private boolean deniedPermission(String permission) {
        return ContextCompat.checkSelfPermission(mContext,permission)== PackageManager.PERMISSION_DENIED;
}

/**
 * 6.0 运行权限处理
 */
public class MainActivity extends AppCompatActivity {
    private static final int REQUEST_CODE = 0; // 请求码
    private boolean isRequireCheck; // 是否需要系统权限检测
    //危险权限（运行时权限）
    static final String[] PERMISSIONS = new String[]{
            Manifest.permission.CAMERA,
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
    };
    private PermissionsChecker mPermissionsChecker;//检查权限
    private static final int PERMISSION_REQUEST_CODE = 0;        // 系统权限返回码
    private static final String PACKAGE_URL_SCHEME = "package:";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mPermissionsChecker = new PermissionsChecker(this);
        isRequireCheck = true;
    }
    @Override
    protected void onResume() {
        super.onResume();
        if (isRequireCheck) {
        //权限没有授权，进入授权界面
            if(mPermissionsChecker.judgePermissions(PERMISSIONS)){
                ActivityCompat.requestPermissions(this, PERMISSIONS, PERMISSION_REQUEST_CODE);
            }
        }else{
            isRequireCheck = true;
        }
    }
    /**
     * 用户权限处理,
     * 如果全部获取, 则直接过.
     * 如果权限缺失, 则提示Dialog.
     * @param requestCode  请求码
     * @param permissions  权限
     * @param grantResults 结果
     */
    @Override
    public void onRequestPermissionsResult(int requestCode,  String[] permissions,  int[] grantResults) {
        if (requestCode == PERMISSION_REQUEST_CODE && hasAllPermissionsGranted(grantResults)) {
            isRequireCheck = true;
        } else {
            isRequireCheck = false;
            showPermissionDialog();
        }
    }
    // 含有全部的权限
    private boolean hasAllPermissionsGranted( int[] grantResults) {
        for (int grantResult : grantResults) {
            if (grantResult == PackageManager.PERMISSION_DENIED) {
                return false;
            }
        }
        return true;
    }
    /**
     * 提示对话框
     */
    private void showPermissionDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle("帮助");
        builder.setMessage("当前应用缺少必要权限。请点击\"设置\"-打开所需权限。");
        // 拒绝, 退出应用
        builder.setNegativeButton("退出", new DialogInterface.OnClickListener() {
            @Override public void onClick(DialogInterface dialog, int which) {
//                setResult(PERMISSIONS_DENIED);
                finish();
            }
        });
        builder.setPositiveButton("设置", new DialogInterface.OnClickListener() {
            @Override public void onClick(DialogInterface dialog, int which) {
                startAppSettings();
            }
        });
        builder.setCancelable(false);
        builder.show();
    }
    // 启动应用的设置
    private void startAppSettings() {
        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        intent.setData(Uri.parse(PACKAGE_URL_SCHEME + getPackageName()));
        startActivity(intent);
    }
}