I need to screenshots of Android device or emulator programmatically when my application is installed and running in the background for every 200 milliseconds and save the images in my computer. I have implemented this procedure using below code and works only when my application is in foreground. I want to take screenshots when my application is in background as well. Below is my code:
public static Bitmap takeScreenshot(Activity activity, int ResourceID) {
Random r = new Random();
int iterator=r.nextInt();
String mPath = Environment.getExternalStorageDirectory().toString() + "/screenshots/";
View v1 = activity.getWindow().getDecorView().findViewById(ResourceID);
v1.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
v1.layout(0, 0, v1.getMeasuredWidth(), v1.getMeasuredHeight());
v1.setDrawingCacheEnabled(true);
final Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
Bitmap resultBitmap = Bitmap.createScaledBitmap(bitmap, 640, 480, false);
v1.setDrawingCacheEnabled(false);
File imageFile = new File(mPath);
imageFile.mkdirs();
imageFile = new File(imageFile+"/"+iterator+"_screenshot.png");
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
resultBitmap.compress(CompressFormat.PNG, 100, bos);
byte[] bitmapdata = bos.toByteArray();
//write the bytes in file
FileOutputStream fos = new FileOutputStream(imageFile);
fos.write(bitmapdata);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return bitmap;
}
How can I implement the functionality of Refresh and Save buttons of Screencapture in Devices -> DDMS
programmatically? Can I achieve that?
Hold down the power button and press the volume-down button. Or... Go to the app and / or page you want to take a screenshot of. Swipe up from the bottom of the screen to the Recents screen; you'll see a button for Screenshot at the bottom of the screen.
If your phone is rooted try this
Process sh = Runtime.getRuntime().exec("su", null,null);
OutputStream os = sh.getOutputStream();
os.write(("/system/bin/screencap -p " + "/sdcard/img.png").getBytes("ASCII"));
os.flush();
os.close();
sh.waitFor();
then read img.png as bitmap and convert it jpg as follows
Bitmap screen = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()+
File.separator +"img.png");
//my code for saving
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
screen.compress(Bitmap.CompressFormat.JPEG, 15, bytes);
//you can create a new file name "test.jpg" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory()+ File.separator + "test.jpg");
f.createNewFile();
//write the bytes in file
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
// remember close de FileOutput
fo.close();
you have no access to the screen if your application is in background unless you are rooted, the code above can take the screenshot most effectively of any screen even if you are in background.
UPDATE
Google has a library with which you can take screenshot without rooting, I tried that, But iam sure that it will eat out the memory as soon as possible.
Try http://code.google.com/p/android-screenshot-library/
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