Android-ListView 下拉重新整理

Android-ListView 下拉重新整理

 

分享一個下拉重新整理的解決辦法，：

 

Main.java：

 

package example.com.list;import java.util.LinkedList;import example.com.list.R;import example.com.list.R.id;import example.com.list.R.layout;import example.com.list.MyListView.OnRefreshListener;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;public class MainActivity extends Activity {private LinkedList data;private BaseAdapter adapter;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);data = new LinkedList();    for(int i=0;i<6;i++){    data.add(String.valueOf(i));    }final MyListView listView = (MyListView) findViewById(R.id.listView);adapter = new BaseAdapter() {public View getView(int position, View convertView, ViewGroup parent) { convertView=LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, null);TextView textView = (TextView) convertView.findViewById(R.id.textView_item);textView.setText(data.get(position));return convertView;}public long getItemId(int position) {return position;}public Object getItem(int position) {return data.get(position);}public int getCount() {return data.size();}};listView.setAdapter(adapter);listView.setonRefreshListener(new OnRefreshListener() {public void onRefresh() {new AsyncTask() {protected Void doInBackground(Void... params) {try {Thread.sleep(1000);} catch (Exception e) {e.printStackTrace();}return null;}@Overrideprotected void onPostExecute(Void result) {adapter.notifyDataSetChanged();listView.onRefreshComplete();}};}});}}

ListView.java：

 

 

package example.com.list;import java.text.SimpleDateFormat;import java.util.Date;import example.com.list.R;import example.com.list.R.drawable;import example.com.list.R.id;import example.com.list.R.layout;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.animation.LinearInterpolator;import android.view.animation.RotateAnimation;import android.widget.AbsListView;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.AbsListView.OnScrollListener;import android.widget.ProgressBar;import android.widget.TextView;public class MyListView extends ListView implements OnScrollListener {private static final String TAG = listview;private final static int RELEASE_To_REFRESH = 0; //釋放重新整理 private final static int PULL_To_REFRESH = 1;//拉動重新整理 private final static int REFRESHING = 2;//正在重新整理 private final static int DONE = 3;private final static int LOADING = 4;// 實際的padding的距離與介面上位移距離的比例 private final static int RATIO = 3;private LayoutInflater inflater;private LinearLayout headView;private TextView tipsTextview;private TextView lastUpdatedTextView;private ImageView arrowImageView;private ProgressBar progressBar;private RotateAnimation animation;private RotateAnimation reverseAnimation; // 用於保證startY的值在一個完整的touch事件中只被記錄一次 private boolean isRecored;private int headContentWidth;private int headContentHeight;private int startY;private int firstItemIndex;private int state;private boolean isBack;private OnRefreshListener refreshListener;private boolean isRefreshable;public MyListView(Context context) {super(context);init(context);}public MyListView(Context context, AttributeSet attrs) {super(context, attrs);init(context);}private void init(Context context) {//setCacheColorHint(context.getResources().getColor(R.color.transparent));inflater = LayoutInflater.from(context);headView = (LinearLayout) inflater.inflate(R.layout.head, null);arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView);arrowImageView.setMinimumWidth(70);arrowImageView.setMinimumHeight(50);progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar);tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView);measureView(headView);headContentHeight = headView.getMeasuredHeight();headContentWidth = headView.getMeasuredWidth();headView.setPadding(0, -1 * headContentHeight, 0, 0);headView.invalidate();addHeaderView(headView, null, false);setOnScrollListener(this);animation = new RotateAnimation(0, -180,RotateAnimation.RELATIVE_TO_SELF, 0.5f,RotateAnimation.RELATIVE_TO_SELF, 0.5f);animation.setInterpolator(new LinearInterpolator());animation.setDuration(250);animation.setFillAfter(true);reverseAnimation = new RotateAnimation(-180, 0,RotateAnimation.RELATIVE_TO_SELF, 0.5f,RotateAnimation.RELATIVE_TO_SELF, 0.5f);reverseAnimation.setInterpolator(new LinearInterpolator());reverseAnimation.setDuration(200);reverseAnimation.setFillAfter(true);state = DONE;isRefreshable = false;}public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2,int arg3) {firstItemIndex = firstVisiableItem;}public void onScrollStateChanged(AbsListView arg0, int arg1) {}public boolean onTouchEvent(MotionEvent event) {if (isRefreshable) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:if (firstItemIndex == 0 && !isRecored) {isRecored = true;startY = (int) event.getY();}break;case MotionEvent.ACTION_UP:if (state != REFRESHING && state != LOADING) {if (state == DONE) {}if (state == PULL_To_REFRESH) {state = DONE;changeHeaderViewByState();}if (state == RELEASE_To_REFRESH) {state = REFRESHING;changeHeaderViewByState();onRefresh();}}isRecored = false;isBack = false;break;case MotionEvent.ACTION_MOVE:int tempY = (int) event.getY();if (!isRecored && firstItemIndex == 0) {isRecored = true;startY = tempY;}if (state != REFRESHING && isRecored && state != LOADING) { // 保證在設定padding的過程中，當前的位置一直是在head，否則如果當列表超出螢幕的話，當在上推的時候，列表會同時進行滾動// 可以鬆手去重新整理了if (state == RELEASE_To_REFRESH) {setSelection(0); // 往上推了，推到了螢幕足夠掩蓋head的程度，但是還沒有推到全部掩蓋的地步if (((tempY - startY) / RATIO < headContentHeight)&& (tempY - startY) > 0) {state = PULL_To_REFRESH;changeHeaderViewByState();}// 一下子推到頂了 else if (tempY - startY <= 0) {state = DONE;changeHeaderViewByState();}// 往下拉了，或者還沒有上推到螢幕頂部掩蓋head的地步else {// 不用進行特別的操作，只用更新paddingTop的值就行了}}// 還沒有到達顯示鬆開重新整理的時候,DONE或者是PULL_To_REFRESH狀態 if (state == PULL_To_REFRESH) {setSelection(0);// 下拉到可以進入RELEASE_TO_REFRESH的狀態if ((tempY - startY) / RATIO >= headContentHeight) {state = RELEASE_To_REFRESH;isBack = true;changeHeaderViewByState();}// 上推到頂了else if (tempY - startY <= 0) {state = DONE;changeHeaderViewByState();}}// done狀態下 if (state == DONE) {if (tempY - startY > 0) {state = PULL_To_REFRESH;changeHeaderViewByState();}}// 更新headView的sizeif (state == PULL_To_REFRESH) {headView.setPadding(0, -1 * headContentHeight+ (tempY - startY) / RATIO, 0, 0);}// 更新headView的paddingTop if (state == RELEASE_To_REFRESH) {headView.setPadding(0, (tempY - startY) / RATIO- headContentHeight, 0, 0);}}break;}}return super.onTouchEvent(event);}// 當狀態改變時候，調用該方法，以更新介面 private void changeHeaderViewByState() {switch (state) {case RELEASE_To_REFRESH:arrowImageView.setVisibility(View.VISIBLE);progressBar.setVisibility(View.GONE);tipsTextview.setVisibility(View.VISIBLE);lastUpdatedTextView.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.startAnimation(animation);tipsTextview.setText(Release);break;case PULL_To_REFRESH:progressBar.setVisibility(View.GONE);tipsTextview.setVisibility(View.VISIBLE);lastUpdatedTextView.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.setVisibility(View.VISIBLE);// 是由RELEASE_To_REFRESH狀態轉變來的if (isBack) {isBack = false;arrowImageView.clearAnimation();arrowImageView.startAnimation(reverseAnimation);tipsTextview.setText(Pull down);} else {tipsTextview.setText(Pull down);}break;case REFRESHING:headView.setPadding(0, 0, 0, 0);progressBar.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.setVisibility(View.GONE);tipsTextview.setText(Refreshing...);lastUpdatedTextView.setVisibility(View.VISIBLE);break;case DONE:headView.setPadding(0, -1 * headContentHeight, 0, 0);progressBar.setVisibility(View.GONE);arrowImageView.clearAnimation();arrowImageView.setImageResource(R.drawable.arrow_down);tipsTextview.setText(Pull down);lastUpdatedTextView.setVisibility(View.VISIBLE);break;}}public void setonRefreshListener(OnRefreshListener refreshListener) {this.refreshListener = refreshListener;isRefreshable = true;}public interface OnRefreshListener {public void onRefresh();}public void onRefreshComplete() {state = DONE;SimpleDateFormat format=new SimpleDateFormat(yyyy.MM.dd. HH:mm);String date=format.format(new Date());lastUpdatedTextView.setText(recently: + date);changeHeaderViewByState();}private void onRefresh() {if (refreshListener != null) {refreshListener.onRefresh();}}private void measureView(View child) { ViewGroup.LayoutParams p = child.getLayoutParams();        if (p == null) {            p = new ViewGroup.LayoutParams(                    ViewGroup.LayoutParams.FILL_PARENT,                    ViewGroup.LayoutParams.WRAP_CONTENT);        }        int childWidthSpec = ViewGroup.getChildMeasureSpec(0,                0 + 0, p.width);        int lpHeight = p.height;        int childHeightSpec;        if (lpHeight > 0) {            childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY);        } else {            childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);        }        child.measure(childWidthSpec, childHeightSpec);}public void setAdapter(BaseAdapter adapter) {SimpleDateFormat format=new SimpleDateFormat(yyyy.MM.dd. HH:mm);String date=format.format(new Date());lastUpdatedTextView.setText(recently: + date);super.setAdapter(adapter);}}