Question

我尝试通过改型来获取数据，然后使用响应主体尝试使用Work Manager将列插入到Room Database中。但是即使doWork（）方法在后台线程上工作，它仍然会在主线程异常上提供错误网络。请帮助我解决其他引入异步任务的解决方案，因为如果引入了异步任务，那么我的WorkManagers默认方法例如beginWith（），then（）将开始并行工作，而不是顺序工作。

BillTaxInfoDAO billTaxInfoDAO = db.billTaxInfoDao（）; billTaxInfoDAO.insert（billTaxInfo）; 这两行在主线程异常上提供了网络。

错误：无法访问主线程上的数据库，因为它可能长时间锁定UI。在androidx.room.RoomDatabase.assertNotMainThread（RoomDatabase.java:209）在androidx.room.RoomDatabase.beginTransaction（RoomDatabase.java:256）在com.witbybit.offlinepos.datamodels.pointofsale.BillTaxInfoDAO_Impl.insert（BillTaxInfoDAO_Impl.java:103）在com.witbybit.offlinepos.restore.RestoreManager $ 4.onResponse（RestoreManager.java:196）

MyWorker类

@NonNull
@Override
public Result doWork() {
    try {
        Data data = getInputData();
        String choice = data.getString("method");
        switch (choice) {
            case "back_up_found":{isBackUpfound();break;}
            case "bill_tax_info": {billTaxInfoRestore();break;}
            case "category": {categoryRestore();break;}
            case "customer": {customerRestore();break;}
            case "outlet": {outletRestore();break;}
            case "payment_entry": {paymentEntryRestore();break;}
            case "pos_bill": {posBillRestore();break;}
            case "pos_bill_item": {posBillItemRestore();break;}
            case "pos_item": {posItemRestore();break;}
            case "tax": {taxRestore();break;}
            case "tax_group": {taxGroupRestore();break;}
            case "user": {userRestore();break;}
            case "user_sms_data": {userSMSData();break;}
            default: {Log.wtf(TAG, "default called");}
        }
        return Result.success(data);
    }catch (Exception e){
        Log.wtf(TAG,"Failed for "+e.getMessage() );
        return Result.failure();
    }

}

public void isBackUpfound(){
    RestoreApiClient restoreApiClient=getRetrofit().create(RestoreApiClient.class);
    Call<List<Object>> call=restoreApiClient.isBackUpFound();
    call.enqueue(new Callback<List<Object>>() {
        @Override
        public void onResponse(Call<List<Object>> call, Response<List<Object>> response) {
            for(Object object:response.body()){
                HashMap<String,Double> map=new Gson().fromJson(new Gson().toJson(object),HashMap.class);
                double row_count=map.get("row");
                if(row_count>1){
                    Log.wtf("Restore Manager" ,"Backup Found");
                }
            }
        }

        @Override
        public void onFailure(Call<List<Object>> call, Throwable t) {

        }
    });
}


private void billTaxInfoRestore(){
    RestoreApiClient apiClient=RestoreManager.getRetrofit().create(RestoreApiClient.class);
    Call<List<Object>> call=apiClient.getEachTableData("bill_tax_info");
    call.enqueue(new Callback<List<Object>>() {
        @Override
        public void onResponse(Call<List<Object>> call, Response<List<Object>> response) {
            for (Object object: response.body()) {
                Gson gson=new Gson();
                BillTaxInfo billTaxInfo=gson.fromJson(gson.toJson(object),BillTaxInfo.class);
                //BillsRepository.billTaxInfoInsert(billTaxInfo,getApplicationContext());
                AppDatabase db = AppDatabase.getDatabase(getApplicationContext());
                BillTaxInfoDAO billTaxInfoDAO=db.billTaxInfoDao();
                billTaxInfoDAO.insert(billTaxInfo);
              }
            Log.wtf(TAG,"bills restore complete");
        }

        @Override
        public void onFailure(Call<List<Object>> call, Throwable t) {
            Log.wtf("Restore Manager","failure "+t);
        }
    });
}

这是我的呼叫片段类

var tax_bill_info_request=OneTimeWorkRequest.Builder(RestoreManager::class.java!!)
            .setInputData(Data.Builder().putString("method", "bill_tax_info").build())
            .build()
    var category_request=OneTimeWorkRequest.Builder(RestoreManager::class.java!!)
            .setInputData(Data.Builder().putString("method", "category").build())
            .build()
    requests.add(tax_bill_info_request)
    requests.add(category_request)

    WorkManager.getInstance().getWorkInfoByIdLiveData(tax_bill_info_request.id).observe(this, Observer {
        restore_textview.text =restore_textview.text.toString() + it.outputData.getString("method")+" "+it.state.name
    })

    WorkManager.getInstance().getWorkInfoByIdLiveData(category_request.id).observe(this, Observer {
        restore_textview.text =restore_textview.text.toString() + it.outputData.getString("method")+" "+it.state.name
    })



    restoreButton?.setOnClickListener{view ->
        try {
            startRestore()
        }catch (e:Exception){
            Log.wtf(TAG,e.message)
        }
    }


fun startRestore(){
    WorkManager.getInstance()
            .beginWith(requests.get(0))
            .then(requests.get(1))
            .enqueue()
}

Answer 1

stacktrace在WorkManager中没有任何指示。看起来您的RestoreManager＃onResponse正在主线程上发生。您应该检查这段代码的状况。也许您的网络响应会自动传递到主线程。

工作管理器无法处理将后台线程插入值到数据库的

1 个答案: