Android：如何检测双击？

我遇到了实现双击的问题。 那么我实现了onGestureListener ，我有gestureDetector ，但我不知道问题在哪里，这里是我的代码：

  public class home extends TabActivity implements OnGestureListener { /** Called when the activity is first created. */ private EditText queryText; private ResultsAdapter m_adapter; private ProgressDialog pd; final Handler h = new Handler(); private TabHost mTabHost; private ArrayList<SearchItem> sResultsArr = new ArrayList<SearchItem>(); private String queryStr; private JSONObject searchResponse; private GestureDetector gestureScanner; final Runnable mUpdateResults = new Runnable() { public void run() { updateListUi(); } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button search = (Button)findViewById(R.id.search); Button testButt = (Button)findViewById(R.id.testbutt); queryText = (EditText)findViewById(R.id.query); ListView lvr = (ListView)findViewById(R.id.search_results); //initialise the arrayAdapter this.m_adapter = new ResultsAdapter(home.this, R.layout.listrow, sResultsArr); lvr.setAdapter(this.m_adapter); lvr.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub pd = ProgressDialog.show(home.this, null,"Loading products from server", true, false); } }); gestureScanner = new GestureDetector(this,this); gestureScanner.setOnDoubleTapListener(new OnDoubleTapListener(){ public boolean onDoubleTap(MotionEvent e) { //viewA.setText("-" + "onDoubleTap" + "-"); pd = ProgressDialog.show(home.this, null,"Loading products from server", true, false); return false; } public boolean onDoubleTapEvent(MotionEvent e) { // viewA.setText("-" + "onDoubleTapEvent" + "-"); return false; } public boolean onSingleTapConfirmed(MotionEvent e) { //viewA.setText("-" + "onSingleTapConfirmed" + "-"); return false; } }); //initialise tab contents mTabHost = getTabHost(); mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Home").setContent(R.id.homepage)); mTabHost.addTab(mTabHost.newTabSpec("tab2").setIndicator("Search Results").setContent(R.id.tab2)); mTabHost.setCurrentTab(0); //sets the respective listeners testButt.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { if(mTabHost.getTabWidget().getVisibility()==View.GONE){ mTabHost.getTabWidget().setVisibility(View.VISIBLE); } else{ mTabHost.getTabWidget().setVisibility(View.GONE); } } }); search.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { sResultsArr.clear(); queryStr = "http://rose.mosuma.com/mobile?query=" + queryText.getText().toString(); pd = ProgressDialog.show(home.this, null,"Loading products from server", true, false); goSearch(); } }); } //updates the listUI whenever after receiving the response from the server public void updateListUi(){ if(sResultsArr.size() > 0){ } try{ String ptypename; int count; LinearLayout ptypebar = (LinearLayout)findViewById(R.id.productCat); ptypebar.removeAllViews(); JSONArray ptypes = searchResponse.getJSONArray("ptypes"); for(int index =0;index < ptypes.length();index++){ JSONObject ptype = ptypes.getJSONObject(index); count = ptype.getInt("count"); ptypename = ptype.getString("ptypename"); //add into tab 2's UI //ImageView icon = new ImageView(this); TextView t = new TextView(home.this); t.setText(ptypename + " (" + count + ")"); ptypebar.addView(t); } } catch(JSONException e){ } //if(m_adapter.getItems() != sResultsArr){ ArrayList<SearchItem> a = m_adapter.getItems(); a = sResultsArr; //} m_adapter.notifyDataSetChanged(); pd.dismiss(); } public void goSearch(){ mTabHost.setCurrentTab(1); //separate thread for making http request and updating the arraylist Thread t = new Thread() { public void run() { searchResponse = sendSearchQuery(queryStr); try{ JSONArray results = searchResponse.getJSONArray("results"); //this is stupid. i probably have to see how to make a json adapter for(int index =0;index < results.length();index++){ JSONObject product = results.getJSONObject(index); //gets the searched products from the json object URL imgUrl = new URL(product.getString("image")); String productname = product.getString("productname"); String ptypename = product.getString("ptypename"); int pid = product.getInt("pid"); int positive = product.getInt("pos"); int negative = product.getInt("neg"); int neutral = product.getInt("neu"); SearchItem item = new SearchItem(imgUrl,productname,ptypename,neutral,positive,negative,pid); sResultsArr.add(item); } } catch(JSONException e){ } catch(Exception e){ } //returns back to UI therad h.post(mUpdateResults); } }; t.start(); } //sends a request with qry as URL //and receives back a JSONobject as response public JSONObject sendSearchQuery(String qry){ HttpRequest r = new HttpRequest(); JSONObject response = r.sendHttpRequest(qry); return response; } @Override public boolean onDown(MotionEvent arg0) { return gestureScanner.onTouchEvent(arg0); } @Override public boolean onFling(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) { // TODO Auto-generated method stub return false; } @Override public void onLongPress(MotionEvent arg0) { // TODO Auto-generated method stub } @Override public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) { // TODO Auto-generated method stub return false; } @Override public void onShowPress(MotionEvent arg0) { // TODO Auto-generated method stub } @Override public boolean onSingleTapUp(MotionEvent arg0) { // TODO Auto-generated method stub return false; } 

哦，另一个问题，如果我的ListView有一个onItemClickListener ，可以android检测单击或双击它吗？

Answer 1

你为什么不使用长按？ 或者你是否已经使用了其他的东西？ 长按两次的优点：

• 长按是在UI准则推荐的互动，双触不是。
• 这是用户期望的; 用户可能无法find双触式操作，因为他们不会去查找它
• 它已经在API中处理了 。
• 实施“双触”会影响单触的处理，因为您必须等待每个单触成为双触，才能处理。

Answer 2

您可以使用手势检测器。 看下面的代码：

 public class MyView extends View { GestureDetector gestureDetector; public MyView(Context context, AttributeSet attrs) { super(context, attrs); // creating new gesture detector gestureDetector = new GestureDetector(context, new GestureListener()); } // skipping measure calculation and drawing // delegate the event to the gesture detector @Override public boolean onTouchEvent(MotionEvent e) { return gestureDetector.onTouchEvent(e); } private class GestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onDown(MotionEvent e) { return true; } // event when double tap occurs @Override public boolean onDoubleTap(MotionEvent e) { float x = e.getX(); float y = e.getY(); Log.d("Double Tap", "Tapped at: (" + x + "," + y + ")"); return true; } } } 

您可以重写侦听器的其他方法来获取单击，flinges等。

Answer 3

作为GestureDetector的一个轻量级替代品，您可以使用这个类

 public abstract class DoubleClickListener implements OnClickListener { private static final long DOUBLE_CLICK_TIME_DELTA = 300;//milliseconds long lastClickTime = 0; @Override public void onClick(View v) { long clickTime = System.currentTimeMillis(); if (clickTime - lastClickTime < DOUBLE_CLICK_TIME_DELTA){ onDoubleClick(v); } else { onSingleClick(v); } lastClickTime = clickTime; } public abstract void onSingleClick(View v); public abstract void onDoubleClick(View v); } 

例：

  view.setOnClickListener(new DoubleClickListener() { @Override public void onSingleClick(View v) { } @Override public void onDoubleClick(View v) { } }); 

Answer 4

结合“Bughi”“DoubleClickListner”和“Jayant Arora”计时器在一个包含类：

 public abstract class DoubleClickListener implements OnClickListener { private Timer timer = null; //at class level; private int DELAY = 400; private static final long DOUBLE_CLICK_TIME_DELTA = 300;//milliseconds long lastClickTime = 0; @Override public void onClick(View v) { long clickTime = System.currentTimeMillis(); if (clickTime - lastClickTime < DOUBLE_CLICK_TIME_DELTA){ processDoubleClickEvent(v); } else { processSingleClickEvent(v); } lastClickTime = clickTime; } public void processSingleClickEvent(final View v){ final Handler handler=new Handler(); final Runnable mRunnable=new Runnable(){ public void run(){ onSingleClick(v); //Do what ever u want on single click } }; TimerTask timertask=new TimerTask(){ @Override public void run(){ handler.post(mRunnable); } }; timer=new Timer(); timer.schedule(timertask,DELAY); } public void processDoubleClickEvent(View v){ if(timer!=null) { timer.cancel(); //Cancels Running Tasks or Waiting Tasks. timer.purge(); //Frees Memory by erasing cancelled Tasks. } onDoubleClick(v);//Do what ever u want on Double Click } public abstract void onSingleClick(View v); public abstract void onDoubleClick(View v); } 

并可以被称为：

 view.setOnClickListener(new DoubleClickListener() { @Override public void onSingleClick(View v) { } @Override public void onDoubleClick(View v) { } }); 

Answer 5

如果你不想去自定义视图，那么你可以使用下面的方法。 例如ImageView

 // class level GestureDetector gestureDetector; boolean tapped; ImageView imageView; // inside onCreate of Activity or Fragment gestureDetector = new GestureDetector(context,new GestureListener()); 

// ———————————————— ——————————–

 public class GestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onDown(MotionEvent e) { return true; } // event when double tap occurs @Override public boolean onDoubleTap(MotionEvent e) { tapped = !tapped; if (tapped) { } else { } return true; } } 

// ———————————————— ——————————–

为ImageView

 imageView.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub return gestureDetector.onTouchEvent(event); } }); 

Answer 6

这是我的解决scheme，它使用默认的setOnItemClickListener() 。 我有同样的任务来执行。 不久，我会发布我的github上的示例和自定义类。 给出简单的解释。 我不确定是否以毫秒为单位的时间是系统的正确差异（请参阅ViewConfiguration.getDoubleTapTimeout()源）来决定单击还是双击。

编辑：在这里看到： https ： //github.com/NikolaDespotoski/DoubleTapListView或https://github.com/NikolaDespotoski/DoubleTapListViewHandler

Answer 7

在大多数设备上，我想知道两个点击之间的时间可以定制双击事件，我无法做到这一点。 我通过“Bughi”“DoubleClickListner”更新了上面的代码，添加了一个使用处理程序的计时器，该计时器在一次单击之后执行特定延迟后执行代码，如果在该延迟之前执行双击，则取消计时器和单击任务，双击任务。 代码工作正常使用作为双击列表器是完美的：

  private Timer timer = null; //at class level; private int DELAY = 500; view.setOnClickListener(new DoubleClickListener() { @Override public void onSingleClick(View v) { final Handler handler = new Handler(); final Runnable mRunnable = new Runnable() { public void run() { processSingleClickEvent(v); //Do what ever u want on single click } }; TimerTask timertask = new TimerTask() { @Override public void run() { handler.post(mRunnable); } }; timer = new Timer(); timer.schedule(timertask, DELAY); } @Override public void onDoubleClick(View v) { if(timer!=null) { timer.cancel(); //Cancels Running Tasks or Waiting Tasks. timer.purge(); //Frees Memory by erasing cancelled Tasks. } processDoubleClickEvent(v);//Do what ever u want on Double Click } }); 

Answer 8

 boolean nonDoubleClick = true, singleClick = false; private long firstClickTime = 0L; private final int DOUBLE_CLICK_TIMEOUT = 200; listview.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View v, int pos, long id) { // TODO Auto-generated method stub Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { // TODO Auto-generated method stub if (singleClick) { Toast.makeText(getApplicationContext(), "Single Tap Detected", Toast.LENGTH_SHORT).show(); } firstClickTime = 0L; nonDoubleClick = true; singleClick = false; } }, 200); if (firstClickTime == 0) { firstClickTime = SystemClock.elapsedRealtime(); nonDoubleClick = true; singleClick = true; } else { long deltaTime = SystemClock.elapsedRealtime() - firstClickTime; firstClickTime = 0; if (deltaTime < DOUBLE_CLICK_TIMEOUT) { nonDoubleClick = false; singleClick = false; Toast.makeText(getApplicationContext(), "Double Tap Detected", Toast.LENGTH_SHORT).show(); } } } }); 

Answer 9

我的解决scheme，可能会有帮助。

 long lastTouchUpTime = 0; boolean isDoubleClick = false; private void performDoubleClick() { long currentTime = System.currentTimeMillis(); if(!isDoubleClick && currentTime - lastTouchUpTime < DOUBLE_CLICK_TIME_INTERVAL) { isDoubleClick = true; lastTouchUpTime = currentTime; Toast.makeText(context, "double click", Toast.LENGTH_SHORT).show(); } else { lastTouchUpTime = currentTime; isDoubleClick = false; } } 

Answer 10

实现单击和双击

 public abstract class DoubleClickListener implements View.OnClickListener { private static final long DOUBLE_CLICK_TIME_DELTA = 200; private long lastClickTime = 0; private View view; private Handler handler = new Handler(); private Runnable runnable = new Runnable() { @Override public void run() { onSingleClick(view); } }; private void runTimer(){ handler.removeCallbacks(runnable); handler.postDelayed(runnable,DOUBLE_CLICK_TIME_DELTA); } @Override public void onClick(View view) { this.view = view; long clickTime = System.currentTimeMillis(); if (clickTime - lastClickTime < DOUBLE_CLICK_TIME_DELTA){ handler.removeCallbacks(runnable); lastClickTime = 0; onDoubleClick(view); } else { runTimer(); lastClickTime = clickTime; } } public abstract void onSingleClick(View v); public abstract void onDoubleClick(View v); 

}

Answer 11

 public class MyView extends View { GestureDetector gestureDetector; public MyView(Context context, AttributeSet attrs) { super(context, attrs); // creating new gesture detector gestureDetector = new GestureDetector(context, new GestureListener()); } // skipping measure calculation and drawing // delegate the event to the gesture detector @Override public boolean onTouchEvent(MotionEvent e) { return gestureDetector.onTouchEvent(e); } private class GestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onDown(MotionEvent e) { return true; } // event when double tap occurs @Override public boolean onDoubleTap(MotionEvent e) { float x = e.getX(); float y = e.getY(); Log.d("Double Tap", "Tapped at: (" + x + "," + y + ")"); return true; } } } 

Answer 12

bughi＆Jayant Arora的副本解决scheme：

 public abstract class DoubleClickListener implements View.OnClickListener { private int position; private Timer timer; private static final long DOUBLE_CLICK_TIME_DELTA = 300;//milliseconds long lastClickTime = 0; public DoubleClickListener (int position) { this.position = position; } @Override public void onClick(View v) { long clickTime = System.currentTimeMillis(); if (clickTime - lastClickTime < DOUBLE_CLICK_TIME_DELTA){ if (timer != null) { timer.cancel(); //Cancels Running Tasks or Waiting Tasks. timer.purge(); //Frees Memory by erasing cancelled Tasks. } onDoubleClick(v, position); } else { final Handler handler = new Handler(); final Runnable mRunnable = () -> { onSingleClick(v, position); }; TimerTask timertask = new TimerTask() { @Override public void run() { handler.post(mRunnable); } }; timer = new Timer(); timer.schedule(timertask, DOUBLE_CLICK_TIME_DELTA); } lastClickTime = clickTime; } public abstract void onSingleClick(View v, int position); public abstract void onDoubleClick(View v, int position);}