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Refactor Android implementation to use ContentObserver #43

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Refactor Android implementation to use ContentObserver #43

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8 changes: 8 additions & 0 deletions android/build.gradle
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Expand Up @@ -20,6 +20,7 @@ rootProject.allprojects {
}

apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'

android {
compileSdkVersion 30
Expand All @@ -32,3 +33,10 @@ android {
disable 'InvalidPackage'
}
}
dependencies {
implementation "androidx.core:core-ktx:+"
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}
repositories {
mavenCentral()
}
2 changes: 1 addition & 1 deletion android/src/main/AndroidManifest.xml
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Expand Up @@ -2,5 +2,5 @@
package="com.flutter.moum.screenshot_callback">

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

</manifest>
21 changes: 0 additions & 21 deletions android/src/main/java/com/flutter/moum/screenshot_callback/Path.java
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This file was deleted.

101 changes: 42 additions & 59 deletions android/src/main/java/com/flutter/moum/screenshot_callback/ScreenshotCallbackPlugin.java
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@@ -1,87 +1,70 @@
package com.flutter.moum.screenshot_callback;

import android.content.Context;
import android.os.Handler;
import android.os.Looper;

import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
import io.flutter.plugin.common.MethodChannel.Result;
import io.flutter.plugin.common.PluginRegistry.Registrar;
import kotlin.Unit;
import kotlin.jvm.functions.Function1;

import android.os.Build;
import android.os.FileObserver;

import android.os.Handler;
import android.os.Looper;
//import android.util.Log;

import java.io.File;
import java.util.List;
import java.util.ArrayList;

public class ScreenshotCallbackPlugin implements MethodCallHandler {
private static MethodChannel channel;
ScreenshotCallbackPlugin(Context context) {
_context = context;
}

private static MethodChannel _channel;
private static final String _tag = "screenshot_callback";

private Handler handler;
private FileObserver fileObserver;
private String TAG = "tag";
private final Context _context;

private Handler _handler;
private ScreenshotDetector _detector;
private String _lastScreenshotName;

public static void registerWith(Registrar registrar) {
channel = new MethodChannel(registrar.messenger(), "flutter.moum/screenshot_callback");
channel.setMethodCallHandler(new ScreenshotCallbackPlugin());
_channel = new MethodChannel(registrar.messenger(), "flutter.moum/screenshot_callback");
_channel.setMethodCallHandler(new ScreenshotCallbackPlugin(registrar.context()));
}

@Override
public void onMethodCall(MethodCall call, Result result) {
//Log.d(TAG, "onMethodCall: ");

if (call.method.equals("initialize")) {
handler = new Handler(Looper.getMainLooper());
if (Build.VERSION.SDK_INT >= 29) {
//Log.d(TAG, "android x");
List<File> files = new ArrayList<File>();
for (Path path : Path.values()) {
files.add(new File(path.getPath()));
}
_handler = new Handler(Looper.getMainLooper());

fileObserver = new FileObserver(files, FileObserver.CREATE) {
@Override
public void onEvent(int event, String path) {
//Log.d(TAG, "androidX onEvent");
if (event == FileObserver.CREATE) {
handler.post(new Runnable() {
@Override
public void run() {
channel.invokeMethod("onCallback", null);
}
});
}
}
};
fileObserver.startWatching();
} else {
//Log.d(TAG, "android others");
for (Path path : Path.values()) {
//Log.d(TAG, "onMethodCall: "+path.getPath());
fileObserver = new FileObserver(path.getPath(), FileObserver.CREATE) {
@Override
public void onEvent(int event, String path) {
//Log.d(TAG, "android others onEvent");
if (event == FileObserver.CREATE) {
handler.post(new Runnable() {
@Override
public void run() {
channel.invokeMethod("onCallback", null);
}
});
_detector = new ScreenshotDetector(_context, new Function1<String, Unit>() {
@Override
public Unit invoke(String screenshotName) {
// Log.d(_tag, "onScreenshotDetected: " + screenshotName);

if (!screenshotName.equals(_lastScreenshotName)) {
_lastScreenshotName = screenshotName;
_handler.post(new Runnable() {
@Override
public void run() {
// Log.d(_tag, "onCallback: ");
_channel.invokeMethod("onCallback", null);
}
}
};
fileObserver.startWatching();
});
}

return null;
}
}
});
_detector.start();

result.success("initialize");
} else if (call.method.equals("dispose")) {
fileObserver.stopWatching();
_detector.stop();
_detector = null;
_lastScreenshotName = null;

result.success("dispose");
} else {
result.notImplemented();
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111 changes: 111 additions & 0 deletions android/src/main/java/com/flutter/moum/screenshot_callback/ScreenshotDetector.kt
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@@ -0,0 +1,111 @@
package com.flutter.moum.screenshot_callback

import android.content.ContentResolver
import android.content.Context
import android.database.ContentObserver
import android.net.Uri
import android.os.Build
import android.os.Handler
import android.os.Looper
import android.provider.MediaStore

class ScreenshotDetector(private val context: Context,
private val callback: (name: String) -> Unit) {

private var contentObserver: ContentObserver? = null

fun start() {
if (contentObserver == null) {
contentObserver = context.contentResolver.registerObserver()
}
}

fun stop() {
contentObserver?.let { context.contentResolver.unregisterContentObserver(it) }
contentObserver = null
}

private fun reportScreenshotsUpdate(uri: Uri) {
val screenshots: List<String> = queryScreenshots(uri)
if (screenshots.isNotEmpty()) {
callback.invoke(screenshots.last());
}
}

private fun queryScreenshots(uri: Uri): List<String> {
return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
queryRelativeDataColumn(uri)
} else {
queryDataColumn(uri)
}
}

private fun queryDataColumn(uri: Uri): List<String> {
val screenshots = mutableListOf<String>()

val projection = arrayOf(
MediaStore.Images.Media.DATA
)
context.contentResolver.query(
uri,
projection,
null,
null,
null
)?.use { cursor ->
val dataColumn = cursor.getColumnIndex(MediaStore.Images.Media.DATA)

while (cursor.moveToNext()) {
val path = cursor.getString(dataColumn)
if (path.contains("screenshot", true)) {
screenshots.add(path)
}
}
}

return screenshots
}

private fun queryRelativeDataColumn(uri: Uri): List<String> {
val screenshots = mutableListOf<String>()

val projection = arrayOf(
MediaStore.Images.Media.DISPLAY_NAME,
MediaStore.Images.Media.RELATIVE_PATH
)
context.contentResolver.query(
uri,
projection,
null,
null,
null
)?.use { cursor ->
val relativePathColumn =
cursor.getColumnIndex(MediaStore.Images.Media.RELATIVE_PATH)
val displayNameColumn =
cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME)
while (cursor.moveToNext()) {
val name = cursor.getString(displayNameColumn)
val relativePath = cursor.getString(relativePathColumn)
if (name.contains("screenshot", true) or
relativePath.contains("screenshot", true)
) {
screenshots.add(name)
}
}
}

return screenshots
}

private fun ContentResolver.registerObserver(): ContentObserver {
val contentObserver = object : ContentObserver(Handler(Looper.getMainLooper())) {
override fun onChange(selfChange: Boolean, uri: Uri?) {
super.onChange(selfChange, uri)
uri?.let { reportScreenshotsUpdate(it) }
}
}
registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, contentObserver)
return contentObserver
}
}
2 changes: 2 additions & 0 deletions example/android/build.gradle
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@@ -1,11 +1,13 @@
buildscript {
ext.kotlin_version = '1.5.0'
repositories {
google()
jcenter()
}

dependencies {
classpath 'com.android.tools.build:gradle:3.5.3'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}

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4 changes: 2 additions & 2 deletions example/pubspec.lock
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Expand Up @@ -87,14 +87,14 @@ packages:
name: permission_handler
url: "https://pub.dartlang.org"
source: hosted
version: "5.0.1+1"
version: "5.1.0+2"
permission_handler_platform_interface:
dependency: transitive
description:
name: permission_handler_platform_interface
url: "https://pub.dartlang.org"
source: hosted
version: "2.0.1"
version: "2.0.2"
plugin_platform_interface:
dependency: transitive
description:
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4 changes: 2 additions & 2 deletions pubspec.lock
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Expand Up @@ -87,14 +87,14 @@ packages:
name: permission_handler
url: "https://pub.dartlang.org"
source: hosted
version: "5.0.1+1"
version: "5.1.0+2"
permission_handler_platform_interface:
dependency: transitive
description:
name: permission_handler_platform_interface
url: "https://pub.dartlang.org"
source: hosted
version: "2.0.1"
version: "2.0.2"
plugin_platform_interface:
dependency: transitive
description:
Expand Down
2 changes: 1 addition & 1 deletion pubspec.yaml
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Expand Up @@ -10,7 +10,7 @@ environment:
dependencies:
flutter:
sdk: flutter
permission_handler: ^5.0.1+1
permission_handler: ^5.1.0+2

dev_dependencies:
flutter_test:
Expand Down