Android:如何在 android nougat 中编写相机意图 [英] Android : How to write camera intent in android nougat

问题描述

在我的 android 应用程序中，当单击按钮时，我必须使用相机拍摄图像.它在除 Android 7 (Nougat) 之外的所有 Android 版本中都能完美运行.当我选择相机选项时，即使授予权限，应用程序也会退出.我认为问题出在相机调用意图中.下面是我的代码.

In my android application I have to take images using the camera when a button is clicked. It is working perfectly in all Android versions except Android 7 (Nougat). When I choose the camera option, the app is exiting even if the permissions are granted. I think the problem is in the camera-calling Intent. Below is my code.

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;
        }
    }
}

牛轧糖的问题是什么?是不是因为getImageFileUri()返回的Uri?

What is the problem here for Nougat? Is it because of the Uri returned by getImageFileUri()?

推荐答案

你好，请关注这个帖子作为参考.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

Hey please follow this thread as a reference. It will show you how to use File Provider when you set your targetSDK as 24 and change following. In your private static Uri getImageFileUri() method

改变这一行

return Uri.fromFile(image);

到

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

希望这将帮助您解决问题.
更多信息请访问 -设置文件共享 - 官方文档

Hope this will help you to solve your issue.
For more go to - Setting Up File Sharing - Offical documentation

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