app版本号跟app.gradle里面的versionname来设定

lizhanwei

2020-01-10 8ed48ac3077bab7dca002a85700665765903dcba

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package safeluck.drive.evaluation.util;
 
import android.app.Application;
import android.content.Context;
import android.content.res.Resources;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
 
public class FileUtil {
    /**
     * 读取assert目录下 txt文本文件内容
     * @param context
     * @param assetFileName
     * @return
     */
    public static StringBuffer readAssetTxtFile(Context context, String assetFileName) {
        String lineTxt = null;
        StringBuffer stringBuffer = new StringBuffer();
        try {
            InputStream inputStream = null;
            try {
                inputStream = context.getAssets()
                        .open(assetFileName);
            } catch (IOException e) {
                e.printStackTrace();
            }
 
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            while((lineTxt = bufferedReader.readLine()) != null){
                System.out.println(lineTxt);
                stringBuffer.append(lineTxt);
 
            }
            inputStreamReader.close();
            bufferedReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return stringBuffer;
    }
 
    /**
     *
     * @param fromFile 源文件路径包括文件名（绝对路径）
     * @param toFile
     */
    public static void copyFile(String fromFile,String toFile){
 
        try {
            InputStream inputStream =new FileInputStream(fromFile);
            OutputStream outputStream = new FileOutputStream(toFile);
            byte[] bytes = new byte[1024];
            while ((inputStream.read(bytes))>0){
                outputStream.write(bytes);
            }
            inputStream.close();
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
 
    }
 
    /**
     * 拷贝assert目录下的文件到 安装包目录下
     * @param context
     * @param assertfileName
     */
    public static void copyAssertFileToSD(Context context,String assertfileName){
        try {
            InputStream inputStream = null;
            try {
                inputStream = context.getAssets()
                        .open(assertfileName);
            } catch (IOException e) {
                e.printStackTrace();
            }
            OutputStream outputStream = new FileOutputStream(  new File(context.getExternalFilesDir(null), assertfileName));
            byte[] bytes = new byte[1024];
            while ((inputStream.read(bytes))>0){
                outputStream.write(bytes);
            }
            inputStream.close();
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
}