仿知乎下拉重新整理上拉自動載入

阿新 • • 發佈：2019-01-26

效果圖如下

activity_main.xml

<?xmlversion=“1.0”encoding=“utf-8”?>
<RelativeLayoutxmlns:android=“http://schemas.android.com/apk/res/android”
xmlns:tools=“http://schemas.android.com/tools”
android:layout_width=“match_parent”
android:layout_height=“match_parent”
android:paddingBottom

=“@dimen/activity_vertical_margin”
android:paddingLeft=“@dimen/activity_horizontal_margin”
android:paddingRight=“@dimen/activity_horizontal_margin”
android:paddingTop=“@dimen/activity_vertical_margin”
tools:context=“net.sytm.swiperefreshlayout.MainActivity”>
<android.support.v4.widget.SwipeRefreshLayout
android:layout_width=“match_parent”
android:layout_height=“match_parent”
android:id=“@+id/swipe_id”>
<net.sytm.widget.CustomerListView
android:layout_width=“match_parent”
android:layout_height=“match_parent”
android:id=“@+id/list_view_id”

/>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="net.sytm.swiperefreshlayout.MainActivity">


    <android.support.v4.widget.SwipeRefreshLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/swipe_id">

        <net.sytm.widget.CustomerListView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/list_view_id" />

    </android.support.v4.widget.SwipeRefreshLayout>

</RelativeLayout>

MainActivity.java [java] view plain copy print?

package net.sytm.swiperefreshlayout;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import net.sytm.widget.CustomerListView;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
publicclass MainActivity extends AppCompatActivity implements CustomerListView.Callback {
private MHandler mHandler;
private SwipeRefreshLayout refreshLayout;
private CustomerListView listView;
private List<String> list;
private ArrayAdapter<String> adapter;
@Override
protectedvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler = new MHandler(this);
initUI();
bindData();
}
privatevoid initUI() {
refreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_id);
refreshLayout.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);
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
publicvoid onRefresh() {
downData();
}
});
listView = (CustomerListView) findViewById(R.id.list_view_id);
listView.setCallback(this);
}
privatevoid bindData() {
list = new ArrayList<>();
for (int i = 0; i< 3; i++) {
list.add(String.valueOf(i));
}
adapter = new ArrayAdapter<>(this, android.R.layout.simple_expandable_list_item_1, list);
listView.setAdapter(adapter);
}
@Override
publicvoid downData() {
mHandler.sendEmptyMessageDelayed(0, 2000);
}
@Override
publicvoid loadData() {
mHandler.sendEmptyMessageDelayed(1, 2000);
}
staticclass MHandler extends Handler {
final WeakReference<MainActivity> activityWeakReference;
MHandler(MainActivity activity) {
this.activityWeakReference = new WeakReference<>(activity);
}
@Override
publicvoid handleMessage(Message msg) {
MainActivity activity = activityWeakReference.get();
if (activity == null) {
return;
}
switch (msg.what) {
case0:
activity.list.add(”hutao”);
activity.adapter.notifyDataSetChanged();
activity.refreshLayout.setRefreshing(false);
break;
case1:
activity.list.add(”php”);
activity.adapter.notifyDataSetChanged();
activity.listView.hideFootView();
break;
}
}
}
}

package net.sytm.swiperefreshlayout;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;

import net.sytm.widget.CustomerListView;

import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements CustomerListView.Callback {
    private MHandler mHandler;
    private SwipeRefreshLayout refreshLayout;
    private CustomerListView listView;
    private List<String> list;
    private ArrayAdapter<String> adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mHandler = new MHandler(this);
        initUI();
        bindData();
    }

    private void initUI() {
        refreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_id);
        refreshLayout.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);

        refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                downData();
            }
        });
        listView = (CustomerListView) findViewById(R.id.list_view_id);
        listView.setCallback(this);
    }

    private void bindData() {
        list = new ArrayList<>();
        for (int i = 0; i< 3; i++) {
            list.add(String.valueOf(i));
        }
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_expandable_list_item_1, list);
        listView.setAdapter(adapter);
    }

    @Override
    public void downData() {
        mHandler.sendEmptyMessageDelayed(0, 2000);
    }

    @Override
    public void loadData() {
        mHandler.sendEmptyMessageDelayed(1, 2000);
    }

    static class MHandler extends Handler {

       final WeakReference<MainActivity> activityWeakReference;

       MHandler(MainActivity activity) {
           this.activityWeakReference = new WeakReference<>(activity);
       }

       @Override
       public void handleMessage(Message msg) {
           MainActivity activity = activityWeakReference.get();
           if (activity == null) {
               return;
           }
           switch (msg.what) {
               case 0:
                   activity.list.add("hutao");
                   activity.adapter.notifyDataSetChanged();
                   activity.refreshLayout.setRefreshing(false);
                   break;
               case 1:
                   activity.list.add("php");
                   activity.adapter.notifyDataSetChanged();
                   activity.listView.hideFootView();
                   break;
           }

       }
    }
}

foot_view.xml [html] view plain copy print?

<?xmlversion=“1.0”encoding=“utf-8”?>
<LinearLayoutxmlns:android=“http://schemas.android.com/apk/res/android”
android:orientation=“horizontal”
android:layout_width=“match_parent”
android:layout_height=“match_parent”
android:gravity=“center”>
<ProgressBar
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
style=“@style/Widget.AppCompat.ProgressBar”/>
<TextView
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
android:text=“載入更多”
android:textColor=“@android:color/darker_gray”/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center">

    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="@style/Widget.AppCompat.ProgressBar"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="載入更多"
        android:textColor="@android:color/darker_gray"/>

</LinearLayout>

CustomerListView.java
[java] view plain copy print?

package net.sytm.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ListView;
import net.sytm.swiperefreshlayout.R;
/*
編碼人胡桃
日期 2016/7/25
/
publicclass CustomerListView extends ListView implements AbsListView.OnScrollListener {
private Context context;
private Callback callback;
private View footView;
public CustomerListView(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
initUI();
}
privatevoid initUI() {
footView = LayoutInflater.from(context).inflate(R.layout.foot_view, null);
footView.setVisibility(View.GONE);
this.addFooterView(footView);
this.setFooterDividersEnabled(false);
this.setOnScrollListener(this);
}
@Override
publicvoid onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE
&& this.getLastVisiblePosition() == this.getCount() - 1) {
footView.setVisibility(View.VISIBLE);
callback.loadData();
}
}
@Override
publicvoid onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
//int lastIndex = firstVisibleItem + visibleItemCount - 1 - 1;
}
publicvoid hideFootView() {
footView.setVisibility(View.GONE);
}
publicvoid setCallback(Callback callback) {
this.callback = callback;
}
publicinterface Callback {
void downData();
void loadData();
}
}

package net.sytm.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ListView;

import net.sytm.swiperefreshlayout.R;

/**
* 編碼人胡桃
* 日期 2016/7/25
*/
public class CustomerListView extends ListView implements AbsListView.OnScrollListener {

private Context context;
private Callback callback;
private View footView;


public CustomerListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.context = context;
    initUI();
}

private void initUI() {
    footView = LayoutInflater.from(context).inflate(R.layout.foot_view, null);
    footView.setVisibility(View.GONE);
    this.addFooterView(footView);
    this.setFooterDividersEnabled(false);
    this.setOnScrollListener(this);
}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
    if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE
            &amp;&amp;  this.getLastVisiblePosition() == this.getCount() - 1) {
        footView.setVisibility(View.VISIBLE);

        callback.loadData();
    }
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
    //int lastIndex = firstVisibleItem + visibleItemCount - 1 - 1;
}

public void hideFootView() {
    footView.setVisibility(View.GONE);
}

public void setCallback(Callback callback) {
    this.callback = callback;
}

public interface Callback {
    void downData();
    void loadData();
}

}

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