android -各類適配器

參考文章:http://blog.csdn.net/a_large_swan/article/details/7535337

數據源不一樣而已
1. String[]: ArrayAdapter
2. List<Map<String,?>>: SimpleAdapter
3. 數據庫Cursor: SimpleCursorAdapter

第一種參考

若是僅僅將數組的內容顯示到ListView 上ArrayAdapter就夠了
public classTest extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        String[] sw = new String[10];
        for (int i = 0; i < 10; i++) {
            sw[i] = "List_" + i;
        }
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,sw);//使用系統已經實現好的xml文件simple_list_item_1
        setListAdapter(adapter);
    }
}

大概就是這三種，第一種的話必定要是string[]數組才能夠，不能用ArrayList<string>，須要轉換一下才能夠使用。

寫一下第二種用法:

一，mainActivity.class

1，數組類型：

ArrayList<HashMap<String,Object>>

2，適配器類型

SimpleAdapter

/**第一個參數：context

第二個參數：數組

第三個參數：適配器樣式佈局

第四個參數：hashmap中須要顯示出來的key值

第五個參數：適配器樣式佈局中與hashmap中須要顯示出來的key值對應的控件

//顯示分類列表
        listItem=getALLlist();
        SimpleAdapter listadapet=new SimpleAdapter(sortlist_java.this,
        listItem,
        R.layout.list_adapter,
        new String[]{"image","task_type"},
       new int[]{R.id.imageView2,R.id.textView3});

2、

R.layout.list_adapter界面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
    android:layout_height="45dp"
    android:background="@color/white"

    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".MainActivity">


    <ImageView
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:id="@+id/imageView2"
        android:background="@drawable/type_two"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="10dp"
        android:layout_alignBottom="@+id/textView3"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textView3"
        android:textSize="20dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginBottom="5dp"
        android:layout_marginLeft="30dp"
        android:layout_marginTop="15dp" />


</LinearLayout>

3、數組取值問題：

ArrayList<HashMap<String,Object>>

//獲取數據庫的全部待辦信息到List
    public ArrayList<HashMap<String,Object>>   getALLlist_todo() {
        MySqliteHelper mySqliteHelper=new MySqliteHelper(this,"mydata.db",null,1);  //mydata.db的數據庫
        ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String , Object>>();
        SQLiteDatabase db = mySqliteHelper.getReadableDatabase();
        Cursor c = db.query("my_table", new String[]{"_id", "task", "date", "task_type","cycle_time","remark","state","done_time"}, null, null, null, null, null);

        if (c != null) {
            while (c.moveToNext()) {
                HashMap<String, Object> item = new HashMap<String, Object>();

                if(c.getString(c.getColumnIndex("state")).equals("todo")) {
                    item.put("_id", c.getInt(c.getColumnIndex("_id")));
                    item.put("task", c.getString(c.getColumnIndex("task")));
                    item.put("date", c.getString(c.getColumnIndex("date")));
                    item.put("task_type", c.getString(c.getColumnIndex("task_type")));
                    item.put("cycle_time", c.getString(c.getColumnIndex("cycle_time")));
                    item.put("remark", c.getString(c.getColumnIndex("remark")));
                    item.put("state", c.getString(c.getColumnIndex("state")));
                    item.put("done_time",c.getString(c.getColumnIndex("done_time")));
                    item.put("image", R.drawable.quan1);



                    list.add(item);

                }

            }
        }
        c.close();
        return list;
    }