Android加权限问题

1、静态加权限：

在AndroidManifest.xml中静态加权限：

这里写图片描述

这是添加的是对android设备文件操作时的读写权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

2、动态添加权限：
在Activity中动态添加
注：在Android6.0之后添加权限时，静态和动态都有添加才可

        //android 6.0 之后需要在activity中动态获取权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //申请WRITE_EXTERNAL_STORAGE权限
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    1);
        }
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //申请WRITE_EXTERNAL_STORAGE权限
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    1);
        }

动态添加权限之后，第一次运行程序会弹框提示是否用户同意。

3、动态添加多个权限：

    //先定义一String数组存所有要添加的权限名称
    //动态权限
    private String[] permissions = new String[]{
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.INTERNET,
            Manifest.permission.RECORD_AUDIO,
            Manifest.permission.ACCESS_NETWORK_STATE,
            Manifest.permission.ACCESS_WIFI_STATE,
            Manifest.permission.CHANGE_NETWORK_STATE,
            Manifest.permission.READ_PHONE_STATE,
            Manifest.permission.WRITE_SETTINGS,
    };
    //再定义ArrayList泛型集合来过滤实际要操作权限
    private ArrayList<String> arrayList = new ArrayList();

        //操作之前先清空arrayList
        arrayList.clear();
        //循环遍历
        for (int a = 0 ;a < permissions.length; a++){
            //先判断是否有对应权限
            if (ContextCompat.checkSelfPermission(this, permissions[a])
                != PackageManager.PERMISSION_GRANTED) {
                //没有就加进arrayList
                arrayList.add(permissions[a]);
            }
        }
        
        if (arrayList.isEmpty()){
            return;
        }else{
            //申请权限requestPermissions第二个参数是String[]，这里再把arrayList转换成string[]
            ActivityCompat.requestPermissions(this, arrayList.toArray(new String[arrayList.size()]),
                    1);
        }