注意

Android6.0系统默认为targetSdkVersion小于23的应用默认授予了所申请的所有权限，所以如果你以前的APP设置的targetSdkVersion低于23，在运行时也不会崩溃，
但这也只是一个临时的救急策略，用户还是可以在设置中取消授予的权限。

android {
 compileSdkVersion 23
 buildToolsVersion "23.0.1"

 defaultConfig {
     applicationId "com.money.app
     minSdkVersion 18
     targetSdkVersion 23
     versionCode 1
     versionName "1.0"
 }
 buildTypes {
     release {
         minifyEnabled false
         proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
     }
 }
}

Camera权限

if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 1);
 
        }

存储的权限

if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 2);
        }

授权后的回调onRequestPermissionsResult

 @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                           int[] grantResults) {

        switch (requestCode) {
            case 1:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    checkStorgePermission();
                } else {
                    mHasPermission = false;
                }
                break;
            case 2:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    mHasPermission = true;
                } else {
                    mHasPermission = false;
                }
                break;
        }
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }

注意这里case 中的1和2，是Camera和存储权限的requestCode，这里来判断是哪个权限申请。

参考文章：
http://www.jianshu.com/p/b4a8b3d4f587