/**
 * 显示底层错误信息并退出应用
 */
private void showDialog() {
	AlertDialog.Builder builder = new AlertDialog.Builder(this);
	builder.setTitle("信息提示");
	builder.setMessage("请打开相机权限");
	builder.setPositiveButton("完成", new FinishListener(this));
	builder.setOnCancelListener(new FinishListener(this));
	builder.show();
}