android中图像视图的登录验证

Question

验证:登录表单:我可以验证电子邮件:如果有错误，它不应该转到下一页。

但是，有一个领域。图像视图。我从画廊里挑选了一张图片，并将其设置为图像视图。也不存在任何问题。

当Imageview中没有图像时，应该会出现错误，因为没有图像，这就像电子邮件验证一样。如何像登录验证一样验证Imageview

不应该移到下一页..。

..How是可能的。有什么帮助吗？谢谢已经提前了。我可以用下面的代码成功地验证，比如我想要的Imageview。

enter code here


public class MainActivity extends AppCompatActivity 
  implements View.OnClickListener {

//The view objects
private EditText editTextName, editTextEmail, editTextMobile,
        editTextDob, editTextAge;

private Button buttonSubmit;

//defining AwesomeValidation object
private AwesomeValidation awesomeValidation;

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

    //initializing awesomevalidation object
    /*        awesomeValidation.addValidation(this, R.id.editTextName, "^[A-Za-z\\s]{1,}[\\.]{0,1}[A-Za-z\\s]{0,}$", R.string.nameerror);

    * The library provides 3 types of validation
    * BASIC
    * COLORATION
    * UNDERLABEL
    * */
    awesomeValidation = new AwesomeValidation(ValidationStyle.BASIC);

    //initializing view objects
    editTextName = (EditText) findViewById(R.id.editTextName);
    editTextEmail = (EditText) findViewById(R.id.editTextEmail);
    editTextMobile = (EditText) findViewById(R.id.editTextMobile);
    editTextDob = (EditText) findViewById(R.id.editTextDob);
    editTextAge = (EditText) findViewById(R.id.editTextAge);

    buttonSubmit = (Button) findViewById(R.id.buttonSubmit);


    //adding validation to edittexts
    awesomeValidation.addValidation(this, R.id.editTextEmail, Patterns.EMAIL_ADDRESS, R.string.nameerror);
    awesomeValidation.addValidation(this, R.id.editTextMobile, "^[2-9]{2}[0-9]{8}$", R.string.nameerror);
    awesomeValidation.addValidation(this, R.id.editTextDob, "^(?:(?:31(\\/|-|\\.)(?:0?[13578]|1[02]))\\1|(?:(?:29|30)(\\/|-|\\.)(?:0?[1,3-9]|1[0-2])\\2))(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$|^(?:29(\\/|-|\\.)0?2\\3(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\\d|2[0-8])(\\/|-|\\.)(?:(?:0?[1-9])|(?:1[0-2]))\\4(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$", R.string.nameerror);
    awesomeValidation.addValidation(this, R.id.editTextAge, Range.closed(13, 60), R.string.ageerror);

    buttonSubmit.setOnClickListener(this);
}

private void submitForm() {
    //first validate the form then move ahead
    //if this becomes true that means validation is successfull
    if (awesomeValidation.validate()) {
        Toast.makeText(this, "Validation Successfull", Toast.LENGTH_LONG).show();
        //process the data further
    }
}

@Override
public void onClick(View view) {
    if (view == buttonSubmit) {
        submitForm();
    }
}
}

Answer 1

1.您可以在onActivityResult()中检查是否选中了图像

因此，只需重写()即可。

3.在数据中，如果您选择了图像，那么它将具有图像的路径，否则它将为空。

注意:我使用了幻灯片库来显示图像。(这部分是可选的)所以只需在build.gradle(Module )中添加它

编译‘com.github.Bangptech.glide:glide:3.7.0’

   Uri filePath;// class variable

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (data != null) {
            // set selected image in image view
            filePath = data.getData();
            Glide.with(MainActivity.this).load(filePath).into(imafeView);
        } else {
            // set default or any error image in image view
            Glide.with(MainActivity.this).load(R.drawable.err_image_name).into(imafeView);
            Log.e(TAG, "nothing Selected: ");
        }
    }

Answer 2

取一个布尔标志，并将其设置为默认false

boolean isImageAdded = false;

现在从相机或库中选择图像，如果您的图像数据在onActivityResult方法中不为空，则生成isImageAdded = true。

最后，为了验证，只需检查isImageAdded是正确的还是错误的。

Answer 3

您可以遵循以下代码：

开放画廊：

private void openGallery() {
        Intent pOpenGalleryIntent = new Intent();
        pOpenGalleryIntent.setType("image/*");
        pOpenGalleryIntent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(pOpenGalleryIntent, getString(R.string.app_name)),1);
    }

OnActivityResult()：

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        Uri pSelectedImageUri = null;
        if (resultCode == RESULT_OK) {
            if (requestCode == 1) {
                pSelectedImageUri = data.getData();
                //Set imageView

            }

    } else {
         //Validation fail
    }
}