Android 实现登录界面 记住账号密码等功能
先看代码：
布局文件
package com.farsight.bookstore;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
/**
* 登录界面
*
* @author Administrator
*
*/
public class LoginActivity extends Activity implements OnClickListener {
private EditText etUerName;
private EditText etPassWord;
private Button buLogin;
private Button buExit;
private CheckBox cbSavePassword;
private CheckBox cbLogin;
private String userName;
private String passWord;
private SharedPreferences sp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
initView();
buLogin.setOnClickListener(this);
buExit.setOnClickListener(this);
cbSavePassword.setOnClickListener(this);
cbLogin.setOnClickListener(this);
// 显示 保存的账号密码
if (sp.getString("username", "") != null
&& sp.getString("password", "") != null
&& sp.getBoolean("isChecked", false)) {
etUerName.setText(sp.getString("username", ""));
etPassWord.setText(sp.getString("password", ""));
cbSavePassword.setChecked(true);
}
}
/**
* 初始化界面ID
*/
private void initView() {
etUerName = (EditText) findViewById(R.id.edittext_username);
etPassWord = (EditText) findViewById(R.id.edittext_password);
buLogin = (Button) findViewById(R.id.button_login);
buExit = (Button) findViewById(R.id.button_exit);
cbSavePassword = (CheckBox) findViewById(R.id.checkBox_savePassword);
cbLogin = (CheckBox) findViewById(R.id.checkBox_login);
sp = getSharedPreferences("config", MODE_PRIVATE);
}
@Override
public void onClick(View v) {
userName = etUerName.getText().toString().trim();
passWord = etPassWord.getText().toString().trim();
Log.i("main", "username" + userName);
Log.i("main", "password" + passWord);
switch (v.getId()) {
case R.id.button_login:
if (isScuess(userName, passWord)) {
// 当账号密码正确时 保存正确的信息
sp.edit().putString("username", userName).commit();
sp.edit().putString("password", passWord).commit();
goHomePager();// 跳到主页面
} else {
Toast.makeText(this, "账号或密码错误！", Toast.LENGTH_SHORT).show();
}
break;
case R.id.button_exit:
System.exit(0);
break;
case R.id.checkBox_login:
break;
case R.id.checkBox_savePassword:
if (cbSavePassword.isChecked()) {
sp.edit().putBoolean("isChecked", true).commit(); // 提交checkBox
// 点击
} else {
sp.edit().putBoolean("isChecked", false).commit(); // 提交checkBox
// 点击
}
break;
}
}
/**
* 跳转到主页面
*/
private void goHomePager() {
Intent intent = new Intent(this, HomeActivity.class);
startActivity(intent);
}
/**
* 判断账号密码是否 符合
*/
private boolean isScuess(String user, String password) {
if (user.equals("admin") && password.equals("admin")) {
Log.i("main", "成功");
return true;
}
return false;
}
}
登录代码： package com.farsight.bookstore;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
/**
* 登录界面
*
* @author Administrator
*
*/
public class LoginActivity extends Activity implements OnClickListener {
private EditText etUerName;
private EditText etPassWord;
private Button buLogin;
private Button buExit;
private CheckBox cbSavePassword;
private CheckBox cbLogin;
private String userName;
private String passWord;
private SharedPreferences sp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
initView();
buLogin.setOnClickListener(this);
buExit.setOnClickListener(this);
cbSavePassword.setOnClickListener(this);
cbLogin.setOnClickListener(this);
// 显示 保存的账号密码
if (sp.getString("username", "") != null
&& sp.getString("password", "") != null
&& sp.getBoolean("isChecked", false)) {
etUerName.setText(sp.getString("username", ""));
etPassWord.setText(sp.getString("password", ""));
cbSavePassword.setChecked(true);
}
}
/**
* 初始化界面ID
*/
private void initView() {
etUerName = (EditText) findViewById(R.id.edittext_username);
etPassWord = (EditText) findViewById(R.id.edittext_password);
buLogin = (Button) findViewById(R.id.button_login);
buExit = (Button) findViewById(R.id.button_exit);
cbSavePassword = (CheckBox) findViewById(R.id.checkBox_savePassword);
cbLogin = (CheckBox) findViewById(R.id.checkBox_login);
sp = getSharedPreferences("config", MODE_PRIVATE);
}
@Override
public void onClick(View v) {
userName = etUerName.getText().toString().trim();
passWord = etPassWord.getText().toString().trim();
Log.i("main", "username" + userName);
Log.i("main", "password" + passWord);
switch (v.getId()) {
case R.id.button_login:
if (isScuess(userName, passWord)) {
// 当账号密码正确时 保存正确的信息
sp.edit().putString("username", userName).commit();
sp.edit().putString("password", passWord).commit();
goHomePager();// 跳到主页面
} else {
Toast.makeText(this, "账号或密码错误！", Toast.LENGTH_SHORT).show();
}
break;
case R.id.button_exit:
System.exit(0);
break;
case R.id.checkBox_login:
break;
case R.id.checkBox_savePassword:
if (cbSavePassword.isChecked()) {
sp.edit().putBoolean("isChecked", true).commit(); // 提交checkBox
// 点击
} else {
sp.edit().putBoolean("isChecked", false).commit(); // 提交checkBox
// 点击
}
break;
}
}
/**
* 跳转到主页面
*/
private void goHomePager() {
Intent intent = new Intent(this, HomeActivity.class);
startActivity(intent);
}
/**
* 判断账号密码是否 符合
*/
private boolean isScuess(String user, String password) {
if (user.equals("admin") && password.equals("admin")) {
Log.i("main", "成功");
return true;
}
return false;
}
}
第一步： 通过 getSharedPreferences（） 获取到 对象 第二步： 再通过 对象得到 sp.edit().putBoolean("isChecked", false).commit();edit 最后别忘了 一个要 commit（）；