百度地图骑行导航诱导页view空指针和初始化问题最佳解答

Android百度地图定位空指针问题解决android.os.Message com.baidu.location.g.f$d.obtainMessage(int, java.lang.Obj 问题: 在百度地图页面(Activity为singleTask)跳转到别的页面 ,离开地图页面。偶发性空指针,具体日志信息如下: 解决: 1、原本我在生命周期onStop里调用的mlocationClient.stop(); 把它改到在onDestroy调用 2、onDestory里面执行mBaiduMap=null; 其他地方用mBaiduMap进行非空判断 3、简单so文件是否正确(建议) 作者:Android_Mr_Zhao 立即下载

不得不说,百度的SDK集成真的很考验一个人的耐心、细心和用心,就拿百度地图SDK来说,

导航诱导页view空指针问题:
骑行导航demo:BaiduMapSDK_BikeNavi_AS_Demo
导航诱导页出现空指针问题,奇怪,demo可以,我集成之后不可以了,闪退,好气哦!这个坑花了我好几天的时间,每次想要吐槽官方文档写的差时,最后啪啪打自己的脸,说实话,还是自己粗心了。

Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference

在这里插入图片描述
哈哈哈~
发现了一个问题,demo源代码BNaviGuideActivity extends Activity改为BNaviGuideActivity extends AppCompatActivity也会出现上面的空指针(空对象)问题。WNaviGuideActivity也是一样。

解决:
Application方法中的ReflectHelper.unseal(base);千万不要弄丢了,问题就是出在这里。经过我多次的测试,发现Android R(11)仍存在闪退问题,想必是地图SDK还没适配Android R的原因。这个大家不用担心,Android Q(10)以下亲测有效。

public class BNaviDemoApplication extends Application {

    @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);
        ReflectHelper.unseal(base);//这家伙就是空指针的大罪人,一定不要弄丢了
    }

    @Override
    public void onCreate() {
        super.onCreate();
        SDKInitializer.initialize(this);
    }

}

初始化失败问题:
就是集成之后,运行没咋反应。
解决:
肯定是少了这张图片,补上就行了。
在这里插入图片描述

一个小建议:
下载官方demo,导入到Android studio,接着,新建一个新项目,把demo的代码原封不动复制过去一遍,成功之后,再集成到主项目,这会让你少走很多弯路。

从仿真到实践:两级直接耦合放大电路的静态工作点协同调试指南 本文详细解析了两级直接耦合放大电路的静态工作点协同调试方法,从仿真到实践提供系统指南。重点介绍了Rc2电阻调整技巧、集电极电位测量方法及常见问题排查,帮助工程师解决各级静态工作点相互影响的难题,提升模拟电路设计效率。 阅读详情

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