Android中文件的读写操作

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一、读取assets目录下的文件

try {            InputStream is = getResources().getAssets().open("asset.txt");            InputStreamReader isr = new InputStreamReader(is, "utf-8");            BufferedReader br = new BufferedReader(isr);            String str_asset = "";            while ((str_asset = br.readLine()) != null) {                Log.d("MainActivity", str_asset);            }        } catch (IOException e) {            e.printStackTrace();        }

二、读取raw目录下的文件

 try {            InputStream is = getResources().openRawResource(R.raw.raw);            InputStreamReader isr = new InputStreamReader(is, "utf-8");            BufferedReader br = new BufferedReader(isr);            String str_raw = "";            while ((str_raw = br.readLine()) != null) {                Log.d("MainActivity", str_raw);            }        } catch (IOException e) {            e.printStackTrace();        }

三、读取手机存储文件(内置)

 try {            FileInputStream fis = openFileInput(fileName);            InputStreamReader isr = new InputStreamReader(fis, "utf-8");            char input[] = new char[fis.available()];            isr.read(input);            isr.close();            fis.close();            String readed = new String(input);            show_text.setText(readed);        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }

四、写入到手机存储(内置)

 try {            FileOutputStream fos = openFileOutput(fileName, Context.MODE_PRIVATE);            OutputStreamWriter osw = new OutputStreamWriter(fos, "utf-8");            osw.write(mText.getText().toString());            osw.flush();            fos.flush();            osw.close();            fos.close();            Toast.makeText(MainActivity.this, "写入完成", Toast.LENGTH_SHORT).show();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }

五、读取SDCARD存储文件

 File myfile = new File(sdcard, "This is my file.txt");        if (myfile.exists()) {            try {                FileInputStream fis = new FileInputStream(myfile);                InputStreamReader isr = new InputStreamReader(fis, "utf-8");                char input[] = new char[fis.available()];                isr.read(input);                String str = new String(input);                show_text_out.setText(str);            } catch (FileNotFoundException e) {                e.printStackTrace();            } catch (UnsupportedEncodingException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }        }

六、写入SDCARD存储

 File myFile = new File(sdcard, "This is my file.txt");        if (!sdcard.exists()) {            Toast.makeText(MainActivity.this, "当前系统不具备SD卡目录", Toast.LENGTH_SHORT).show();            return;        }        try {            myFile.createNewFile();            Toast.makeText(MainActivity.this, "文件创建完成", Toast.LENGTH_SHORT).show();            FileOutputStream fos = new FileOutputStream(myFile);            OutputStreamWriter osw = new OutputStreamWriter(fos, "utf-8");            osw.write(text_out.getText().toString());            osw.flush();            fos.flush();            osw.close();            fos.close();            Toast.makeText(MainActivity.this, "文件已经写入完成", Toast.LENGTH_SHORT).show();        } catch (IOException e) {            e.printStackTrace();        }

Github地址：https://github.com/wuyinlei/AndroidFileOperator

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