启动相机导致Android崩溃

Question

我遵循了这个简单的应用程序AndroidScannerDemo ，它有两个主要按钮打开相机和打开画廊。 相机在我的手机 API 19 上运行良好，但是当我尝试在其他设备或模拟器上启动相机时，应用程序崩溃。

据我所知，这可能是由于许可

编辑：显然这也是前一段时间在这里问过的，但问题仍然存在

错误更新：来自createImageFile方法的根本问题

我尝试改变//cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, tempFileUri); 到

cameraIntent.putExtra(ScanConstants.OPEN_INTENT_PREFERENCE, preference);

我可以启动相机，但拍照后立即崩溃

更新 2 ：我正在尝试按照本文提供的答案在我使用片段的唯一问题下方

那么如何更改这一行tempFileUri = FileProvider.getUriForFile(getActivity().getApplicationContext(), "com.scanlibrary.provider", // As defined in Manifest file);

到tempFileUri = FileProvider.getUriForFile(PickImageFragment.this, getString(R.string.file_provider_authority), file); 在一个片段里面！

错误的第一个参数 PickImageFragment

编辑：更改了 PickImageFragment 内的 openCamera() 方法

我错过了什么？

堆栈跟踪

2019-11-29 23:45:05.750 27993-27993/com.nabeeltech.capturedoc E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.nabeeltech.capturedoc, PID: 27993
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nabeeltech.capturedoc/com.scanlibrary.ScanActivity}: java.lang.SecurityException: UID 10091 does not have permission to content://com.scanlibrary.provider/external_files/scanSample/IMG_20191129_224505.jpg [user 0]
 Caused by: java.lang.SecurityException: UID 10091 does not have permission to content://com.scanlibrary.provider/external_files/scanSample/IMG_20191129_224505.jpg [user 0]
    at com.scanlibrary.PickImageFragment.openCamera(PickImageFragment.java:131)
    at com.scanlibrary.PickImageFragment.handleIntentPreference(PickImageFragment.java:79)
    at com.scanlibrary.PickImageFragment.init(PickImageFragment.java:60)
    at com.scanlibrary.PickImageFragment.onCreateView(PickImageFragment.java:50)

选择图像片段

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    view = inflater.inflate(R.layout.pick_image_fragment, null);
    init();
    return view;
}

private void init() {
    cameraButton = (ImageButton) view.findViewById(R.id.cameraButton);
    cameraButton.setOnClickListener(new CameraButtonClickListener());
    galleryButton = (ImageButton)
 view.findViewById(R.id.selectButton);
    galleryButton.setOnClickListener(new GalleryClickListener());
    if (isIntentPreferenceSet()) {
        handleIntentPreference();
    } else {
        getActivity().finish();
    }
}

private void handleIntentPreference() {
    int preference = getIntentPreference();
    if (preference == ScanConstants.OPEN_CAMERA) {
        openCamera();
    } else if (preference == ScanConstants.OPEN_MEDIA) {
        openMediaContent();
    }
}

public void openCamera() {
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    Uri tempFileUri = null;
        File file = createImageFile();
        boolean isDirectoryCreated = file.getParentFile().mkdirs();
        Log.d("", "openCamera: isDirectoryCreated: " + isDirectoryCreated);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        tempFileUri = FileProvider.getUriForFile(getActivity().getApplicationContext(),
                "com.scanlibrary.provider", // As defined in Manifest
                file);
        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, tempFileUri);
    } else {
        tempFileUri = Uri.fromFile(file);
        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, tempFileUri);
    }
    if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP) {
        cameraIntent.setClipData(ClipData.newRawUri("", tempFileUri));
        cameraIntent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
    }
    startActivityForResult(cameraIntent, ScanConstants.START_CAMERA_REQUEST_CODE);

private File createImageFile() {
    clearTempImages();
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new
            Date());
    File file = new File(ScanConstants.IMAGE_PATH, "IMG_" + timeStamp +
            ".jpg");
    fileUri = Uri.fromFile(file);
    return file;
}

private void clearTempImages() {
    try {
        File tempFolder = new File(ScanConstants.IMAGE_PATH);
        for (File f : tempFolder.listFiles())
            f.delete();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

扫描常数

public class ScanConstants {

public final static int PICKFILE_REQUEST_CODE = 1;
public final static int START_CAMERA_REQUEST_CODE = 2;
public final static String OPEN_INTENT_PREFERENCE = "selectContent";
public final static String IMAGE_BASE_PATH_EXTRA = "ImageBasePath";
public final static int OPEN_CAMERA = 4;
public final static int OPEN_MEDIA = 5;
public final static String SCANNED_RESULT = "scannedResult";
public final static String IMAGE_PATH = Environment
        .getExternalStorageDirectory().getPath() + "/scanSample";

public final static String SELECTED_BITMAP = "selectedBitmap";
}

Answer 1

您已经编写了很好的代码Fileprovider.getUriforFile ，但是您是否声明了所需的权限。

解决这个问题的唯一方法是向所有可能需要它的包授予权限，如下所示：

List<ResolveInfo> resInfoList = context.getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
for (ResolveInfo resolveInfo : resInfoList) {
    String packageName = resolveInfo.activityInfo.packageName;
    context.grantUriPermission(packageName, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);
}

如果以上没有解决问题，我建议参考 Lorenzo Quiroli 的这篇文章，该文章为旧版 Android 解决了这个问题。

他发现需要手动设置Intent的ClipData并ClipData设置权限，像这样：

if ( Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP ) {
    takePictureIntent.setClipData( ClipData.newRawUri( "", photoURI ) );
    takePictureIntent.addFlags( Intent.FLAG_GRANT_WRITE_URI_PERMISSION|Intent.FLAG_GRANT_READ_URI_PERMISSION );
}