从Activity上下文外部调用startActivity（）需要FLAG_ACTIVITY_NEW_TASK标志。这真的是你想要的吗？ [英] Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

问题描述

是android中的新手，尝试通过适配器转到下一个Activity，我使用 onBindViewHolder（）并使用 Intent ，下面是代码：

Am new in android, trying to go to the next Activity through an Adapter, and i am using onBindViewHolder() with an Intent , below is the code :

@Override
    public void onBindViewHolder(CurrencyViewHolder holder, int position) {



        final  BureauRateObject br = itemList.get(position);
        holder.bureauname.setText(br.getBureau_name());
        holder.rates.setText(br.getBuysell());

        final String BureauId = br.getBureau_id();
        final String BureauName = br.getBureau_name();




        holder.root.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

               Intent i = new Intent(context, SingleForexActivity.class);
               // i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                i.putExtra("bureau_id", BureauId);
                i.putExtra("bureau_name",BureauName);
                context.startActivity(i);

            }
        });



    }

这是错误来自：

android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
                      at android.app.ContextImpl.startActivity(ContextImpl.java:677)
                      at android.app.ContextImpl.startActivity(ContextImpl.java:664)
                      at android.content.ContextWrapper.startActivity(ContextWrapper.java:331)
                      at Adapters.CurrencySelectorAdapter$1.onClick(CurrencySelectorAdapter.java:64)
                      at android.view.View.performClick(View.java:5265)
                      at android.view.View$PerformClick.run(View.java:21534)
                      at android.os.Handler.handleCallback(Handler.java:815)
                      at android.os.Handler.dispatchMessage(Handler.java:104)
                      at android.os.Looper.loop(Looper.java:207)
                      at android.app.ActivityThread.main(ActivityThread.java:5728)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)

我尝试了这个解决方案，但是下一个活动没有回到之前的活动。

I tried out this solution , but the Next Activity doesn't goes back to the previous Activity.

我的解决方案:(但没有用）

i.setFlags（Intent.FLAG_ACTIVITY_NEW_TASK）;

以下是整个适配器代码：

Below is the entire Adapter code:

    package Adapters;

import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.example.naavanito.eamobileforex2.R;
import com.example.naavanito.eamobileforex2.SingleForexActivity;

import java.util.Currency;
import java.util.List;

import Holders.CurrencyViewHolder;
import model.BureauRateObject;

/**
 * Created by Admin on 1/21/2017.
 */

public class CurrencySelectorAdapter extends RecyclerView.Adapter<CurrencyViewHolder> {

    private List<BureauRateObject> itemList;
    private Context context;

    public CurrencySelectorAdapter(List<BureauRateObject> itemList, Context context) {
        this.itemList = itemList;
        this.context = context;
    }

    @Override
    public CurrencyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View layoutview = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_currency_rate,parent,false);
        CurrencyViewHolder rcv = new CurrencyViewHolder(layoutview,context);
        return rcv;
    }

    @Override
    public void onBindViewHolder(CurrencyViewHolder holder, int position) {



        final  BureauRateObject br = itemList.get(position);
        holder.bureauname.setText(br.getBureau_name());
        holder.rates.setText(br.getBuysell());

        final String BureauId = br.getBureau_id();
        final String BureauName = br.getBureau_name();




        holder.root.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

               Intent i = new Intent(context, SingleForexActivity.class);
               // i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                i.putExtra("bureau_id", BureauId);
                i.putExtra("bureau_name",BureauName);
                context.startActivity(i);

            }
        });



    }

    @Override
    public int getItemCount() {
        return itemList.size();
    }
}

推荐答案

您传递到 CurrencySelectorAdapter 构造函数的 Context 应为活动托管此 RecyclerView 。然后，你不会得到这个错误。

The Context that you pass into the CurrencySelectorAdapter constructor should be the Activity that hosts this RecyclerView. Then, you will not get this error.

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