ghnb/gaoheng/LoginActivity.java

/*gaoheng*/
package net.micode.notes.ui;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import net.micode.notes.R;

public class LoginActivity extends Activity {

    EditText lg_password;
    Button lg_login;

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



        SharedPreferences pref = getSharedPreferences("user management", MODE_PRIVATE);
        boolean userBoolean = pref.getBoolean("user", false); // 获取用户是否设置了密码

        if (!userBoolean) { // userBoolean = false 时（没有设置密码），直接跳转到便签主界面
            Intent intent = new Intent(LoginActivity.this, NotesListActivity.class);
            startActivity(intent);
            finish();
        }

        setContentView(R.layout.activity_login);

        getWindow().setSoftInputMode(
                WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE
                        | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);

        lg_password = (EditText) findViewById(R.id.lg_password);
        lg_login = (Button) findViewById(R.id.login);
        lg_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences pref = getSharedPreferences("user management", MODE_PRIVATE);
                String password = pref.getString("password", "");

                if (!password.equals("") && password.equals(lg_password.getText().toString())) {
                    Intent intent = new Intent(LoginActivity.this, NotesListActivity.class);
                    startActivity(intent);
                    finish();
                } else {
                    Toast.makeText(LoginActivity.this, "密码错误", Toast.LENGTH_SHORT).show();
                    /*
                    用来重新登录或者忘记密码的时候更改
                    SharedPreferences.Editor editor = null;
                    editor.putString("password", "1234567");
                    editor.apply();
                    */
                    lg_password.setText(""); // 把密码框内输入过的错误密码清空
                }
            }
        });
    }
}