ANDROID開發之問題積累及解決方案（一）

1、activity跳轉及傳值

　　當進行activity之間的跳轉時咱們會遇到這樣的問題。首先熟悉下activity之間跳轉。Activity跳轉與傳值，主要是經過Intent類來鏈接多個Activity，以及傳遞數據。幾種跳轉方式可參照Android之Activity的幾種跳轉方式和Activity的跳轉與傳值，下面來講說開發時遇到的錯誤。

一、Internal Server error

　　在開發工程時，有6個activity，又新增一個activity，這個activity有listview，目的是從這個新增的activity點擊item跳轉到另外的6個activity，以下代碼：

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //這裏作跳轉，跳轉到各自對應的頁
                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，運行程序時，程序在點擊跳轉時報Internal Server error錯誤，直譯爲「內部服務器錯誤」，因此錯就在Manifest.xml了，就讓咱們認識下它吧AndroidManifest.xml配置文件詳解 ，仔細查看Manifest.xml，確認是正確的，這就納悶了~~哪裏的錯了？？？順手點了根菸，邊抽邊想，這個調的web接口啊，或許是參數不對，抽完立刻查看，果真是這裏的問題，立馬給它傳個參數。

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //這裏作跳轉，跳轉到各自對應的頁
                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，這樣一debug，果真調方法了，此問題完美解決。