上拉刷新

我不是女神ヾ 2022-07-15 02:52 171阅读 0赞

本文的上拉刷新需要用到 paginglistview 这个框架

public class MainActivity extends AppCompatActivity{
 
 private PagingListView listView;//listview private MyPagingAdaper adapter;//适配器 //设置的三个集合 private List<String> firstList;
 private List<String> secondList;
 private List<String> thirdList;
 
 private int pager = 0;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 listView = (PagingListView) findViewById(R.id.paging_list_view);
 adapter = new MyPagingAdaper();
 
 initData();
 
 listView.setAdapter(adapter);
 listView.setHasMoreItems(true);//用来判断是否还有更多的选项，确定footView的View是否显示还是progressBar显示出来 listView.setPagingableListener(new PagingListView.Pagingable() {
 @Override
 public void onLoadMoreItems() {
 if (pager < 3) {
 new CountryAsyncTask().execute();
 } else {
 listView.onFinishLoading(false, null);
 }
 }
 });
 }
 
 private void clearData() {
 pager = 0;
 adapter.removeAllItems();
 listView.setHasMoreItems(true);
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 getMenuInflater().inflate(R.menu.options_menu, menu);
 return true;
 }
 
 
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
 switch (item.getItemId()) {
 case R.id.refresh:
 clearData();
 return true;
 default:
 return super.onOptionsItemSelected(item);
 }
 }
 
 private void initData() {
 firstList = new ArrayList<String>();
 for (int i=0;i<12;i++){
 firstList.add("这是一组第"+i+"个item");
 }
 
 
 secondList = new ArrayList<String>();
 for (int i=0;i<5;i++){
 secondList.add("这是二组第"+i+"个item");
 }
 
 thirdList = new ArrayList<String>();
 for (int i=0;i<5;i++){
 thirdList.add("这是三组第"+i+"个item");
 }
 
 }
 
 private class CountryAsyncTask extends SafeAsyncTask<List<String>> {
 
 @Override
 public List<String> call() throws Exception {
 List<String> result = null;
 switch (pager) {
 case 0:
 result = firstList;
 break;
 case 1:
 result = secondList;
 break;
 case 2:
 result = thirdList;
 break;
 }
 Thread.sleep(3000);
 return result;
 }
 
 @Override
 protected void onSuccess(List<String> newItems) throws Exception {
 super.onSuccess(newItems);
 pager++;
 listView.onFinishLoading(true, newItems);
 }
 }
 
 }

==================================

package test.huawei.com.mypulltorefresh;
    
    import android.content.Context;
    import android.util.AttributeSet;
    import android.view.LayoutInflater;
    import android.widget.LinearLayout;
    
    /** * Created by Administrator on 2016/10/30. */ public class LoadMoreView extends LinearLayout {
        public LoadMoreView(Context context) {
            super(context,null);
        }
    
        public LoadMoreView(Context context, AttributeSet attrs) {
            super(context, attrs,0);
        }
    
        public LoadMoreView(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            init();
        }
    
        private void init() {
            LayoutInflater.from(getContext()).inflate(R.layout.lv_load_more,this);
        }
    }

===================================

package test.huawei.com.mypulltorefresh;
 
 import android.media.Image;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
 import com.paging.listview.PagingBaseAdapter;
 
 
 public class MyPagingAdaper extends PagingBaseAdapter<String> {
 
 @Override
 public int getCount() {
 return items.size();
 }
 
 @Override
 public String getItem(int position) {
 return items.get(position);
 }
 
 @Override
 public long getItemId(int position) {
 return position;
 }
 
 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
 ViewHolder viewHolder ;
 if (convertView==null){
 viewHolder = new ViewHolder();
 convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.listviewitem, null);
 viewHolder.textView = (TextView)convertView.findViewById(R.id.textview);
 viewHolder.image = (ImageView) convertView.findViewById(R.id.image);
 convertView.setTag(viewHolder);
 }else {
 viewHolder = (ViewHolder) convertView.getTag();
 }
 
 String text = getItem(position);
 viewHolder.image.setImageResource(R.drawable.ic_action_refresh);
 viewHolder.textView.setText(text);
 
 // // // if (convertView != null) { // textView = (TextView) convertView; // } else { // textView = (TextView) LayoutInflater.from(parent.getContext()).inflate(R.layout.simple_list_item_1, null); // } // textView.setText(text); return convertView;
 }
 
 public class ViewHolder{
 ImageView image ;
 TextView textView;
 }
 }

=============================

package test.huawei.com.mypulltorefresh;
 
 import android.os.Handler;
 import android.os.Looper;
 import android.util.Log;
 
 import java.io.InterruptedIOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.concurrent.Callable;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.concurrent.FutureTask;
 
 
 /** * A class similar but unrelated to android's { @link android.os.AsyncTask}. * * Unlike AsyncTask, this class properly propagates exceptions. * * If you're familiar with AsyncTask and are looking for { @link android.os.AsyncTask#doInBackground(Object[])}, * we've named it { @link #call()} here to conform with java 1.5's { @link Callable} interface. * * Current limitations: does not yet handle progress, although it shouldn't be * hard to add. * * If using your own executor, you must call future() to get a runnable you can execute. * * @param <ResultT> */ public abstract class SafeAsyncTask<ResultT> implements Callable<ResultT> {
 public static final int DEFAULT_POOL_SIZE = 25;
 protected static final Executor DEFAULT_EXECUTOR = Executors.newFixedThreadPool(DEFAULT_POOL_SIZE);
 
 protected Handler handler;
 protected Executor executor;
 protected StackTraceElement[] launchLocation;
 protected FutureTask<Void> future;
 
 
 /** * Sets executor to Executors.newFixedThreadPool(DEFAULT_POOL_SIZE) and * Handler to new Handler() */ public SafeAsyncTask() {
 this.executor = DEFAULT_EXECUTOR;
 }
 
 /** * Sets executor to Executors.newFixedThreadPool(DEFAULT_POOL_SIZE) */ public SafeAsyncTask(Handler handler) {
 this.handler = handler;
 this.executor = DEFAULT_EXECUTOR;
 }
 
 /** * Sets Handler to new Handler() */ public SafeAsyncTask(Executor executor) {
 this.executor = executor;
 }
 
 public SafeAsyncTask(Handler handler, Executor executor) {
 this.handler = handler;
 this.executor = executor;
 }
 
 
 public FutureTask<Void> future() {
 future = new FutureTask<Void>(newTask());
 return future;
 }
 
 public SafeAsyncTask<ResultT> executor(Executor executor) {
 this.executor = executor;
 return this;
 }
 
 public Executor executor() {
 return executor;
 }
 
 public SafeAsyncTask<ResultT> handler(Handler handler) {
 this.handler = handler;
 return this;
 }
 
 public Handler handler() {
 return handler;
 }
 
 public void execute() {
 execute(Thread.currentThread().getStackTrace());
 }
 
 protected void execute(StackTraceElement[] launchLocation) {
 this.launchLocation = launchLocation;
 executor.execute(future());
 }
 
 public boolean cancel(boolean mayInterruptIfRunning) {
 if (future == null) throw new UnsupportedOperationException("You cannot cancel this task before calling future()");
 
 return future.cancel(mayInterruptIfRunning);
 }
 
 
 /** * @throws Exception, captured on passed to onException() if present. */ protected void onPreExecute() throws Exception {
 }
 
 /** * @param t the result of { @link #call()} * @throws Exception, captured on passed to onException() if present. */ @SuppressWarnings({
 "UnusedDeclaration"})
 protected void onSuccess(ResultT t) throws Exception {
 }
 
 /** * Called when the thread has been interrupted, likely because * the task was canceled. * * By default, calls { @link #onException(Exception)}, but this method * may be overridden to handle interruptions differently than other * exceptions. * * @param e an InterruptedException or InterruptedIOException */ protected void onInterrupted(Exception e) {
 onException(e);
 }
 
 /** * Logs the exception as an Error by default, but this method may * be overridden by subclasses. * * @param e the exception thrown from { @link #onPreExecute()}, { @link #call()}, or { @link #onSuccess(Object)} * @throws RuntimeException, ignored */ protected void onException(Exception e) throws RuntimeException {
 onThrowable(e);
 }
 
 protected void onThrowable(Throwable t) throws RuntimeException {
 Log.e("roboguice", "Throwable caught during background processing", t);
 }
 
 /** * @throws RuntimeException, ignored */ protected void onFinally() throws RuntimeException {
 }
 
 
 protected Task<ResultT> newTask() {
 return new Task<ResultT>(this);
 }
 
 
 public static class Task<ResultT> implements Callable<Void> {
 protected SafeAsyncTask<ResultT> parent;
 protected Handler handler;
 
 public Task(SafeAsyncTask<ResultT> parent) {
 this.parent = parent;
 this.handler = parent.handler != null ? parent.handler : new Handler(Looper.getMainLooper());
 }
 
 public Void call() throws Exception {
 try {
 doPreExecute();
 doSuccess(doCall());
 
 } catch (final Exception e) {
 try {
 doException(e);
 } catch (Exception f) {
 // logged but ignored Log.e("BACKGROUND_TASK", "Exception in", f);
 }
 
 } catch (final Throwable t) {
 try {
 doThrowable(t);
 } catch (Exception f) {
 // logged but ignored Log.e("BACKGROUND_TASK", "Exception in", f);
 }
 } finally {
 doFinally();
 }
 
 return null;
 }
 
 protected void doPreExecute() throws Exception {
 postToUiThreadAndWait(new Callable<Object>() {
 public Object call() throws Exception {
 parent.onPreExecute();
 return null;
 }
 });
 }
 
 protected ResultT doCall() throws Exception {
 return parent.call();
 }
 
 protected void doSuccess(final ResultT r) throws Exception {
 postToUiThreadAndWait(new Callable<Object>() {
 public Object call() throws Exception {
 parent.onSuccess(r);
 return null;
 }
 });
 }
 
 protected void doException(final Exception e) throws Exception {
 if (parent.launchLocation != null) {
 final ArrayList<StackTraceElement> stack = new ArrayList<StackTraceElement>(Arrays.asList(e.getStackTrace()));
 stack.addAll(Arrays.asList(parent.launchLocation));
 e.setStackTrace(stack.toArray(new StackTraceElement[stack.size()]));
 }
 postToUiThreadAndWait(new Callable<Object>() {
 public Object call() throws Exception {
 if (e instanceof InterruptedException || e instanceof InterruptedIOException) parent.onInterrupted(e);
 else parent.onException(e);
 return null;
 }
 });
 }
 
 protected void doThrowable(final Throwable e) throws Exception {
 if (parent.launchLocation != null) {
 final ArrayList<StackTraceElement> stack = new ArrayList<StackTraceElement>(Arrays.asList(e.getStackTrace()));
 stack.addAll(Arrays.asList(parent.launchLocation));
 e.setStackTrace(stack.toArray(new StackTraceElement[stack.size()]));
 }
 postToUiThreadAndWait(new Callable<Object>() {
 public Object call() throws Exception {
 parent.onThrowable(e);
 return null;
 }
 });
 }
 
 protected void doFinally() throws Exception {
 postToUiThreadAndWait(new Callable<Object>() {
 public Object call() throws Exception {
 parent.onFinally();
 return null;
 }
 });
 }
 
 
 /** * Posts the specified runnable to the UI thread using a handler, * and waits for operation to finish. If there's an exception, * it captures it and rethrows it. * * @param c the callable to post * @throws Exception on error */ protected void postToUiThreadAndWait(final Callable c) throws Exception {
 final CountDownLatch latch = new CountDownLatch(1);
 final Exception[] exceptions = new Exception[1];
 
 // Execute onSuccess in the UI thread, but wait // for it to complete. // If it throws an exception, capture that exception // and rethrow it later. handler.post(new Runnable() {
 public void run() {
 try {
 c.call();
 } catch (Exception e) {
 exceptions[0] = e;
 } finally {
 latch.countDown();
 }
 }
 });
 
 // Wait for onSuccess to finish latch.await();
 
 if (exceptions[0] != null) throw exceptions[0];
 
 }
 
 }
 
 }