SharedPreferences - 技术栈

xml

XML 复制代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv_name"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="姓名："
            android:textColor="@color/black"
            android:textSize="17sp" />

        <EditText
            android:id="@+id/et_name"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="3dp"
            android:layout_marginBottom="3dp"
            android:layout_weight="1"
            android:background="@drawable/edit_select"
            android:hint="请输入姓名"
            android:inputType="text"
            android:maxLength="12"
            android:textColor="@color/black"
            android:textSize="17sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv_age"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="年龄："
            android:textColor="@color/black"
            android:textSize="17sp" />

        <EditText
            android:id="@+id/et_age"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="3dp"
            android:layout_marginBottom="3dp"
            android:layout_weight="1"
            android:background="@drawable/edit_select"
            android:hint="请输入年龄"
            android:inputType="number"
            android:maxLength="2"
            android:textColor="@color/black"
            android:textSize="17sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv_height"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="身高："
            android:textColor="@color/black"
            android:textSize="17sp" />

        <EditText
            android:id="@+id/et_height"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="3dp"
            android:layout_marginBottom="3dp"
            android:layout_weight="1"
            android:background="@drawable/edit_select"
            android:hint="请输入身高"
            android:inputType="numberDecimal"
            android:maxLength="5"
            android:textColor="@color/black"
            android:textSize="17sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv_weight"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="体重："
            android:textColor="@color/black"
            android:textSize="17sp" />

        <EditText
            android:id="@+id/et_weight"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="3dp"
            android:layout_marginBottom="3dp"
            android:layout_weight="1"
            android:background="@drawable/edit_select"
            android:hint="请输入体重"
            android:inputType="numberDecimal"
            android:maxLength="5"
            android:textColor="@color/black"
            android:textSize="17sp" />
    </LinearLayout>

    <CheckBox
        android:id="@+id/ck_married"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="false"
        android:gravity="center"
        android:text="已婚"
        android:textColor="@color/black"
        android:textSize="17sp" />

    <Button
        android:id="@+id/btn_save"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="保存到共享参数"
        android:textColor="@color/black"
        android:textSize="17sp" />

</LinearLayout>

Activity

java 复制代码

package com.tiger.chapter06;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;

public class ShareWriteActivity extends AppCompatActivity implements View.OnClickListener {
    private EditText et_name;
    private EditText et_age;
    private EditText et_height;
    private EditText et_weight;
    private CheckBox ck_married;
    private SharedPreferences preferences;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_share_write);
        et_name = findViewById(R.id.et_name);
        et_age = findViewById(R.id.et_age);
        et_height = findViewById(R.id.et_height);
        et_weight = findViewById(R.id.et_weight);
        ck_married = findViewById(R.id.ck_married);

        findViewById(R.id.btn_save).setOnClickListener(this);
        //第一个参数取个名字 第二个参数 为我们这个 SharedPreferences 设置为私有   是在私有目录下 其他应用程序没法访问，只能当前这个应用程序访问
        preferences = getSharedPreferences("config", Context.MODE_PRIVATE);


        reload();


    }

    private void reload() {
        String name = preferences.getString("name", "");
        et_name.setText(name);

        int age = preferences.getInt("age", 0);
        et_age.setText(String.valueOf(age));

        float height = preferences.getFloat("height", 0f);
        et_height.setText(String.valueOf(height));


        float weight = preferences.getFloat("weight", 0f);
        et_weight.setText(String.valueOf(weight));

        boolean married = preferences.getBoolean("married", false);
        ck_married.setChecked(married);
    }

    @Override
    public void onClick(View v) {
        String name = et_name.getText().toString();
        String age = et_age.getText().toString();
        String height = et_height.getText().toString();
        String weight = et_weight.getText().toString();

        //通过 SharedPreferences去编辑
        //先获取它的 编辑器
        SharedPreferences.Editor editor = preferences.edit();

        editor.putString("name",name);
        editor.putInt("age",Integer.valueOf(age));
        editor.putFloat("height",Float.valueOf(height));
        editor.putFloat("weight",Float.valueOf(weight));
        editor.putBoolean("married",ck_married.isChecked());
        //提交
        editor.commit();

    }
}

记住密码

java 复制代码

package com.tiger.chapter05;

import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.tiger.chapter05.util.ViewUtil;

import java.util.Random;

public class LoginMainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener, View.OnClickListener {

    private TextView tv_password;
    private EditText et_password;
    private Button btn_forget;
    private CheckBox ck_remember;
    private EditText et_phone;
    private RadioButton rb_password;
    private RadioButton rb_verifycode;
    private Button btn_login;
    private ActivityResultLauncher<Intent> register;

    private String verifyCode;

    private String mPassword = "196852";
    private SharedPreferences preferences;

    private Boolean isRemember = false;


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


        setContentView(R.layout.activity_login_main);

        RadioGroup rg_login = findViewById(R.id.rg_login);

        tv_password = findViewById(R.id.tv_password);
        et_password = findViewById(R.id.et_password);
        btn_forget = findViewById(R.id.btn_forget);
        ck_remember = findViewById(R.id.ck_remember);
        et_phone = findViewById(R.id.et_phone);
        rb_password = findViewById(R.id.rb_password);
        rb_verifycode = findViewById(R.id.rb_verifycode);
        btn_login = findViewById(R.id.btn_login);
        preferences = getSharedPreferences("config", Context.MODE_PRIVATE);

        reload();



        register = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback<ActivityResult>() {
            @Override
            public void onActivityResult(ActivityResult result) {

                Intent data = result.getData();
                if (data != null && result.getResultCode() == Activity.RESULT_OK) {
                    String newPassword = data.getStringExtra("new_password");
                    //用户密码已更改为新密码，故更新密码变量
                    mPassword = newPassword;
                }

            }
        });

        //给rg_login 设置单选监听器
        rg_login.setOnCheckedChangeListener(this);

        //主对象引用被垃圾回收，那么主对象里的子引用也会被垃圾回收

        //给et_phone添加文本变更监听器
        et_phone.addTextChangedListener(new HideTextWatcher(et_phone, 11));
        et_password.addTextChangedListener(new HideTextWatcher(et_password, 6));
        btn_forget.setOnClickListener(this);

        btn_login.setOnClickListener(this);

    }

    private void reload() {
        String phone = preferences.getString("phone", "");
        et_phone.setText(phone);

        String password = preferences.getString("password", "");
        et_password.setText(password);

        boolean isRemember = preferences.getBoolean("isRemember", false);
        ck_remember.setChecked(isRemember);


    }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        if (checkedId == R.id.rb_password) {
            //默认是密码被选中
            //文本
            tv_password.setText(getString(R.string.login_password));
            //编辑框
            et_password.setHint(getString(R.string.input_password));
            //按钮
            btn_forget.setText(getString(R.string.forget_password));
            //将记住密码设置为不可见
            ck_remember.setVisibility(View.VISIBLE);
        } else {
            //选择验证码登录
            //文本
            tv_password.setText(getString(R.string.verifycode));
            //编辑框
            et_password.setHint(getString(R.string.input_verifycode));
            //按钮
            btn_forget.setText(getString(R.string.get_verifycode));
            //将记住密码设置为不可见
            ck_remember.setVisibility(View.GONE);
        }


    }

    @Override
    public void onClick(View v) {
        String phone = et_phone.getText().toString();
        if (phone.length() < 11) {
            Toast.makeText(this, "请输入正确的手机号", Toast.LENGTH_LONG).show();
            return;
        }

        if (R.id.btn_forget == v.getId()) {

            if (rb_password.isChecked()) {
                //携带手机号码跳转到找回密码页面
                Intent intent = new Intent(this, LoginForgetActivity.class);
                intent.putExtra("phone", phone);
                register.launch(intent);
            } else {
                //生成6位随机的验证码
                verifyCode = String.format("%06d", new Random().nextInt(999999));
                //以下弹出提醒对话框，提示用户记住六位验证码数字
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("请记住验证码");
                builder.setMessage("手机号" + phone + ",本次验证码是" + verifyCode + ",请输入验证码");
                builder.setPositiveButton("好的", null);
                AlertDialog alertDialog = builder.create();
                alertDialog.show();
            }


        } else if (R.id.btn_login == v.getId()) {

            if (rb_password.isChecked()) {
                if (!mPassword.equals(et_password.getText().toString())) {
                    Toast.makeText(this, "请输入正确的密码", Toast.LENGTH_LONG).show();
                    return;
                }


                if (ck_remember.isChecked()) {

                }

                //提示用户登录成功
                loginSuccess(true);


            } else {

                if ("".equals(verifyCode)) {
                    Toast.makeText(this, "请先获取验证码", Toast.LENGTH_LONG).show();
                    return;
                }

                if (!verifyCode.equals(et_password.getText().toString())) {
                    Toast.makeText(this, "验证码不正确", Toast.LENGTH_LONG).show();
                    return;
                }


                //提示用户登录成功
                loginSuccess(false);

                verifyCode = "";


            }


        }


    }

    private void loginSuccess(boolean isPassword) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("登录成功");
        builder.setMessage("手机号" + et_phone.getText().toString() + "登录成功了");
        builder.setPositiveButton("确定返回", (dialog, which) -> {
            finish();
        });
        builder.setNegativeButton("我在看看", null);
        AlertDialog alertDialog = builder.create();
        alertDialog.show();

        SharedPreferences.Editor editor = preferences.edit();
        if (isPassword) {

            if (ck_remember.isChecked()) {
                editor.putString("phone", et_phone.getText().toString());
                editor.putString("password", et_password.getText().toString());
                editor.putBoolean("isRemember", ck_remember.isChecked());
                editor.commit();
            } else {
                editor.clear();
                editor.commit();
            }
        }else {
            editor.putString("phone", et_phone.getText().toString());
            editor.commit();
        }


    }


    //定义一个编辑框监听器 在输入文本达到指定长度是自动隐藏输入法
    private class HideTextWatcher implements TextWatcher {

        private EditText mView;
        private int maxLength;

        public HideTextWatcher(EditText mView, int maxLength) {
            this.mView = mView;
            this.maxLength = maxLength;
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {

            //获得已输入的文本字符串
            String str = s.toString();

            //输入文本达到11位 （如手机号码）,或者达到6位 (如登录密码)时 关闭输入法

            if (str.length() == maxLength) {
                ViewUtil.hideOneInputMethod(LoginMainActivity.this, mView);
            }
        }
    }

}