权限相关工具类

import android.annotation.TargetApi;import android.app.Activity;import android.content.Context;import android.content.pm.PackageManager;import android.os.Build;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import java.util.ArrayList;import java.util.List;

public final class PermissionUtils {    private static int mRequestCode = -1;    private static OnPermissionListener mOnPermissionListener;    public interface OnPermissionListener {        void onPermissionGranted();        void onPermissionDenied(String[] deniedPermissions);    }    public abstract static class RationaleHandler {        private Context context;        private int requestCode;        private String[] permissions;        protected abstract void showRationale();        void showRationale(Context context, int requestCode, String[] permissions) {            this.context = context;            this.requestCode = requestCode;            this.permissions = permissions;            showRationale();        }        @TargetApi(Build.VERSION_CODES.M)        public void requestPermissionsAgain() {            ((Activity) context).requestPermissions(permissions, requestCode);        }    }    @TargetApi(Build.VERSION_CODES.M)    public static void requestPermissions(Context context, int requestCode            , String[] permissions, OnPermissionListener listener) {        requestPermissions(context, requestCode, permissions, listener, null);    }    @TargetApi(Build.VERSION_CODES.M)    public static void requestPermissions(Context context, int requestCode            , String[] permissions, OnPermissionListener listener, RationaleHandler handler) {        if (context instanceof Activity) {            mRequestCode = requestCode;            mOnPermissionListener = listener;            String[] deniedPermissions = getDeniedPermissions(context, permissions);            if (deniedPermissions.length > 0) {                boolean rationale = shouldShowRequestPermissionRationale(context, deniedPermissions);                if (rationale && handler != null) {                    handler.showRationale(context, requestCode, deniedPermissions);                } else {                    ((Activity) context).requestPermissions(deniedPermissions, requestCode);                }            } else {                if (mOnPermissionListener != null)                    mOnPermissionListener.onPermissionGranted();            }        } else {            throw new RuntimeException("Context must be an Activity");        }    }    /**     * 请求权限结果，对应Activity中onRequestPermissionsResult()方法。     */    public static void onRequestPermissionsResult(Activity context, int requestCode, String[] permissions, int[]            grantResults) {        if (mRequestCode != -1 && requestCode == mRequestCode) {            if (mOnPermissionListener != null) {                String[] deniedPermissions = getDeniedPermissions(context, permissions);                if (deniedPermissions.length > 0) {                    mOnPermissionListener.onPermissionDenied(deniedPermissions);                } else {                    mOnPermissionListener.onPermissionGranted();                }            }        }    }    /**     * 获取请求权限中需要授权的权限     */    private static String[] getDeniedPermissions(Context context, String[] permissions) {        List<String> deniedPermissions = new ArrayList<>();        for (String permission : permissions) {            if (ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_DENIED) {                deniedPermissions.add(permission);            }        }        return deniedPermissions.toArray(new String[deniedPermissions.size()]);    }    /**     * 是否彻底拒绝了某项权限     */    public static boolean hasAlwaysDeniedPermission(Context context, String... deniedPermissions) {        for (String deniedPermission : deniedPermissions) {            if (!shouldShowRequestPermissionRationale(context, deniedPermission)) {                return true;            }        }        return false;    }    /**     * 是否有权限需要说明提示     */    private static boolean shouldShowRequestPermissionRationale(Context context, String... deniedPermissions) {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return false;        boolean rationale;        for (String permission : deniedPermissions) {            rationale = ActivityCompat.shouldShowRequestPermissionRationale((Activity) context, permission);            if (rationale) return true;        }        return false;    }}