MiNote/src/main/java/net/micode/notes/ui/LoginActivity.java

package net.micode.notes.ui;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
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 User_boolean = pref.getBoolean("user",false);//获取用户是否设置了密码
        if(!User_boolean) //User_boolean = false时，（没有设置密码），直接跳转到便签主界面
        {
            Intent intent=new Intent(LoginActivity.this,SplashActivity.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("")==false&&password.equals(lg_password.getText().toString())==true){
                        Intent intent=new Intent(LoginActivity.this,SplashActivity.class);
                        startActivity(intent);
                        finish();
                    }
                else{
                        Toast.makeText(LoginActivity.this, "密码错误", Toast.LENGTH_SHORT).show();
                        lg_password.setText("");//把密码框内输入过的错误密码清空
                    }
                }
            }
        );

    }
}