Android移动开发之【Android实战项目】DAY12-App实现修改密码

1.实现修改密码界面，主要是让用户在必要时修改自己的原始密码，从而保证用户信息的安全性。
2.界面效果如下：效果如下：

<?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:id="@+id/activity_modify_psw"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/register_bg"
    tools:context="itcast.cn.boxuegu.activity.ModifyPswActivity">
    <include layout="@layout/main_title_bar"/>
    <EditText
        android:id="@+id/et_original_psw"
        android:layout_width="fill_parent"
        android:layout_height="48dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginLeft="35dp"
        android:layout_marginRight="35dp"
        android:layout_marginTop="35dp"
        android:background="@drawable/register_user_name_bg"
        android:drawableLeft="@drawable/psw_icon"
        android:drawablePadding="10dp"
        android:gravity="center_vertical"
        android:hint="请输入原始密码"
        android:inputType="textPassword"
        android:paddingLeft="8dp"
        android:textColor="#000000"
        android:textColorHint="#a3a3a3"
        android:textSize="14sp"
        />
    <EditText
        android:id="@+id/et_new_psw"
        android:layout_width="fill_parent"
        android:layout_height="48dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginLeft="35dp"
        android:layout_marginRight="35dp"
        android:background="@drawable/register_user_name_bg"
        android:drawableLeft="@drawable/psw_icon"
        android:drawablePadding="10dp"
        android:gravity="center_vertical"
        android:hint="请输入新密码"
        android:inputType="textPassword"
        android:paddingLeft="8dp"
        android:textColor="#000000"
        android:textColorHint="#a3a3a3"
        android:textSize="14sp"
        />
    <EditText
        android:id="@+id/et_new_psw_again"
        android:layout_width="fill_parent"
        android:layout_height="48dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginLeft="35dp"
        android:layout_marginRight="35dp"
        android:background="@drawable/register_user_name_bg"
        android:drawableLeft="@drawable/psw_icon"
        android:drawablePadding="10dp"
        android:gravity="center_vertical"
        android:hint="请再次输入新密码"
        android:inputType="textPassword"
        android:paddingLeft="8dp"
        android:textColor="#000000"
        android:textColorHint="#a3a3a3"
        android:textSize="14sp"
        />
    <Button
        android:id="@+id/btn_save"
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:layout_marginLeft="35dp"
        android:layout_marginRight="35dp"
        android:layout_marginTop="15dp"
        android:layout_gravity="center_horizontal"
        android:background="@drawable/register_selector"
        android:text="保存"
        android:textColor="@android:color/white"
        android:textSize="18sp"
        />
</LinearLayout>

3.在实现修改密码界面逻辑代码中，主要用于输入原始密码，新密码，再次修改新密码。输入的原始密码与从SharedPrefenences中读取的原始密码必须一致，输入的新密码与原始密码不能相同，再次输入的新密码与与输入的新密码必须相同。以上条件都符合之后，点击“保存”按钮提示设置成功，同时修改Sharedference中的原始密码。

package itcast.cn.boxuegu.activity;

import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import itcast.cn.boxuegu.R;
import itcast.cn.boxuegu.utils.AnalysisUtils;
import itcast.cn.boxuegu.utils.MD5Utils;

public class ModifyPswActivity extends AppCompatActivity {

    private TextView tv_main_title;
    private TextView tv_back;
    private EditText et_original_psw;
    private EditText et_new_psw;
    private EditText et_new_psw_again;
    private Button btn_save;
    private String originalPsw;
    private String newPsw;
    private String newPswAgain;
    private String userName;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_modify_psw);
        init();
        userName = AnalysisUtils.readLoginUserName(this);
    }
    //  获取界面控件并处理相关控件的处理事件
    private void init() {
        tv_main_title = (TextView) findViewById(R.id.tv_main_title);
        tv_main_title.setText("修改密码");
        tv_back = (TextView) findViewById(R.id.tv_back);
        tv_back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ModifyPswActivity.this.finish();//关闭当前界面
            }
        });
        et_original_psw = (EditText) findViewById(R.id.et_original_psw);
        et_new_psw = (EditText) findViewById(R.id.et_new_psw);
        et_new_psw_again = (EditText) findViewById(R.id.et_new_psw_again);
        btn_save = (Button)  findViewById(R.id.btn_save);
        btn_save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getEditString();
                if (TextUtils.isEmpty(originalPsw)){
                    Toast.makeText(ModifyPswActivity.this,"请输入原始密码",Toast.LENGTH_SHORT).show();
                }else if (!MD5Utils.md5(originalPsw).equals(readPsw())){
                    Toast.makeText(ModifyPswActivity.this,"输入的密码与原始密码不一致",Toast.LENGTH_SHORT).show();
                }else if (MD5Utils.md5(newPsw).equals(readPsw())){
                    Toast.makeText(ModifyPswActivity.this,"输入的新密码与原始密码不能一致",Toast.LENGTH_SHORT).show();
                }else if (TextUtils.isEmpty(newPsw)){
                    Toast.makeText(ModifyPswActivity.this,"请输入新密码",Toast.LENGTH_SHORT).show();
                }else if (TextUtils.isEmpty(newPswAgain)){
                    Toast.makeText(ModifyPswActivity.this,"请再次输入新密码",Toast.LENGTH_SHORT).show();
                }else if (!newPsw.equals(newPswAgain)){
                    Toast.makeText(ModifyPswActivity.this,"两次输入的新密码不一致",Toast.LENGTH_SHORT).show();
                }else{
                    Toast.makeText(ModifyPswActivity.this,"新密码设置成功",Toast.LENGTH_SHORT).show();
                    //修改登录成功后保存在SharedPreferences中的密码
                    modifyPsw(newPsw);
                    Intent intent = new Intent(ModifyPswActivity.this,LoginActivity.class);
                    startActivity(intent);
                    ModifyPswActivity.this.finish();//关闭当前界面
                    SettingActivity.instance.finish();//关闭设置界面
                }
            }
        });

    }
    //修改登录成功后保存在SharedPreferences中的密码
    private void modifyPsw(String newPsw) {
        String md5Psw = MD5Utils.md5(newPsw);//对新密码进行加密
        SharedPreferences sp = getSharedPreferences("loginInfo",MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();//获取编辑器
        editor.putString(userName,md5Psw);
        editor.commit();

    }
    //从SharedPreferences中读取原始密码
    private String readPsw() {
        SharedPreferences sp = getSharedPreferences("loginInfo",MODE_PRIVATE);
        String spPsw = sp.getString(userName,"");
        return spPsw;

    }

    //h获取控件上的字符串
    private void getEditString() {
        originalPsw = et_original_psw.getText().toString().trim();
        newPsw = et_new_psw.getText().toString().trim();
        newPswAgain = et_new_psw_again.getText().toString().trim();
    }
}