i have a imageview , i am trying to save bitmap from imageview by this method
bmp.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
the rgb of saved image is not like that it looks in running app,so i am wondering if there is any way to save image view directly to a sd card rather getting the bitmap and then save it to sd card.
please help me i have tried everything.
You can read and write object using below code :
public static void witeObjectToFile(Context context, Object object, String filename)
{
ObjectOutputStream objectOut = null;
try
{
FileOutputStream fileOut = context.openFileOutput(filename, Activity.MODE_PRIVATE);
objectOut = new ObjectOutputStream(fileOut);
objectOut.writeObject(object);
fileOut.getFD().sync();
} catch (IOException e)
{
e.printStackTrace();
} finally
{
if (objectOut != null)
{
try
{
objectOut.close();
} catch (IOException e)
{
// do nowt
}
}
}
}
public static Object readObjectFromFile(Context context, String filename)
{
ObjectInputStream objectIn = null;
Object object = null;
try
{
FileInputStream fileIn = context.getApplicationContext().openFileInput(filename);
objectIn = new ObjectInputStream(fileIn);
object = objectIn.readObject();
} catch (FileNotFoundException e)
{
// Do nothing
} catch (IOException e)
{
e.printStackTrace();
} catch (ClassNotFoundException e)
{
e.printStackTrace();
} finally
{
if (objectIn != null)
{
try
{
objectIn.close();
} catch (IOException e)
{
// do nowt
}
}
}
return object;
}
For example ArrayList can be saved as :
ImageView abcImage = (ImageView) readObjectFromFile(context, AppConstants.FILE_PATH_TO_DATA);
and write as :
witeObjectToFile(context, abcImage, AppConstants.FILE_PATH_TO_DATA);
Try to use this
public void onClick(View v) {
if (v.getId() == R.id.btnSaveImage) {
imageView.setDrawingCacheEnabled(true);
Bitmap bm = imageView.getDrawingCache();
storeImage(bm);
}
}
private boolean storeImage(Bitmap imageData) {
// get path to external storage (SD card)
String iconsStoragePath = Environment.getExternalStorageDirectory() + "/yourappname/";
File sdIconStorageDir = new File(iconsStoragePath);
// create storage directories, if they don't exist
sdIconStorageDir.mkdirs();
try {
File file = new File(sdIconStorageDir.toString() + File.separator + "fileName");
FileOutputStream fileOutputStream = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(fileOutputStream);
imageData.compress(CompressFormat.PNG, 100, bos);
bos.flush();
bos.close();
MediaScannerConnection.scanFile(this, new String[] { file.getPath() },
new String[] { "image/jpeg" }, null);
Toast.makeText(this, "Snapshot Saved to " + file, Toast.LENGTH_SHORT).show();
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
return false;
}
return true;
}
Related
How do I load the same picture the user has selected even after the user closes the app?
I currently have the following code which I call in onCreate, but the Bitmap is null every time the user closes the app.
private void loadImageFromStorage() {
ContextWrapper cw = new ContextWrapper(getApplicationContext());
File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
File myPath = new File(directory,"profile.jpg");
FileOutputStream fos = null;
try {
fos = new FileOutputStream(myPath);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
File f = new File(directory.getAbsolutePath(), "profile.jpg");
Bitmap b = BitmapFactory.decodeStream(new FileInputStream(f));
ImageView coverView = findViewById(R.id.cover_view);
coverView.setImageBitmap(b);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
Assuming the image was actually saved as profile.jpg and it exists in the imageDir folder, all you need to do to load the image (based on your current usage) is:
private void loadImageFromStorage() {
ContextWrapper cw = new ContextWrapper(getApplicationContext());
File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
File myFile = new File(directory.getAbsolutePath(),"profile.jpg");
if(myFile.exists()){
try {
Bitmap b = BitmapFactory.decodeFile(myFile.getAbsolutePath());
ImageView coverView = findViewById(R.id.cover_view);
coverView.setImageBitmap(b);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else {
Log.d("MyApp", "The image file does not exist.");
}
}
But if the image is not yet saved or non-existence, then you may need to ask another question that details how you are currently doing it. But this setup will allow you know if that image actually existts.
How can change image saving location i have created the folder but how to save image in it. all downloaded images are saved in pictures folder
#Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
ContentResolver r = contentResolverWeakReference.get();
AlertDialog alertDialog = alertDialogWeakReference.get();
if (r != null)
file = new File(Environment.getExternalStorageDirectory().getPath() + "/CreativeGraphy");
if (!file.exists()) {
file.mkdir();
}
try {
file.createNewFile();
MediaStore.Images.Media.insertImage(r, bitmap, name, desc);
} catch (Exception e) {
e.printStackTrace();
}
alertDialog.dismiss();
Toast.makeText(context, "Download succeed ", Toast.LENGTH_SHORT).show();
}
Use this method
public static void saveBitmap(String path, Bitmap bitmap) {
FileOutputStream out = null;
try {
out = new FileOutputStream(path);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
After saving you can call scanFile method to index your file in the gallery.
MediaScannerConnection.scanFile(context, new String[]{path}, null, null);
thanks everyone This works
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
ContentResolver r = contentResolverWeakReference.get();
AlertDialog alertDialog = alertDialogWeakReference.get();
if (r != null)
file_path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/CreativeGraphy";
File dir = new File(file_path);
if (!dir.exists()) {
dir.mkdir();
}
File file = new File(dir,name );
FileOutputStream fOut;
try {
MediaStore.Images.Media.insertImage(r, bitmap, name, desc);
fOut = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
fOut.flush();
fOut.close();
} catch (Exception e) {
e.printStackTrace();
}
alertDialog.dismiss();
Toast.makeText(context, "Download succeed ", Toast.LENGTH_SHORT).show();
}
I've created Test.txt on sdcard and write string "test example" on it.
after that, I replace string "test" by "etc" in Test.txt.
this is my code :
String origin_str, old_str , new_str;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_t2);
origin_str = "test example";
old_str = "test";
new_str = "etc";
Button bt_create2 = (Button)findViewById(R.id.bt_createfileT2);
bt_create2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
File newFolder = new File(Environment.getExternalStorageDirectory(), "TestFolder");
if (!newFolder.exists()) {
newFolder.mkdir();
}
File file = new File(newFolder, "Test" + ".txt");
if (!file.exists()) {
file.createNewFile();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter =new OutputStreamWriter(fOut);
myOutWriter.append(origin_str);
myOutWriter.close();
fOut.close();
}
} catch (Exception e) {
System.out.println("e: " + e);
}
}
});
Button bt_replacefileT2 = (Button)findViewById(R.id.bt_replacefileT2);
bt_replacefileT2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
File file = new File(Environment.getExternalStorageDirectory() + "/TestFolder/Test.txt");
FileInputStream in = new FileInputStream(file);
int len = 0;
byte[] data1 = new byte[1024];
while ( -1 != (len = in.read(data1)) ){
if(new String(data1, 0, len).contains(old_str)){
String s = "";
s = s.replace(old_str, new_str);
}
}
}
catch (Exception e){
e.printStackTrace();
}
}
});
with this code, it was create Test.txt on sdcard and write "test example" on it.
but when replace string "test" by "etc", it not working.
how to fix it?
I will give my code, always worked for me :)
Hope thi can help you :DD
public void saveString(String text){
if(this.isExternalStorageAvailable()){
if(!this.isExternalStorageReadOnly()){
try {
FileOutputStream fos = new FileOutputStream(
new File(this.getExternalFilesDir("text"), "text.dat"));
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeBytes(text);
oos.close();
fos.close();
} catch (FileNotFoundException e) {
//Toast.makeText(main, "Eror opening file", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
//Toast.makeText(main, "Eror saving String", Toast.LENGTH_SHORT).show();
}
}
}
}
private static boolean isExternalStorageAvailable(){
String estadoSD = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED.equals(estadoSD))
return true;
return false;
}
private static boolean isExternalStorageReadOnly(){
String estadoSD = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED_READ_ONLY.equals(estadoSD))
return true;
return false;
}
public String getString(){
FileInputStream fis = null;
ObjectInputStream ois = null;
if(this.isExternalStorageAvailable()) {
try {
fis = new FileInputStream(
new File(this.getExternalFilesDir("text"), "text.dat"));
ois = new ObjectInputStream(fis);
String text = (String)ois.readObject();
return familia;
} catch (FileNotFoundException e) {
//Toast.makeText(main, "The file text doesnt exist", Toast.LENGTH_SHORT).show();
} catch (StreamCorruptedException e) {
//Toast.makeText(main, "Eror opening file", Toast.LENGTH_SHORT).show();
} catch(EOFException e){
try {
if(ois != null)
ois.close();
if(fis != null)
fis.close();
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (IOException e) {
//Toast.makeText(main, "eror reading file", Toast.LENGTH_SHORT).show();
} catch (ClassNotFoundException e) {
//Toast.makeText(main, "String class doesnt exist", Toast.LENGTH_SHORT).show();
}
}
return null;
}
try this
File file = new File(Environment.getExternalStorageDirectory() + "/TestFolder/Test.txt");
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
line = line.replace(old,new);
}
br.close();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter =new OutputStreamWriter(fOut);
myOutWriter.write(line);
myOutWriter.close();
fOut.close();
}
catch (IOException e) {
//You'll need to add proper error handling here
}
I'm looking for a kind of Serialization for the java.security.KeyPair to store and read from the Shared Preferences.
Storing the .toString() is now quite sinful cause there is no Constructor for the KeyPair.
Suggestions?
I'm afraid there is no way of storing a Serializable object in SharedPreferences. I recommend looking into saving it as a private file, see Android Storage Options, FileOutputStream and ObjectOutputStream for more information.
public static void write(Context context, Object obj, String filename) {
ObjectOutputStream oos = null;
try {
FileOutputStream file = context.openFileOutput(filename, Activity.MODE_PRIVATE);
oos = new ObjectOutputStream(file);
oos.writeObject(obj);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (oos != null) {
try {
oos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static Object read(Context context, String filename) {
ObjectInputStream ois = null;
Object obj = null;
try {
FileInputStream file = context.getApplicationContext().openFileInput(filename);
ois = new ObjectInputStream(file);
obj = ois.readObject();
} catch (FileNotFoundException e) {
// Just let it return null.
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
if (ois != null) {
try {
ois.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return obj;
}
I actually solved in it this way:
I first create a String by using Base64, which I store and then recreate from the Shared Proferences:
SharedPreferences prefs = this.getSharedPreferences(
PATH, Context.MODE_PRIVATE);
String key = prefs.getString(KEYPATH, "");
if (key.equals("")) {
// generate KeyPair
KeyPair kp = Encrypter.generateKeyPair();
ByteArrayOutputStream b = new ByteArrayOutputStream();
ObjectOutputStream o;
try {
o = new ObjectOutputStream(b);
o.writeObject(kp);
} catch (IOException e) {
e.printStackTrace();
}
byte[] res = b.toByteArray();
String encodedKey = Base64.encodeToString(res, Base64.DEFAULT);
prefs.edit().putString(KEYPATH, encodedKey).commit();
} else {
// read the KeyPair from internal storage
byte[] res = Base64.decode(key, Base64.DEFAULT);
ByteArrayInputStream bi = new ByteArrayInputStream(res);
ObjectInputStream oi;
try {
oi = new ObjectInputStream(bi);
Object obj = oi.readObject();
Encrypter.setMyKeyPair((KeyPair) obj);
Log.w(TAG, ((KeyPair) obj).toString());
} catch (StreamCorruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
I am new in Android.
I am downloading images from the internet in the ListView .I getting the url in the file object but when I send it into the Bitmap object the bitmap object is return null means image is not loaded into the bitmap object.please reply me. the code is here:
private Bitmap getBitmap(String url) {
String filename = String.valueOf(url.hashCode());
File f = new File(cacheDir, filename);
// here in f i getting image url
// here in bitmap the url is not loaded & get null
Bitmap bitmap = BitmapFactory.decodeFile(f.getPath());
if(bitmap != null) return bitmap;
// Nope, have to download it
try {
bitmap =
BitmapFactory.decodeStream(new URL(url).openConnection().getInputStream());
// save bitmap to cache for later
writeFile(bitmap, f);
return bitmap;
} catch (Exception ex) {
ex.printStackTrace();
return null;
}
}
private void writeFile(Bitmap bmp, File f) {
FileOutputStream out = null;
try {
out = new FileOutputStream(f);
bmp.compress(Bitmap.CompressFormat.PNG, 80, out);
} catch (Exception e) {
e.printStackTrace();
}
finally {
try { if (out != null ) out.close(); }
catch(Exception ex) {}
}
}
I do not think you are downloading properly the bitmap.
CODE
This is a function I created that will take a url from you and it will return a drawable!
It will save it to a file and get it if it exists
If not, it will download it and return the drawable.
You can easily edit it to save file to your folder instead.
/**
* Pass in an image url to get a drawable object
*
* #return a drawable object
*/
private static Drawable getDrawableFromUrl(final String url) {
String filename = url;
filename = filename.replace("/", "+");
filename = filename.replace(":", "+");
filename = filename.replace("~", "s");
final File file = new File(Environment.getExternalStorageDirectory()
+ File.separator + filename);
boolean exists = file.exists();
if (!exists) {
try {
URL myFileUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
final Bitmap result = BitmapFactory.decodeStream(is);
is.close();
new Thread() {
public void run() {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
result.compress(Bitmap.CompressFormat.JPEG, 40, bytes);
try {
if (file.createNewFile()){
//
}
else{
//
}
FileOutputStream fo;
fo = new FileOutputStream(file);
fo.write(bytes.toByteArray());
fo.flush();
fo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
BitmapDrawable returnResult = new BitmapDrawable(result);
return returnResult;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
else {
return new BitmapDrawable(BitmapFactory.decodeFile(file.toString()));
}
}
Only thing I can think of here is that you're missing INTERNET permission in your manifest.
Try adding <uses-permission android:name="android.permission.INTERNET" /> in your AndroidManifest.xml if it's not there yet