HarmonyOS 读取文件 随机更换段子_harmonyos fs 文件读取

base/profile下存放一个joke.txt文件

里面又三个笑话并且用---分割

“大爷，我现场采访您一下，您这样晨跑锻炼坚持几年了？”
“姑娘别挡道！我尿急！ ”
“请问你是做什么工作的？”
---
“哦。我的工作是杀僵尸。”
“嗯？可是这个世界上没有僵尸啊！ ”
“你以为它们是怎么没有的？”
---
中午去买菜，感觉都不太新鲜了。
老板：早上刚到的，都新鲜的。
我：这菜看着就蔫蔫的啊？！
老板：从早上到现在，它以为没人要自己了，这不垂头丧气么！
我。。。

布局

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">
 
    <Text
        ohos:id="$+id:joke"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="$graphic:background_ability_joke"
        ohos:layout_alignment="horizontal_center"
        ohos:multiple_lines="true"
        ohos:text="$string:jokeability_HelloWorld"
        ohos:text_size="40vp"
        />
 
    <Button
        ohos:id="$+id:btnReadRandom"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="$graphic:background_ability_joke"
        ohos:layout_alignment="horizontal_center"
        ohos:text="读取随机笑话"
        ohos:text_size="40vp"
        />
 
</DirectionalLayout>

     ohos:multiple_lines="true" 允许换行

代码

package com.example.helloworld.slice;
 
import com.example.helloworld.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Button;
import ohos.agp.components.Component;
import ohos.agp.components.Text;
import ohos.global.resource.NotExistException;
import ohos.global.resource.Resource;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Random;
 
public class JokeAbilitySlice extends AbilitySlice {
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_joke);
        Text text = findComponentById(ResourceTable.Id_joke);
        Button btnReadRandom = findComponentById(ResourceTable.Id_btnReadRandom);
        StringBuilder sb = new StringBuilder();
        try {
 
            //返回文件的字节流
            Resource resource = this.getResourceManager().getResource(ResourceTable.Profile_joke);
            //字节流
            BufferedReader br = new BufferedReader(new InputStreamReader(resource));
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
            br.close();
 
 
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NotExistException e) {
            e.printStackTrace();
        }
        btnReadRandom.setClickedListener(new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                String[] jocks = sb.toString().split("---");
                Random random = new Random();
                int index = random.nextInt(jocks.length);
                text.setText(jocks[index]);
            }
        });
    }
 
    @Override
    public void onActive() {
        super.onActive();
    }
 
    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}