设置系统字体 fongScale 大小

FontScale.java

    // 详细信息参考： http://blog.chengyunfeng.com/?p=605 
    // 在 Manifest.xml 中添加权限
    //<uses-permission android:name="android.permission.WRITE_SETTINGS" />
    //<uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
    private Configuration mConfiguration = new Configuration();
    /** 获取当前系统的配置信息 */
    private void updateConfiguration() {
        try {
            Class<?> activityManagerNative = Class.forName("android.app.ActivityManagerNative");
            try {
                Object am = activityManagerNative.getMethod("getDefault").invoke(activityManagerNative);
                Object config = am.getClass().getMethod("getConfiguration").invoke(am);
                Configuration configs = (Configuration) config;
                mConfiguration.updateFrom(configs);
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (SecurityException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            }

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    
    /** 授权应用的权限*/
    private void grantPermision() {
        try {
            String cmd = "pm grant " + getActivity().getPackageName() + " android.permission.CHANGE_CONFIGURATION";
            CommandCapture command = new CommandCapture(0, false, cmd);
            RootTools.getShell(true).add(command);
            commandWait(Shell.startRootShell(), command);
            boolean result = command.getExitCode() == 0;
        } catch (IOException e) {
            e.printStackTrace();
        } catch (TimeoutException e) {
            e.printStackTrace();
        } catch (RootDeniedException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    private void commandWait(Shell shell, Command cmd) throws Exception {

        while (!cmd.isFinished()) {

            RootTools.log(TAG, shell.getCommandQueuePositionString(cmd));

            synchronized (cmd) {
                try {
                    if (!cmd.isFinished()) {
                        cmd.wait(2000);
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

            if (!cmd.isExecuting() && !cmd.isFinished()) {
                if (!shell.isExecuting && !shell.isReading) {
                    Log.e(TAG, "Waiting for a command to be executed in a shell that is not executing and not reading! \n\n Command: " + cmd.getCommand());
                    Exception e = new Exception();
                    e.setStackTrace(Thread.currentThread().getStackTrace());
                    e.printStackTrace();
                } else if (shell.isExecuting && !shell.isReading) {
                    Log.e(TAG, "Waiting for a command to be executed in a shell that is executing but not reading! \n\n Command: " + cmd.getCommand());
                    Exception e = new Exception();
                    e.setStackTrace(Thread.currentThread().getStackTrace());
                    e.printStackTrace();
                } else {
                    Log.e(TAG, "Waiting for a command to be executed in a shell that is not reading! \n\n Command: " + cmd.getCommand());
                    Exception e = new Exception();
                    e.setStackTrace(Thread.currentThread().getStackTrace());
                    e.printStackTrace();
                }
            }

        }
    }
  /** 设置字体*/
  public void setFontSize() {
        Method method;
        try {
            Class<?> activityManagerNative = Class.forName("android.app.ActivityManagerNative");
            try {
                Object am = activityManagerNative.getMethod("getDefault").invoke(activityManagerNative);
                method = am.getClass().getMethod("updatePersistentConfiguration", android.content.res.Configuration.class);
                
                method.invoke(am, mConfiguration);
                
            } catch (Exception e) {
                e.printStackTrace();
                
            }

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }