在我的应用程序中,我有一个按钮。单击按钮和双击按钮后将执行单独的操作。我怎样才能做到这一点?谢谢
10 回答
您可能需要创建一个延迟变量,以区分单击和双击。
看到这段代码,
private static final long DOUBLE_PRESS_INTERVAL = 250; // in millis
private long lastPressTime;
private boolean mHasDoubleClicked = false;
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// Get current time in nano seconds.
long pressTime = System.currentTimeMillis();
// If double click...
if (pressTime - lastPressTime <= DOUBLE_PRESS_INTERVAL) {
Toast.makeText(getApplicationContext(), "Double Click Event", Toast.LENGTH_SHORT).show();
mHasDoubleClicked = true;
}
else { // If not double click....
mHasDoubleClicked = false;
Handler myHandler = new Handler() {
public void handleMessage(Message m) {
if (!mHasDoubleClicked) {
Toast.makeText(getApplicationContext(), "Single Click Event", Toast.LENGTH_SHORT).show();
}
}
};
Message m = new Message();
myHandler.sendMessageDelayed(m,DOUBLE_PRESS_INTERVAL);
}
// record the last time the menu button was pressed.
lastPressTime = pressTime;
return true;
}
那么它很简单只是覆盖。
OnClickListener 的 onClick 方法
public abstract class DoubleClickListener implements View.OnClickListener {
private static final long DEFAULT_QUALIFICATION_SPAN = 200;
private boolean isSingleEvent;
private long doubleClickQualificationSpanInMillis;
private long timestampLastClick;
private Handler handler;
private Runnable runnable;
public DoubleClickListener() {
doubleClickQualificationSpanInMillis = DEFAULT_QUALIFICATION_SPAN;
timestampLastClick = 0;
handler = new Handler();
runnable = new Runnable() {
@Override
public void run() {
if (isSingleEvent) {
onSingleClick();
}
}
};
}
@Override
public void onClick(View v) {
if((SystemClock.elapsedRealtime() - timestampLastClick) < doubleClickQualificationSpanInMillis) {
isSingleEvent = false;
handler.removeCallbacks(runnable);
onDoubleClick();
return;
}
isSingleEvent = true;
handler.postDelayed(runnable, DEFAULT_QUALIFICATION_SPAN);
timestampLastClick = SystemClock.elapsedRealtime();
}
public abstract void onDoubleClick();
public abstract void onSingleClick();
}
用法
button.setOnClickListener(new DoubleClickListener() {
@Override
public void onDoubleClick() {
Log.i("onClick", "double");
}
@Override
public void onSingleClick() {
Log.i("onClick", "single");
}
});
您可能要考虑不使用 DoubleTap。这不是正常的 Android 行为。
当我第一次开始在 Android 上编程时,我不断遇到在 android 上真正“难以”做的事情。随着时间的流逝,我发现其中许多都很难,因为它们是一个非常糟糕的主意。
如果您要移植 iOS 应用程序或模拟 iOS 应用程序的行为,您可能需要考虑将 UI 转换为 Android 样式的行为并使用 longPress 或其他“androidy”手势。
这是一个类似的问题和答案:
您必须实现GestureDetector并将您的代码放入single/double click
.
测试活动.java
iv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//putyour first activity call.
}
}
iv.setOnTouchListener(new OnTouchListener() {
GestureDetector gestureDetector = new GestureDetector(context, new MyGestureDetector(context));
@Override
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
});
现在你必须创建GestureDetector.java
类。
public class MyGestureDetector extends SimpleOnGestureListener {
public Context context;
public String phno;
public MyGestureDetector(Context con) {
this.context=con;
}
@Override
public boolean onDown(MotionEvent e) {
return super.onDown(e);
}
@Override
public boolean onDoubleTap(MotionEvent e) {
System.out.println("in Double tap");
return true;
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
System.out.println("in single tap up");
//put your second activity.
return super.onSingleTapUp(e);
}
}
感谢@NikolaDespotoski。_
您可以从以下URL检查DOUBLE-TAP 示例。在 listView 中使用。我希望它对你有用。
https://nodeload.github.com/NikolaDespotoski/DoubleTapListView/zip/master
虽然为时已晚,但任何人都可以弄清楚他们是否看到了这一点。
int number_of_clicks = 0;
boolean thread_started = false;
final int DELAY_BETWEEN_CLICKS_IN_MILLISECONDS = 250;
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
++number_of_clicks;
if(!thread_started){
new Thread(new Runnable() {
@Override
public void run() {
thread_started = true;
try {
Thread.sleep(DELAY_BETWEEN_CLICKS_IN_MILLISECONDS);
if(number_of_clicks == 1){
client.send(AppHelper.FORMAT_LEFT_CLICK);
} else if(number_of_clicks == 2){
client.send(AppHelper.FORMAT_DOUBLE_CLICK);
}
number_of_clicks = 0;
thread_started = false;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
}
});
解释:
在单击按钮之前,number_of_click 被初始化为 0。thread_started 是一个标志,用于检测线程之前是否启动过。现在,在单击按钮时,通过增量运算符增加按钮单击的次数。检查线程之前是否启动过,如果没有,则启动线程。在线程上,使用 number_of_clicks 应用您的逻辑。并且线程将等待下一毫秒,然后将通过您的逻辑。因此,现在您可以根据需要应用任意数量的点击。
通过继承View.OnClickListener并检查点击时间来区分单击或双击来解决这个问题,这也解决了快速点击的问题。此解决方案将带来较小的代码更改,只需替换 View.OnClickLister。您还可以覆盖 getGap() 以重新定义两次单击之间的时间。
import android.os.SystemClock;
import android.view.View;
/*****
* Implement to fix the double click problem.
* Avoid the fast double click for button and images.
*/
public abstract class OnSingleClickListener implements View.OnClickListener {
private long prevClickTime =0;
@Override
public void onClick(View v) {
_onClick(v);
}
private synchronized void _onClick(View v){
long current = SystemClock.elapsedRealtime();
if(current-prevClickTime> getGap()){
onSingleClick(v);
prevClickTime = SystemClock.elapsedRealtime();
}else {
onDoubleClick(v);
prevClickTime = 0;
}
}
public abstract void onSingleClick(View v);
public abstract void onDoubleClick(View v);
/********
*
* @return The time in ms between two clicks.
*/
public long getGap(){
return 500L; //500ms
}
}
这是@saksham 在 Kotlin 中的回答。
abstract class DoubleClickListener : View.OnClickListener {
private val DEFAULT_QUALIFICATION_SPAN = 200L
private var isSingleEvent = false
private val doubleClickQualificationSpanInMillis =
DEFAULT_QUALIFICATION_SPAN
private var timestampLastClick = 0L
private val handler = Handler(Looper.getMainLooper())
private val runnable: () -> Unit = {
if (isSingleEvent) {
onSingleClick()
}
}
override fun onClick(v: View) {
if (SystemClock.elapsedRealtime() - timestampLastClick < doubleClickQualificationSpanInMillis) {
isSingleEvent = false
handler.removeCallbacks(runnable)
onDoubleClick()
return
}
isSingleEvent = true
handler.postDelayed(runnable, DEFAULT_QUALIFICATION_SPAN)
timestampLastClick = SystemClock.elapsedRealtime()
}
abstract fun onDoubleClick()
abstract fun onSingleClick()
}
up 解决方案不能用于多次单击,我对其进行了测试但失败了。
所以我建议将 RxBinding 与 ProgressDialog 一起使用。
单击按钮时,progressDialog显示设置无法取消,修复它。
我也遇到过同样的问题
setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(isFmOn()){
//stopFM
}else{
//do other things
}
}
}
当我单击按钮时,FM 停止;但是当我双击时,FM 并没有停止。问题是单击按钮和双击按钮时,isFmOn() 的值不同。我用这个解决了这个问题:
setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Thread.sleep(500);//500ms was enough to finish stopFM before the second click
if(isFmOn()){
//stopFM
}else{
//do other things
}
}
}