService.java::systemReady.
But to received it, the uid of your application must be system(1000).
for (int i=ris.size()-1; i>=0; i--) {
if ((ris.get(i).activityInfo.applicationInfo.flags
&ApplicationInfo.FLAG_SYSTEM) == 0) {
ris.remove(i);
}
}
Further more, this broadcast could only be received once in each upgrade( not very sure here, maybe should be each wipe data).
Note code below, if the target is in lastDoneReceivers, it will be removed.
ArrayList<ComponentName> lastDoneReceivers = readLastDonePreBootReceivers();
final ArrayList<ComponentName> doneReceivers = new ArrayList<ComponentName>();
for (int i=0; i<ris.size(); i++) {
ActivityInfo ai = ris.get(i).activityInfo;
ComponentName comp = new ComponentName(ai.packageName, ai.name);
if (lastDoneReceivers.contains(comp)) {
ris.remove(i);
i--;
}
}
lastDoneReceivers is read from file /data/system/called_pre_boots.dat.
private static File getCalledPreBootReceiversFile() {
File dataDir = Environment.getDataDirectory();
File systemDir = new File(dataDir, "system");
File fname = new File(systemDir, "called_pre_boots.dat");
return fname;
}
static final int LAST_DONE_VERSION = 10000;
private static ArrayList<ComponentName> readLastDonePreBootReceivers() {
ArrayList<ComponentName> lastDoneReceivers = new ArrayList<ComponentName>();
File file = getCalledPreBootReceiversFile();
FileInputStream fis = null;
try {
fis = new FileInputStream(file);
DataInputStream dis = new DataInputStream(new BufferedInputStream(fis, 2048));
int fvers = dis.readInt();
if (fvers == LAST_DONE_VERSION) {
String vers = dis.readUTF();
String codename = dis.readUTF();
String build = dis.readUTF();
if (android.os.Build.VERSION.RELEASE.equals(vers)
&& android.os.Build.VERSION.CODENAME.equals(codename)
&& android.os.Build.VERSION.INCREMENTAL.equals(build)) {
int num = dis.readInt();
while (num > 0) {
num--;
String pkg = dis.readUTF();
String cls = dis.readUTF();
lastDoneReceivers.add(new ComponentName(pkg, cls));
}
}
}
} catch (FileNotFoundException e) {
} catch (IOException e) {
Slog.w(TAG, "Failure reading last done pre-boot receivers", e);
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
}
}
}
return lastDoneReceivers;
}
There is no such action as ACTION_PRE_BOOT_COMPLETED. I think that you normally can't fill your requirement. May be there is some mechanism for system signed apps to do that.
Related
i am creating an api that will recieve file from cordova file tranfer plugin.But while uploading , we are getting error "[10/19/2016 5:03:33 PM] azad singh: E/FileTransfer: {"target":"http://54.252.109.57:1031/api/Client/SaveDocument","http_status":500,"body":"\"Object reference not set to an instance of an object.\"","code":1,
[10/19/2016 5:03:45 PM] azad singh: Cordova - Camera"
[HttpPost]
[Route("Uploadfile")]
public string Uploadfile()
{
string msg = "";
try
{
HttpPostedFile file = HttpContext.Current.Request.Files["file"];
string saveFile = file.FileName;
//code to save the file
msg = "File uploaded";
}
catch (Exception ex)
{
msg = "Could not upload file: " + ex.Message;
}
return msg;
}
Please tell me where I am missing in my code...
This code works for me...
[HttpPost]
[Route("Uploadfile")]
public UploadFile Uploadfile()
{
HttpPostedFile file = HttpContext.Current.Request.Files["file"];
UploadFile uploadedfile = new UploadFile();
//HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Accepted);
try
{
if (file == null)
return uploadedfile ;
//response = Request.CreateResponse(HttpStatusCode.NotFound, "");
int count; int sum = 0;
byte[] buffer = new byte[file.ContentLength];
int length = (int)file.InputStream.Length;
buffer = new byte[length];
while ((count = file.InputStream.Read(buffer, sum, length - sum)) > 0)
sum += count;
FileVM fileObj = new FileVM();
NameValueCollection parameters = HttpContext.Current.Request.Params;
if (parameters.Keys.Count > 0)
{
fileObj.fileId = "";
fileObj.fileName = file.FileName.ToString();
fileObj.fileType = file.ContentType;
fileObj.filedata = "";
fileObj.LastDownLoad = parameters.GetValues("LastDownLoad")[0];
ServicecltClients srv = new ServicecltClients();
uploadedfile.FileId = srv.InsertDocumentAndRelatedClient(fileObj, buffer);
uploadedfile.FileType = fileObj.fileType;
//response = Request.CreateResponse<UploadFile>(HttpStatusCode.OK, uploadedfile);
}
}
catch (Exception _ex)
{
//response = Request.CreateResponse(HttpStatusCode.InternalServerError, _ex.Message);
ErrorLog.TraceErrorLog(_ex);
}
finally
{
file.InputStream.Close();
}
return uploadedfile;
}
I am trying to check whether device having external storage or not by using external storage path like this given below
if (new File("/ext_card/").exists()) {
specialPath = "/ext_card/";
} else if (new File("/mnt/sdcard/external_sd/").exists()) {
specialPath = "/mnt/sdcard/external_sd/";
} else if (new File("/storage/extSdCard/").exists()) {
specialPath = "/storage/extSdCard/";
} else if (new File("/mnt/extSdCard/").exists()) {
specialPath = "/mnt/extSdCard/";
} else if (new File("/mnt/sdcard/external_sd/").exists()) {
specialPath = "/mnt/sdcard/external_sd/";
} else if (new File("storage/sdcard1/").exists()) {
specialPath = "storage/sdcard1/";
}
But in marshmallow I con't find this path and while checking using ES FILEMANAGER, they give like storage/3263-3131 in Moto G 3rd generation. While check in other marshmallow devices that numbers getting differ. Please help me to check that marshmallow device have external storage or not? and if storage found means how to get the path of that external storage?
Note:- I gave permission for storage in my application and also enabled storage permission in settings for my app.
Thanks in advance and did you find any mistake in my question please crt it. thank you again.
Here's my solution, which is guaranteed to work till Android 7.0 Nougat:
/* returns external storage paths (directory of external memory card) as array of Strings */
public String[] getExternalStorageDirectories() {
List<String> results = new ArrayList<>();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { //Method 1 for KitKat & above
File[] externalDirs = getExternalFilesDirs(null);
String internalRoot = Environment.getExternalStorageDirectory().getAbsolutePath().toLowerCase();
for (File file : externalDirs) {
if(file==null) //solved NPE on some Lollipop devices
continue;
String path = file.getPath().split("/Android")[0];
if(path.toLowerCase().startsWith(internalRoot))
continue;
boolean addPath = false;
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
addPath = Environment.isExternalStorageRemovable(file);
}
else{
addPath = Environment.MEDIA_MOUNTED.equals(EnvironmentCompat.getStorageState(file));
}
if(addPath){
results.add(path);
}
}
}
if(results.isEmpty()) { //Method 2 for all versions
// better variation of: http://stackoverflow.com/a/40123073/5002496
String output = "";
try {
final Process process = new ProcessBuilder().command("mount | grep /dev/block/vold")
.redirectErrorStream(true).start();
process.waitFor();
final InputStream is = process.getInputStream();
final byte[] buffer = new byte[1024];
while (is.read(buffer) != -1) {
output = output + new String(buffer);
}
is.close();
} catch (final Exception e) {
e.printStackTrace();
}
if(!output.trim().isEmpty()) {
String devicePoints[] = output.split("\n");
for(String voldPoint: devicePoints) {
results.add(voldPoint.split(" ")[2]);
}
}
}
//Below few lines is to remove paths which may not be external memory card, like OTG (feel free to comment them out)
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
for (int i = 0; i < results.size(); i++) {
if (!results.get(i).toLowerCase().matches(".*[0-9a-f]{4}[-][0-9a-f]{4}")) {
Log.d(LOG_TAG, results.get(i) + " might not be extSDcard");
results.remove(i--);
}
}
} else {
for (int i = 0; i < results.size(); i++) {
if (!results.get(i).toLowerCase().contains("ext") && !results.get(i).toLowerCase().contains("sdcard")) {
Log.d(LOG_TAG, results.get(i)+" might not be extSDcard");
results.remove(i--);
}
}
}
String[] storageDirectories = new String[results.size()];
for(int i=0; i<results.size(); ++i) storageDirectories[i] = results.get(i);
return storageDirectories;
}
I found the solution for this over here https://stackoverflow.com/a/13648873/842607
The code is -
public static HashSet<String> getExternalMounts() {
final HashSet<String> out = new HashSet<String>();
String reg = "(?i).*vold.*(vfat|ntfs|exfat|fat32|ext3|ext4).*rw.*";
String s = "";
try {
final Process process = new ProcessBuilder().command("mount")
.redirectErrorStream(true).start();
process.waitFor();
final InputStream is = process.getInputStream();
final byte[] buffer = new byte[1024];
while (is.read(buffer) != -1) {
s = s + new String(buffer);
}
is.close();
} catch (final Exception e) {
e.printStackTrace();
}
// parse output
final String[] lines = s.split("\n");
for (String line : lines) {
if (!line.toLowerCase(Locale.US).contains("asec")) {
if (line.matches(reg)) {
String[] parts = line.split(" ");
for (String part : parts) {
if (part.startsWith("/"))
if (!part.toLowerCase(Locale.US).contains("vold"))
out.add(part);
}
}
}
}
return out;
}
The other one is the hack which I found from the same page -
private static final Pattern DIR_SEPORATOR = Pattern.compile("/");
/**
* Raturns all available SD-Cards in the system (include emulated)
*
* Warning: Hack! Based on Android source code of version 4.3 (API 18)
* Because there is no standart way to get it.
* TODO: Test on future Android versions 4.4+
*
* #return paths to all available SD-Cards in the system (include emulated)
*/
public static String[] getStorageDirectories()
{
// Final set of paths
final Set<String> rv = new HashSet<String>();
// Primary physical SD-CARD (not emulated)
final String rawExternalStorage = System.getenv("EXTERNAL_STORAGE");
// All Secondary SD-CARDs (all exclude primary) separated by ":"
final String rawSecondaryStoragesStr = System.getenv("SECONDARY_STORAGE");
// Primary emulated SD-CARD
final String rawEmulatedStorageTarget = System.getenv("EMULATED_STORAGE_TARGET");
if(TextUtils.isEmpty(rawEmulatedStorageTarget))
{
// Device has physical external storage; use plain paths.
if(TextUtils.isEmpty(rawExternalStorage))
{
// EXTERNAL_STORAGE undefined; falling back to default.
rv.add("/storage/sdcard0");
}
else
{
rv.add(rawExternalStorage);
}
}
else
{
// Device has emulated storage; external storage paths should have
// userId burned into them.
final String rawUserId;
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1)
{
rawUserId = "";
}
else
{
final String path = Environment.getExternalStorageDirectory().getAbsolutePath();
final String[] folders = DIR_SEPORATOR.split(path);
final String lastFolder = folders[folders.length - 1];
boolean isDigit = false;
try
{
Integer.valueOf(lastFolder);
isDigit = true;
}
catch(NumberFormatException ignored)
{
}
rawUserId = isDigit ? lastFolder : "";
}
// /storage/emulated/0[1,2,...]
if(TextUtils.isEmpty(rawUserId))
{
rv.add(rawEmulatedStorageTarget);
}
else
{
rv.add(rawEmulatedStorageTarget + File.separator + rawUserId);
}
}
// Add all secondary storages
if(!TextUtils.isEmpty(rawSecondaryStoragesStr))
{
// All Secondary SD-CARDs splited into array
final String[] rawSecondaryStorages = rawSecondaryStoragesStr.split(File.pathSeparator);
Collections.addAll(rv, rawSecondaryStorages);
}
return rv.toArray(new String[rv.size()]);
}
This library solve my problem.
https://github.com/hendrawd/StorageUtil
What i did is:
private File directory;
String[] allPath;
allPath = StorageUtil.getStorageDirectories(this);
for (String path: allPath){
directory = new File(path);
Methods.update_Directory_Files(directory);
}
Methods.update_Directory_Files()
// Retrieving files from memory
public static void update_Directory_Files(File directory) {
//Get all file in storage
File[] fileList = directory.listFiles();
//check storage is empty or not
if(fileList != null && fileList.length > 0)
{
for (int i=0; i<fileList.length; i++)
{
boolean restricted_directory = false;
//check file is directory or other file
if(fileList[i].isDirectory())
{
for (String path : Constant.removePath){
if (path.equals(fileList[i].getPath())) {
restricted_directory = true;
break;
}
}
if (!restricted_directory)
update_Directory_Files(fileList[i]);
}
else
{
String name = fileList[i].getName().toLowerCase();
for (String ext : Constant.videoExtensions){
//Check the type of file
if(name.endsWith(ext))
{
//first getVideoDuration
String videoDuration = Methods.getVideoDuration(fileList[i]);
long playbackPosition;
long percentage = C.TIME_UNSET;
FilesInfo.fileState state;
/*First check video already played or not. If not then state is NEW
* else load playback position and calculate percentage of it and assign it*/
//check it if already exist or not if yes then start from there else start from start position
int existIndex = -1;
for (int j = 0; j < Constant.filesPlaybackHistory.size(); j++) {
String fListName = fileList[i].getName();
String fPlaybackHisName = Constant.filesPlaybackHistory.get(j).getFileName();
if (fListName.equals(fPlaybackHisName)) {
existIndex = j;
break;
}
}
try {
if (existIndex != -1) {
//if true that means file is not new
state = FilesInfo.fileState.NOT_NEW;
//set playbackPercentage not playbackPosition
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(fileList[i].getPath());
String time = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
retriever.release();
int duration = Integer.parseInt(time);
playbackPosition = Constant.filesPlaybackHistory.get(existIndex).getPlaybackPosition();
if (duration > 0)
percentage = 1000L * playbackPosition / duration;
else
percentage = C.TIME_UNSET;
}
else
state = FilesInfo.fileState.NEW;
//playbackPosition have value in percentage
Constant.allMemoryVideoList.add(new FilesInfo(fileList[i],
directory,videoDuration, state, percentage));
//directory portion
currentDirectory = directory.getPath();
unique_directory = true;
for(int j=0; j<directoryList.size(); j++)
{
if((directoryList.get(j).toString()).equals(currentDirectory)){
unique_directory = false;
}
}
if(unique_directory){
directoryList.add(directory);
}
//When we found extension from videoExtension array we will break it.
break;
}catch (Exception e){
e.printStackTrace();
Constant.allMemoryVideoList.add(new FilesInfo(fileList[i],
directory,videoDuration, FilesInfo.fileState.NOT_NEW, C.TIME_UNSET));
}
}
}
}
}
}
Constant.directoryList = directoryList;
}
in this i have redmi note prime 2.and i have no memory card.so when i found path and File[] externalDirs = getExternalFilesDirs(null); give null second postion value of file[].
}
I'm developing an app for the specific device. When i get external storage path it gives me the location, that is placed on internal memory. I need to find out if there is any removable sd card found on device(true,false).
Use this code to check external sdcard present or not
Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
if(isSDPresent){
}else{
}
It worked for me
public static HashSet<String> getExternalMounts() {
final HashSet<String> out = new HashSet<String>();
String reg = "(?i).*vold.*(vfat|ntfs|exfat|fat32|ext3|ext4).*rw.*";
String s = "";
try {
final Process process = new ProcessBuilder().command("mount")
.redirectErrorStream(true).start();
process.waitFor();
final InputStream is = process.getInputStream();
final byte[] buffer = new byte[1024];
while (is.read(buffer) != -1) {
s = s + new String(buffer);
}
is.close();
} catch (final Exception e) {
e.printStackTrace();
}
// parse output
final String[] lines = s.split("\n");
for (String line : lines) {
if (!line.toLowerCase(Locale.US).contains("asec")) {
if (line.matches(reg)) {
String[] parts = line.split(" ");
for (String part : parts) {
if (part.startsWith("/"))
if (!part.toLowerCase(Locale.US).contains("vold"))
out.add(part);
}
}
}
}
return out;
}
I want to read specific line from file like text.txt then write some string to it. any method to do that on android? I'm still play around with LineNumberReader, but still cant find way to do that.
Thanks.
Why not use a combination of inputstream, bufferedreader, stringbuilder, and an outputstream?
Maybe anybody get the same case like that..
private void Writing() {
// TODO Auto-generated method stub
try {
String[] lines = new String[888];
File internalStorage = Environment.getDataDirectory();
File dir = new File (internalStorage + "/myPde");
File file = new File(dir, "ekfslam.pde");
File file_temp = new File(dir, "ekfslam_temp.txt");
FileWriter fw = new FileWriter(file_temp,true);
BufferedWriter bw = new BufferedWriter(fw);
LineNumberReader lnr = new LineNumberReader(new FileReader(file));
file_temp.createNewFile();
int i = 0;
String Line = "";
while (true) {
Line = lnr.readLine();
if (Line != null) {
lines[i]=Line;
i++;
} else {
break;
}
}
for (int j = 0; j < 50; j+=5) {
lines[95] = lines[95]+"\n\t\t Data "+j;
}
if (file_temp.exists()) {
} else {
file_temp.createNewFile();
}
for (i = 0; i < lines.length; i++){
bw.write(lines[i]);
bw.newLine();
System.out.println(lines[i]);
}
file.delete();
file_temp.renameTo(file);
bw.close();
lnr.close();
} catch (Exception e) {
e.printStackTrace();
}
}
I received a crash report, which is about java.lang.StringIndexOutOfBoundsException in ZhuangDictActivity$SearchDicAsyncTask.doInBackground
Here is the ZhuangDictActivity$SearchDicAsyncTask.doInBackground:
private class SearchDicAsyncTask extends AsyncTask<String, Integer, String> {
private byte searchStatus;
#Override
protected String doInBackground(String... params) {
if (params[0].length() > 0) {
word = params[0].trim();
long[] index = null;
FileAccessor in = null;
DictZipInputStream din = null;
try {
char key = GB2Alpha.Char2Alpha(word.charAt(0));
tableName = DatabaseHelper.transTableName(key);
index = databaseHelper.queryTable(tableName, word);
if (index != null) {
in = new FileAccessor(new File(dictFileName), "r");
byte[] bytes = new byte[(int) index[1]];
if (isDZDict) {
din = new DictZipInputStream(in);
DictZipHeader h = din.readHeader();
int idx = (int) index[0] / h.getChunkLength();
int off = (int) index[0] % h.getChunkLength();
long pos = h.getOffsets()[idx];
in.seek(pos);
byte[] b = new byte[off + (int) index[1]];
din.readFully(b);
System.arraycopy(b, off, bytes, 0, (int) index[1]);
} else {
in.seek(index[0]);
in.read(bytes);
}
wordDefinition = new String(bytes, "UTF-8");
} else {
searchStatus = 0;
return null;
}
} catch (FileNotFoundException ffe) {
searchStatus = 1;
return null;
} catch (IOException ex) {
ex.printStackTrace();
searchStatus = 2;
return null;
} finally {
try {
if (din != null)
din.close();
if (in != null)
in.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
return wordDefinition;
}
}
The complete code is available here.
I have limited knowledge in Java and Android development. How should I solve this? I intended to post the complete stack traces but stackoverflow do not allow me to do so because it stated my question has too many code. Anyway, the line which is causing the problem is char key = GB2Alpha.Char2Alpha(word.charAt(0));.
It is possible that your string contains only white spaces. meaning it passed the condition:
if (params[0].length() > 0)
But when you call trim(), these are removed, resulting in an empty stream and an "IndexOutOfBoundsException" exception being thrown when you execute:
word.charAt(0)
EDIT
This is not the reason. After a test, when trim is called on a String with only whitespaces, the String remains unchanged.