Android文件读写操作_android inputstream inputstream = getresources().g-优快云博客

本文介绍了如何在Android应用中进行文件的读写操作，包括从Assets和raw资源中读取文件，以及如何向外部存储（如SD卡）写入文件，并再次读取这些文件。

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读取Assets中的文件数据

InputStream is = getResources().getAssets()
                            .open("读取的文件名");
                    InputStreamReader isr = new InputStreamReader(is,"utf-8");
                    BufferedReader bf = new BufferedReader(isr);
                    String string="";
                    while ((string = bf.readLine()) != null) {
                        System.out.println(string);
                    }

读取raw中的文件数据

InputStream is = getResources().openRawResource(R.raw.读取的文件名);
                    InputStreamReader isr = new InputStreamReader(is,"utf-8");
                    BufferedReader bf = new BufferedReader(isr);
                    String string="";
                    while ((string = bf.readLine()) != null) {
                        System.out.println(string);
                    }

写入外部存储文件

//获取SD卡根路径
                File sdPath = Environment.getExternalStorageDirectory();
                File file = new File(sdPath, "我的文件.txt");
                //如果不存在SD卡，则不写入
                if(!sdPath.exists()){
                    Toast.makeText(MainActivity.this, "无SD卡", Toast.LENGTH_SHORT).show();
                }else{
                    try {
                        //如果文件夹不存在则创建
                        if(!file.exists()){
                            file.createNewFile();
                            FileOutputStream fos = new FileOutputStream(file);
                            OutputStreamWriter osw = new OutputStreamWriter(fos, "utf-8");
                            osw.write("我是内容");
                            osw.flush();
                            fos.flush();
                            osw.close();
                            fos.close();
                            Toast.makeText(MainActivity.this, "已创建", Toast.LENGTH_SHORT).show();
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }

读取外部存储文件

//获取SD卡根路径
                File sdPath = Environment.getExternalStorageDirectory();
                File file = new File(sdPath, "我的文件.txt");
                try {
                    //如果文件存在则读取
                    if(file.exists()){
                        FileInputStream fis = new FileInputStream(file);
                        InputStreamReader isr = new InputStreamReader(fis, "utf-8");
                        char[] buf = new char[fis.available()];
                        isr.read(buf);
                        isr.close();
                        fis.close();
                        String string = new String(buf);
                        Toast.makeText(MainActivity.this, string, Toast.LENGTH_SHORT).show();
                    }
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }