pocketcommunityclient/app/src/main/java/com/community/pocket/ui/login/LoginActivity.java

package com.community.pocket.ui.login;

import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;

import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;

import com.community.pocket.R;
import com.community.pocket.ui.BaseActivity;
import com.community.pocket.ui.listener.MyTextChange;
import com.community.pocket.ui.main.MainMenu;
import com.community.pocket.ui.main.ui.share.Response;
import com.community.pocket.ui.register.RegisterActivity;
import com.community.pocket.ui.resetpwd.ResetPwdActivity;
import com.community.pocket.util.PropertiesUtil;

import org.xutils.view.annotation.ContentView;
import org.xutils.view.annotation.Event;
import org.xutils.view.annotation.ViewInject;

/**
 * 登陆
 */

@ContentView(R.layout.activity_login)
public class LoginActivity extends BaseActivity {

    private LoginViewModel loginViewModel;

    //用户名
    @ViewInject(R.id.username)
    private EditText usernameEditText;

    //密码
    @ViewInject(R.id.password)
    private EditText passwordEditText;

    //登录按钮
    @ViewInject(R.id.login)
    private Button loginButton;

    //进度条
    @ViewInject(R.id.loading)
    private ProgressBar loadingProgressBar;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        loginViewModel = new ViewModelProvider(this, new ViewModelProvider.NewInstanceFactory()).get(LoginViewModel.class);

        //监听数据校验状态
        loginViewModel.getLoginFormState().observe(this, new Observer<LoginFormState>() {
            @Override
            public void onChanged(@Nullable LoginFormState loginFormState) {
                if (loginFormState == null) {
                    return;
                }
                loginButton.setEnabled(loginFormState.isDataValid());
                if (loginFormState.getUsernameError() != null) {
                    usernameEditText.setError(getString(loginFormState.getUsernameError(), PropertiesUtil.getIntValue("username.length")));
                }
                if (loginFormState.getPasswordError() != null) {
                    passwordEditText.setError(getString(loginFormState.getPasswordError(), PropertiesUtil.getIntValue("password.length")));
                }
            }
        });

        //监听登陆请求结果
        loginViewModel.getLoginResult().observe(this, new Observer<LoginResponse>() {
            @Override
            public void onChanged(@Nullable LoginResponse loginResponse) {
                if (loginResponse == null) {
                    return;
                }
                loadingProgressBar.setVisibility(View.GONE);
                setResult(Activity.RESULT_OK);

                loginResponse.toast(getBaseContext());
                if (loginResponse.getResult() == Response.Result.OK) {
                    startActivity(new Intent(getBaseContext(), MainMenu.class));
                    //Complete and destroy login activity once successful
                    finish();
                }
            }
        });


//        监听用户密码文本输入框内容改变
        TextWatcher afterTextChangedListener = new MyTextChange() {
            @Override
            public void afterTextChanged(Editable s) {
                loginViewModel.loginDataChanged(usernameEditText.getText().toString(),
                        passwordEditText.getText().toString());
            }
        };

        //添加监听器到组件
        usernameEditText.addTextChangedListener(afterTextChangedListener);
        passwordEditText.addTextChangedListener(afterTextChangedListener);
    }

    //登录按钮触发登录请求操作
    @RequiresApi(api = Build.VERSION_CODES.N)
    @Event(value = R.id.login)
    private void login(View v) {
        //显示登录请求处理进度
        loadingProgressBar.setVisibility(View.VISIBLE);
        loginViewModel.login(usernameEditText.getText().toString(),
                passwordEditText.getText().toString());
    }

    @Event(value = R.id.register)
    private void register(View v) {
        startActivity(new Intent(this, RegisterActivity.class));
    }


    @Event(value = R.id.login_to_resetPwd)
    private void resetRwd(View v) {
        startActivity(new Intent(this, ResetPwdActivity.class));
    }

}