Develop Reference

how to save multiple bitmaps fastly in android studio

I want to save bitmaps in the gallery.
Currently, I am using the following code:
public void saveBitmap(Bitmap output){
String filepath = Environment.getExternalStorageDirectory().toString() + "/Imverter/ImverterEffectedImage";
File dir = new File(filepath);
if(!dir.exists()){
dir.mkdir();
}
String fileName = "Imverter" + System.currentTimeMillis() + ".jpg";
File image = new File(dir, fileName);
try {
FileOutputStream fileOutputStream = new FileOutputStream(image);
output.compress(Bitmap.CompressFormat.JPEG, 80, fileOutputStream);
fileOutputStream.flush();
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
It saves one single bitmap efficiently, but in my app, I have to deal with multiple bitmaps, and this method results in the slow output.
I want to store every single bitmap in a different files.
Thanks in advance.

I want to load an image using Picasso from a file path

I want to load an image from a file path which I have already defined, but don't want to instantiate another file object since I have already defined the path when saving the image.
I have tried retrieving the image with:
Picasso.with(this).load(filename).into(image_tv);
This is my code for saving the image;
Bitmap bitMapImg;
void saveImage() {
File filename;
try {
String path =
Environment.getExternalStorageDirectory().toString();
new File(path + "/folder/subfolder").mkdirs();
filename = new
File(path+"/folder/subfolder/image.jpg");
FileOutputStream out = new FileOutputStream(filename);
bitMapImg.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}

Use this
Picasso.with(context).load(Uri.parse("file://" + yourFilePath).into(imageView);

webview saves same screenshot again android

The below code captures the webview image and save it in Pictures folder. The code is as follows
public static void getBitmapOfWebView(final WebView webView){
Date now = new Date();
String mPath = Environment.getExternalStorageDirectory() + File.separator + Environment.DIRECTORY_PICTURES + File.separator + "Screenshot_" + now + ".jpg";
webView.setDrawingCacheEnabled(true);
webView.buildDrawingCache(true);
Picture picture = webView.capturePicture();
Bitmap b = Bitmap.createBitmap( webView.getWidth(), webView.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
picture.draw(c);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(mPath);
if ( fos != null ) {
b.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.close();
}
}
catch(Exception e) {}
b.recycle();
}
The above code works and saves the screenshot in the pictures folder. But the problem is when i scroll down the WebView and try to execute the same code again, it saves the old screenshot of the webview in the pictures folder.
How do i code in such a way that when i scroll the Webview, it should save the current screenshot of the webview.
Any help Appreciated.
Thank you.

Saving a bitmap file in android and reading back to display in Imageview

I have a bitmap file which i need to upload to my php server but as the file is very large I decided to resize it and save it. Later on I try to read it back to display resized image. But this time I am not getting the same image
Below is code for writing image and returning File
public static File savebitmap(Bitmap bmp) throws IOException {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
File f = new File(Environment.getExternalStorageDirectory()
+ File.separator + "testimage.jpg");
f.createNewFile();
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.close();
return f;
}
Below is code for reading and displaying
File file=ImageUtil.savebitmap(this.bitmap);
this.imgChoosenImage.setImageURI(Uri.parse(file.getAbsolutePath()));
Please tell me what exactly is going wrong here

first check the images are saved in ur path as defined, and Make sure ur giving correct path for retriving image.
I have used this below code for saving imge in gallery
String iconsStoragePath = Environment.getExternalStorageDirectory()+ File.separator;
File sdIconStorageDir = new File(iconsStoragePath);
//create storage directories, if they don't exist
sdIconStorageDir.mkdirs();
try {
String filePath = null;
filePath = Environment.getExternalStorageDirectory() + File.separator + "testimage" + ".jpg";
FileOutputStream fileOutputStream = new FileOutputStream(filePath);
BufferedOutputStream bos = new BufferedOutputStream(fileOutputStream);
bmp.compress(Bitmap.CompressFormat.JPG, 100, bos);
bos.flush();
bos.close();
} catch (IOException e) {
Log.w("TAG", "Error saving image file: " + e.getMessage());
Toast.makeText(getApplicationContext(), "Failed to Create folder",
Toast.LENGTH_SHORT).show();
}
For bitmap display in imageview :
File imgFile = new File("/sdcard/Images/testimage.jpg");
//Here File file = ur file path
if(imgFile.exists())
{
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
ImageView myImage = (ImageView) findViewById(R.id.imageviewTest);
myImage.setImageBitmap(myBitmap);
}
Permissions:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

ScreenShot in android is not working

This is my code and im trying to capture screenshot of my application.I have background as animation(hearts falling)which looks like a live wallpaper.I want to take screenshot of current page>But its not working.I have used a button to take scrrenshot and imageview to show preview.when button is clicked nothing happens>Iam new to android.Plz help.Thanks in advance!!
View view = findViewById(R.id.Flayout);
view.setDrawingCacheEnabled(true);
Bitmap bitmap = view.getDrawingCache();
BitmapDrawable bitmapDrawable = new BitmapDrawable(bitmap);
imgshot = (ImageView) findViewById(R.id.imagescreen);
// set screenshot bitmapdrawable to imageview
imgshot.setBackgroundDrawable(bitmapDrawable);
if (Environment.MEDIA_MOUNTED.equals(Environment
.getExternalStorageState()))
{
// we check if external storage is available, otherwise
// display an error message to the user using Toast Message
File sdCard = Environment.getExternalStorageDirectory();
File directory = new File(sdCard.getAbsolutePath()
+ "/ScreenShots");
directory.mkdirs();
String filename = "screenshot" + i + ".jpg";
File yourFile = new File(directory, filename);
while (yourFile.exists())
{
i++;
filename = "screenshot" + i + ".jpg";
yourFile = new File(directory, filename);
}
if (!yourFile.exists())
{
if (directory.canWrite())
{
try
{
FileOutputStream out = new FileOutputStream(
yourFile, true);
bitmap.compress(Bitmap.CompressFormat.PNG, 90,
out);
out.flush();
out.close();
Toast.makeText(
ResultActivity.this,
"File exported to /sdcard/ScreenShots/screenshot"
+ i + ".jpg",
Toast.LENGTH_SHORT).show();
i++;
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
} else
{
Toast.makeText(ResultActivity.this,
"Sorry SD Card not available in your Device!",
Toast.LENGTH_SHORT).show();
}
break;
}
}
}

Well, check this out:
How to programmatically take a screenshot in Android?
Here looks like what you want to do (as i understand), so test it out.

you have not get the root view. try this code
File file = new File(Environment.getExternalStorageDirectory()+ File.separator + "myimage.jpg");
// create bitmap
Bitmap bitmap;
View v1 = getWindow().getDecorView().getRootView(); //if this didnt work then try sol -3 at the bottom of this answer
v1.setDrawingCacheEnabled(true);
bitmap = Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 40, bytes);
file.createNewFile();
FileOutputStream fo = new FileOutputStream(file);
fo.write(bytes.toByteArray());
fo.close();
if this didnt work
View v1 = mCurrentUrlMask.getRootView();
then try this
View v1 = getWindow().getDecorView().getRootView();
or you can do
sol -3 ) View v1 = findViewById(R.id.linear_layout_id);// add the root view id
Don't forget to add permissions or it wont work:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>