Android -- Camera Intent 立即返回

Question

我有一个 Activity 允许用户选择预览他们从图库或相机中选择的照片。我遇到的问题是相机/画廊 intent 立即返回，然后显示相机/画廊并且不返回任何内容。

事情的基本流程如下:Fragment -> Application Subclass -> Top Activity -(startActivity) -> Photo Preview Activity -(in onCreate) -> Photo Chooser Intent

---

//In the application subclass
public static void launchImageSelector()
{
    if(!(topActivity instanceof ImagePreviewActivity))
    {
        Intent i = new Intent(context, ImagePreviewActivity.class);
        topActivity.startActivityForResult(i, kImageSelectorRequestCode);
    }
}

---

///in ImagePreviewActivity class
@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);

    Intent chooser = createChooserIntent(createCameraIntent());
    chooser.putExtra(Intent.EXTRA_INTENT, createOpenableIntent("image/*"));
    startActivityForResult(chooser, 1);
}

//intent creaters(from android src)
private Intent createChooserIntent(Intent... intents)
{
    Intent chooser = new Intent(Intent.ACTION_CHOOSER);
    chooser.putExtra(Intent.EXTRA_INITIAL_INTENTS, intents);
    chooser.putExtra(Intent.EXTRA_TITLE, "Choose Photo");
    return chooser;
}

private Intent createOpenableIntent(String type) 
{
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
//      i.addCategory(Intent.CATEGORY_OPENABLE);
    i.setType(type);
    return i;
}

private Intent createCameraIntent() 
{
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    File externalDataDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_DCIM);
    File cameraDataDir = new File(externalDataDir.getAbsolutePath() +
            File.separator + "browser-photos");
    cameraDataDir.mkdirs();
    String mCameraFilePath = cameraDataDir.getAbsolutePath() + File.separator +
            System.currentTimeMillis() + ".jpg";

    photoFileUri = Uri.fromFile(new File(mCameraFilePath));

    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoFileUri);

    return cameraIntent;
}

---

我在这里做错了什么？什么会导致 Chooser Intent 立即返回但又继续？我在这里做错了什么吗？

感谢您的帮助!

Answer 1

经过几个小时的调试，问题出在 list 文件中。在 android 中，如果启动模式设置为 singleInstance 或 singleTop，则无法为结果启动 Activity

在这里找到答案:Android - startActivityForResult immediately triggering onActivityResult