PermissionUtils权限工具类

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public class PermissionUtils extends AppCompatActivity {

    private static final int PERMISSON_REQUESTCODE = 0;
    /**
     * 需要进行检测的权限数组
     */
    protected String[] needPermissions = {
            Manifest.permission.CAMERA,
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE
    };

    /**
     * 返回true 已经开启了需要的权限 false 未开启权限
     * @param permissions
     * @return
     */
    public boolean checkPermissions(String... permissions) {
        if (Build.VERSION.SDK_INT >= 23
                && getApplicationInfo().targetSdkVersion >= 23) {
            List<String> needRequestPermissonList = findDeniedPermissions(permissions);
            if (null != needRequestPermissonList
                    && needRequestPermissonList.size() > 0) {
                try {
                    String[] array = needRequestPermissonList.toArray(new String[needRequestPermissonList.size()]);
                    Method method = getClass().getMethod("requestPermissions", new Class[]{String[].class, int.class});
                    method.invoke(this, array, PERMISSON_REQUESTCODE);
                    return false;
                } catch (Exception e) {
                    return false;
                }
            } else {
                return true;
            }
        } else {
            return true;
        }
    }

    /**
     * 获取权限集中需要申请权限的列表
     *
     * @param permissions
     * @return
     */
    private List<String> findDeniedPermissions(String[] permissions) {
        List<String> needRequestPermissonList = new ArrayList<String>();
        try {
            for (String perm : permissions) {
                Method checkSelfMethod = getClass().getMethod("checkSelfPermission", String.class);
                Method shouldShowRequestPermissionRationaleMethod = getClass().getMethod("shouldShowRequestPermissionRationale",
                        String.class);
                if ((Integer) checkSelfMethod.invoke(this, perm) != PackageManager.PERMISSION_GRANTED
                        || (Boolean) shouldShowRequestPermissionRationaleMethod.invoke(this, perm)) {
                    needRequestPermissonList.add(perm);
                }
            }
        } catch (Throwable e) {

        }
        return needRequestPermissonList;
    }

    /**
     * 检测是否所有的权限都已经授权
     *
     * @param grantResults
     * @return
     */
    private boolean verifyPermissions(int[] grantResults) {
        for (int result : grantResults) {
            if (result != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }

    private PermissionListener mPermissionListener;

    public interface PermissionListener {
        void noPermission();

        void hasPermission();
    }

    /**
     * 设置权限监听
     * @param permissonListener
     */
    public void setPermissonListener(PermissionListener permissonListener) {
        this.mPermissionListener = permissonListener;
    }

    @TargetApi(23)
    public void onRequestPermissionsResult(int requestCode,
                                           String[] permissions, int[] paramArrayOfInt) {
        if (requestCode == PERMISSON_REQUESTCODE) {
            if (!verifyPermissions(paramArrayOfInt)) {
                showMissingPermissionDialog();
                mPermissionListener.noPermission();
            } else {
                mPermissionListener.hasPermission();
            }
        }
    }

    /**
     * 显示提示信息
     */
    private void showMissingPermissionDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("提示");
        builder.setMessage("当前应用缺少必要权限。请点击设置，开启所有权限");

        builder.setNegativeButton("取消",
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });

        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:" + getPackageName()));
        startActivity(intent);
    }
}