Android后退按钮不适用于多个活动

Question

我是android的新手。

我有three activities A,B and C。

In the activity B我有一个listView列表中的item.On click每个项目我想要显示item details in the third activity.It工作正常。

但是，当在模拟器中单击第三个活动的后退按钮时，它向我显示我的应用程序已停止工作。

我无法重定向到第二个活动。

但from the second activity我能来back to the first activity。

我该如何解决这个问题？

在活动C中

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_display);
        Intent intent = getIntent();
        Bundle extras = intent.getExtras();
        String displayTitle = extras.getString("title");
        String displayPrice = extras.getString("price");
        String BasicInfo = extras.getString("BasicInfo");
        try {
            BasicInfoobj = new JSONObject(BasicInfo);
        } catch (JSONException e) {
            e.printStackTrace();
        }

        txtTitle = (TextView)findViewById(R.id.display_txtTitle);
        txtPrice = (TextView)findViewById(R.id.display_txtPrice);
        txtLocation =(TextView)findViewById(R.id.display_txtLocation);
        txtTitle.setText(displayTitle);
        txtPrice.setText(displayPrice);

    }

在活动B中

private class myListAdapter extends ArrayAdapter<Items> {
        public myListAdapter()
        {
            super(ResultActivity.this,R.layout.item_view,itemList);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            String CurrentImage="";
            View itemView = convertView;
            if(itemView == null)
            {
                itemView = getLayoutInflater().inflate(R.layout.item_view,parent,false);
            }

            //populate the list
            //find the item to work with
            final Items CurrentItem = itemList.get(position);
            //fill the view

            TextView title =(TextView)itemView.findViewById(R.id.txt_imageTitle);
            title.setText(CurrentItem.GetItemTitle());

            CurrentImage = CurrentItem.GetImgUrl();
            ImageView imageView = (ImageView)itemView.findViewById(R.id.item_icon);
            new ImageLoadTask(CurrentImage, imageView).execute();

            TextView Price =(TextView)itemView.findViewById(R.id.txt_itemPrice);
            Price.setText(CurrentItem.GetPrice());

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

                    Intent intent = new Intent(ResultActivity.this,DisplayActivity.class);
                    Bundle extras = new Bundle();
                    extras.putString("title",CurrentItem.GetItemTitle());
                    extras.putString("price",CurrentItem.GetPrice());
                    extras.putString("basicURL",CurrentItem.GetImgUrl());
                    extras.putString("ImageUrl",CurrentItem.GetImgSuperUrl());
                    extras.putString("BasicInfo",CurrentItem.GetBasicInfo().toString());
                    extras.putString("SellerInfo",CurrentItem.GetSellerInfo().toString());
                    extras.putString("ShippingInfo",CurrentItem.GetShippingInfo().toString());
                    intent.putExtras(extras);
                    startActivity(intent);
                }
            });

            return itemView;
            //return super.getView(position, convertView, parent);
        }
    }

Answer 1

在活动C中添加适当的代码

@Override
public void onBackPressed() 
{
    super.onBackPressed();
    moveTaskToBack(true);
}

试试这个

Answer 2

将其添加到您的活动中。

@Override
public void onBackPressed() 
{
    super.onBackPressed();
    finish();
}