Question

我正在尝试显示配方的步骤，配方存储在字符串数组中。

我试图将每个步骤插入到文本视图中，并使用以下代码：

public class MethodActivity extends ListActivity{

ListView recipes;
Intent myIntent;
String value;
TextView editvalue;
Intent intent;

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


    setContentView(R.layout.recipemethod);

    editvalue = (TextView)findViewById(R.id.method);
    value = getIntent().getStringExtra("searchValue");
    editvalue.setText(value);

    final String[]  words = getResources().getStringArray(R.array.Lasagna);
    final TextView tw=(TextView)findViewById(R.id.method);
    for(int item = 0;item<words.length;item++){
        tw.setText(words [item]);
    }
  }
}

我也想让它变得动态，所以有谁知道我能做到这一点？（例如，取决于用户点击该配方的内容）。

谢谢

Answer 1

实际使用ListActivity的{{1}}可能更容易......您甚至可以在另一个ListView中显示您的食谱，因为它对用户来说无疑更直观...

执行此操作的简单代码将在以下几行中进行：

文件1：RecipeListActivity.java（显示食谱列表）

ListView

文件2：RecipeActivity.java（在列表中显示配方）

package com.epichorns.testproject;

import java.util.ArrayList;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;


public class RecipeListActivity extends ListActivity {

    final Recipe[] mRecipesArray = {    new Recipe("Lasagna", new String[]{"Some lasagna noodles", "Some tomato sauce"}),
                                        new Recipe("PortalCake", new String[]{"GlaDOS' wit","Is a lie"}),
                                        new Recipe("EarthDestruction", new String[]{"Asteroid", "Kinetic energy"})};


    public class Recipe{
        public String name;
        public String[] steps;

        Recipe(String name, String[] steps){
            this.name = name;
            this.steps = steps;
        }
    }

    public ArrayList<String> FetchRecipesRawArray(Recipe[] recipes){
        ArrayList<String> ret = new ArrayList<String>();
        for(int i=0;i<recipes.length;i++){
            ret.add(recipes[i].name);
        }
        return ret;
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);    

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, FetchRecipesRawArray(mRecipesArray));
        setListAdapter(adapter); 
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id){
        Intent intent = new Intent(this, RecipeActivity.class);
        intent.putExtra(RecipeActivity.EXTRA_RECIPEARRAY, mRecipesArray[position].steps);
        startActivity(intent);

    }
}

或者，这是一个代码，它在食谱列表下面合成TextView，以便在不打开另一个活动的情况下显示食谱内容：

文件：RecipeListActivity.java

package com.epichorns.testproject;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;


public class RecipeActivity extends ListActivity {
    final static public String EXTRA_RECIPEARRAY = "recipeArray";

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

        String[] recipeArray = getIntent().getStringArrayExtra(EXTRA_RECIPEARRAY);
        if(recipeArray!=null){
            if(recipeArray.length>0){
                ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, recipeArray);
                setListAdapter(adapter);
            }
        }
    }
}

文件：main.xml

package com.epichorns.testproject;

import java.util.ArrayList;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;


public class RecipeListActivity extends ListActivity {

    final Recipe[] mRecipesArray = {    new Recipe("Lasagna", new String[]{"Some lasagna noodles", "Some tomato sauce"}),
                                        new Recipe("PortalCake", new String[]{"GlaDOS' wit","Is a lie"}),
                                        new Recipe("EarthDestruction", new String[]{"Asteroid", "Kinetic energy"})};

    TextView mTextView_recipeTitle;
    TextView mTextView_recipe;


    public class Recipe{
        public String name;
        public String[] steps;

        Recipe(String name, String[] steps){
            this.name = name;
            this.steps = steps;
        }
    }

    public ArrayList<String> FetchRecipesRawArray(Recipe[] recipes){
        ArrayList<String> ret = new ArrayList<String>();
        for(int i=0;i<recipes.length;i++){
            ret.add(recipes[i].name);
        }
        return ret;
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);    

        setContentView(R.layout.main);
        mTextView_recipe = (TextView)findViewById(R.id.recipeText);
        mTextView_recipeTitle = (TextView)findViewById(R.id.recipeTitle);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, FetchRecipesRawArray(mRecipesArray));
        setListAdapter(adapter); 
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id){

        mTextView_recipeTitle.setText(mRecipesArray[position].name);

        mTextView_recipe.setText("");

        String[] recipeSteps = mRecipesArray[position].steps;
        for(int i=0;i<recipeSteps.length;i++){
            mTextView_recipe.append(recipeSteps[i]+"\n");
        }

    }
}

Answer 2

您将需要使用tw.append（）而不是setText，否则您将看到的是数组中的最后一个字符串。

让它变得动态，我会使用片段（使用Android支持库，如果在较旧的Android版本上）模型，加载每个数组，在启动之前将字符串数组作为包附加到片段。

Fragment tut：http://developer.android.com/guide/topics/fundamentals/fragments.html
支持库：http://developer.android.com/training/basics/fragments/support-lib.html

Android：还有另一种方法来显示字符串数组中的数据吗？

2 个答案: