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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import org.mozilla.gecko.AppConstants.Versions;
import org.mozilla.gecko.permissions.Permissions;
import org.mozilla.gecko.util.ThreadUtils;
import android.Manifest;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.util.Log;
public class ScreenshotObserver {
private static final String LOGTAG = "GeckoScreenshotObserver";
public Context context;
/**
* Listener for screenshot changes.
*/
public interface OnScreenshotListener {
/**
* This callback is executed on the UI thread.
*/
public void onScreenshotTaken(String data, String title);
}
private OnScreenshotListener listener;
public ScreenshotObserver() {
}
public void setListener(Context context, OnScreenshotListener listener) {
this.context = context;
this.listener = listener;
}
private MediaObserver mediaObserver;
private String[] mediaProjections = new String[] {
MediaStore.Images.ImageColumns.DATA,
MediaStore.Images.ImageColumns.DISPLAY_NAME,
MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,
MediaStore.Images.ImageColumns.DATE_TAKEN,
MediaStore.Images.ImageColumns.TITLE
};
/**
* Start ScreenshotObserver if this device is supported and all required runtime permissions
* have been granted by the user. Calling this method will not prompt for permissions.
*/
public void start() {
Permissions.from(context)
.withPermissions(Manifest.permission.WRITE_EXTERNAL_STORAGE)
.doNotPrompt()
.run(startObserverRunnable());
}
private Runnable startObserverRunnable() {
return new Runnable() {
@Override
public void run() {
try {
if (mediaObserver == null) {
mediaObserver = new MediaObserver();
context.getContentResolver().registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, false, mediaObserver);
}
} catch (Exception e) {
Log.e(LOGTAG, "Failure to start watching media: ", e);
}
}
};
}
public void stop() {
if (mediaObserver == null) {
return;
}
try {
context.getContentResolver().unregisterContentObserver(mediaObserver);
mediaObserver = null;
} catch (Exception e) {
Log.e(LOGTAG, "Failure to stop watching media: ", e);
}
}
public void onMediaChange(final Uri uri) {
// Make sure we are on not on the main thread.
final ContentResolver cr = context.getContentResolver();
ThreadUtils.postToBackgroundThread(new Runnable() {
@Override
public void run() {
// Find the most recent image added to the MediaStore and see if it's a screenshot.
final Cursor cursor = cr.query(uri, mediaProjections, null, null, MediaStore.Images.ImageColumns.DATE_ADDED + " DESC LIMIT 1");
try {
if (cursor == null) {
return;
}
while (cursor.moveToNext()) {
String data = cursor.getString(0);
Log.i(LOGTAG, "data: " + data);
String display = cursor.getString(1);
Log.i(LOGTAG, "display: " + display);
String album = cursor.getString(2);
Log.i(LOGTAG, "album: " + album);
long date = cursor.getLong(3);
String title = cursor.getString(4);
Log.i(LOGTAG, "title: " + title);
if (album != null && album.toLowerCase().contains("screenshot")) {
if (listener != null) {
listener.onScreenshotTaken(data, title);
break;
}
}
}
} catch (Exception e) {
Log.e(LOGTAG, "Failure to process media change: ", e);
} finally {
if (cursor != null) {
cursor.close();
}
}
}
});
}
private class MediaObserver extends ContentObserver {
public MediaObserver() {
super(null);
}
@Override
public void onChange(boolean selfChange) {
super.onChange(selfChange);
onMediaChange(MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
}
}
}
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