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完成後果:
圖片素材:
--> 起首, 寫先下拉刷新時的刷新結構 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">釋放立刻刷新</string> <string name="refreshing">正在刷新...</string> <string name="not_updated_yet">暫未更新過</string> <string name="updated_at">前次更新於%1$s前</string> <string name="updated_just_now">方才更新</string> <string name="time_error">時光有成績</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 --> 然後, 也是重要的, 自界說下拉刷新的 View (包括下拉刷新一切操作) 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), // 下拉狀況 STATUS_RELEASE_TO_REFRESH(1), // 釋放立刻刷新狀況 STATUS_REFRESHING(2), // 正在刷新狀況 STATUS_REFRESH_FINISHED(3); // 刷新完成或未刷新狀況 private int status; // 狀況 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,用於斷定前次的更新時光 public static final long ONE_MINUTE = 60 * 1000; // 一小時的毫秒值,用於斷定前次的更新時光 public static final long ONE_HOUR = 60 * ONE_MINUTE; // 一天的毫秒值,用於斷定前次的更新時光 public static final long ONE_DAY = 24 * ONE_HOUR; // 一月的毫秒值,用於斷定前次的更新時光 public static final long ONE_MONTH = 30 * ONE_DAY; // 一年的毫秒值,用於斷定前次的更新時光 public static final long ONE_YEAR = 12 * ONE_MONTH; // 前次更新時光的字符串常量,用於作為 SharedPreferences 的鍵值 private static final String UPDATED_AT = "updated_at"; // 下拉刷新的回調接口 private PullToRefreshListener mListener; private SharedPreferences preferences; // 用於存儲前次更新時光 private View header; // 下拉頭的View private ListView listView; // 須要去下拉刷新的ListView private ProgressBar progressBar; // 刷新時顯示的進度條 private ImageView arrow; // 指導下拉和釋放的箭頭 private TextView description; // 指導下拉和釋放的文字描寫 private TextView updateAt; // 前次更新時光的文字描寫 private MarginLayoutParams headerLayoutParams; // 下拉頭的結構參數 private long lastUpdateTime; // 前次更新時光的毫秒值 // 為了避免分歧界面的下拉刷新在前次更新時光上相互有抵觸,應用id來做辨別 private int mId = -1; private int hideHeaderHeight; // 下拉頭的高度 /** * 以後處置甚麼狀況,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; // 記載上一次的狀況是甚麼,防止停止反復操作 private PULL_STATUS lastStatus = currentStatus; private float yDown; // 手指按下時的屏幕縱坐標 private int touchSlop; // 在被剖斷為轉動之前用戶手指可以挪動的最年夜值。 private boolean loadOnce; // 能否已加載過一次layout,這裡onLayout中的初始化只需加載一次 private boolean ableToPull; // 以後能否可以下拉,只要ListView轉動到頭的時刻才許可下拉 /** * 下拉刷新控件的結構函數,會在運轉時靜態添加一個下拉頭的結構 */ 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); } /** * 停止一些症結性的初始化操作,好比:將下拉頭向上偏移停止隱蔽,給 ListView 注冊 touch 事宜 */ @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 ListView 被觸摸時挪用,個中處置了各類下拉刷新的詳細邏輯 */ @Override public boolean onTouch(View v, MotionEvent event) { setCanAbleToPull(event); // 斷定能否可以下拉 if (ableToPull) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: yDown = event.getRawY(); break; case MotionEvent.ACTION_MOVE: // 獲得挪動中的 Y 軸的地位 float yMove = event.getRawY(); // 獲得從按下到挪動進程中挪動的間隔 int distance = (int) (yMove - yDown); // 假如手指是上滑狀況,而且下拉頭是完整隱蔽的,就屏障下拉事宜 if (distance <= 0 && headerLayoutParams.topMargin <= hideHeaderHeight) { return false; } if (distance < touchSlop) { return false; } // 斷定能否曾經在刷新狀況 if (currentStatus != PULL_STATUS.STATUS_REFRESHING) { // 斷定設置的 topMargin 能否 > 0, 默許初始設置為 -header.getHeight() if (headerLayoutParams.topMargin > 0) { currentStatus = PULL_STATUS.STATUS_RELEASE_TO_REFRESH; } else { // 不然狀況為下拉中的狀況 currentStatus = PULL_STATUS.STATUS_PULL_TO_REFRESH; } // 經由過程偏移下拉頭的 topMargin 值,來完成下拉後果 headerLayoutParams.topMargin = (distance / 2) + hideHeaderHeight; header.setLayoutParams(headerLayoutParams); } break; case MotionEvent.ACTION_UP: default: if (currentStatus == PULL_STATUS.STATUS_RELEASE_TO_REFRESH) { // 松手時假如是釋放立刻刷新狀況,就去挪用正在刷新的義務 new RefreshingTask().execute(); } else if (currentStatus == PULL_STATUS.STATUS_PULL_TO_REFRESH) { // 松手時假如是下拉狀況,就去挪用隱蔽下拉頭的義務 new HideHeaderTask().execute(); } break; } // 時辰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(); // 以後正處於下拉或釋放狀況,要讓 ListView 掉去核心,不然被點擊的那一項會一向處於選中狀況 listView.setPressed(false); listView.setFocusable(false); listView.setFocusableInTouchMode(false); lastStatus = currentStatus; // 以後正處於下拉或釋放狀況,經由過程前往 true 屏障失落 ListView 的轉動事宜 return true; } } return false; } /** * 給下拉刷新控件注冊一個監聽器 * * @param listener 監聽器的完成 * @param id 為了避免分歧界面的下拉刷新在前次更新時光上相互有抵觸,分歧界面在注冊下拉刷新監聽器時必定要傳入分歧的 id */ public void setOnRefreshListener(PullToRefreshListener listener, int id) { mListener = listener; mId = id; } /** * 當一切的刷新邏輯完成後,記載挪用一下,不然你的 ListView 將一向處於正在刷新狀況 */ public void finishRefreshing() { currentStatus = PULL_STATUS.STATUS_REFRESH_FINISHED; preferences.edit().putLong(UPDATED_AT + mId, System.currentTimeMillis()).commit(); new HideHeaderTask().execute(); } /** * 依據以後 ListView 的轉動狀況來設定 {@link #ableToPull} * 的值,每次都須要在 onTouch 中第一個履行,如許可以斷定出以後應當是轉動 ListView,照樣應當停止下拉 */ private void setCanAbleToPull(MotionEvent event) { View firstChild = listView.getChildAt(0); if (firstChild != null) { // 獲得 ListView 中第一個Item的地位 int firstVisiblePos = listView.getFirstVisiblePosition(); // 斷定第一個子控件的 Top 能否和第一個 Item 地位相等 if (firstVisiblePos == 0 && firstChild.getTop() == 0) { if (!ableToPull) { // getRawY() 取得的是絕對屏幕 Y 偏向的地位 yDown = event.getRawY(); } // 假如首個元素的上邊沿,間隔父結構值為 0,就解釋 ListView 轉動到了最頂部,此時應當許可下拉刷新 ableToPull = true; } else { if (headerLayoutParams.topMargin != hideHeaderHeight) { headerLayoutParams.topMargin = hideHeaderHeight; header.setLayoutParams(headerLayoutParams); } ableToPull = false; } } else { // 假如 ListView 中沒有元素,也應當許可下拉刷新 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(); } } /** * 依據以後的狀況來扭轉箭頭 */ 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); } /** * 刷新下拉頭中前次更新時光的文字描寫 */ 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"; 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); } /** * 正在刷新的義務,在此義務中會去回調注冊出去的下拉刷新監聽器 */ 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); } } /** * 隱蔽下拉頭的義務,當未停止下拉刷新或下拉刷新完成後,此義務將會使下拉頭從新隱蔽 */ 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; } } /** * 下拉刷新的監聽器,應用下拉刷新的處所應當注冊此監聽器來獲得刷新回調 */ public interface PullToRefreshListener { // 刷新時會去回調此辦法,在辦法內編寫詳細的刷新邏輯。留意此辦法是在子線程中挪用的, 可以不用另開線程來停止耗時操作 void onRefresh(); } }
--> 第三步, 寫主結構:
<?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>
--> 最初, Java 代碼添加 ListView 的數據:
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" + 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); } }
法式 Demo: 鏈接:http://pan.百度.com/s/1ge6Llw3 暗碼:skna
***************其實還應當再封裝的...*****************
以上所述是小編給年夜家引見的Android自界說控件下拉刷新實例代碼,願望對年夜家有所贊助,假如年夜家有任何疑問請給我留言,小編會實時答復年夜家的。在此也異常感激年夜家對網站的支撐!