需求是获得用户截图，或者拍照的主动存图行为。

但是 android 官方没有提供回调广播之类的实现监听，所以需要用另一种方式达到需求，这里实现的就是通过监听media文件夹实现目的。

所需权限：

android:name="android.permission.READ_EXTERNAL_STORAGE"/>

public abstract class ScreenShotContentObserver extends ContentObserver {

private Context context;

private boolean isFromEdit = false;

private String previousPath;

public ScreenShotContentObserver(Handler handler, Context context) {

super(handler);

this.context = context;

}

@Override

public boolean deliverSelfNotifications() {

return super.deliverSelfNotifications();

}

@Override

public void onChange(boolean selfChange) {

super.onChange(selfChange);

}

@Override

public void onChange(boolean selfChange, Uri uri) {

Cursor cursor = null;

try {

cursor = context.getContentResolver().query(uri, new String[]{

MediaStore.Images.Media.DISPLAY_NAME,

MediaStore.Images.Media.DATA

}, null, null, null);

if (cursor != null && cursor.moveToLast()) {

int displayNameColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME);

int dataColumnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);

String fileName = cursor.getString(displayNameColumnIndex);

String path = cursor.getString(dataColumnIndex);

// if (new File(path).lastModified() >= System.currentTimeMillis() - 10000) {

// if (isScreenshot(path) && !isFromEdit && !(previousPath != null && previousPath.equals(path))) {

// onScreenShot(path, fileName);

// }

// previousPath = path;

// isFromEdit = false;

// } else {

// cursor.close();

// return;

// }

Log.e("take pic", fileName + "----" + path);

}

} catch (Exception e) {

e.printStackTrace();

isFromEdit = true;

} finally {

if (cursor != null) {

cursor.close();

}

}

super.onChange(selfChange, uri);

}

private boolean isScreenshot(String path) {

return path != null && path.toLowerCase().contains("screenshot");

}

protected abstract void onScreenShot(String path, String fileName);

}

public class MainActivity extends AppCompatActivity {

private ScreenShotContentObserver screenShotContentObserver;

private Handler handler = new Handler();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

screenShotContentObserver = new ScreenShotContentObserver(handler, this) {

@Override

protected void onScreenShot(String path, String fileName) {

}

};

}

@Override

public void onResume() {

super.onResume();

getContentResolver().registerContentObserver(

MediaStore.Images.Media.EXTERNAL_CONTENT_URI,

true,

screenShotContentObserver

);

}

@Override

public void onDestroy() {

super.onDestroy();

try {

getContentResolver().unregisterContentObserver(screenShotContentObserver);

} catch (Exception e) {

e.printStackTrace();

}

}

}

三星 华为测试通过：

Screenshot_2018-02-19-07-09-48.jpeg----/storage/emulated/0/Pictures/Screenshots/Screenshot_2018-02-19-07-09-48.jpeg

IMG_20180219_071018.jpg----/storage/emulated/0/DCIM/Camera/IMG_20180219_071018.jpg

源码下载:

http://download.csdn.net/download/fff2666/10194071