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The last article demonstrated SQLite usage, and this article is a hands-on login

viewBinding

Use viewBinding to kill findViewById()

android {
...
buildFeatures {
    viewBinding true}}Copy the code

Login Activity

LoginActivity layout file, there is a FrameLayout, login and registration interface is Fragment


      
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/fragment_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
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Binding for the LoginActivity layout file

private ActivityLoginBinding mBinding;
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Create the layout setContentView(mbinding.getroot ());

public class LoginActivity extends AppCompatActivity {

    private ActivityLoginBinding mBinding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mBinding = ActivityLoginBinding.inflate(getLayoutInflater());
        setContentView(mBinding.getRoot());
    
LoginFragment loginFragment = LoginFragment.newInstance();

     FragmentManager fm = getSupportFragmentManager();
     fm.beginTransaction()
        .add(R.id.fragment_content, loginFragment)
        .commit();

  }
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Logon logic

public class LoginFragment extends Fragment {
    private FragmentLoginBinding mBinding;

    public static LoginFragment newInstance(a) {
        return new LoginFragment();
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        mBinding = FragmentLoginBinding.inflate(inflater, container, false);
        return mBinding.getRoot();
    }
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The registered click event requests the parent layout manager to replace the current page to execute the transaction

mBinding.btnRegister.setOnClickListener(v -> {
    RegisterFragment registerFragment = RegisterFragment.newInstance();
    getParentFragmentManager()
            .beginTransaction()
            //Fragment toggle left and right smooth animation
            .setCustomAnimations(
                    R.anim.slide_in_right,
                    R.anim.slide_out_left,
                    R.anim.slide_in_left,
                    R.anim.slide_out_right
            )
            .add(R.id.fragment_content, registerFragment)
            .addToBackStack(RegisterFragment.TAG)
            .commit();
});
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Let’s assume it’s already registered

Then the login logic determines whether to enter the user name to verify that the password is correct

Administrator Account password

public static final String AdminUserName = "admin";
public static final String AdminUserPassWord = "123456";
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/ / login
mBinding.btnLogin.setOnClickListener(v -> {
    if (checkContent()) {
    // Whether it is an administrator account
        if (userName.equals(Constant.AdminUserName)) {
            if (checkAdminPassWord()) {
               // The administrator password is correct}}else if (checkPassWord()) {
                // The user password is correct}}});Copy the code

** @return */ private Boolean checkContent() {userName = mBinding.etUsernameLayout.getEditText().getText().toString(); passWord = mBinding.etPasswordLayout.getEditText().getText().toString(); If (textutils.isempty (userName)) {showTosat(" userName cannot be empty "); return false; } if (textutils.isempty (userName)) {showTosat(" password cannot be empty "); return false; } return true; }Copy the code

Check whether you are an administrator

Checking the administrator password

private boolean checkAdminPassWord(a) {
    if (userName.equals(Constant.AdminUserName)) {
        if (passWord.equals(Constant.AdminUserPassWord)) {
            return true;
        } else {
            showTosat("Incorrect administrator password");
            return false; }}else {
        return false; }}Copy the code

Then check whether it is a user

Check whether the user name is registered

private boolean checkPassWord(a) {

    UserBean user = userBeanDao.userNameQuery(userName);
    if (user== null) {
        showTosat("User name not registered");
        return false;
    } else {
        if (user.getPassword().equals(passWord)) {
            // Correct password
            return true;
        } else {
            showTosat("Incorrect password");
            // Return false to reenter if incorrect
            return false; }}}Copy the code

Logic of registration

Check whether input is entered

/** * check *@return* /
private boolean checkContent(a){
    initInputData();
    if (TextUtils.isEmpty(userName))){
        showTosat("User name cannot be empty");
        return false;
    }
    if (TextUtils.isEmpty(passWord())){
        showTosat("Password cannot be empty.");
        return false;
    }
    if (TextUtils.isEmpty(phoneNumber))){
        showTosat("Cell phone number cannot be empty.");
        return false;
    }else {
        if(mViewModel.phoneNumber.get().length() ! =11 ) {
            showTosat("Incorrect phone number");
            return false; }}if (TextUtils.isEmpty(str_verification)){
        showTosat("Please enter the verification code.");
        return false;
    }else {
        if (str_verification.equals(verification) ) {
            showTosat("Verification code is not correct");
            return false; }}if(! mViewModel.passWord.get().equals(confirmPassword)){ showTosat("Two different passwords.");
        return false;
    }
    return true;
}
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Check if you have registered

/** * Check if the user name is registered *@return* /
private boolean checkOnly(a){
    List<UserBean> data = userBeanDao.query();
    if (data == null) {return true;
    }
    for (UserBean userBean : data) {
        if (userBean.equals(mViewModel.userName.get())){
            return false; }}return true;
}
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Obtain the verification code based on the mobile phone number

private void getVerification(a){

    if (TextUtils.isEmpty(mBinding.phoneNumberLayout.getEditText().getText().toString())){
        showTosat("Cell phone number cannot be empty.");
        return;
    }
    // Verification code countdown
    CountDownTimerUtils mCountDownTimerUtils = new CountDownTimerUtils( mBinding.btnGetVerification, 60000.1000);
    mCountDownTimerUtils.start();
    showTosat("【"+getString(R.string.app_name)+"Your registration verification code is:"+createVerification()+"Valid for 3 minutes!");
}


private int createVerification(a){
    int max=10000;
    int min=1000;
    Random random = new Random();
    verification =  (random.nextInt(max - min) + min + 1);
    return verification;
}
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Preventing Memory leaks

FragmentDestroyView cleans up memory to prevent memory leaks

@Override
public void onDestroyView(a) {
    super.onDestroyView();
    mBinding = null;
    userBeanDao = null;
}
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private void showTosat(String msg){
    Toast.makeText(getContext(), msg, Toast.LENGTH_LONG).show();
}
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Captcha countdown

/** * @verification code countdown *@Author
 * @TimeAct 2022/2/25 * /
public class CountDownTimerUtils extends CountDownTimer {
    private Button mButton;

    / * * *@param textView          The TextView
     *
     *
     * @param millisInFuture    The number of millis in the future from the call
     *                          to {@link #start()} until the countdown is done and {@link #onFinish()}
     *                          is called.
     * @param countDownInterval The interval along the way to receiver
     *                          {@link #onTick(long)} callbacks.
     */
    public CountDownTimerUtils(Button textView, long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
        this.mButton = textView;
    }

    @Override
    public void onTick(long millisUntilFinished) {
        mButton.setEnabled(false); // The Settings are not clickable
        mButton.setText(millisUntilFinished / 1000 + "Resend in seconds.");  // Set the countdown time


        /** * URLSpan * Text background color BackgroundColorSpan * text color ForegroundColorSpan * Font size AbsoluteSizeSpan * Bold, italic StyleSpan * Strikethrough StrikethroughSpan * underline UnderlineSpan ImageSpan * http://blog.csdn.net/ah200614435/article/details/7914459 * / * image
        SpannableString spannableString = new SpannableString(mButton.getText().toString());  // Get the text on the button
        ForegroundColorSpan span = new ForegroundColorSpan(Color.RED);
        /** * public void setSpan(Object what, int start, int end, int flags) {* * starts at 0. End is the end position, so we're processing text that contains the start position, but not the end position. * /
        spannableString.setSpan(span, 0.2, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);// Set the countdown time to red
        mButton.setText(spannableString);
    }

    @Override
    public void onFinish(a) {
        mButton.setText("Retrieve captcha code");
        mButton.setEnabled(true);// Retrieve the click}}Copy the code

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Implementation of Android SQLite database login registration (ii)

viewBinding

Login Activity

Logon logic

Let’s assume it’s already registered

Administrator Account password

Checking the administrator password

Check whether the user name is registered

Logic of registration

Check if you have registered

Obtain the verification code based on the mobile phone number

Preventing Memory leaks

Captcha countdown

Implementation of Android SQLite database login registration (ii)

viewBinding

Login Activity

Logon logic

Let’s assume it’s already registered

Administrator Account password

Checking the administrator password

Check whether the user name is registered

Logic of registration

Check if you have registered

Obtain the verification code based on the mobile phone number

Preventing Memory leaks

Captcha countdown

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