安卓 : How to write camera intent in android nougat

Question

在我的 android 应用程序中，我必须在单击按钮时使用相机拍摄图像。它在除 Android 7 (Nougat) 以外的所有 Android 版本中都能完美运行。当我选择相机选项时，即使授予了权限，应用程序也会退出。我认为问题出在调用相机的 Intent 中。下面是我的代码。

camera = (ImageView) dialog.findViewById(R.id.camera);

camera.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        clickCamera();
        dialog.dismiss();
    }
});

private void clickCamera() { // 1 for icon and 2 for attachment
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(MainActivity.this, new String[] { Manifest.permission.CAMERA }, MY_REQUEST_CODE);
    } else {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(MainActivity.this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, MY_REQUEST_CODE_STORAGE);
        } else {
            currentImageUri = getImageFileUri();
            Intent intentPicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            intentPicture.putExtra(MediaStore.EXTRA_OUTPUT, currentImageUri); // set the image file name
            // start the image capture Intent
            startActivityForResult(intentPicture, REQUEST_CAMERA);  // 1 for REQUEST_CAMERA (icon) and 2 for REQUEST_CAMERA_ATT (attachment)
        }
    }
}

private static Uri getImageFileUri(){
    // Create a storage directory for the images
    // To be safe(r), you should check that the SD card is mounted
    // using Environment.getExternalStorageState() before doing this

    imagePath = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyProject");
    if (!imagePath.exists()) {
        if (!imagePath.mkdirs()) {
            return null;
        } else {
            // create new folder
        }
    }

    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File image = new File(imagePath, "MyProject_" + timeStamp + ".jpg");

    if (!image.exists()) {
        try {
            image.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    // Create an File Uri
    return Uri.fromFile(image);
}


@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_REQUEST_CODE: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // permission was granted, yay! Do the
                // contacts-related task you need to do.
                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, MY_REQUEST_CODE_STORAGE);
                } else {
                    currentImageUri = getImageFileUri();
                    Intent intentPicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    intentPicture.putExtra(MediaStore.EXTRA_OUTPUT, currentImageUri); // set the image file name
                    // start the image capture Intent
                    startActivityForResult(intentPicture, REQUEST_CAMERA);
                }
            } else {
                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(this, "Doesn't have permission... ", Toast.LENGTH_SHORT).show();
            }
            return;
        }
        case MY_REQUEST_CODE_STORAGE: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                currentImageUri = getImageFileUri();
                Intent intentPicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intentPicture.putExtra(MediaStore.EXTRA_OUTPUT, currentImageUri); // set the image file name
                // start the image capture Intent
                startActivityForResult(intentPicture, REQUEST_CAMERA);
            } else {
                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(this, "Doesn't have permission...", Toast.LENGTH_SHORT).show();
            }
            return;
        }
    }
}

Nougat 的问题是什么？是因为getImageFileUri()返回的Uri吗？

Answer 1

嘿，请关注 this thread作为引用。当您将 targetSDK 设置为 24 并更改以下内容时，它将向您展示如何使用 File Provider。在您的 private static Uri getImageFileUri() 方法中

改变这一行

return Uri.fromFile(image);

到

FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".provider", createImageFile());

希望本文能帮助您解决问题。
更多信息请访问 - Setting Up File Sharing - Offical documentation