Question

如果我在我的应用中使用ContentProvider会收到错误，例如＆＃34;不幸的是相机停止了＃34;在Result_ok之后。这是我的代码：

Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                        i.putExtra(MediaStore.EXTRA_OUTPUT, MyFileContentProvider.CONTENT_URI);
 startActivityForResult(i, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);

如何解决这个问题？我不想在SD卡中保存图像。

这是我的MyFileContentProvider类：

public class MyFileContentProvider extends ContentProvider {

    public static final Uri CONTENT_URI = Uri.parse("content://com.example.user.studentadmission/");
    private static final HashMap<String, String> MIME_TYPES = new HashMap<String, String>();
    static {
        MIME_TYPES.put(".jpg", "image/jpeg");
        MIME_TYPES.put(".jpeg", "image/jpeg");
    }
    @Override
    public boolean onCreate() {
        try {
            File mFile = new File(getContext().getFilesDir(), "student.jpg");
            if(!mFile.exists()) {
                mFile.createNewFile();
            }
            getContext().getContentResolver().notifyChange(CONTENT_URI, null);
            return (true);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    @Override
    public String getType(Uri uri) {
        String path = uri.toString();
        for (String extension : MIME_TYPES.keySet()) {
            if (path.endsWith(extension)) {
                return (MIME_TYPES.get(extension));
            }
        }
        return (null);
    }

    @Override
    public ParcelFileDescriptor openFile(Uri uri, String mode)
            throws FileNotFoundException {
        File f = new File(getContext().getFilesDir(), "student.jpg");
        if (f.exists()) {
            return (ParcelFileDescriptor.open(f,
                    ParcelFileDescriptor.MODE_READ_WRITE));
        }
        throw new FileNotFoundException(uri.getPath());
    }

    @Override
    public Cursor query(Uri url, String[] projection, String selection,
                        String[] selectionArgs, String sort) {
        throw new RuntimeException("Operation not supported");
    }

    @Override
    public Uri insert(Uri uri, ContentValues initialValues) {
        throw new RuntimeException("Operation not supported");
    }

    @Override
    public int update(Uri uri, ContentValues values, String where,
                      String[] whereArgs) {
        throw new RuntimeException("Operation not supported");
    }

    @Override
    public int delete(Uri uri, String where, String[] whereArgs) {
        throw new RuntimeException("Operation not supported");
    }

}

Answer 1

很少有相机操作仅适用于Kitkat，请使用条件进行操作：

Intent i = (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT)
                        ? new Intent(MediaStore.ACTION_IMAGE_CAPTURE_SECURE)
                        : new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

i.putExtra(MediaStore.EXTRA_OUTPUT, MyFileContentProvider.CONTENT_URI);
startActivityForResult(i, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);

如果仍然发生崩溃，请尝试避免使用ContentProvider进行测试。让我知道。

Answer 2

授予打开相机的权限。为打开的Camera提供运行时权限。

不幸的是相机停了下来＃34;使用Content Provider时

2 个答案: