## Android 6.0 权限申请 ##

时间：2021-09-28 13:24:58

Android 6.0 权限申请

1. 以前的权限申请(sdk<23)

直接在AndroidManifest.xml中申明即可:

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

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

但是,Android sdk>=23(6.0)申明的权限是直接被拒绝的.需要我们在运行时去申请!

2. 运行时权限申请

void checkPermission() {

    final List<String> permissionsList = new ArrayList<>();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

        if ((checkSelfPermission(Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED))

            permissionsList.add(Manifest.permission.READ_PHONE_STATE);

        if ((checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED))

            permissionsList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);

        if (permissionsList.size() != 0) {

            requestPermissions(permissionsList.toArray(new String[permissionsList.size()]),

                    100);

        }else {

            //已经不是第一次,已经有权限

            Log.e("test","permissionsList.size()==0");

        }

    }

}

这个checkPermission()是Activity的方法.

所以在Application中是无法申请的,一些第三方库尽量避免在Application中初始化时调用危险权限!

3. 回调

private int count=0;

@TargetApi(Build.VERSION_CODES.M)

@Override

public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,

                                       @NonNull int[] grantResults) {

    count++;

    Log.e("test","onRequestPermissionsResult:"+count);

    if (requestCode==100){

        if (grantResults.length>0 && (checkSelfPermission(Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED) && (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)){

            Toast.makeText(this, "成功", Toast.LENGTH_SHORT).show();

        }else {

        }

    }

}

在logcat中:

08-03 20:09:20.545 16735-16735/didikee.com.demoapk E/test: onRequestPermissionsResult:1

结论:回调只会走一次!

当我们再次运行程序时,logcat中日志:

08-03 20:10:14.165 16735-16735/didikee.com.demoapk E/test: permissionsList.size()==0

结论:第一次获取到权限就会一直生效(不排除用户自己去去掉给你授予的某些权限 =.= 所以权限的申请还是按照需求来,别什么都不管就把权限列表轮一遍...这是大忌!)

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