Question

以下类用于显示xml文件中包含的一组字符串。在onCreate方法中，从资源文件中提取字符串数组。这些字符串是一组可笑的笑话，它们被添加到Joke对象（m_arrJokeList）的ArrayList中，从字符串构造。

在onCreate方法中调用的addJoke方法旨在将这些笑话作为文本显示在滚动视图中。但是，这些似乎都不适用于我的设备或模拟器，因此代码肯定存在问题。我想知道如何解决这个问题以及如何使用这些视图的一些技巧。

以下是代码未完全实施。

package edu.calpoly.android.lab2;
import java.util.ArrayList;
    import android.app.Activity;
    import android.content.Context;
    import android.content.res.Resources;
    import android.os.Bundle;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.LinearLayout;
    import android.widget.ScrollView;
    import android.widget.TextView;
    import android.widget.Toast;

    public class SimpleJokeList extends Activity {

        // Contains the list Jokes the Activity will present to the user
        protected ArrayList<Joke> m_arrJokeList;

        // LinearLayout used for maintaining a list of Views that each display Jokes
        protected LinearLayout m_vwJokeLayout;

        // EditText used for entering text for a new Joke to be added to m_arrJokeList.
        protected EditText m_vwJokeEditText;

        // Button used for creating and adding a new Joke to m_arrJokeList using the
        // text entered in m_vwJokeEditText.
        protected Button m_vwJokeButton;

        // Background Color values used for alternating between light and dark rows
        // of Jokes.  
        protected int m_nDarkColor;
        protected int m_nLightColor;

        @Override
        public void onCreate(Bundle savedInstance) {
            super.onCreate(savedInstance);
            initLayout();
            Resources localRsrc;
            localRsrc = this.getResources();
            ArrayList<Joke> jokeList = new ArrayList<Joke>(); 
            String[] jokeStrings = localRsrc.getStringArray(R.array.jokeList);

            int size = jokeStrings.length;
            Joke tempJoke = new Joke();
            for(int i=0;i < size;i++)
            {
                tempJoke.setJoke(jokeStrings[i]);
                jokeList.add(tempJoke);
                addJoke(tempJoke);
            }
        }


        // Method used to encapsulate the code that initializes and sets the Layout
        // for this Activity. 
        protected void initLayout() {
            // TODO
            //LinearLayout rootLayout;
            m_arrJokeList = new ArrayList<Joke>();
            m_vwJokeLayout = new LinearLayout(this); // why pass "this"
            m_vwJokeLayout.setOrientation(LinearLayout.VERTICAL);

            ScrollView extendedView = new ScrollView(this.getApplicationContext());
            extendedView.addView(m_vwJokeLayout);
            setContentView(extendedView);

        }

        // Method used to encapsulate the code that initializes and sets the Event
        // Listeners which will respond to requests to "Add" a new Joke to the list. 
        protected void initAddJokeListeners() {
            // TODO
        }

        // Method used for encapsulating the logic necessary to properly initialize
        // a new joke, add it to m_arrJokeList, and display it on screen. 
        // @param strJoke
        //            A string containing the text of the Joke to add.
        protected void addJoke(Joke jk) {
            m_arrJokeList.add(jk);
            TextView textJoke = new TextView(this);
            textJoke.setText(jk.getJoke());
            m_vwJokeLayout.addView(textJoke);
        }
    }

Answer 1

把

Joke tempJoke = new Joke();

in for loop

for(int i=0;i < size;i++) 
{ 
  Joke tempJoke = new Joke(); 
  tempJoke.setJoke(jokeStrings[i]); 
  jokeList.add(tempJoke); 
  addJoke(tempJoke); 
}

然后试试吧。让我知道会发生什么。

Android scrollview不显示字符串

1 个答案: