无法通过意图图库保存由Android相机拍摄的图像

Question

我正在尝试构建一个Android应用程序，该应用程序将使用Android相机意图拍摄照片，然后将其保存到图库中。我正在使用移动设备运行该应用程序（API21）。单击“捕获”按钮后，该应用程序正在启动并且相机正在启动。但是当我拍照时，它会显示它的快照，然后应用程序崩溃，并且图像没有保存在图库中。但是，当我导航到“设备文件资源管理器”中的“图片”文件夹时，可以找到其缩略图。有时，如果我重新启动手机，图像会显示在图库中。日志显示NullPointerException错误。

请注意，我也定位可能具有较低API级别的设备。 我们非常感谢您的帮助和支持。

MainActivity.java

public class MainActivity extends AppCompatActivity {

    Button btnCapture, btnCrop, btnAnalyze;
    TextView tvResult;
    ImageView Image;
    final int CAMERA_PIC_REQUEST = 1;  //can be any number
    final int PERMISSION_REQUEST = 2;
    String pathToFile;


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnCapture = findViewById(R.id.btnCapture);
        btnCrop = findViewById(R.id.btnCrop);
        btnAnalyze = findViewById(R.id.btnAnalyze);
        tvResult = findViewById(R.id.tvResult);


        btnCapture.setOnClickListener(new View.OnClickListener() {

            //@RequiresApi(api = Build.VERSION_CODES.M)
            @Override
            public void onClick(View v) {
                takePictureAction();
                            }

        });


    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_REQUEST) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                takePictureAction();
            } else {
                Toast.makeText(this, "Cannot open camera", Toast.LENGTH_LONG).show();
            }
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == CAMERA_PIC_REQUEST) {
                Uri imageUri = data.getData();
                InputStream inputStream;
                try {
                    inputStream = getContentResolver().openInputStream(imageUri); 
                         Bitmap image = BitmapFactory.decodeStream(inputStream);
                    Image.setImageBitmap(image);
                } catch (Exception e) {
                    e.printStackTrace();
                    Toast.makeText(this, "Unable to open image", Toast.LENGTH_LONG).show();
                }

            }
        }
    }


    private void takePictureAction() {
    Uri pictureUri = FileProvider.getUriForFile(this,getApplicationContext().getPackageName() + ".provider", createPhotoFile());
        Intent takepic = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        takepic.putExtra(MediaStore.EXTRA_OUTPUT, pictureUri);
        takepic.setFlags(Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
        startActivityForResult(takepic, CAMERA_PIC_REQUEST);
        Toast.makeText(MainActivity.this, "Camera launched!", Toast.LENGTH_SHORT).show();
        galleryAddPic();
    }


    private File createPhotoFile() {
        String name = new SimpleDateFormat("yyyyMMdd_HH_mm_ss").format(new Date());
        File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        File image = null;

        image = new File(storageDir, "picture" + name + ".jpg");
        pathToFile = image.getAbsolutePath();

        return image;
    }

    private void galleryAddPic() {
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        File f = new File(pathToFile);
        Uri contentUri = Uri.fromFile(f);
        mediaScanIntent.setData(contentUri);
        this.sendBroadcast(mediaScanIntent);
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.omm.mycamera">
    <uses-feature android:name="android.hardware.camera" />
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
        <provider
                android:authorities="com.example.omm.mycamera.provider"
                android:name="android.support.v4.content.FileProvider"
                android:exported="false"
                android:grantUriPermissions="true">
            <meta-data
                    android:name="android.support.FILE_PROVIDER_PATHS"
                    android:resource="@xml/file_paths"></meta-data>
        </provider>

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

    </application>

</manifest>