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Android自定義控件下拉刷新實(shí)例代碼

 更新時(shí)間:2016年10月12日 10:40:58   作者:西門吃雪  
這篇文章主要介紹了Android自定義控件下拉刷新實(shí)例代碼的相關(guān)資料,需要的朋友可以參考下

實(shí)現(xiàn)效果:

圖片素材:

--> 首先, 寫先下拉刷新時(shí)的刷新布局 pull_to_refresh.xml:

<resources>
  <string name="app_name">PullToRefreshTest</string>
  <string name="pull_to_refresh">下拉可以刷新</string>
  <string name="release_to_refresh">釋放立即刷新</string>
  <string name="refreshing">正在刷新...</string>
  <string name="not_updated_yet">暫未更新過</string>
  <string name="updated_at">上次更新于%1$s前</string>
  <string name="updated_just_now">剛剛更新</string>
  <string name="time_error">時(shí)間有問題</string>
</resources>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/pull_to_refresh_head"
  android:layout_width="match_parent"
  android:layout_height="60dp">
  <LinearLayout
    android:layout_width="200dp"
    android:layout_height="60dp"
    android:layout_centerInParent="true"
    android:orientation="horizontal">
    <RelativeLayout
      android:layout_width="0dp"
      android:layout_height="60dp"
      android:layout_weight="3">
      <ImageView
        android:id="@+id/arrow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@mipmap/indicator_arrow" />
      <ProgressBar
        android:id="@+id/progress_bar"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_centerInParent="true"
        android:visibility="gone" />
    </RelativeLayout>
    <LinearLayout
      android:layout_width="0dp"
      android:layout_height="60dp"
      android:layout_weight="12"
      android:orientation="vertical">
      <TextView
        android:id="@+id/description"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="center_horizontal|bottom"
        android:text="@string/pull_to_refresh" />
      <TextView
        android:id="@+id/updated_at"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="center_horizontal|top"
        android:text="@string/updated_at" />
    </LinearLayout>
  </LinearLayout>
</RelativeLayout>
strings
pull_to_refresh
--> 然后, 也是主要的, 自定義下拉刷新的 View (包含下拉刷新所有操作) RefreshView.java:
package com.dragon.android.tofreshlayout;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.SystemClock;
import android.preference.PreferenceManager;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
public class RefreshView extends LinearLayout implements View.OnTouchListener {
private static final String TAG = RefreshView.class.getSimpleName();
public enum PULL_STATUS {
STATUS_PULL_TO_REFRESH(0), // 下拉狀態(tài)
STATUS_RELEASE_TO_REFRESH(1), // 釋放立即刷新狀態(tài)
STATUS_REFRESHING(2), // 正在刷新狀態(tài)
STATUS_REFRESH_FINISHED(3); // 刷新完成或未刷新狀態(tài)
private int status; // 狀態(tài)
PULL_STATUS(int value) {
this.status = value;
}
public int getValue() {
return this.status;
}
}
// 下拉頭部回滾的速度
public static final int SCROLL_SPEED = -20;
// 一分鐘的毫秒值,用于判斷上次的更新時(shí)間
public static final long ONE_MINUTE = 60 * 1000;
// 一小時(shí)的毫秒值,用于判斷上次的更新時(shí)間
public static final long ONE_HOUR = 60 * ONE_MINUTE;
// 一天的毫秒值,用于判斷上次的更新時(shí)間
public static final long ONE_DAY = 24 * ONE_HOUR;
// 一月的毫秒值,用于判斷上次的更新時(shí)間
public static final long ONE_MONTH = 30 * ONE_DAY;
// 一年的毫秒值,用于判斷上次的更新時(shí)間
public static final long ONE_YEAR = 12 * ONE_MONTH;
// 上次更新時(shí)間的字符串常量,用于作為 SharedPreferences 的鍵值
private static final String UPDATED_AT = "updated_at";
// 下拉刷新的回調(diào)接口
private PullToRefreshListener mListener;
private SharedPreferences preferences; // 用于存儲(chǔ)上次更新時(shí)間
private View header; // 下拉頭的View
private ListView listView; // 需要去下拉刷新的ListView
private ProgressBar progressBar; // 刷新時(shí)顯示的進(jìn)度條
private ImageView arrow; // 指示下拉和釋放的箭頭
private TextView description; // 指示下拉和釋放的文字描述
private TextView updateAt; // 上次更新時(shí)間的文字描述
private MarginLayoutParams headerLayoutParams; // 下拉頭的布局參數(shù)
private long lastUpdateTime; // 上次更新時(shí)間的毫秒值
// 為了防止不同界面的下拉刷新在上次更新時(shí)間上互相有沖突,使用id來做區(qū)分
private int mId = -1;
private int hideHeaderHeight; // 下拉頭的高度
/**
* 當(dāng)前處理什么狀態(tài),可選值有 STATUS_PULL_TO_REFRESH, STATUS_RELEASE_TO_REFRESH, STATUS_REFRESHING 和 STATUS_REFRESH_FINISHED
*/
private PULL_STATUS currentStatus = PULL_STATUS.STATUS_REFRESH_FINISHED;
// 記錄上一次的狀態(tài)是什么,避免進(jìn)行重復(fù)操作
private PULL_STATUS lastStatus = currentStatus;
private float yDown; // 手指按下時(shí)的屏幕縱坐標(biāo)
private int touchSlop; // 在被判定為滾動(dòng)之前用戶手指可以移動(dòng)的最大值。
private boolean loadOnce; // 是否已加載過一次layout,這里onLayout中的初始化只需加載一次
private boolean ableToPull; // 當(dāng)前是否可以下拉,只有ListView滾動(dòng)到頭的時(shí)候才允許下拉
/**
* 下拉刷新控件的構(gòu)造函數(shù),會(huì)在運(yùn)行時(shí)動(dòng)態(tài)添加一個(gè)下拉頭的布局
*/
public RefreshView(Context context, AttributeSet attrs) {
super(context, attrs);
preferences = PreferenceManager.getDefaultSharedPreferences(context);
header = LayoutInflater.from(context).inflate(R.layout.pull_to_refresh, null, true);
progressBar = (ProgressBar) header.findViewById(R.id.progress_bar);
arrow = (ImageView) header.findViewById(R.id.arrow);
description = (TextView) header.findViewById(R.id.description);
updateAt = (TextView) header.findViewById(R.id.updated_at);
touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
refreshUpdatedAtValue();
setOrientation(VERTICAL);
addView(header, 0);
//Log.d(TAG, "RefreshView Constructor() getChildAt(0): " + getChildAt(0));
//Log.d(TAG, "RefreshView Constructor() getChildAt(0): " + getChildAt(1));
// listView = (ListView) getChildAt(1);
// listView.setOnTouchListener(this);
}
/**
* 進(jìn)行一些關(guān)鍵性的初始化操作,比如:將下拉頭向上偏移進(jìn)行隱藏,給 ListView 注冊 touch 事件
*/
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
if (changed && !loadOnce) {
hideHeaderHeight = -header.getHeight();
headerLayoutParams = (MarginLayoutParams) header.getLayoutParams();
headerLayoutParams.topMargin = hideHeaderHeight;
listView = (ListView) getChildAt(1);
//Log.d(TAG, "onLayout() getChildAt(0): " + getChildAt(0));
//Log.d(TAG, "onLayout() listView: " + listView);
listView.setOnTouchListener(this);
loadOnce = true;
}
}
/**
* 當(dāng) ListView 被觸摸時(shí)調(diào)用,其中處理了各種下拉刷新的具體邏輯
*/
@Override
public boolean onTouch(View v, MotionEvent event) {
setCanAbleToPull(event); // 判斷是否可以下拉
if (ableToPull) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
yDown = event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
// 獲取移動(dòng)中的 Y 軸的位置
float yMove = event.getRawY();
// 獲取從按下到移動(dòng)過程中移動(dòng)的距離
int distance = (int) (yMove - yDown);
// 如果手指是上滑狀態(tài),并且下拉頭是完全隱藏的,就屏蔽下拉事件
if (distance <= 0 && headerLayoutParams.topMargin <= hideHeaderHeight) {
return false;
}
if (distance < touchSlop) {
return false;
}
// 判斷是否已經(jīng)在刷新狀態(tài)
if (currentStatus != PULL_STATUS.STATUS_REFRESHING) {
// 判斷設(shè)置的 topMargin 是否 > 0, 默認(rèn)初始設(shè)置為 -header.getHeight()
if (headerLayoutParams.topMargin > 0) {
currentStatus = PULL_STATUS.STATUS_RELEASE_TO_REFRESH;
} else {
// 否則狀態(tài)為下拉中的狀態(tài)
currentStatus = PULL_STATUS.STATUS_PULL_TO_REFRESH;
}
// 通過偏移下拉頭的 topMargin 值,來實(shí)現(xiàn)下拉效果
headerLayoutParams.topMargin = (distance / 2) + hideHeaderHeight;
header.setLayoutParams(headerLayoutParams);
}
break;
case MotionEvent.ACTION_UP:
default:
if (currentStatus == PULL_STATUS.STATUS_RELEASE_TO_REFRESH) {
// 松手時(shí)如果是釋放立即刷新狀態(tài),就去調(diào)用正在刷新的任務(wù)
new RefreshingTask().execute();
} else if (currentStatus == PULL_STATUS.STATUS_PULL_TO_REFRESH) {
// 松手時(shí)如果是下拉狀態(tài),就去調(diào)用隱藏下拉頭的任務(wù)
new HideHeaderTask().execute();
}
break;
}
// 時(shí)刻記得更新下拉頭中的信息
if (currentStatus == PULL_STATUS.STATUS_PULL_TO_REFRESH
|| currentStatus == PULL_STATUS.STATUS_RELEASE_TO_REFRESH) {
updateHeaderView();
// 當(dāng)前正處于下拉或釋放狀態(tài),要讓 ListView 失去焦點(diǎn),否則被點(diǎn)擊的那一項(xiàng)會(huì)一直處于選中狀態(tài)
listView.setPressed(false);
listView.setFocusable(false);
listView.setFocusableInTouchMode(false);
lastStatus = currentStatus;
// 當(dāng)前正處于下拉或釋放狀態(tài),通過返回 true 屏蔽掉 ListView 的滾動(dòng)事件
return true;
}
}
return false;
}
/**
* 給下拉刷新控件注冊一個(gè)監(jiān)聽器
*
* @param listener 監(jiān)聽器的實(shí)現(xiàn)
* @param id 為了防止不同界面的下拉刷新在上次更新時(shí)間上互相有沖突,不同界面在注冊下拉刷新監(jiān)聽器時(shí)一定要傳入不同的 id
*/
public void setOnRefreshListener(PullToRefreshListener listener, int id) {
mListener = listener;
mId = id;
}
/**
* 當(dāng)所有的刷新邏輯完成后,記錄調(diào)用一下,否則你的 ListView 將一直處于正在刷新狀態(tài)
*/
public void finishRefreshing() {
currentStatus = PULL_STATUS.STATUS_REFRESH_FINISHED;
preferences.edit().putLong(UPDATED_AT + mId, System.currentTimeMillis()).commit();
new HideHeaderTask().execute();
}
/**
* 根據(jù)當(dāng)前 ListView 的滾動(dòng)狀態(tài)來設(shè)定 {@link #ableToPull}
* 的值,每次都需要在 onTouch 中第一個(gè)執(zhí)行,這樣可以判斷出當(dāng)前應(yīng)該是滾動(dòng) ListView,還是應(yīng)該進(jìn)行下拉
*/
private void setCanAbleToPull(MotionEvent event) {
View firstChild = listView.getChildAt(0);
if (firstChild != null) {
// 獲取 ListView 中第一個(gè)Item的位置
int firstVisiblePos = listView.getFirstVisiblePosition();
// 判斷第一個(gè)子控件的 Top 是否和第一個(gè) Item 位置相等
if (firstVisiblePos == 0 && firstChild.getTop() == 0) {
if (!ableToPull) {
// getRawY() 獲得的是相對屏幕 Y 方向的位置
yDown = event.getRawY();
}
// 如果首個(gè)元素的上邊緣,距離父布局值為 0,就說明 ListView 滾動(dòng)到了最頂部,此時(shí)應(yīng)該允許下拉刷新
ableToPull = true;
} else {
if (headerLayoutParams.topMargin != hideHeaderHeight) {
headerLayoutParams.topMargin = hideHeaderHeight;
header.setLayoutParams(headerLayoutParams);
}
ableToPull = false;
}
} else {
// 如果 ListView 中沒有元素,也應(yīng)該允許下拉刷新
ableToPull = true;
}
}
/**
* 更新下拉頭中的信息
*/
private void updateHeaderView() {
if (lastStatus != currentStatus) {
if (currentStatus == PULL_STATUS.STATUS_PULL_TO_REFRESH) {
description.setText(getResources().getString(R.string.pull_to_refresh));
arrow.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
rotateArrow();
} else if (currentStatus == PULL_STATUS.STATUS_RELEASE_TO_REFRESH) {
description.setText(getResources().getString(R.string.release_to_refresh));
arrow.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
rotateArrow();
} else if (currentStatus == PULL_STATUS.STATUS_REFRESHING) {
description.setText(getResources().getString(R.string.refreshing));
progressBar.setVisibility(View.VISIBLE);
arrow.clearAnimation();
arrow.setVisibility(View.GONE);
}
refreshUpdatedAtValue();
}
}
/**
* 根據(jù)當(dāng)前的狀態(tài)來旋轉(zhuǎn)箭頭
*/
private void rotateArrow() {
float pivotX = arrow.getWidth() / 2f;
float pivotY = arrow.getHeight() / 2f;
float fromDegrees = 0f;
float toDegrees = 0f;
if (currentStatus == PULL_STATUS.STATUS_PULL_TO_REFRESH) {
fromDegrees = 180f;
toDegrees = 360f;
} else if (currentStatus == PULL_STATUS.STATUS_RELEASE_TO_REFRESH) {
fromDegrees = 0f;
toDegrees = 180f;
}
RotateAnimation animation = new RotateAnimation(fromDegrees, toDegrees, pivotX, pivotY);
animation.setDuration(100);
animation.setFillAfter(true);
arrow.startAnimation(animation);
}
/**
* 刷新下拉頭中上次更新時(shí)間的文字描述
*/
private void refreshUpdatedAtValue() {
lastUpdateTime = preferences.getLong(UPDATED_AT + mId, -1);
long currentTime = System.currentTimeMillis();
long timePassed = currentTime - lastUpdateTime;
long timeIntoFormat;
String updateAtValue;
if (lastUpdateTime == -1) {
updateAtValue = getResources().getString(R.string.not_updated_yet);
} else if (timePassed < 0) {
updateAtValue = getResources().getString(R.string.time_error);
} else if (timePassed < ONE_MINUTE) {
updateAtValue = getResources().getString(R.string.updated_just_now);
} else if (timePassed < ONE_HOUR) {
timeIntoFormat = timePassed / ONE_MINUTE;
String value = timeIntoFormat + "分鐘";
updateAtValue = String.format(getResources().getString(R.string.updated_at), value);
} else if (timePassed < ONE_DAY) {
timeIntoFormat = timePassed / ONE_HOUR;
String value = timeIntoFormat + "小時(shí)";
updateAtValue = String.format(getResources().getString(R.string.updated_at), value);
} else if (timePassed < ONE_MONTH) {
timeIntoFormat = timePassed / ONE_DAY;
String value = timeIntoFormat + "天";
updateAtValue = String.format(getResources().getString(R.string.updated_at), value);
} else if (timePassed < ONE_YEAR) {
timeIntoFormat = timePassed / ONE_MONTH;
String value = timeIntoFormat + "個(gè)月";
updateAtValue = String.format(getResources().getString(R.string.updated_at), value);
} else {
timeIntoFormat = timePassed / ONE_YEAR;
String value = timeIntoFormat + "年";
updateAtValue = String.format(getResources().getString(R.string.updated_at), value);
}
updateAt.setText(updateAtValue);
}
/**
* 正在刷新的任務(wù),在此任務(wù)中會(huì)去回調(diào)注冊進(jìn)來的下拉刷新監(jiān)聽器
*/
class RefreshingTask extends AsyncTask<Void, Integer, Void> {
@Override
protected Void doInBackground(Void... params) {
int topMargin = headerLayoutParams.topMargin;
while (true) {
topMargin = topMargin + SCROLL_SPEED;
if (topMargin <= 0) {
topMargin = 0;
break;
}
publishProgress(topMargin);
SystemClock.sleep(10);
}
currentStatus = PULL_STATUS.STATUS_REFRESHING;
publishProgress(0);
if (mListener != null) {
mListener.onRefresh();
}
return null;
}
@Override
protected void onProgressUpdate(Integer... topMargin) {
updateHeaderView();
headerLayoutParams.topMargin = topMargin[0];
header.setLayoutParams(headerLayoutParams);
}
}
/**
* 隱藏下拉頭的任務(wù),當(dāng)未進(jìn)行下拉刷新或下拉刷新完成后,此任務(wù)將會(huì)使下拉頭重新隱藏
*/
class HideHeaderTask extends AsyncTask<Void, Integer, Integer> {
@Override
protected Integer doInBackground(Void... params) {
int topMargin = headerLayoutParams.topMargin;
while (true) {
topMargin = topMargin + SCROLL_SPEED;
if (topMargin <= hideHeaderHeight) {
topMargin = hideHeaderHeight;
break;
}
publishProgress(topMargin);
SystemClock.sleep(10);
}
return topMargin;
}
@Override
protected void onProgressUpdate(Integer ... topMargin) {
headerLayoutParams.topMargin = topMargin[0];
header.setLayoutParams(headerLayoutParams);
}
@Override
protected void onPostExecute(Integer topMargin) {
headerLayoutParams.topMargin = topMargin;
header.setLayoutParams(headerLayoutParams);
currentStatus = PULL_STATUS.STATUS_REFRESH_FINISHED;
}
}
/**
* 下拉刷新的監(jiān)聽器,使用下拉刷新的地方應(yīng)該注冊此監(jiān)聽器來獲取刷新回調(diào)
*/
public interface PullToRefreshListener {
// 刷新時(shí)會(huì)去回調(diào)此方法,在方法內(nèi)編寫具體的刷新邏輯。注意此方法是在子線程中調(diào)用的, 可以不必另開線程來進(jìn)行耗時(shí)操作
void onRefresh();
}
}

--> 第三步, 寫主布局:

<?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=".MainActivity" >
  <com.dragon.android.tofreshlayout.RefreshView
    android:id="@+id/refreshable_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <ListView
      android:id="@+id/list_view"
      android:layout_width="match_parent"
      android:layout_height="match_parent" >
    </ListView>
  </com.dragon.android.tofreshlayout.RefreshView>
</RelativeLayout>

--> 最后, Java 代碼添加 ListView 的數(shù)據(jù):

package com.dragon.android.tofreshlayout;
import android.os.Bundle;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.webkit.WebView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity {
  RefreshView refreshableView;
  ListView listView;
  ArrayAdapter<String> adapter;
  private WebView webView;
  private static int NUM = 30;
  String[] items = new String[NUM];
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    getSupportActionBar().hide();
    for (int i = 0; i < items.length; i++) {
      items[i] = "列表項(xiàng)" + i;
    }
    refreshableView = (RefreshView) findViewById(R.id.refreshable_view);
    listView = (ListView) findViewById(R.id.list_view);
    adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, items);
    listView.setAdapter(adapter);
    refreshableView.setOnRefreshListener(new RefreshView.PullToRefreshListener() {
      @Override
      public void onRefresh() {
        SystemClock.sleep(3000);
        refreshableView.finishRefreshing();
      }
    }, 0);
  }
}

程序 Demo: 鏈接:http://pan.baidu.com/s/1ge6Llw3 密碼:skna

***************其實(shí)還應(yīng)該再封裝的...*****************

以上所述是小編給大家介紹的Android自定義控件下拉刷新實(shí)例代碼,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對腳本之家網(wǎng)站的支持!

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