ANDROID开发之问题积累及解决方案（不断更新）

Posted 2020-06-17

一、activity跳转及传值

　　当进行activity之间的跳转时我们会遇到这样的问题。首先熟悉下activity之间跳转。Activity跳转与传值，主要是通过Intent类来连接多个Activity，以及传递数据。几种跳转方式可参照Android之Activity的几种跳转方式和Activity的跳转与传值，下面来说说开发时遇到的错误。

1、Internal Server error

　　在开发工程时，有6个activity，又新增一个activity，这个activity有listview，目的是从这个新增的activity点击item跳转到另外的6个activity，如下代码：

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //这里做跳转，跳转到各自对应的页
                switch (position) {
                case 1:
                    openActivity(TariffMajorGoodsListActivity.class);
                    break;
                case 2:
                    openActivity(TariffNativeDirectoryListActivity.class);
                    break;
                case 3:
                    openActivity(TariffTaxRateListActivity.class);
                    break;
                case 4:
                    openActivity(TariffCommentaryListActivity.class);
                    break;
                case 5:
                    openActivity(ClassifyDecisionListActivity.class);
                    break;
                case 6:
                    openActivity(ClassifyAdjudicationListActivity.class);
                    break;
                default:
                    break;
                }
            }

protected void openActivity(Class<?> pClass) {
        openActivity(pClass, null);
    }

    protected void openActivity(Class<?> pClass, Bundle pBundle) {
        Intent intent = new Intent(this, pClass);
        if (pBundle != null) {
            intent.putExtras(pBundle);
        }
        startActivity(intent);
    }

    protected void openActivity(String pAction) {
        openActivity(pAction, null);
    }

    protected void openActivity(String pAction, Bundle pBundle) {
        Intent intent = new Intent(pAction);
        if (pBundle != null) {
            intent.putExtras(pBundle);
        }
        startActivity(intent);
    }

然而，运行程序时，程序在点击跳转时报Internal Server error错误，直译为“内部服务器错误”，所以错就在Manifest.xml了，就让我们认识下它吧AndroidManifest.xml配置文件详解 ，仔细查看Manifest.xml，确认是正确的，这就纳闷了~~哪里的错了？？？顺手点了根烟，边抽边想，这个调的web接口啊，或许是参数不对，抽完马上查看，果然是这里的问题，立马给它传个参数。

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //这里做跳转，跳转到各自对应的页
                Bundle mBundle = new Bundle(); 
                Gson gson = new Gson();
                switch (position) {
                case 1:
                    MajorGoodsEntity majorGoodsEntity = new MajorGoodsEntity(null,datatotal,null,datatotal,null, null, null, null);
                    mBundle.putSerializable("majorGoods", majorGoodsEntity);
                    openActivity(TariffMajorGoodsListActivity.class,mBundle);
                    break;
                case 2:
                    NativeDirectoryEntity directoryEntity = new NativeDirectoryEntity(null,datatotal);
                    mBundle.putSerializable("nativeDirectory", directoryEntity);
                    openActivity(TariffNativeDirectoryListActivity.class,mBundle);
                    break;
                case 3:
                    TariffEntity queryEntity = new TariffEntity(null, datatotal,null, null, null, null, null, null, null, null);
                    mBundle.putSerializable("tariffQueryEntity", gson.toJson(queryEntity,TariffEntity.class));
                    openActivity(TariffTaxRateListActivity.class,mBundle);
                    break;
                case 4:
                    TariffCommentaryItemEntity commentaryItemEntity = new TariffCommentaryItemEntity(null, datatotal, null, null,null);
                    mBundle.putSerializable("commentaryItemEntity",commentaryItemEntity);
                    openActivity(TariffCommentaryListActivity.class,mBundle);
                    break;
                case 5:
                    ClassifyPublicationEntity entity =new ClassifyPublicationEntity("D",null, datatotal, null, null,null, null, null, null);
                    mBundle.putSerializable("conditionJSON", gson.toJson(entity, ClassifyPublicationEntity.class));
                    openActivity(ClassifyDecisionListActivity.class,mBundle);
                    break;
                case 6:
                    ClassifyPublicationEntity entitys =new ClassifyPublicationEntity("R",null,datatotal,null,null,null,null,null, null);
                    mBundle.putSerializable("conditionJSON", gson.toJson(entitys, ClassifyPublicationEntity.class));
                    openActivity(ClassifyAdjudicationListActivity.class,mBundle);
                    break;
                default:
                    break;
                }
            }

哈哈，这样一debug，果然调方法了，此问题完美解决。