android 自定义ListView下拉刷新控件——自定义控件学习（五）

android 自定义ListView下拉刷新控件——自定义控件学习（五）

android的ListView使用的时候经常需要做一个下拉刷新的功能。这样的功能可能需要的很多，如果每次都重新做一遍的话，有点麻烦了，所以，这里把这个功能制作成一个控件，如果对这个控件的实现有兴趣，可以参考：android
ListView下拉刷新。

好了，下面上货：

1、首先是重要的CustomerListViewPullDownRefreshAndPageLoad.java

package com.example.administrator.customerpulldownrefreshandpageload;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

/**
* Created by Administrator on 2016-09-27.
*/
public class CustomerListViewPullDownRefreshAndPageLoad extends RelativeLayout{
private final String TAG = CustomerListViewPullDownRefreshAndPageLoad.class.getSimpleName();
private final int MSG_CODE = 0x994;
private ListView listView;
private ArrayAdapter<String> adapter;
private ViewGroup.MarginLayoutParams marginLayoutParams;
private ViewGroup.MarginLayoutParams marginLayoutParamspro;

//上方的存放图标和文字的LinearLayout
private LinearLayout linearLayout;
//在上方存档的内容包括以下的imageView progressBar textView
private ImageView imageArrow;
private ProgressBar progressBar;
private TextView textViewTip;

private final int MARGIN_TOP = -200;

private boolean pullFlag;
private boolean returnFlag;
//刷新完成标志
private boolean refreshFinishFlag;

private int oldY;
private int newY;
private int distance;

//线程
public Thread tempThead;
//接口
public interface refreshEvent{
void refresh();
}

private refreshEvent refreshEvent;

public CustomerListViewPullDownRefreshAndPageLoad(Context context, AttributeSet attrs) {
super(context, attrs);
listView = new ListView(getContext());
RelativeLayout.LayoutParams relayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
relayoutParams.setMargins(0,0,0,0);
listView.setLayoutParams(relayoutParams);
listView.setBackgroundColor(getResources().getColor(android.R.color.white));
addView(listView);

linearLayout = new LinearLayout(getContext());
RelativeLayout.LayoutParams lilayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lilayoutParams.setMargins(0,MARGIN_TOP,0,0);
linearLayout.setOrientation(LinearLayout.HORIZONTAL);
// linearLayout.setBackgroundColor(getResources().getColor(android.R.color.holo_red_dark));
linearLayout.setGravity(Gravity.CENTER);
linearLayout.setLayoutParams(lilayoutParams);
addView(linearLayout);

imageArrow = new ImageView(getContext());
imageArrow.setImageResource(R.drawable.arrowdown);
LinearLayout.LayoutParams imglayoutParams = new LinearLayout.LayoutParams(100,100);
imageArrow.setLayoutParams(imglayoutParams);
linearLayout.addView(imageArrow);

progressBar = new ProgressBar(getContext());
LinearLayout.LayoutParams prolayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
progressBar.setProgressDrawable(getResources().getDrawable(android.R.drawable.progress_indeterminate_horizontal));
progressBar.setLayoutParams(prolayoutParams);
linearLayout.addView(progressBar);

textViewTip = new TextView(getContext());
LinearLayout.LayoutParams texlayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
texlayoutParams.setMargins(20,0,0,0);
textViewTip.setText("正在刷新...");
textViewTip.setTextSize(20);
textViewTip.setLayoutParams(texlayoutParams);
linearLayout.addView(textViewTip);

pullFlag = false;
returnFlag = false;
refreshFinishFlag = true;

oldY = 0;
newY = 0;
distance = 0;
marginLayoutParams = (ViewGroup.MarginLayoutParams) listView.getLayoutParams();
marginLayoutParamspro = (ViewGroup.MarginLayoutParams) linearLayout.getLayoutParams();

//设置滑动事件
listView.setOnTouchListener(new MyOnTouch());
}

//滑动事件
class MyOnTouch implements View.OnTouchListener {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
View firstChild = listView.getChildAt(0);
if (firstChild != null) {
//当前第一个是第几项
int firstChildPosition = listView.getFirstVisiblePosition();
//第一项的坐标为0
int firstChildTop = firstChild.getTop();
if (firstChildPosition == 0 && firstChildTop == 0 && refreshFinishFlag) {
pullFlag = true;
Log.i(TAG, "---->ACTION_DOWNpullFlag" + String.valueOf(pullFlag));
}
Log.i(TAG, "---->ACTION_DOWN" + String.valueOf(firstChildPosition));
Log.i(TAG, "---->ACTION_DOWN" + String.valueOf(firstChildTop));
}
returnFlag = false;
Log.i(TAG, "---->ACTION_DOWN");
oldY = (int) event.getRawY(); distance = 0;
break;
case MotionEvent.ACTION_MOVE:
newY = (int) event.getRawY();
distance = newY - oldY;
if (pullFlag && distance > 0) {
returnFlag = true;
marginLayoutParams.topMargin = distance / 2;
listView.setLayoutParams(marginLayoutParams);
if (distance < 300) {
//正在下拉
downStatus();
marginLayoutParamspro.topMargin = (distance / 2) - 100;
linearLayout.setLayoutParams(marginLayoutParamspro);
//防止强迫症，拉完有放回来
refreshFinishFlag = true;
} else {
//下拉大于150，能够执行刷新动作
//更新标志位，为完成下拉
refreshFinishFlag = false;
//显示释放
upStatus();
}
}
break;
case MotionEvent.ACTION_UP:
Log.i(TAG, "---->ACTION_UP");
if (pullFlag) {
if (distance < 300) {
//下拉没有到位释放
marginLayoutParams.topMargin = 0;
//隐藏上边的部分
marginLayoutParamspro.topMargin = MARGIN_TOP;
linearLayout.setLayoutParams(marginLayoutParamspro);
} else {
marginLayoutParams.topMargin = 200;
//显示正在刷新
refreshingStatus();
//下拉到位释放，启动刷新线程
tempThead = new Thread(){
@Override
public void run() {
super.run();
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.obtainMessage(MSG_CODE).sendToTarget();
}
};
tempThead.start();
}
listView.setLayoutParams(marginLayoutParams);
}
pullFlag = false;
returnFlag = false;
break;
}
//true时listview不能进行滑动,false时能够进行滑动
return returnFlag;
}
}

public void downStatus(){
imageArrow.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
imageArrow.setImageResource(R.drawable.arrowdown);
textViewTip.setText("下拉刷新...");
}
public void upStatus(){
imageArrow.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
imageArrow.setImageResource(R.drawable.arrowup);
textViewTip.setText("释放刷新...");
}
public void refreshingStatus(){
imageArrow.setVisibility(View.GONE);
progressBar.setVisibility(View.VISIBLE);
textViewTip.setText("正在刷新...");
}

public void setAdapter(ArrayAdapter<String> adapter) {
this.adapter = adapter;
listView.setAdapter(adapter);
}
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == MSG_CODE){
Toast.makeText(getContext(), "刷新完成", Toast.LENGTH_SHORT).show();
refreshFinishFlag = true;
//插入刷新事件
refreshEvent.refresh();
//隐藏上边的部分
marginLayoutParamspro.topMargin = MARGIN_TOP;
linearLayout.setLayoutParams(marginLayoutParamspro);
//隐藏刷新界面
marginLayoutParams.topMargin = 0;
listView.setLayoutParams(marginLayoutParams);
}
}
};

public void setRefreshEvent(CustomerListViewPullDownRefreshAndPageLoad.refreshEvent refreshEvent) {
this.refreshEvent = refreshEvent;
}
}

2、需要的资源：



是两张图片，用来显示下拉和松开。

3、调用，首先是布局文件：

<?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"
tools:context="com.example.administrator.customerpulldownrefreshandpageload.MainActivity">
<com.example.administrator.customerpulldownrefreshandpageload.CustomerListViewPullDownRefreshAndPageLoad
android:layout_width="match_parent"
android:background="@android:color/darker_gray"
android:id="@+id/customListView"
android:layout_height="match_parent"></com.example.administrator.customerpulldownrefreshandpageload.CustomerListViewPullDownRefreshAndPageLoad>
</RelativeLayout>

4、调用，MainActivity.java

package com.example.administrator.customerpulldownrefreshandpageload;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class MainActivity extends AppCompatActivity implements CustomerListViewPullDownRefreshAndPageLoad.refreshEvent {
private CustomerListViewPullDownRefreshAndPageLoad customerListViewPullDownRefreshAndPageLoad;
private List<String> data;
private ArrayAdapter<String> adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
customerListViewPullDownRefreshAndPageLoad = (CustomerListViewPullDownRefreshAndPageLoad) this.findViewById(R.id.customListView);
data = new ArrayList<String>();
for (int i = 0; i < 30; i++) {
data.add("测试数据" + i);
}
adapter = new ArrayAdapter<String>(this, R.layout.simple_list, R.id.simple_list_textview, data);
customerListViewPullDownRefreshAndPageLoad.setAdapter(adapter);
customerListViewPullDownRefreshAndPageLoad.setRefreshEvent(this);
}

@Override
public void refresh() {
data.clear();
Random random = new Random();
for (int i = 0; i < 30; i++) {
data.add("测试数据" + String.valueOf(random.nextInt(100) + 1));
}
adapter.notifyDataSetChanged();
}

@Override
protected void onDestroy() {
customerListViewPullDownRefreshAndPageLoad.tempThead.stop();
super.onDestroy();
}
}

注意：1、在MainActivity.java中需要实现refreshEvent接口，在接口中的refresh方法中写你的刷新操作。

   2、一定要记得在onDestroy中关闭子线程。

5、你可能需要的资源：



simple_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@color/colorAccent"
android:textSize="50sp"
android:id="@+id/simple_list_textview"/>
</LinearLayout>

下面是运行结果：







最后附上代码：点我下载，不要你的积分哦！！！