java - Android从捕获的图像中获取图像路径

Question

我在尝试从捕获的图像获取图像路径时遇到一些问题。当我的相机按钮点击时:

takePickBtn.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            Intent cameraIntent = new Intent(
                    android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(Intent.createChooser(cameraIntent, "Select Picture"), REQUEST_IMAGE_CAPTURE);
        }
    });

然后是我尝试将捕获的图像加载到 ImageView 并获取字符串以将其传递给异步 Http Post 的代码:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    try {
        // When an Image is picked
        if (requestCode == REQUEST_IMAGE_CAPTURE
                && resultCode == RESULT_OK) {               
            final ContentResolver cr = getContentResolver();
            final String[] p1 = new String[] {
                MediaStore.Images.ImageColumns._ID,
                MediaStore.Images.ImageColumns.DATE_TAKEN
                    };
            Cursor c1 = cr.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, p1, null, null, p1[1] + " DESC");
            if ( c1.moveToFirst() ) {
            String uristringpic = "content://media/external/images/media/" +c1.getInt(0);
             Uri uri = Uri.parse(uristringpic);
                try {
                  Bitmap bm = android.provider.MediaStore.Images.Media.getBitmap(cr, uri);
                } finally {

                }
                params.put("filename", uristringpic);
            }
        } else {
            Toast.makeText(this, "You haven't picked Image",
                    Toast.LENGTH_LONG).show();
        }
    } catch (Exception e) {
        Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG)
                .show();
    }

}

但是，通过执行此操作，捕获的图像已设置为 ImageView 。但是当我尝试打印 uristringpic 时，它是空的。有什么想法吗？

提前致谢。

Answer 1

也许你应该尝试这样的事情

Uri photoUri;

takePickBtn.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            Intent cameraIntent = new Intent(
                    android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            photoUri = context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new ContentValues());
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
            startActivityForResult(Intent.createChooser(cameraIntent, "Select Picture"), REQUEST_IMAGE_CAPTURE);
        }
    });

现在，拍摄图像后，photoUri var 中就有了图像 uri。

如果您需要真实路径，只需使用

public static String getPathFromMediaUri(@NonNull Context context, @NonNull Uri contentUri) {
    Cursor cursor = null;
    try {
        String[] proj = {MediaStore.Images.Media.DATA};
        cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
}