情境
現在要使用下拉更新, 其實很方便,
google推出的下拉更新, 讓你在操作上更有彈性。
程式碼說明
新建立一個專案, 修改xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.widget.SwipeRefreshLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/refresh_layout">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:text="@string/hello_world"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</ScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
**會發現裡面要包一個ScrollView不然無法捲動,
或者內部要包一個可以滑動的View(eg. ListView)。**
接著主程式
public class MainActivity extends Activity {
private SwipeRefreshLayout mSwipeRefreshLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.refresh_layout);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
mSwipeRefreshLayout.setRefreshing(false);
}
});
}
}
註冊OnRefreshListener並且覆寫SwipeRefreshLayout的onRefresh方法,
當下滑到手指放開, 則會進行更新, 更新完畢後, 則將loading icon關閉。