【Android - 框架】之刷新加载框架Ultra-Pull-To-Refresh的使用
Ultra-Pull-To-Refresh框架是用来嵌套其他布局,实现下拉刷新和上拉加载的框架。它其中可以嵌套任何控件,ListView、GridView、ScrollView、RecyclerView,甚至TextView。
这个框架在GitHub上的地址:【Ultra-Pull-To-Refresh-With-Load-More】。
(1)首先需要导入框架依赖:
// Ultra-Pull-To-Refresh框架的依赖 compile 'in.srain.cube:ptr-load-more:1.0.6'
(2)在XML文件中使用:
<?xml version="1.0" encoding="utf-8"?> <!-- ptr:ptr_duration_to_close_either:头部和底部回弹时间 ptr:ptr_keep_header_when_refresh:刷新过程中是否保留头部 ptr:ptr_pull_to_fresh:下拉刷新/释放刷新,默认是释放刷新 ptr:ptr_ratio_of_header_height_to_refresh:触发刷新时移动的位置比例,指的是与头部的比例 ptr:ptr_resistance:阻尼系数,越大下拉越吃力 --> <in.srain.cube.views.ptr.PtrClassicFrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:ptr="http://schemas.android.com/apk/res-auto" android:id="@+id/ptr_layout" android:layout_width="match_parent" android:layout_height="match_parent" ptr:ptr_duration_to_close_either="1000" ptr:ptr_keep_header_when_refresh="true" ptr:ptr_pull_to_fresh="false" ptr:ptr_ratio_of_header_height_to_refresh="1.2" ptr:ptr_resistance="1.7"> <ListView android:id="@+id/id_main_lv_lv" android:layout_width="match_parent" android:layout_height="match_parent" /> </in.srain.cube.views.ptr.PtrClassicFrameLayout>
(3)MainActivity中的代码:
package com.example.itgungnir.testultraptr; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.ArrayAdapter; import android.widget.ListView; import java.util.ArrayList; import java.util.List; import in.srain.cube.views.ptr.PtrClassicFrameLayout; import in.srain.cube.views.ptr.PtrDefaultHandler2; import in.srain.cube.views.ptr.PtrFrameLayout; public class MainActivity extends AppCompatActivity { private PtrClassicFrameLayout ptrLayout; private ListView lv; private ArrayAdapter<String> adapter; private List<String> dataSource; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ptrLayout = (PtrClassicFrameLayout) findViewById(R.id.ptr_layout); lv = (ListView) findViewById(R.id.id_main_lv_lv); } @Override protected void onResume() { super.onResume(); initData(); initView(); initEvent(); } /** * 初始化数据 */ private void initData() { // 初始化ListView中展示的数据 dataSource = new ArrayList<>(); for (int i = 1; i <= 50; i++) { dataSource.add("Existed Old List Item " + i); } } /** * 初始化布局控件 */ private void initView() { // 初始化ListView中的数据 adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, dataSource); lv.setAdapter(adapter); // 为布局设置头部和底部布局 ptrLayout.setHeaderView(new MyPtrRefresher(MainActivity.this)); // ptrLayout.setFooterView(new MyPtrRefresher(MainActivity.this)); ptrLayout.addPtrUIHandler(new MyPtrHandler(MainActivity.this, ptrLayout)); } /** * 初始化事件 */ private void initEvent() { // 为布局设置下拉刷新和上拉加载的回调事件 ptrLayout.setPtrHandler(new PtrDefaultHandler2() { @Override public void onLoadMoreBegin(PtrFrameLayout frame) { // 上拉加载的回调方法 frame.postDelayed(new Runnable() { @Override public void run() { dataSource.add("New Bottom List Item"); adapter.notifyDataSetChanged(); ptrLayout.refreshComplete(); lv.smoothScrollToPosition(dataSource.size() - 1); } }, 1000); } @Override public void onRefreshBegin(PtrFrameLayout frame) { // 下拉刷新的回调方法 frame.postDelayed(new Runnable() { @Override public void run() { dataSource.add(0, "New Top List Item"); adapter.notifyDataSetChanged(); ptrLayout.refreshComplete(); lv.smoothScrollToPosition(0); } }, 1000); } }); } }
(4)头部和尾部布局MyPtrRefresher中的代码:
public class MyPtrRefresher extends LinearLayout { public MyPtrRefresher(Context context) { super(context, null); LayoutInflater.from(context).inflate(R.layout.view_ptrrefresher, this); } public MyPtrRefresher(Context context, AttributeSet attrs) { super(context, attrs, 0); LayoutInflater.from(context).inflate(R.layout.view_ptrrefresher, this); } public MyPtrRefresher(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); LayoutInflater.from(context).inflate(R.layout.view_ptrrefresher, this); } }
(5)头部和尾部的布局文件:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="70.0dip" android:background="#DDDDDD" android:gravity="center" android:orientation="horizontal" android:padding="20.0dip"> <ImageView android:id="@+id/id_header_iv_img" android:layout_width="30.0dip" android:layout_height="30.0dip" android:background="@mipmap/ic_launcher" android:contentDescription="@string/app_name" android:scaleType="fitXY" /> <TextView android:id="@+id/id_header_tv_tip" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10.0dip" android:text="Loading......" android:textColor="#FF000000" android:textSize="16.0sp" android:textStyle="bold" /> </LinearLayout>
(6)刷新回调类MyPtrHandler中的代码:
package com.example.itgungnir.testultraptr; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import in.srain.cube.views.ptr.PtrFrameLayout; import in.srain.cube.views.ptr.PtrUIHandler; import in.srain.cube.views.ptr.indicator.PtrIndicator; /** * 为Ultra-Pull-To-Refresh设置事件回调 */ public class MyPtrHandler implements PtrUIHandler { private Context context; private ImageView img; private TextView tip; public MyPtrHandler(Context context, ViewGroup parent) { this.context = context; View view = LayoutInflater.from(context).inflate(R.layout.view_ptrrefresher, parent); this.img = (ImageView) view.findViewById(R.id.id_header_iv_img); this.tip = (TextView) view.findViewById(R.id.id_header_tv_tip); } @Override public void onUIReset(PtrFrameLayout frame) { } @Override public void onUIRefreshPrepare(PtrFrameLayout frame) { tip.setText("Pull To Refresh"); } @Override public void onUIRefreshBegin(PtrFrameLayout frame) { tip.setText("Loading......"); RotateAnimation animation = new RotateAnimation(0, 360, img.getPivotX(), img.getPivotY()); animation.setFillAfter(false); animation.setDuration(1000); animation.setRepeatMode(Animation.RESTART); img.startAnimation(animation); } @Override public void onUIRefreshComplete(PtrFrameLayout frame, boolean isHeader) { tip.setText("Load Complete"); Toast.makeText(context, "Load Complete!!", Toast.LENGTH_SHORT).show(); } @Override public void onUIPositionChange(PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) { } }
这个框架还可以有很多样式,如刷新时隐藏头部、iOS样式、自动刷新等等。更多样式参照GitHub中的源码。
posted on 2016-12-22 14:08 ITGungnir 阅读(4172) 评论(0) 编辑 收藏 举报