Android 文件读写 + 申请权限

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Android 文件读写 + 申请权限

/***  获取文件*  /storage/emulated/0/xxx/xxx.text*  /data/xxx/xxx.text* @return*/private static File getFile() {File file = null;//SD卡存在if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {file = Environment.getExternalStorageDirectory();} else {file = Environment.getDataDirectory();}file = new File(file.getPath() + BASE_URL);if (!file.exists()) {file.mkdir();}file = new File(file.getPath() + FILE_NAME);Log.d(TAG, "getFile: " + file.getPath());return file;}/*** 写入内容* @param content*/public static void write(String content) {BufferedWriter writer = null;FileOutputStream out = null;try {out = new FileOutputStream(getFile());writer = new BufferedWriter(new OutputStreamWriter(out));writer.write(content);} catch (Exception e) {e.printStackTrace();} finally {try {if (writer != null) {writer.flush();writer.close();}if (out != null)out.close();} catch (IOException e) {e.printStackTrace();}}}/*** 加载文件内容* @return*/public static String load() {FileInputStream in = null;BufferedReader reader = null;StringBuilder content = new StringBuilder();try {//设置将要打开的存储文件名称in = new FileInputStream(getFile());//FileInputStream -> InputStreamReader ->BufferedReaderreader = new BufferedReader(new InputStreamReader(in));String line = new String();//读取每一行数据，并追加到StringBuilder对象中，直到结束while ((line = reader.readLine()) != null) {content.append(line);}} catch (IOException e) {e.printStackTrace();} finally {try {if (reader != null) {reader.close();}if (in != null) in.close();} catch (IOException e) {e.printStackTrace();}}Log.d(TAG, "load: "+ content.toString());return content.toString();}

Android6.0要验证权限

 /*** * 【动态申请SD卡读写的权限】* * Android6.0之后系统对权限的管理更加严格了，不但要在AndroidManifest中添加，还要在应用运行的时候动态申请* ***/private static final int REQUEST_EXTERNAL_STORAGE = 1;private static String[] PERMISSON_STORAGE = {"android.permission.READ_EXTERNAL_STORAGE","android.permission.WRITE_EXTERNAL_STORAGE"};public static void verifyStoragePermissions(Activity activity) {try {int permission = ActivityCompat.checkSelfPermission(activity, "android.permission.WRITE_EXTERNAL_STORAGE");if (permission != PackageManager.PERMISSION_GRANTED) {/**【判断是否已经授予权限】**/ActivityCompat.requestPermissions(activity, PERMISSON_STORAGE, REQUEST_EXTERNAL_STORAGE);}} catch (Exception e) {e.printStackTrace();}}