## Android 6.0 权限申请 ##

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!)