默認相機應用程序拍攝照片時顯示一條消息

Question

我在想，當用戶使用默認相機應用程序拍攝照片時，我的應用程序是否可以顯示消息？因此，基本上，當用戶打開默認相機應用程序並拍攝照片時，我希望我的應用程序顯示TOAST或消息（並且還可以訪問此圖像）。

有什麼辦法可以做到嗎？

感謝

Answer 1

您可以使用FileObserver象下面這樣： -

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 

您還可以使用CameraEventReciver： -

創建一個接收器你的代碼說CameraEventReciver，你可以實現你的代碼，如： -

public class CameraEventReciver extends BroadcastReceiver { 

@Override 
public void onReceive(Context context, Intent intent) { 

    Cursor cursor = context.getContentResolver().query(intent.getData(),  null,null, null, null); 
    cursor.moveToFirst(); 
    String image_path = cursor.getString(cursor.getColumnIndex("_data")); 
    Toast.makeText(context, "New Photo is Saved as : -" + image_path, 1000).show(); 
     } 
    } 

而在Android清單你必須要採取一些權限，並註冊意圖過濾並採取適當行動的圖像捕獲你的reciever也使能喜歡你的接收器的android： -

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

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

更多信息，採取一看： -

broadcast receiver won't receive camera event

這可能會幫助你。

Answer 2

嘗試使用此。

// method to take picture from camera 
protected void takepicture() { 
    // TODO Auto-generated method stub 

    String fileName = "temp.jpg"; 
    ContentValues values = new ContentValues(); 
    values.put(MediaStore.Images.Media.TITLE, fileName); 
    mCapturedImageURI = getContentResolver().insert(
      MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); 

    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
    intent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI); 
    values.clear(); 
    startActivityForResult(intent, 5); 
} 

和activiyt結果：

// on activity result we store captures image in images 
@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    // TODO Auto-generated method stub 
    super.onActivityResult(requestCode, resultCode, data); 
    if (resultCode == RESULT_OK) { 
     if (requestCode == 5) { 

      String[] projection = { MediaStore.Images.Media.DATA }; 
      @SuppressWarnings("deprecation") 
      Cursor cursor = managedQuery(mCapturedImageURI, projection, 
        null, null, null); 
      int column_index_data = cursor 
        .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
      cursor.moveToFirst(); 
      image_path = cursor.getString(column_index_data); 
      Log.e("path of image from CAMERA......******************.........", 
        image_path + ""); 
      // bitmap = BitmapFactory.decodeFile(image_path); 
      BitmapFactory.Options options = new BitmapFactory.Options(); 
      options.inSampleSize = 8; 
      bitmap = BitmapFactory.decodeFile(image_path, options); 
         Toast.makeText(getApplicationcontext, "photo taken", 1000) 
       .show(); 




     } 

    }