android 应用内动态申请读写权限

用的框架：

/**
     * 动态权限
     * https://github.com/googlesamples/easypermissions
     * */
    implementation 'pub.devrel:easypermissions:1.3.0'

业务流程：

1. 调用权限服务之前，获取当前权限状态，如果没有则申请权限
2. 获取到了权限则调用服务，否则禁止调用(闪退)

来个调用相机的例子：

1. 添加imageview点击事件,点击调用相册

imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                methodRequiresCameraPermission();
            }
        });

2. 调用相机的代码如下：

// 相机权限
    @AfterPermissionGranted(KapPermissionUtils.RC_CAMERA_AND_LOCATION)
    private void methodRequiresCameraPermission(){
        String[] perms = KapPermissionUtils.KapPermissionCamera();
        if (EasyPermissions.hasPermissions(getContext(), perms)) {
            pushImageActivity();// 按业务自己跳转
        } else {
            EasyPermissions.requestPermissions(this, alert_permission_camera,
                    KapPermissionUtils.RC_CAMERA_AND_LOCATION, perms);
        }
    }

3. 系统权限回调交托

/** 权限申请 */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        // 权限申请
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }

4. 自己写的一个配置类

/**
 * Created by jing on 2017/7/4.
 * 动态权限申请
 */

public class KapPermissionUtils {
    /** 相机相册 */
    public static final int RC_CAMERA_AND_LOCATION = 1001;
    public static String[] KapPermissionCamera(){
        String[] perms;
        perms = new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE};
        return perms;
    }

    /** 通讯录 */
    public static final int RC_CONTACTS_PERM= 1003;
    public static String[] KapPermissionContacts(){
        String[] perms;
        perms = new String[]{Manifest.permission.READ_CONTACTS};
        return perms;
    }

    public static final int RC_SD_PERM = 1002;//

}