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ListView Implementation

ListView

"ListView" is a view group that displays a list of scrollable items. The list items are automatically inserted to the list using an "Adapter" that pulls content from a source such as an array or database query and converts each item result into a view that's placed into the list.

ArrayAdapter 範例

ListView- 定義 ArrayList

ListView listView = (ListView) findViewById(R.id.hello_listview);
ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("listview1");
arrayList.add("listview2");
arrayList.add("listview3");
arrayList.add("listview4");
arrayList.add("listview5");
arrayList.add("listview6");

ListView- Set Adapter

//利用字串陣列製作 Adapter ，顯示樣式為 android.R.layout.simple_list_item_1。
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                ListviewActivity.this,
                android.R.layout.simple_list_item_1, mArrayList);
//將 Adapter 放進元件中，設定資料來源。
mListVeiw.setAdapter(adapter);

利用onItemClickListener方便顯示

mListVeiw.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(ListviewActivity.this, mArrayList.get(position),
                    Toast.LENGTH_SHORT).show();
            }
        });

notifyDataSetChanged 更新內容

//設定按鈕，按下後更新 ListView 內容。
Button  listviewButton= (Button) findViewById(R.id.listview_btn);
listviewButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        // 修改陣列內容
        mArrayList.set(0,"Liao");
        // 通知資料被變動，更新 ListView 顯示內容。
        adapter.notifyDataSetChanged();
    }
});

ScrollView

Test3

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