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从Android Q(10.0)开始,Intent.ACTION_SCREEN_CAPTURED_CHANGED字段不再被支持。这是因为Google在安卓10 中引入了一个新的隐私限制,即限制应用在用户开启了屏幕录制功能或截屏功能时获取相应的广播。
public class ScreenCaptureReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (Intent.ACTION_SCREEN_CAPTURES_CHANGED.equals(action)) {
// 截屏操作
// 在这里执行你的逻辑操作
}
}
}
<receiver
android:name=".ScreenCaptureReceiver"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.SCREEN_CAPTURE_CHANGED" />
</intent-filter>
</receiver>
ScreenCaptureReceiver receiver = new ScreenCaptureReceiver();
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_CAPTURE_CHANGED);
registerReceiver(receiver, filter);
unregisterReceiver(receiver);
public class ScreenCaptureReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (Intent.ACTION_SCREEN_CAPTURE_CHANGED.equals(action)) {
// 截屏操作
Toast.makeText(context, "用户进行了截屏操作", Toast.LENGTH_SHORT).show();
}
}
}
另一种监听截屏操作的方法是使用ContentObserver来监听系统截屏文件的变化。以下是一个示例代码:
public class ScreenCaptureObserver extends ContentObserver { private static final String TAG = "ScreenCaptureObserver"; private static final String SCREENSHOTS_DIR = Environment.getExternalStorageDirectory().toString() + "/Pictures/Screenshots"; private Context mContext; public ScreenCaptureObserver(Context context) { super(null); mContext = context; } @Override public void onChange(boolean selfChange) { super.onChange(selfChange); Log.d(TAG, "Screen capture detected"); if (uri.toString().matches(MediaStore.Images.Media.EXTERNAL_CONTENT_URI.toString() + "/[0-9]+")) { Cursor cursor = null; try { cursor = mContext.getContentResolver().query(uri, new String[]{MediaStore.Images.Media.DATA}, null, null, null); if (cursor != null && cursor.moveToFirst()) { String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); if (path != null && path.startsWith(SCREENSHOTS_PATH)) { // 此处为用户截屏行为的响应逻辑 } } } finally { if (cursor != null) { cursor.close(); } } } } public void start() { ContentResolver contentResolver = mContext.getContentResolver(); contentResolver.registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, this); } public void stop() { ContentResolver contentResolver = mContext.getContentResolver(); contentResolver.unregisterContentObserver(this); } }
使用示例:
ScreenCaptureObserver observer = new ScreenCaptureObserver(this);
observer.start();
方案一的优点:
方案一的缺点:
方案二的优点:
方案二的缺点:
根据需求,如果只关心截屏的发生与否,并不需要获取截屏的具体内容,方案一可以考虑。如果需要获取截屏内容的具体信息,方案二比较适合。如果只需要监听应用内的截屏操作,方案一比较方便。如果需要监听系统级别的截屏操作,需要使用方案二。
在 Android 开发中,要监听用户的录屏操作,可以使用以下两种方案:
Android Q之后又前台服务限制
MediaProjectionManager
对象来获取用户录屏的权限。private MediaProjectionManager mediaProjectionManager;
private MediaProjection mediaProjection;
private MediaProjection.Callback projectionCallback;
mediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);
MediaProjection
对象。private static final int REQUEST_CODE_SCREEN_CAPTURE = 1;
Intent intent = mediaProjectionManager.createScreenCaptureIntent();
startActivityForResult(intent, REQUEST_CODE_SCREEN_CAPTURE);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_CODE_SCREEN_CAPTURE && resultCode == RESULT_OK) {
mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data);
startScreenCapture();
}
}
MediaProjection.Callback
监听录屏状态。private VirtualDisplay virtualDisplay; private MediaRecorder mediaRecorder; private void startScreenCapture() { DisplayMetrics metrics = getResources().getDisplayMetrics(); int screenWidth = metrics.widthPixels; int screenHeight = metrics.heightPixels; int screenDensity = metrics.densityDpi; mediaRecorder = new MediaRecorder(); mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); mediaRecorder.setVideoSize(screenWidth, screenHeight); mediaRecorder.setVideoFrameRate(30); mediaRecorder.setOutputFile(getOutputFilePath()); Surface surface = mediaRecorder.getSurface(); virtualDisplay = mediaProjection.createVirtualDisplay( "ScreenCapture", screenWidth, screenHeight, screenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, surface, null, null); mediaRecorder.prepare(); mediaRecorder.start(); projectionCallback = new MediaProjection.Callback() { @Override public void onStop() { stopScreenCapture(); } }; mediaProjection.registerCallback(projectionCallback, null); } private void stopScreenCapture() { if (virtualDisplay != null) { virtualDisplay.release(); virtualDisplay = null; } if (mediaRecorder != null) { mediaRecorder.stop(); mediaRecorder.reset(); mediaRecorder.release(); mediaRecorder = null; } if (mediaProjection != null) { mediaProjection.unregisterCallback(projectionCallback); mediaProjection.stop(); mediaProjection = null; } }
ContentObserver
的观察者类,并重写 onChange()
方法。public class ScreenRecordObserver extends ContentObserver { private static final String SCREEN_RECORD_STATE_PATH = "/sys/class/graphics/fb0/screen_state"; private OnScreenRecordStateChangedListener listener; public ScreenRecordObserver(Handler handler) { super(handler); } public void setOnScreenRecordStateChangedListener(OnScreenRecordStateChangedListener listener) { this.listener = listener; } @Override public void onChange(boolean selfChange, Uri uri) { if (listener != null) { boolean isRecording = isScreenRecording(); listener.onScreenRecordStateChanged(isRecording); } } private boolean isScreenRecording() { try { FileInputStream fis = new FileInputStream(SCREEN_RECORD_STATE_PATH); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(fis)); String state = bufferedReader.readLine(); bufferedReader.close(); return !"0".equals(state); } catch (Exception e) { e.printStackTrace(); } return false; } } public interface OnScreenRecordStateChangedListener { void onScreenRecordStateChanged(boolean isRecording); }
private ScreenRecordObserver screenRecordObserver;
screenRecordObserver = new ScreenRecordObserver(new Handler());
screenRecordObserver.setOnScreenRecordStateChangedListener(new OnScreenRecordStateChangedListener() {
@Override
public void onScreenRecordStateChanged(boolean isRecording) {
if (isRecording) {
// 屏幕开始录制
} else {
// 屏幕停止录制
}
}
});
getContentResolver().registerContentObserver(Uri.parse("content://" + SCREEN_RECORD_STATE_PATH), true, screenRecordObserver);
方案一的优点:
方案一的缺点:
方案二的优点:
方案二的缺点:
不能精确确定录屏的开始和结束时间。
无法获取到录屏的具体内容。
根据需求,如果需要准确监听录屏的开始和结束时间,并且需要获取到录屏的具体内容,推荐使用方案一。
但如果只是需要知道录屏状态变化,而不关心具体的时间和内容,方案二比较简单方便。
在 Android 开发中,要监听用户的投屏操作,可以使用以下两种方案:
首先,在你的 AndroidManifest.xml 文件中添加以下权限:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
MediaRouter.Callback
对象,并重写 onRouteSelected()
和 onRouteUnselected()
方法。private MediaRouter mediaRouter; private MediaRouter.Callback mediaRouterCallback; mediaRouter = (MediaRouter) getSystemService(Context.MEDIA_ROUTER_SERVICE); mediaRouterCallback = new MediaRouter.Callback() { @Override public void onRouteSelected(MediaRouter router, MediaRouter.RouteInfo route) { // 投屏开始 } @Override public void onRouteUnselected(MediaRouter router, MediaRouter.RouteInfo route) { // 投屏结束 } };
mediaRouter.addCallback(MediaRouter.ROUTE_TYPE_LIVE_VIDEO, mediaRouterCallback);
首先,在 AndroidManifest.xml 文件中添加以下权限:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
DisplayManager.DisplayListener
对象,并重写 onDisplayAdded()
、onDisplayRemoved()
和 onDisplayChanged()
方法。private DisplayManager displayManager; private DisplayManager.DisplayListener displayListener; displayManager = (DisplayManager) getSystemService(Context.DISPLAY_SERVICE); displayListener = new DisplayManager.DisplayListener() { @Override public void onDisplayAdded(int displayId) { // 投屏开始 } @Override public void onDisplayRemoved(int displayId) { // 投屏结束 } @Override public void onDisplayChanged(int displayId) { // 投屏状态变化 } };
displayManager.registerDisplayListener(displayListener, null);
方案一的优点:
方案一的缺点:
ROUTE_TYPE_LIVE_VIDEO
的投屏操作,其他类型的投屏操作无法监听到。方案二的优点:
方案二的缺点:
根据需求,如果只需要监听特定类型的投屏操作,并且需要获取投屏的具体内容,推荐使用方案一。
如果需要监听所有类型的投屏操作,方案二比较适合。
同时,如果只关心投屏的开始和结束时间,并不需要具体的投屏内容,两种方案都可以考虑。
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