我想在點擊後退按鈕後將數據保存在列表視圖中，並在按下查看按鈕後查看它。但我沒有看到它

-2

我在主要活動中有一個RecyclerView，並且在recyclerview的每個片段上都有一個按鈕。當我點擊那個按鈕時，數據就會被添加到另一個活動的列表視圖中。而且我的操作欄上有一個按鈕，當我點擊該按鈕時只想看到列表視圖。提前致謝。我MainAcitivity代碼如下：我想在點擊後退按鈕後將數據保存在列表視圖中，並在按下查看按鈕後查看它。但我沒有看到它

public class MainActivity extends AppCompatActivity { 
    RecyclerView recyclerView; 
    RecyclerView.Adapter adapter; 
    RecyclerView.LayoutManager layoutManager; 

// ArrayList<Integer> images; 
// ArrayList<String> imageNames, contents; 
    public static int[] images = {R.drawable.bengalithali,R.drawable.chikanthali,R.drawable.eggthali, R.drawable.gujratithali, 
      R.drawable.maharstrianthali, R.drawable.keralathali, R.drawable.rajsthanithali, R.drawable.tamilthali}; 
    public static String[] imageNames = {"Bengali Thali","Chikan Thali", "Egg Thali", "Gujrathi Thali", "Maharashtrian Thali", "Kerala Thali", 
          "Rajsthani Thali", "Tamil Thali"}; 
    public static String[] contents = {"As seen in Pic","As seen in Pic","As seen in Pic","As seen in Pic","As seen in Pic","As seen in Pic", 
      "As seen in Pic","As seen in Pic"}; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     recyclerView = (RecyclerView) findViewById(R.id.recycler_view); 

//  images = new ArrayList<>(); 
//  images.add(R.drawable.bengalithali); 
//  images.add(R.drawable.chikanthali); 
//  images.add(R.drawable.eggthali); 
//  images.add(R.drawable.gujratithali); 
//  images.add(R.drawable.maharstrianthali); 
//  images.add(R.drawable.keralathali); 
//  images.add(R.drawable.rajsthanithali); 
//  images.add(R.drawable.tamilthali); 
// 
//  imageNames = new ArrayList<>(); 
//  imageNames.add("Bengali Thali"); 
//  imageNames.add("Chikan Thali"); 
//  imageNames.add("Egg Thali"); 
//  imageNames.add("Gujrathi Thali"); 
//  imageNames.add("Maharashtrian Thali"); 
//  imageNames.add("Kerala Thali"); 
//  imageNames.add("Rajsthani Thali"); 
//  imageNames.add("Tamil Thali"); 
// 
//  contents = new ArrayList<>(); 
//  contents.add("As seen in Pic"); 
//  contents.add("As seen in Pic"); 
//  contents.add("As seen in Pic"); 
//  contents.add("As seen in Pic"); 
//  contents.add("As seen in Pic"); 
//  contents.add("As seen in Pic"); 
//  contents.add("As seen in Pic"); 
//  contents.add("As seen in Pic"); 


     adapter = new RecyclerAdapter(MainActivity.this,images, imageNames, contents); 

     layoutManager = new LinearLayoutManager(this); 
     recyclerView.setLayoutManager(layoutManager); 
     recyclerView.setHasFixedSize(true); 
     recyclerView.setAdapter(adapter); 


    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.action_button,menu); 
     return super.onCreateOptionsMenu(menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 

     Intent intent = new Intent(MainActivity.this, MyCartList.class); 
     startActivity(intent); 
     return super.onOptionsItemSelected(item); 
    } 



}

我Recyclerview適配器代碼如下：公共類RecyclerAdapter擴展

RecyclerView.Adapter<RecyclerAdapter.RecyclerViewHolder> { 


    String[] imageNames, contents; 
    int[] images; 
    Context context; 

    public RecyclerAdapter(Context context,int[] images,String[] imageNames,String[] contents) { 
     this.images = images; 
     this.imageNames = imageNames; 
     this.contents = contents; 
     this.context = context; 
    } 

    @Override 
     public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_items, parent, false); 
     RecyclerViewHolder rvh = new RecyclerViewHolder(view); 
     return rvh; 
    } 

    @Override 
     public void onBindViewHolder(RecyclerViewHolder holder, int position) { 
     holder.productImage.setFitsSystemWindows(true); 
     holder.productImage.setImageResource(images[position]); 
     holder.productName.setText(imageNames[position]); 
     holder.productContent.setText(contents[position]); 

    } 

    @Override 
    public int getItemCount() { 
     return images.length; 
    } 

    public class RecyclerViewHolder extends RecyclerView.ViewHolder{ 
     ImageView productImage; 
     TextView productName, productContent, quantity; 
     CircleButton plusButton, minusButton; 
     FButton addToCartButton; 

     public RecyclerViewHolder(final View itemView) { 
      super(itemView); 

      productImage = (ImageView) itemView.findViewById(R.id.product_image); 
      productName = (TextView) itemView.findViewById(R.id.product_name); 
      productContent = (TextView) itemView.findViewById(R.id.product_content); 
      plusButton = (CircleButton) itemView.findViewById(R.id.plus_button); 
      minusButton = (CircleButton) itemView.findViewById(R.id.minus_button); 
      quantity = (TextView) itemView.findViewById(R.id.show_quantity); 
      addToCartButton = (FButton) itemView.findViewById(R.id.add_button); 


      plusButton.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        int Quantity = Integer.parseInt(quantity.getText().toString()); 
        quantity.setText(String.valueOf(Quantity+1)); 
        if (Quantity == 10 && plusButton.isClickable()){ 
         quantity.setText("10"); 
        } 
       } 
      }); 

      minusButton.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        int Quantity = Integer.parseInt(quantity.getText().toString()); 
        quantity.setText(String.valueOf(Quantity-1)); 
        if (Quantity == 0 && minusButton.isClickable()){ 
         quantity.setText("0"); 
        } 
       } 
      }); 

      addToCartButton.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 

        Intent intent = new Intent(context, MyCartList.class); 
//     Bundle bundle = new Bundle(); 
//     bundle.putString("KEYONE",imageNames[getAdapterPosition()]); 
//     bundle.putString("KEYTWO", contents[getAdapterPosition()]); 
//     intent.putExtras(bundle); 

        intent.putExtra("KEYONE", imageNames[getAdapterPosition()]); 
        intent.putExtra("KEYTWO", contents[getAdapterPosition()]); 
        view.getContext().startActivity(intent); 
        Toast.makeText(context, ""+imageNames[getAdapterPosition()]+ "\n"+ contents[getAdapterPosition()], Toast.LENGTH_SHORT).show(); 


       } 
      }); 
     } 

    } 
}

我CartList活動代碼如下：

public class MyCartList extends AppCompatActivity { 

    ListView myList = null; 
    MyListViewAdapter myListViewAdapter; 
    public static ArrayList<String> c = new ArrayList<>(); 
    public static ArrayList<String> d = new ArrayList<>(); 

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_my_cart_list); 

     Intent i = getIntent(); 
     String a = i.getStringExtra("KEYONE"); 
     String b = i.getStringExtra("KEYTWO"); 

     c.add(a); 
     d.add(b); 

     myList = (ListView) findViewById(R.id.my_list_view); 
     myListViewAdapter = new MyListViewAdapter(MyCartList.this,c,d); 
     myList.setAdapter(myListViewAdapter); 

    } 
}

我的列表視圖適配器代碼如下：

public class MyListViewAdapter extends BaseAdapter{ 
    Context mContext; 
    public static ArrayList<String> thaliNames, thaliContent; 
    SharedPreferences sharedPreferences; 

    public MyListViewAdapter(Context context,ArrayList<String> thaliNames, ArrayList<String> thaliContent) { 
     this.mContext = context; 
     this.thaliNames = thaliNames; 
     this.thaliContent = thaliContent; 

    } 

    @Override 
    public int getCount() { 
     return thaliNames.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return position; 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View view = inflater.inflate(R.layout.my_list, null); 


     TextView listItem = (TextView) view.findViewById(R.id.my_product_name); 
     listItem.setText(thaliNames + "\n" + thaliContent); 
     return view; 
    } 
}

activity_main.xml中如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.gaurya.carttask.MainActivity" 
    android:scrollbars="vertical"> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/recycler_view" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:scrollbars="vertical"> 

    </android.support.v7.widget.RecyclerView> 
</RelativeLayout>

list_tems.xml如下：

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:orientation="horizontal" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 
    <com.makeramen.roundedimageview.RoundedImageView 
     android:id="@+id/product_image" 
     android:layout_width="150dp" 
     android:layout_height="200dp" 
     app:riv_border_color="@android:color/holo_red_dark" 
     app:riv_corner_radius="30dip" 
     app:riv_border_width="2dip" 
     app:riv_mutate_background="true" 
     app:riv_tile_mode="repeat" 
     app:riv_oval="true"/> 
    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="200dp" 
     android:orientation="vertical"> 

     <TextView 
      android:id="@+id/product_name" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="15dp" 
      android:layout_marginLeft="20dp" 
      android:text="Name" 
      android:textSize="20sp"/> 
     <TextView 
      android:id="@+id/product_content" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginTop="10dp" 
      android:layout_marginLeft="20dp" 
      android:text="Name" 
      android:textSize="15sp"/> 
     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="horizontal"> 

      <at.markushi.ui.CircleButton 
       android:id="@+id/plus_button" 
       android:layout_width="40dip" 
       android:layout_height="40dip" 
       android:layout_marginTop="25dp" 
       android:layout_marginLeft="15dp" 
       app:cb_color="#64daed" 
       android:src="@drawable/plus" 
       /> 

      <TextView 
       android:id="@+id/show_quantity" 
       android:layout_width="40sp" 
       android:layout_height="40sp" 
       android:layout_marginTop="25dp" 
       android:text="0" 
       android:gravity="center" 
       android:textSize="30sp" 
       android:padding="5dp" 
       android:layout_marginLeft="10dp"/> 

      <at.markushi.ui.CircleButton 
       android:id="@+id/minus_button" 
       android:layout_width="40dip" 
       android:layout_height="40dip" 
       android:layout_marginTop="25dp" 
       app:cb_color="#64daed" 
       android:src="@drawable/negative" 
       android:layout_marginLeft="10dp"/> 

     </LinearLayout> 

     <info.hoang8f.widget.FButton 
      android:id="@+id/add_button" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:text="add to cart" 
      app:shadowEnabled="true" 
      app:shadowHeight="5dp" 
      app:cornerRadius="15dp" 
      android:layout_marginTop="17dp"/> 


    </LinearLayout> 


</LinearLayout>

activity_my_cart_list.xml如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_my_cart_list" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.gaurya.carttask.MyCartList"> 
    <ListView 
     android:id="@+id/my_list_view" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:scrollbars="vertical"> 

    </ListView> 

</RelativeLayout>

my_list.xml是如下：

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:id="@+id/my_product_name" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" /> 

</LinearLayout>

來源

2016-11-22 Guarav w

發佈您的代碼只是不給你的問題。請明確說明你做了什麼以及你如何需要它以及你出錯的地方。 –

在我的代碼中，其標籤上有一個recyclerview，其中有一個添加到購物車按鈕。當我點擊那個按鈕時，我只想要那個選項卡的名稱和內容會轉到另一個活動的列表視圖。但我不想在點擊按鈕上看到它。我想看到另一個按鈕上的列表，它位於我的操作欄上。就像在線購物應用程序一樣，我們將該項目添加到購物車，但無法看到它。但我們可以點擊購物車看到它。謝謝 –

最簡單的方法是，您可以創建一個可以容納元素列表的公共類，您可以隨時訪問它。

利用String對象

public static class MyListHolder{ 

static List<String> lstOfObj; 

public Static MyListHolder(){ 
    lstOfObj = new ArrayList<String>(); 
} 

public static void addNewObject(String object){ 
    lstOfObj.add(object); 
} 

public static List<String> getMyObjList(){ 
    return lstOfObj; 
} 
}

現在你可以使用這個類&方法來管理對象的列表範例。

來源

2016-11-22 12:12:17 GreenRobo

我想在點擊後退按鈕後將數據保存在列表視圖中，並在按下查看按鈕後查看它。但我沒有看到它

回答

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