動態添加列表視圖(ListView)的內容

本範例先創建一個空的陣列適配器(ArrayAdapter), 它是一個列表視圖(ListView)的適配器(Adapter). 然後動態添加它的內容.

package com.AndroidDynList;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

public class AndroidDynList extends Activity {

EditText input;
Button add, clear;
ListView listview;
ArrayAdapter<String> MyArrayAdapter;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      input = (EditText)findViewById(R.id.input);
   add = (Button)findViewById(R.id.add);
   clear = (Button)findViewById(R.id.clear);
   listview = (ListView)findViewById(R.id.list);
  
   MyArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
   listview.setAdapter(MyArrayAdapter);
  
   add.setOnClickListener(addOnClickListener);
   clear.setOnClickListener(clearOnClickListener);
  }

  private Button.OnClickListener addOnClickListener
  = new Button.OnClickListener(){

 @Override
 public void onClick(View arg0) {
  // TODO Auto-generated method stub
  String newInput = input.getText().toString();
  MyArrayAdapter.add(newInput);
          MyArrayAdapter.notifyDataSetChanged();
 }};

    private Button.OnClickListener clearOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   MyArrayAdapter.clear();
            MyArrayAdapter.notifyDataSetChanged();
  }};
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<EditText
  android:id="@+id/input"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
<Button
  android:id="@+id/add"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Add"
  />
<Button
  android:id="@+id/clear"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Clear"
  />
<ListView
  android:id="@+id/list"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
</LinearLayout>

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