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SwipeRefreshLayout簡介
SwipeRefrshLayout是Google官方更新的一個控件,可以實作下拉重新整理的效果,該控件內建自ViewGroup在support-v4相容包下.
在android源碼中,主要是在聯系人界面重新整理聯系人資料:
packages/apps/Contacts/src/com/android/contacts/list/DefaultContactBrowseListFragment.java
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和檔案夾應用的檔案顯示界面:
packages/apps/DocumentsUI/src/com/android/documentsui/dirlist/DirectoryFragment.java
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Demo
主要實作下拉SwipeRefrshLayout控件,重新整理listview控件的資料.
(1) 布局檔案—activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:layout_marginBottom="20dp"
android:text="下拉重新整理控件樣例"/>
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="40dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@id/textView"
>
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</android.support.v4.widget.SwipeRefreshLayout>
</android.support.constraint.ConstraintLayout>
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(2)實作邏輯
public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener{
private final static String TAG = "MainActivity";
private SwipeRefreshLayout swipeRefreshLayout;
private TextView textView;
private ListView listview;
private ArrayAdapter<String> adapter;
private List<String> data;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
swipeRefreshLayout.setOnRefreshListener(this);
swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_bright,
android.R.color.holo_green_light, android.R.color.holo_orange_light,
android.R.color.holo_red_light);
textView = (TextView) findViewById(R.id.textView);
listview = (ListView) findViewById(R.id.listView);
data = new ArrayList<String>();
for (int i = 0; i < 5; i++) {
data.add("初始的item為:" + i);
}
adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, data);
listview.setAdapter(adapter);
}
public void showLoading() {
textView.setText("正在重新整理,請等待");
}
public void hideLoading() {
textView.setText("重新整理完畢!");
swipeRefreshLayout.setVisibility(View.VISIBLE);
swipeRefreshLayout.setRefreshing(false); // close refresh animator
}
@Override
public void onRefresh() {
Log.i(TAG,"onRefresh()");
showLoading();
final Random random = new Random();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
hideLoading();
int min=1;
int max=20;
Random random = new Random();
int num = random.nextInt(max)%(max-min+1) + min;
data.clear();
for(int i=0;i < num;i++){
data.add("重新整理後新增的item:"+i);
}
adapter.notifyDataSetChanged();
}
}, 5000);
}
}
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參考資料
1.Android零基礎入門|SwipeRefreshLayout下拉重新整理
http://www.sohu.com/a/195607552_619467
2.SwipeRefreshLayout + RecyclerView 實作 上拉重新整理 和 下拉重新整理
https://www.cnblogs.com/liunanjava/p/5860024.html
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