如何使用相机拍摄新图像并将其存储在外部存储器中？

Question

我正在尝试使用相机拍摄新图像，然后将其存储在外部存储器中。

我遵循了这个教程Save the full-size photo and this Add the photo to a gallery但是在运行应用程序之后，相机启动并成功捕获了图像，但是当我去画廊时，找不到通过以下方式捕获的图像相机！

//I changed this from com.example.android.fileprovider to com.test.app.fileprovider
android:authorities="com.test.app.fileprovider"

//I changed this line Uri photoURI = FileProvider.getUriForFile(this, "com.example.android.fileprovider", photoFile); to below code
Uri photoURI = FileProvider.getUriForFile(this, "com.test.app.fileprovider", photoFile);

//I added this permission
<uses-permission android:name="android.permission.CAMERA" />

//I enabled storage permission read and write
//I tested the codes on API 24
//minSdkVersion 21

清单

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test.app">

    <uses-feature android:name="android.hardware.camera"
        android:required="true" />

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission
        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        android:maxSdkVersion="18" />

    <application>

        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="com.test.app.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>

    </application>

</manifest>

file_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-files-path name="my_images" path="Pictures" />
</paths>

MainActivity

public class MainActivity extends AppCompatActivity {

    String currentPhotoPath;
    int REQUEST_IMAGE_CAPTURE = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        SplashScreen.installSplashScreen(this);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        dispatchTakePictureIntent();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable @org.jetbrains.annotations.Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_IMAGE_CAPTURE) {
            Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
            File f = new File(currentPhotoPath);
            Uri contentUri = Uri.fromFile(f);
            mediaScanIntent.setData(contentUri);
            this.sendBroadcast(mediaScanIntent);
        }
    }

    private void dispatchTakePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // Ensure that there's a camera activity to handle the intent
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            // Create the File where the photo should go
            File photoFile = null;
            try {
                photoFile = createImageFile();
            } catch (IOException ex) {
                // Error occurred while creating the File

            }
            // Continue only if the File was successfully created
            if (photoFile != null) {
                Uri photoURI = FileProvider.getUriForFile(this,
                        "com.test.app.fileprovider",
                        photoFile);
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
            }
        }
    }

    private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );

        // Save a file: path for use with ACTION_VIEW intents
        currentPhotoPath = image.getAbsolutePath();
        return image;
    }

}

附加问题：本教程与本教程有何不同Save the full-size photo and this tutorial Add the photo to a gallery？

如果我达到50分，最佳答案将从这个账户中抽取+50 bounty，否则，我将在2天后从我的其他账户中获得赏金。

Answer 1

您的文件不会被 MediaStore 扫描，因此不会在图库应用程序中显示，因为图库应用程序主要从 MediaStore 获取信息。

getExternalFilesDir() 是您的应用程序的私有位置，MediaStore 尊重这一点。

How can I capture a new image using the camera and after that store it in the external storage?

错误的问题描述。

相机应用拍完照片后，相机应用会将照片保存到文件提供商指定的文件中。那就没什么可做的了。

因此，在启动相机之前，甚至在使用 FileProvider 之前，您应该已经为您的文件确定了一个合适的位置，并为该文件构建了一个很好的 uri。

您至少有两个选择。

使用 MediaStore 获取 public DCIM 或图片目录中文件的 uri。

将 getExternalStoragePublicDirectory() 与 FileProvider 一起使用以获取同一 public 目录中文件的 uri。

如何使用相机拍摄新图像并将其存储在外部存储器中？

How can I capture a new image using the camera and after that store it in the external storage?

android

android-camera

android-external-storage

android-storage