Android 文件寫入

 

package com.tdim.qas;

import android.content.ContentValues;
import android.content.Context;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;

public class Document_write {

    public  static  void write_file_to_document(Context context,String file_name, String str){


        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            write_file(context,file_name,str);
        }else{
            old_write(file_name,str);
        }


    }

    private  static  void write_file(Context context,String file_name,String str){

        try {
            ContentValues values = new ContentValues();
            values.put(MediaStore.MediaColumns.DISPLAY_NAME,file_name);       //file name
            values.put(MediaStore.MediaColumns.MIME_TYPE, "text/plain");        //file extension, will automatically add to file
            values.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_DOCUMENTS);
            Uri uri = context.getContentResolver().insert(MediaStore.Files.getContentUri("external"), values);      //important!
            OutputStream outputStream = context.getContentResolver().openOutputStream(uri);
            outputStream.write(str.getBytes());
            outputStream.close();
        }catch (Exception e){


        }


    }

    //可能需要權限
    private   static  void old_write(String file_name,String str){

        File dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS);
        File file = new File(dir, file_name);
        //Write to file
        try {
        FileWriter fileWriter = new FileWriter(file);
        fileWriter.write(str);
        fileWriter.close();
        
        } catch (IOException e) {
        //Handle exception
        }

    }
}