广播接收器将不会接收摄像头事件 [英] broadcast receiver won't receive camera event

问题描述

我正在尝试开发一个可检测用户何时拍照的应用程序.我设置了广播接收器类，并通过以下方式将其注册到清单文件中:

I'm trying to make an app that detects when a user takes a photo. I set up a broadcast receiver class and registered it in the manifest file by:

<receiver android:name="photoReceiver" >
  <intent-filter>
    <action android:name="com.android.camera.NEW_PICTURE"/>
      <data android:mimeType="image/*"/>
 </intent-filter>
</receiver>

无论我做什么，该程序都不会收到广播.这是我的接收器类:

No matter what I try to do the program won't receive the broadcast. Here is my receiver class:

public class photoReceiver extends BroadcastReceiver {
  private static final String TAG = "photoReceiver";

@Override
public void onReceive(Context context, Intent intent) {
    CharSequence text = "caught it";
    int duration = Toast.LENGTH_LONG;
    Log.d(TAG, "Received new photo");

    Toast toast = Toast.makeText(context, text, duration);
    toast.show();
 }
}

如果我删除清单中的mimeType行，并且在我的活动中，我将使用发送自己的广播

If I remove the mimeType line in the manifest and in my activity I send my own broadcast using

Intent intent = new Intent("com.android.camera.NEW_PICTURE");
sendBroadcast(intent);

然后我成功接收了广播，并可以看到日志和吐司窗口​​.我是否以正确的方式来对待?我有什么需要补充的吗?

then I successfully receive the broadcast and can see the log and toast window. Am I approaching this the right way? Is there any thing that I need to add?

推荐答案

我通过使用其他方法解决了这个问题.我没有使用广播接收器，而是在相机保存到的单独文件夹中设置了文件观察器.它不像其他方法那样实用，但是仍然可以正常工作.这是我的设置方式:

I solved this but by using a different method. Instead of using a broadcast receiver I set up a fileobserver on separate folders that the camera saved to. It's not as practical as the other way, but it still works fine. Here's how I set it up:

FileObserver observer = new FileObserver(android.os.Environment.getExternalStorageDirectory().toString() + "/DCIM/100MEDIA") { // set up a file observer to watch this directory on sd card
            @Override
        public void onEvent(int event, String file) {
            if(event == FileObserver.CREATE && !file.equals(".probe")){ // check if its a "create" and not equal to .probe because thats created every time camera is launched
                Log.d(TAG, "File created [" + android.os.Environment.getExternalStorageDirectory().toString() + "/DCIM/100MEDIA/" + file + "]");
                fileSaved = "New photo Saved: " + file;
            }
        }
    };
    observer.startWatching(); // start the observer

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