android - 子ビューを膨らませる方法は?

Question

レイアウトの特定のセクションを膨張させようとしていますが、コンパイルエラーが発生し、どのようなアプローチをとればよいかわかりません。特に次の行で -

LinearLayout childList = (LinearLayout)findViewById(R.id.listLayout). 
//(This can be found near the bottom of Java code.)

を膨らませようとするときに正しいアプローチを取っているかどうかもわかりませんlistLayout。

この段階で、ボタンを一番上に置き、その下の配列内のアイテムのリストを動的に膨らませようとしています。

どんな助けでも大歓迎です

XML

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

    <Button
        android:id="@+id/labelAddCourseButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:onClick="addCourseButton"
        android:padding="10dp"
        android:text="@string/CourseName" />

    <LinearLayout
    android:id="@+id/listLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >     

    <TextView
        android:id="@+id/labelModuleCode"
        android:layout_height="wrap_content"
         android:layout_width="wrap_content"
         android:layout_marginLeft="10dp"
        android:text="@string/CourseName"
        android:textSize="10dp" />

     <TextView
        android:id="@+id/labelCourseType"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/CourseType"
        android:layout_marginLeft="10dp"
        android:textSize="10dp" />

    </LinearLayout>

</LinearLayout>

ジャワ

package com.example.mycoursetimetable;

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

public class MyCourses extends ListActivity {

    static final String TEST = "com.example.mycoursetimetable.TEST";
    String [] MODULE;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_courses);
        MODULE = getResources().getStringArray(R.array.module);
        setListAdapter(new ListArrayAdapter(this,MODULE));
    }

    public void addCourseButton (View addCourseButton) 
    {
        Intent intent = new Intent(this,AddCourse.class);
        startActivity(intent);
    }

    public void onListItemClick(ListView l, View v, int position, long id)
    {
        super.onListItemClick(l, v, position, id);

        try {
        Class test = Class.forName("com.example.MyCourseTimeTable.AddCourse");
        Intent intent = new Intent(MyCourses.this, test);

        TextView textView = (TextView) v.findViewById(R.id.labelModuleCode);
        String module = textView.getText().toString();

        intent.putExtra(TEST,module);
        startActivity(intent);
        }   
        catch (ClassNotFoundException e)
        {
        e.printStackTrace();
        }             
    }    
}

class ListArrayAdapter extends ArrayAdapter<String> 
{
    //Context allows the retrieval of resources such as layout
    private final Context context;
    private final String[] test;

    //create the ArrayAdpater
    public ListArrayAdapter(Context context, String[] test) 
    {
        super(context, R.layout.activity_my_courses, test);
        this.context = context;
        this.test = test;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        //inflater  dynamically loads the layout

        LinearLayout childList = (LinearLayout)findViewById(R.id.listLayout);
        View rowView = inflater.inflate(R.layout.childList, parent, false);

        //get the textView
        TextView textView = (TextView) rowView.findViewById(R.id.labelModuleCode);
        //set the text to the string values based on position
        textView.setText(test[position]);

        // Change item based on its position in the string array
        String modulePosition = test[position];             

        //return the layout
        return rowView;
    }
}

score 1 · Accepted Answer

getView()以下のように編集してみてください。

       @Override
        public View getView(int position, View convertView, ViewGroup parent) 
        {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      //inflater  dynamically loads the layout

        LinearLayout childList = (LinearLayout)findViewById(R.id.listLayout);
        convertView = inflater.inflate(R.layout.childList, null);

        //get the textView
        TextView textView = (TextView) convertView.findViewById(R.id.labelModuleCode);
        //set the text to the string values based on position
        textView.setText(test[position]);

        // Change item based on its position in the string array
        String modulePosition = test[position];



        //return the layout
        return convertView;
        }

自分のビューではなく、getView()のビューを使用してください。convertViewrowView

score 0 · Accepted Answer

これがあなたが望むかもしれないものの例です。私が ViewHolder やその他のトリックを使用している理由については、Android の Romain Guyがアダプターと効率について話しているのを見てください。

class ListArrayAdapter extends ArrayAdapter<String> 
{
    //  You only need one copy of LayoutInflater
    private final LayoutInflater inflater;

    //create the ArrayAdpater
    public ListArrayAdapter(Context context, String[] test) 
    {
        // The layout here doesn't really matter since we don't use it
        super(context, R.layout.childList, test);
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {
        ViewHolder holder;
        if(convertView == null) {
            // Inflate the layout that you want for each row
            convertView = inflater.inflate(R.layout.childList, parent, false);

            holder = new ViewHolder();
            holder.code = (TextView) convertView.findViewById(R.id.labelModuleCode);
            holder.type = (TextView) convertView.findViewById(R.id.labelModuleType);

            // Add a reference in ViewHolder for your Button, find it like the TextViews and define its OnClickListener here too, eventually...

            convertView.setTag(holder);
        }
        else 
            holder = (ViewHolder) convertView.getTag();

        String module = getItem(position);
        //set the text to the string values based on position
        holder.code.setText(module);

        //return the layout
        return convertView;
    }

    class ViewHolder {
        TextView code;
        TextView type;
    }
}

android - 子ビューを膨らませる方法は?

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