SharedPreferences Write-优快云博客

本文链接：https://blog.youkuaiyun.com/dxm809/article/details/106180293

本文介绍了一个使用XML布局创建输入表单的示例，并通过Java代码展示了如何利用SharedPreferences存储用户输入的数据，包括姓名、年龄、身高、体重和婚姻状况。

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activity_share_write.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:orientation="vertical"
    android:padding="10dp" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp" >

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

        <EditText
            android:id="@+id/et_name"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="5dp"
            android:layout_toRightOf="@+id/tv_name"
            android:background="@drawable/editext_selector"
            android:gravity="left|center"
            android:hint="请输入姓名"
            android:inputType="text"
            android:maxLength="12"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textCursorDrawable="@drawable/text_cursor"
            android:textSize="17sp" />
    </RelativeLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp" >

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

        <EditText
            android:id="@+id/et_age"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="5dp"
            android:layout_toRightOf="@+id/tv_age"
            android:background="@drawable/editext_selector"
            android:gravity="left|center"
            android:hint="请输入年龄"
            android:inputType="number"
            android:maxLength="2"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textCursorDrawable="@drawable/text_cursor"
            android:textSize="17sp" />
    </RelativeLayout>
    
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp" >

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

        <EditText
            android:id="@+id/et_height"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="5dp"
            android:layout_toRightOf="@+id/tv_height"
            android:background="@drawable/editext_selector"
            android:gravity="left|center"
            android:hint="请输入身高"
            android:inputType="number"
            android:maxLength="3"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textCursorDrawable="@drawable/text_cursor"
            android:textSize="17sp" />
    </RelativeLayout>
    
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp" >

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

        <EditText
            android:id="@+id/et_weight"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="5dp"
            android:layout_toRightOf="@+id/tv_weight"
            android:background="@drawable/editext_selector"
            android:gravity="left|center"
            android:hint="请输入体重"
            android:inputType="numberDecimal"
            android:maxLength="5"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textCursorDrawable="@drawable/text_cursor"
            android:textSize="17sp" />
    </RelativeLayout>
    
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="50dp" >

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

        <Spinner
            android:id="@+id/sp_married"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_toRightOf="@+id/tv_married"
            android:gravity="left|center"
            android:spinnerMode="dialog" />
    </RelativeLayout>
    
    <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="20sp" />

</LinearLayout>

MainActivity.java

package com.example.forth;

import android.content.SharedPreferences;
import android.os.Bundle;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.text.TextUtils;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private SharedPreferences mShared; // 声明一个共享参数对象
    private EditText et_name;
    private EditText et_age;
    private EditText et_height;
    private EditText et_weight;
    private boolean bMarried = false;
    @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);
        findViewById(R.id.btn_save).setOnClickListener(this);
        initTypeSpinner();
        // 从share.xml中获取共享参数对象
        mShared = getSharedPreferences("share", MODE_PRIVATE);
    }

    // 初始化婚姻状况的下拉框
    private void initTypeSpinner() {
        ArrayAdapter<String> typeAdapter = new ArrayAdapter<String>(this,
                R.layout.item_select, typeArray);
        typeAdapter.setDropDownViewResource(R.layout.item_dropdown);
        Spinner sp_married = findViewById(R.id.sp_married);
        sp_married.setPrompt("请选择婚姻状况");
        sp_married.setAdapter(typeAdapter);
        sp_married.setSelection(0);
        sp_married.setOnItemSelectedListener(new TypeSelectedListener());
    }

    private String[] typeArray = {"未婚", "已婚"};
    class TypeSelectedListener implements AdapterView.OnItemSelectedListener {
        public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
            bMarried = (arg2==0)?false:true;
        }

        public void onNothingSelected(AdapterView<?> arg0) {
        }
    }
    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.btn_save) {
            String name = et_name.getText().toString();
            String age = et_age.getText().toString();
            String height = et_height.getText().toString();
            String weight = et_weight.getText().toString();
            if (TextUtils.isEmpty(name)) {
                showToast("请先填写姓名");
                return;
            } else if (TextUtils.isEmpty(age)) {
                showToast("请先填写年龄");
                return;
            } else if (TextUtils.isEmpty(height)) {
                showToast("请先填写身高");
                return;
            } else if (TextUtils.isEmpty(weight)) {
                showToast("请先填写体重");
                return;
            }

            SharedPreferences.Editor editor = mShared.edit(); // 获得编辑器的对象
            editor.putString("name", name); // 添加一个名叫name的字符串参数
            editor.putInt("age", Integer.parseInt(age)); // 添加一个名叫age的整型参数
            editor.putLong("height", Long.parseLong(height)); // 添加一个名叫height的长整型参数
            editor.putFloat("weight", Float.parseFloat(weight)); // 添加一个名叫weight的浮点数参数
            editor.putBoolean("married", bMarried); // 添加一个名叫married的布尔型参数
            editor.putString("update_time", DateUtil.getNowDateTime("yyyy-MM-dd HH:mm:ss"));
            editor.commit(); // 提交编辑器中的修改
            showToast("数据已写入共享参数");
        }
    }
    private void showToast(String desc) {
        Toast.makeText(this, desc, Toast.LENGTH_SHORT).show();
    }
}