android_10_文件访问权限

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效果:

代码:

    public void privateFile(){        //路径已经默认为data/data/包名/files        try {            FileOutputStream fos = openFileOutput("privateFile.txt", MODE_PRIVATE);            fos.write("beyond".getBytes());            fos.close();        } catch (Exception e) {            e.printStackTrace();        }    }        public void readFile(){        //路径已经默认为data/data/包名/files        try {            @SuppressWarnings("deprecation")            FileOutputStream fos = openFileOutput("readFile.txt",  MODE_WORLD_READABLE);            fos.write("beyond".getBytes());            fos.close();        } catch (Exception e) {            e.printStackTrace();        }    }    public void writeFile(){        //路径已经默认为data/data/包名/files        try {            @SuppressWarnings("deprecation")            FileOutputStream fos = openFileOutput("writeFile.txt",  MODE_WORLD_WRITEABLE);            fos.write("beyond".getBytes());            fos.close();        } catch (Exception e) {            e.printStackTrace();        }    }    public void readWriteFile(){        //路径已经默认为data/data/包名/files        try {            @SuppressWarnings("deprecation")            FileOutputStream fos = openFileOutput("readWriteFile.txt", MODE_WORLD_READABLE | MODE_WORLD_WRITEABLE);            fos.write("beyond".getBytes());            fos.close();        } catch (Exception e) {            e.printStackTrace();        }    }

另一个应用(去读取rw文件)

public void accessToReadWriteFile(View v){        File file = new File("data/data/com.sg31.globalFilePermission/files/readWriteFile.txt");        try {            FileInputStream fis = new FileInputStream(file);            BufferedReader br = new BufferedReader(new InputStreamReader(fis));            Toast.makeText(this, br.readLine(), 0).show();        } catch (Exception e) {            e.printStackTrace();        }    }

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