Liste <class> mit strings.xml

Question

Mit Android Studio begann ich mit einer Navigationsschublade Aktivität. Dann fügte ich eine Masterdetail-Aktivität hinzu und erstellte eine "echte" Klasse aus der DummyContent-Klassenvorlage. Die Anwendung funktioniert, wenn Sie die Elemente hart codieren. Ich muss mehrere Sprachen verwenden, daher muss ich strings.xml für die Sprachübersetzungen verwenden.

Ich erweiterte ProductsAZ.java mit Aktivität versucht erfolglos, "this" und "getString()" zu verwenden. Ich kann String header1 = getString (R.string.header1); Wie verwende ich dieses Design/diese Klasse, um Strings von strings.xml beim Hinzufügen eines neuen Product Items aufzurufen?

  addItem(new Product("1", "1_Title_here", "1_Header_here", "1_Body_here")); 
      addItem(new Product("2", "2_Title_here", "2_Header_here", "2_Body_here")); 
      addItem(new Product("3", "3_Title_here", "3_Header_here", "3_Body_here")); 

Wunsch ist:

 addItem(new Product("1", "@string/1_Title_here", "@string/1_Header_here", "@string/1_Body_here")); 

ProductAZ.java

import android.app.Activity; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 


public class ProductAZ extends Activity { 

     // An array of items. 
     // public static List<Product> ITEMS = new ArrayList<>(); 
     public static List<Product> ITEMS = new ArrayList<>(); 

     // A map of items, by ID. 
     public static Map<String, Product> ITEM_MAP = new HashMap<>(); 

      // Add items. 
      static { 
       addItem(new Product("1", "1_Title_here", "1_Header_here", "1_Body_here")); 
       addItem(new Product("2", "2_Title_here", "2_Header_here", "2_Body_here")); 
       addItem(new Product("3", "3_Title_here", "3_Header_here", "3_Body_here")); 
      } 

     private static void addItem(Product product) { 
      ITEMS.add(product); 
      ITEM_MAP.put(product.id, product); 
     } 

     // An item representing a piece of content. 
     public static class Product { 
      public final String id; 
      public final String title; 
      public final String header; 
      public final String details; 

      public Product(String id, String title, String header, String details) { 
       this.id = id; 
       this.title = title; 
       this.header = header; 
       this.details = details; 
      } 

      @Override 
      public String toString() { 
       return title; 
      } 
     } 
} 

ProductListActivity.java

import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.annotation.NonNull; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.RecyclerView; 
import android.support.v7.widget.Toolbar; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 
import android.support.v4.app.NavUtils; 
import android.support.v7.app.ActionBar; 
import android.view.MenuItem; 

import java.util.List; 

/** 
* An activity representing a list of Products. This activity 
* has different presentations for handset and tablet-size devices. On 
* handsets, the activity presents a list of items, which when touched, 
* lead to a {@link ProductDetailActivity} representing 
* item details. On tablets, the activity presents the list of items and 
* item details side-by-side using two vertical panes. 
*/ 
public class ProductListActivity extends AppCompatActivity { 

    /** 
    * Whether or not the activity is in two-pane mode, i.e. running on a tablet 
    * device. 
    */ 
    private boolean mTwoPane; 

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

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     toolbar.setTitle(getTitle()); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 
     // Show the Up button in the action bar. 
     ActionBar actionBar = getSupportActionBar(); 
     if (actionBar != null) { 
      actionBar.setDisplayHomeAsUpEnabled(true); 
     } 

     View recyclerView = findViewById(R.id.product_list); 
     assert recyclerView != null; 
     setupRecyclerView((RecyclerView) recyclerView); 

     if (findViewById(R.id.product_detail_container) != null) { 
      // The detail container view will be present only in the 
      // large-screen layouts (res/values-w900dp). 
      // If this view is present, then the 
      // activity should be in two-pane mode. 
      mTwoPane = true; 
     } 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     int id = item.getItemId(); 
     if (id == android.R.id.home) { 
      // This ID represents the Home or Up button. In the case of this 
      // activity, the Up button is shown. Use NavUtils to allow users 
      // to navigate up one level in the application structure. For 
      // more details, see the Navigation pattern on Android Design: 
      // 
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back 
      // 
      NavUtils.navigateUpFromSameTask(this); 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    private void setupRecyclerView(@NonNull RecyclerView recyclerView) { 
     recyclerView.setAdapter(new SimpleItemRecyclerViewAdapter(ProductAZ.ITEMS)); 
    } 

    public class SimpleItemRecyclerViewAdapter 
      extends RecyclerView.Adapter<SimpleItemRecyclerViewAdapter.ViewHolder> { 

     private final List<ProductAZ.Product> mValues; 

     public SimpleItemRecyclerViewAdapter(List<ProductAZ.Product> items) { 
      mValues = items; 
     } 

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

     @Override 
     public void onBindViewHolder(final ViewHolder holder, int position) { 
      holder.mItem = mValues.get(position); 
      holder.mIdView.setText(mValues.get(position).id); 
      holder.mContentView.setText(mValues.get(position).title); 

      holder.mView.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        if (mTwoPane) { 
         Bundle arguments = new Bundle(); 
         arguments.putString(ProductDetailFragment.ARG_ITEM_ID, holder.mItem.id); 
         ProductDetailFragment fragment = new ProductDetailFragment(); 
         fragment.setArguments(arguments); 
         getSupportFragmentManager().beginTransaction() 
           .replace(R.id.product_detail_container, fragment) 
           .commit(); 
        } else { 
         Context context = v.getContext(); 
         Intent intent = new Intent(context, ProductDetailActivity.class); 
         intent.putExtra(ProductDetailFragment.ARG_ITEM_ID, holder.mItem.id); 

         context.startActivity(intent); 
        } 
       } 
      }); 
     } 

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

     public class ViewHolder extends RecyclerView.ViewHolder { 
      public final View mView; 
      public final TextView mIdView; 
      public final TextView mContentView; 
      public ProductAZ.Product mItem; 

      public ViewHolder(View view) { 
       super(view); 
       mView = view; 
       mIdView = (TextView) view.findViewById(R.id.id); 
       mContentView = (TextView) view.findViewById(R.id.content); 
      } 

      @Override 
      public String toString() { 
       return super.toString() + " '" + mContentView.getText() + "'"; 
      } 
     } 
    } 
} 

ProductDetailFragment.java

import android.app.Activity; 
import android.support.design.widget.CollapsingToolbarLayout; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 

/** 
* A fragment representing a single Product detail screen. 
* This fragment is either contained in a {@link ProductListActivity} 
* in two-pane mode (on tablets) or a {@link ProductDetailActivity} 
* on handsets. 
*/ 
public class ProductDetailFragment extends Fragment { 
    /** 
    * The fragment argument representing the item ID that this fragment 
    * represents. 
    */ 
    public static final String ARG_ITEM_ID = "item_id"; 

    // The content this fragment is presenting. 
    // private ProductAZ.Product mItem; 
    private ProductAZ.Product mProduct; 

    /** 
    * Mandatory empty constructor for the fragment manager to instantiate the 
    * fragment (e.g. upon screen orientation changes). 
    */ 
    public ProductDetailFragment() { 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     if (getArguments().containsKey(ARG_ITEM_ID)) { 
      // Load the content specified by the fragment 
      // arguments. In a real-world scenario, use a Loader 
      // to load content from a content provider. 
      mProduct = ProductAZ.ITEM_MAP.get(getArguments().getString(ARG_ITEM_ID)); 

      Activity activity = this.getActivity(); 
      CollapsingToolbarLayout appBarLayout = (CollapsingToolbarLayout) activity.findViewById(R.id.toolbar_layout); 
      if (appBarLayout != null) { 
       appBarLayout.setTitle(mProduct.title); 
      } 
     } 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.product_detail, container, false); 

     // Show the content as text in a TextView. 
     if (mProduct != null) { 
      ((TextView) rootView.findViewById(R.id.product_detail)).setText(mProduct.details); 
     } 

     return rootView; 
    } 
} 

ProductDetailActivity.java

import android.content.Intent; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.app.ActionBar; 
import android.support.v4.app.NavUtils; 
import android.view.MenuItem; 

/** 
* An activity representing a single Product detail screen. This 
* activity is only used narrow width devices. On tablet-size devices, 
* item details are presented side-by-side with a list of items 
* in a {@link ProductListActivity}. 
*/ 
public class ProductDetailActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_product_detail); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.detail_toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own detail action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 

     // Show the Up button in the action bar. 
     ActionBar actionBar = getSupportActionBar(); 
     if (actionBar != null) { 
      actionBar.setDisplayHomeAsUpEnabled(true); 
     } 

     // savedInstanceState is non-null when there is fragment state 
     // saved from previous configurations of this activity 
     // (e.g. when rotating the screen from portrait to landscape). 
     // In this case, the fragment will automatically be re-added 
     // to its container so we don't need to manually add it. 
     // For more information, see the Fragments API guide at: 
     // 
     // http://developer.android.com/guide/components/fragments.html 
     // 
     if (savedInstanceState == null) { 
      // Create the detail fragment and add it to the activity 
      // using a fragment transaction. 
      Bundle arguments = new Bundle(); 
      arguments.putString(ProductDetailFragment.ARG_ITEM_ID, 
        getIntent().getStringExtra(ProductDetailFragment.ARG_ITEM_ID)); 
      ProductDetailFragment fragment = new ProductDetailFragment(); 
      fragment.setArguments(arguments); 
      getSupportFragmentManager().beginTransaction() 
        .add(R.id.product_detail_container, fragment) 
        .commit(); 
     } 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     int id = item.getItemId(); 
     if (id == android.R.id.home) { 
      // This ID represents the Home or Up button. In the case of this 
      // activity, the Up button is shown. Use NavUtils to allow users 
      // to navigate up one level in the application structure. For 
      // more details, see the Navigation pattern on Android Design: 
      // 
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back 
      // 
      NavUtils.navigateUpTo(this, new Intent(this, ProductListActivity.class)); 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

product_detail.xml

<TextView xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:id="@+id/product_detail" 
      style="?android:attr/textAppearanceLarge" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:padding="16dp" 
      android:textIsSelectable="true" 
      tools:context="com.bobh.znd6.ProductDetailFragment"/> 

product_list.xml (kleines Display)

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android" 
             xmlns:app="http://schemas.android.com/apk/res-auto" 
             xmlns:tools="http://schemas.android.com/tools" 
             android:id="@+id/product_list" 
             android:name="com.bobh.znd5.ProductListFragment" 
             android:layout_width="match_parent" 
             android:layout_height="match_parent" 
             android:layout_marginLeft="16dp" 
             android:layout_marginRight="16dp" 
             app:layoutManager="LinearLayoutManager" 
             tools:context="com.bobh.znd6.ProductListActivity" 
             tools:listitem="@layout/product_list_content"/> 

product_list_content.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:orientation="horizontal"> 

    <TextView 
     android:id="@+id/id" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_margin="@dimen/text_margin" 
     android:textAppearance="?attr/textAppearanceListItem"/> 

    <TextView 
     android:id="@+id/content" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_margin="@dimen/text_margin" 
     android:textAppearance="?attr/textAppearanceListItem"/> 
</LinearLayout> 

Answer 1

Gelöst. Ich fand die Lösung in link. Ich musste meine switch-Anweisung in ProductAZ.java löschen. Dann habe ich in DetailListActivity.java die Methode onCreate bearbeitet. Unter Verwendung der Umriss des Standes der Polschelle meiner Klasse/Methode:

protected void onCreate (Bundle savedInstanceState) {

super.onCreate(savedInstanceState); 

if (DummyContent.ITEMS.isEmpty()) 
{ 
    DummyContent.addItem(new DummyItem("1", getResources().getString(R.string.menu1))); 
    DummyContent.addItem(new DummyItem("2", getResources().getString(R.string.menu2))); 
    DummyContent.addItem(new DummyItem("3", getResources().getString(R.string.menu3))); 
}