效果展示

具体实现

导入第三方库

在build.gradle(:app)的dependencies中加入以下代码引用第三方库

//Json库
implementation 'com.alibaba:fastjson:1.2.76'
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项目结构

assets文件夹位置

assets文件夹需要带小绿标志，否则会找不到文件(可以看下面创建步骤来)

创建步骤

src右键New点击Folder下面的Assets Folder

+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
随后会出来这个页面，要选中Change Folder Location，然后接着看下面的图(有具体操作步骤)

+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
勾选换路径，这里选择放在src文件夹下，和main为同一级，点击Finish，创建后如果和博主的图标一致即创建成功

代码实现

ReadWriteUtils

package top.gaojc.util;

import android.content.Context;
import android.content.res.AssetManager;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class ReadWriteUtils{

	//从assets资源文件中读取返回字符串
    public static String readStringFromAssets(Context context, String fileName) {
        //通过设备管理对象 获取Asset的资源路径
        AssetManager assetManager = context.getAssets();

        InputStream inputStream = null;
        InputStreamReader isr = null;
        BufferedReader br = null;

        StringBuffer sb = new StringBuffer();
        try {
            inputStream = assetManager.open(fileName);
            isr = new InputStreamReader(inputStream);
            br = new BufferedReader(isr);

            sb.append(br.readLine());
            String line = null;
            while ((line = br.readLine()) != null) {
                sb.append("\n" + line);
            }
            br.close();
            isr.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
                if (isr != null) {
                    isr.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

}
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Test.java

public class Test{

	private int intValue;
    private String strX;
    private String strY;
    
	//示例代码
	private void getAssetsValue() {
		String bannerConfig = DialogManager.readStringFromAssets(context, "test.json");
        if (!TextUtils.isEmpty(bannerConfig)) {
            try {
                JSONObject jsonObject = JSON.parseObject(bannerConfig);
                if (jsonObject.containsKey("intValue")) {
                    intValue = jsonObject.getIntValue("intValue");
                }
                if (jsonObject.containsKey("arr")) {
                    JSONObject jsonObject1 = jsonObject.getJSONObject("arr");
                    if (jsonObject1.containsKey("strX")) {
                        strX = jsonObject1.getString("strX");
                    }
                    if (jsonObject1.containsKey("strY")) {
                        strY = jsonObject1.getString("strY");
                    }
                }
            } catch (Throwable e) {
                e.printStackTrace();
            }
        }
    }
    
}
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