昨天学习了sharedpreference的相关用法
遇到的困难是:在sharepreference中存储数据不熟练
今天准备继续学习如何实现自动登录功能
package com.example.a002034.autologindemo; import android.annotation.SuppressLint; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.Window; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.EditText; import android.widget.ImageButton; import android.widget.Toast; /** * @author 002034 */ public class LoginActivity extends AppCompatActivity implements View.OnClickListener, CompoundButton.OnCheckedChangeListener { private static final String TAG = "LoginActivity"; private EditText mUserName, mPassword; private CheckBox mCbPwd, mCbAutoLogin; private Button mBtnLogin; private ImageButton mBtnQuit; private String mUserNameValue, mPasswordValue; private SharedPreferences sp; @SuppressLint("WorldReadableFiles") @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //去除标题 this.requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_login); //获得实例对象 sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE); mUserName = findViewById(R.id.et_zh); mPassword = findViewById(R.id.et_mima); mCbPwd = findViewById(R.id.cb_mima); mCbAutoLogin = findViewById(R.id.cb_auto); mCbPwd.setOnCheckedChangeListener(this); mCbAutoLogin.setOnCheckedChangeListener(this); mBtnLogin = findViewById(R.id.btn_login); mBtnQuit = findViewById(R.id.img_btn); mBtnLogin.setOnClickListener(this); mBtnQuit.setOnClickListener(this); //检查初始状态 checkInitStatus(sp); } /** * 检查记住密码. */ private void checkRemPwd() { if (mCbPwd.isChecked()) { Log.i(TAG, "checkRemPwd:记住密码已选中 "); sp.edit().putBoolean("ISCHECK", true).apply(); } else { Log.i(TAG, "checkRemPwd: 记住密码没有选中"); sp.edit().putBoolean("ISCHECK", false).apply(); } } /** * 初始检查记住密码状态以及是否设置自动登录. */ private void checkInitStatus(SharedPreferences sp) { if (sp.getBoolean("ISCHECK", false)) { //设置默认是记录密码状态 mCbPwd.setChecked(true); mUserName.setText(sp.getString("USER_NAME", "")); mPassword.setText(sp.getString("PASSWORD", "")); //判断自动登陆多选框状态 if (sp.getBoolean("AUTO_ISCHECK", false)) { //设置默认是自动登录状态 mCbAutoLogin.setChecked(true); //跳转界面 Intent intent = new Intent(LoginActivity.this, LogoActivity.class); LoginActivity.this.startActivity(intent); } } } /** * 登录. */ private void login() { mUserNameValue = mUserName.getText().toString(); mPasswordValue = mPassword.getText().toString(); if ("xzy".equals(mUserNameValue) && "123".equals(mPasswordValue)) { Toast.makeText(LoginActivity.this, "登录成功", Toast.LENGTH_SHORT).show(); //登录成功和记住密码框为选中状态才保存用户信息 if (mCbPwd.isChecked()) { //记住用户名、密码、 SharedPreferences.Editor editor = sp.edit(); editor.putString("USER_NAME", mUserNameValue); editor.putString("PASSWORD", mPasswordValue); editor.apply(); } //跳转界面 Intent intent = new Intent(LoginActivity.this, LogoActivity.class); LoginActivity.this.startActivity(intent); } else { Toast.makeText(LoginActivity.this, "用户名或密码错误,请重新登录", Toast.LENGTH_LONG).show(); } } /** * 检查自动登录. */ private void checkAutoLogin() { if (mCbAutoLogin.isChecked()) { System.out.println("自动登录已选中"); sp.edit().putBoolean("AUTO_ISCHECK", true).apply(); } else { System.out.println("自动登录没有选中"); sp.edit().putBoolean("AUTO_ISCHECK", false).apply(); } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.img_btn: finish(); break; // 登录监听事件 现在默认为用户名为:xzy 密码:123 case R.id.btn_login: login(); break; default: break; } } @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { switch (buttonView.getId()) { //监听自动登录多选框事件 case R.id.cb_auto: checkAutoLogin(); break; //监听记住密码 case R.id.cb_mima: checkRemPwd(); break; default: break; } } }