setText方法提供随机输出

分类：编程问答

如何解决setText方法提供随机输出

在recyclerview中，我的Textview出现了奇怪的问题。

Recyclerview项目

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_marginBottom="10dp">



    <TextView
        android:id="@+id/eventName"
        android:text="@string/lorem"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        android:textSize="18sp"
        />


    <TextView
        android:id="@+id/eventDate"
        android:text="@string/lorem"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:textSize="18sp"
        />
    <TextView
        android:id="@+id/eventAlarm"
        android:text="@string/lorem"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@+id/eventName"
        app:layout_constraintStart_toStartOf="parent"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="@id/eventDelete"
        android:layout_marginTop="15dp"
        />

    <ImageView
        android:id="@+id/alarmIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toStartOf="@+id/eventDelete"
        app:layout_constraintBottom_toBottomOf="@id/eventDelete"
        android:layout_marginEnd="10dp"
        android:src="@drawable/ic_baseline_notifications_24"

        />
    <ImageButton
        android:id="@+id/eventDelete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/eventDate"
        android:src="@drawable/ic_baseline_delete_24"
        android:layout_marginTop="20dp"
        android:background="@color/colorWhite"
        />
</androidx.constraintlayout.widget.ConstraintLayout>

activity_main.xml 

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/newEventLayout"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/newEventLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="4dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent">

        <EditText
            android:id="@+id/name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="10dp"
            android:hint="@string/name_hint"
            android:textSize="18sp"
            app:layout_constraintEnd_toEndOf="@id/timePicker1"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/selectedDate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:text="@string/selected_date"
            android:textSize="18sp"
            app:layout_constraintEnd_toEndOf="@+id/datePicker"
            app:layout_constraintTop_toBottomOf="@+id/datePicker" />

        <Button
            android:id="@+id/datePicker"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="selectDate"
            android:text="@string/select_date"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/name"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/addCounter"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="24dp"
            android:onClick="newCountdown"
            android:text="@string/add_10_countdown"
            android:textSize="12sp"
            app:layout_constraintEnd_toEndOf="@+id/datePicker"
            app:layout_constraintTop_toBottomOf="@+id/alarmSwitch" />

        <androidx.appcompat.widget.SwitchCompat
            android:id="@+id/alarmSwitch"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="24dp"
            android:text="@string/alarm"
            app:layout_constraintEnd_toEndOf="@+id/datePicker"
            app:layout_constraintTop_toBottomOf="@+id/selectedDate" />

        <TimePicker
            android:id="@+id/timePicker1"

            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:timePickerMode="spinner"
            app:layout_constraintEnd_toStartOf="@+id/datePicker"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/name" />


    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

我的活动模式

package com.example.countdowntimer.model;

import java.util.Date;

public class Event {

    String name;
    Date date;
    Boolean alarm;

    public Event(String name,Date date) {
        this.name = name;
        this.date = date;
    }

    public Event(String name,Date date,boolean alarm) {
        this.name = name;
        this.date = date;
        this.alarm = alarm;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public Boolean getAlarm() {
        return alarm;
    }

    public void setAlarm(Boolean alarm) {
        this.alarm = alarm;
    }
}

主要活动


import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.SwitchCompat;
import androidx.core.content.res.ResourcesCompat;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.content.SharedPreferences;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.CalendarView;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;

import com.example.countdowntimer.adapter.Adapter;
import com.example.countdowntimer.model.Event;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.Type;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;
    EditText eventName;
    Button datePicker,addCounter;
    SwitchCompat alarmSwitch;
    TimePicker timePicker;
    ArrayList<Event> eventArrayList;
    Calendar newDate;
    TextView selectedDate;
    Adapter adapter;
    private static MainActivity instance;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //just findviewsbyid
        findViews();
        //load eventArraylist from sharedpreferences
        loadData();
        //set clock for 24h mode and starting time at 12:00
        setTimePicker();
        adapter = new Adapter(eventArrayList);
        recyclerView.setAdapter(adapter);
        recyclerView.addItemDecoration(new DividerItemDecoration(recyclerView.getContext(),DividerItemDecoration.VERTICAL));
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        instance = this;
        

    }

    public void newCountdown(View view) {
        String name = eventName.getText().toString();
        if(name.isEmpty())
        {
            new AlertDialog.Builder(this)
                    .setTitle("Warning")
                    .setMessage("Please specyfiy name")
                    .setNegativeButton("ok",null)
                    .show();
            eventName.setHintTextColor(getResources().getColor(R.color.colorRed));

        }
        if(newDate == null){
            new AlertDialog.Builder(this)
                    .setTitle("Warning")
                    .setMessage("Please specyfiy date")
                    .setNegativeButton("ok",null)
                    .show();
            datePicker.setTextColor(getResources().getColor(R.color.colorRed));
        }
        if(!name.isEmpty() && newDate != null){
            newDate.getTime();
            newDate.set(Calendar.HOUR_OF_DAY,timePicker.getHour());
            newDate.set(Calendar.MINUTE,timePicker.getMinute());
            Event event = new Event(name,newDate.getTime(),alarmSwitch.isChecked());
            eventArrayList.add(eventArrayList.size(),event);
            adapter.notifyItemInserted(eventArrayList.size());
            saveData();
            hideKeyboard(MainActivity.this);
            eventName.setHintTextColor(ResourcesCompat.getColor(getResources(),R.color.black,null));
            datePicker.setHintTextColor(ResourcesCompat.getColor(getResources(),R.color.white,null));

        }
    }


    @RequiresApi(api = Build.VERSION_CODES.N)
    public void selectDate(View view) {
        final Calendar calendar = Calendar.getInstance();
        final DatePickerDialog startTime = new DatePickerDialog(this,new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker datePicker,int y,int m,int d) {
                newDate = Calendar.getInstance();
                newDate.set(y,m,d);
                selectedDate.setText(d + "-" +m + "-" + y);
            }
        },calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH),calendar.get(Calendar.DAY_OF_MONTH));
        startTime.show();
    }


    private void findViews() {
        recyclerView = findViewById(R.id.recyclerView);
        eventName = findViewById(R.id.name);
        datePicker = findViewById(R.id.datePicker);
        addCounter = findViewById(R.id.addCounter);
        alarmSwitch = findViewById(R.id.alarmSwitch);
        timePicker = findViewById(R.id.timePicker1);
        selectedDate = findViewById(R.id.selectedDate);
        eventArrayList = new ArrayList<>();
    }

    private void setTimePicker() {
        timePicker.setIs24HourView(true);
        timePicker.setHour(12);
        timePicker.setMinute(0);
    }

    public static void hideKeyboard(Activity activity) {
        InputMethodManager imm = (InputMethodManager) activity.getSystemService(Activity.INPUT_METHOD_SERVICE);
        //Find the currently focused view,so we can grab the correct window token from it.
        View view = activity.getCurrentFocus();
        //If no view currently has focus,create a new one,just so we can grab a window token from it
        if (view == null) {
            view = new View(activity);
        }
        imm.hideSoftInputFromWindow(view.getWindowToken(),0);
    }

    public void saveData(){
        SharedPreferences sharedPreferences = getSharedPreferences("List storage",MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        Gson gson = new Gson();
        //put list of events in here
        String json = gson.toJson(eventArrayList);
        editor.putString("Events list",json);
        editor.apply();
    }

    private void loadData(){
        SharedPreferences sharedPreferences = getSharedPreferences("List storage",MODE_PRIVATE);
        Gson gson = new Gson();
        String json = sharedPreferences.getString("Events list",null);
        Type type = new TypeToken<ArrayList<Event>>() {}.getType();
        eventArrayList = gson.fromJson(json,type);
        if(eventArrayList == null)
        {
            eventArrayList = new ArrayList<Event>();
        }
    }

    public static MainActivity getInstance() {
        return instance;
    }


}

package com.example.countdowntimer.adapter;

import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.core.content.res.ResourcesCompat;
import androidx.recyclerview.widget.RecyclerView;

import com.example.countdowntimer.MainActivity;
import com.example.countdowntimer.R;
import com.example.countdowntimer.model.Event;

import java.text.SimpleDateFormat;
import java.util.ArrayList;

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
    ArrayList<Event> eventArrayList;
    TextView eventName;
    TextView eventDate;
    TextView eventAlarm;
    ImageButton eventDelete;
    ImageView alarmIcon;
    Drawable alarmOn;
    Drawable alarmOff;


    //simple constructor
    public Adapter(ArrayList<Event> eventArrayList) {
        this.eventArrayList = eventArrayList;
    }

    @NonNull
    @Override
    //we inflate view from layout file
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.recyclerview_countdown_item,parent,false);
        return new ViewHolder(view);
    }

    @Override
    //bind data here
    public void onBindViewHolder(@NonNull ViewHolder holder,int position) {
        Event event = eventArrayList.get(position);
        eventName.setText(event.getName());
        String date = new SimpleDateFormat("dd-MM-yyyy").format(event.getDate());
        String time = new SimpleDateFormat("HH-mm").format(event.getDate());
        eventDate.setText(date);
        eventAlarm.setText("Time: "+ time);
        if(event.getAlarm()!=null){
            if(event.getAlarm()){
                alarmIcon.setImageDrawable(alarmOn);
            }else {
                alarmIcon.setImageDrawable(alarmOff);

            }
        }






    }

    @Override
    public int getItemCount() {
        return eventArrayList.size();
    }



    public class ViewHolder extends RecyclerView.ViewHolder {
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            eventName = itemView.findViewById(R.id.eventName);
            eventDate = itemView.findViewById(R.id.eventDate);
            eventAlarm = itemView.findViewById(R.id.eventAlarm);
            eventDelete = itemView.findViewById(R.id.eventDelete);
            alarmIcon = itemView.findViewById(R.id.alarmIcon);
            alarmOn = ResourcesCompat.getDrawable(itemView.getResources(),R.drawable.ic_baseline_notifications_24,null);
            alarmOff = ResourcesCompat.getDrawable(itemView.getResources(),R.drawable.ic_baseline_notifications_off_24,null);
            eventDelete.setOnClickListener(new View.OnClickListener() {
                @Override
                //TODO some warning before removal
                public void onClick(View view) {
                    eventArrayList.remove(getAdapterPosition());
                    notifyItemRemoved(getAdapterPosition());
                    MainActivity.getInstance().saveData();
                }
            });


        }
    }
}

因此，当我使用相同的名称创建新事件时，在eventName textview中会得到一些随机值（在几个新对象之后，有时甚至是第一个或第二个）。如您所知，我将这些对象存储在共享首选项中，因此当我重新启动时，我的应用程序名称已更正，这使我感到困惑。我试图对其进行调试，并找出问题出在哪里，但每个步骤看起来都很好。

解决方法

尝试一下

adapter.notifyItemInserted(eventArrayList.size());

替换为

adapter.notifyItemInserted(eventArrayList.size() - 1);

arraylist的最后位置等于大小-1

已更新。而且：

 eventArrayList.add(eventArrayList.size(),event);

可以替换为

 eventArrayList.add(event);

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。

相关推荐

导入项目后报错问题
依赖报错 idea导入项目后依赖报错，解决方案：https://blog.csdn.net/weixin_42420249/article/details/81191861 依赖版本报错：更换其他版本 无法下载依赖可参考：https://blog.csdn.net/weixin_42628809/a
idea不能识别yaml文件
使用mybatis plus常见错误
错误1：代码生成器依赖和mybatis依赖冲突 启动项目时报错如下 2021-12-03 13:33:33.927 ERROR 7228 [ main] o.s.b.d.LoggingFailureAnalysisReporter : *************************** APPL
gradle常见问题与错误
错误1：gradle项目控制台输出为乱码 # 解决方案：https://blog.csdn.net/weixin_43501566/article/details/112482302 # 在gradle-wrapper.properties 添加以下内容 org.gradle.jvmargs=-Df
Mybatis Plus传入参数0不起作用
错误还原：在查询的过程中，传入的workType为0时，该条件不起作用 &lt;select id=&quot;xxx&quot;&gt; SELECT di.id, di.name, di.work_type, di.updated... &lt;where&gt; &lt;if test=&qu
linux中make编译源码包失败
报错如下，gcc版本太低 ^ server.c:5346:31: 错误：‘struct redisServer’没有名为‘server_cpulist’的成员 redisSetCpuAffinity(server.server_cpulist); ^ server.c: 在函数‘hasActiveC
微服务启动错误：Command line is too long. Shorten command line for
解决方案1 1、改项目中.idea/workspace.xml配置文件，增加dynamic.classpath参数 2、搜索PropertiesComponent，添加如下 &lt;property name=&quot;dynamic.classpath&quot; value=&quot;tru
vue常见错误
删除根组件app.vue中的默认代码后报错：Module Error (from ./node_modules/eslint-loader/index.js): 解决方案：关闭ESlint代码检测，在项目根目录创建vue.config.js，在文件中添加 module.exports = { lin
spark常见错误
查看spark默认的python版本 [root@master day27]# pyspark /home/software/spark-2.3.4-bin-hadoop2.7/conf/spark-env.sh: line 2: /usr/local/hadoop/bin/hadoop: No s
matplotlib报错：AttributeError: module 'backend_interagg' has no attribute 'FigureCanvas'. Did you mean: 'FigureCanvasAgg'?
使用本地python环境可以成功执行 import pandas as pd import matplotlib.pyplot as plt # 设置字体 plt.rcParams[&#39;font.sans-serif&#39;] = [&#39;SimHei&#39;] # 能正确显示负号 p
gitlab登录失败，报错：This challenge page was accidentally cached by an intermediary and is no longer available.
设置时间 控制面板
后端开发常见错误
错误1：Request method ‘DELETE‘ not supported 错误还原：controller层有一个接口，访问该接口时报错：Request method ‘DELETE‘ not supported 错误原因：没有接收到前端传入的参数，修改为如下 参考 错误2：cannot r
docker常见错误
错误1：启动docker镜像时报错：Error response from daemon: driver failed programming external connectivity on endpoint quirky_allen 解决方法：重启docker -&gt; systemctl r
idea常见错误
错误1：private field ‘xxx‘ is never assigned 按Altʾnter快捷键，选择第2项 参考：https://blog.csdn.net/shi_hong_fei_hei/article/details/88814070 错误2：启动时报错，不能找到主启动类 #
pip安装依赖失败
报错如下，通过源不能下载，最后警告pip需升级版本 Requirement already satisfied: pip in c:\users\ychen\appdata\local\programs\python\python310\lib\site-packages (22.0.4) Coll
maven常见错误
错误1：maven打包报错 错误还原：使用maven打包项目时报错如下 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources (default-resources)
cloud项目中常见错误
错误1：服务调用时报错 服务消费者模块assess通过openFeign调用服务提供者模块hires 如下为服务提供者模块hires的控制层接口 @RestController @RequestMapping(&quot;/hires&quot;) public class FeignControl
springboot常见错误
错误1：运行项目后报如下错误 解决方案 报错2：Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project sb 解决方案：在pom.
springmvc拦截器中使用redisTemplate报空指针异常
参考 错误原因 过滤器或拦截器在生效时，redisTemplate还没有注入 解决方案：在注入容器时就生效 @Component //项目运行时就注入Spring容器 public class RedisBean { @Resource private RedisTemplate&lt;String
vite报错：npm ERR! command C:WINDOWSsystem32cmd.exe /d /s /c C:UsersychenAppDataLocalTempnpx-dde1c848.cmd
使用vite构建项目报错 C:\Users\ychen\work&gt;npm init @vitejs/app @vitejs/create-app is deprecated, use npm init vite instead C:\Users\ychen\AppData\Local\npm-
pythonJavaScriptjavaHTMLPHPreactjsC#AndroidCSSNode.jssqlrpython-3.xMysqLjQueryc++pandasFlutterangularIOSdjangolinuxswifttypescript路由器JSON路由器设置无线路由器h3c华三华三路由器设置华三路由器电脑软件教程arraysdocker软件图文教程Cvue.jslaravelspring-boot