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使用SharedPreferences实现的记住密码功能，运行截图：
登录界面布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:context=".LoginActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="账号"
android:textSize="20sp" />
<EditText
android:id="@+id/account"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:maxLines="1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="密码"
android:textSize="20sp" />
<EditText
android:id="@+id/password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:inputType="textPassword"
android:maxLines="1" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<CheckBox
android:id="@+id/checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="记住密码"
android:textAllCaps="false"
android:textSize="25sp" />
<Button
android:id="@+id/btn_login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="登录"
android:textAllCaps="false"
android:textSize="25sp" />
</LinearLayout>
</LinearLayout>登录活动逻辑：
public class LoginActivity extends AppCompatActivity implements View.OnClickListener {
private EditText account;
private EditText password;
private CheckBox checkBox;
private Button login;
private SharedPreferences sharedPreferences;
private SharedPreferences.Editor editor;
private boolean isRemember;
private Intent intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
init();
}
private void init() {
account = findViewById(R.id.account);
password = findViewById(R.id.password);
checkBox = findViewById(R.id.checkbox);
login = findViewById(R.id.btn_login);
login.setOnClickListener(this);
sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
editor = sharedPreferences.edit();
isRemember = sharedPreferences.getBoolean("isRemember", false);
intent = new Intent(LoginActivity.this, MainActivity.class);
if (isRemember) {
account.setText(sharedPreferences.getString("account", null));
password.setText(sharedPreferences.getString("password", null));
checkBox.setChecked(true);
}
}
@Override
public void onClick(View v) {
if (account.getText().toString().equals("admin") && password.getText().toString().equals("123")) {
if (checkBox.isChecked()) {
editor.putBoolean("isRemember", true)
.putString("account", account.getText().toString())
.putString("password", password.getText().toString());
} else {
editor.clear();
}
editor.apply();
startActivity(intent);
finish();
} else {
Toast.makeText(this, "账号或密码错误！", Toast.LENGTH_SHORT).show();
}
}
}