How to prevent double code running by clicking twice fast to a button in Android

问题

If i click fast to my button in my Android app, it seems that code behind it runs twice. If i click my menu button twice the activity that has to be launch onclick just starts twice and i have to quit from it twice.

This is really annoying because if i click too fast for menu buttons i can load up a whole bunch of activities in the background and i must quit them one by one, so this is clearly a buggy state of my app i want to fix this.

What can i do with this issue?

I use simple onClickListeners and Buttons

EDIT:

Regarding to answers and comments my menu buttons look like this:

top20Button.setOnClickListener(new OnClickListener()
{
    public void onClick(View v)
    {
        favButton.setClickable(false);
        nearButton.setClickable(false);
        highlightedButton.setClickable(false);
        top20Button.setClickable(false);

        Intent i = new Intent();
        i.putExtra("showDialog", false);
        i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        i.setClass(Search.this, Top20.class);
        startActivity(i);
        finish();

    }
});

After all this correction its still the same :S When i click like a mad person multiple activites are on the history stack and i must quit multiple times.

Any suggestions ? What m i doing wrong?

回答1:

You can use following code: btn.setEnabled(false);

btn.setOnclickListener(new View.onClickListener(){

      public void onClick(View v) {
            btn.setEnabled(false);

      }
});

回答2:

You can Disable the view temporarily like this

public static void disableTemporarly(final View view) {

        view.setEnabled(false);
        view.post(new Runnable() {
            @Override
            public void run() {

                view.setEnabled(true);
            }
        });
    }

Edit:

The above solution will work fine. But it will become even better when using the power of Kotlin

1) Create the SafeClikc Listener

class SafeClickListener(
        private var defaultInterval: Int = 1000,
        private val onSafeCLick: (View) -> Unit
) : View.OnClickListener {

    private var lastTimeClicked: Long = 0

    override fun onClick(v: View) {
        if (SystemClock.elapsedRealtime() - lastTimeClicked < defaultInterval) {
            return
        }
        lastTimeClicked = SystemClock.elapsedRealtime()
        onSafeCLick(v)
    }
}

2) Add extension function to make it works with any view, this will create a new SafeClickListener and delegate the work to it

fun View.setSafeOnClickListener(onSafeClick: (View) -> Unit) {

    val safeClickListener = SafeClickListener {
        onSafeClick(it)
    }
    setOnClickListener(safeClickListener)
}

3) Now it is very easy to use it

settingsButton.setSafeOnClickListener {
    showSettingsScreen()
}

Happy Kotlin ;)

回答3:

Well, that's the expected behaviour...

Launch your new acvitity with SINGLE_TOP flag

Or try setting android:launchMode="singleInstance" for Top20 activity in your AndroidManifest.xml

回答4:

This solves the issue of multiple Instances of activity, and still play the default animation

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

回答5:

 Button.setOnClickListener(new View.OnClickListener {  
   @Override
   public void onClick(final View v) {
        v.setEnabled(false);
        v.postDelayed(new Runnable() {
         @Override
         public void run() {
            v.setEnabled(true);
         }
        },150); //150 is in milliseconds
    }
 });

回答6:

This solution fits better to my requirements. Instead using enable/disable view feature. I use the time, first, create a variable to store the last time user pressed the view* then when the user presses the view, capture the time in a variable in order to compare the current moment and the last time user pressed the view, if the differential time between times is too small, which means fast,or extremely fast just ignore it and that's it. But if its a reasonable time to you, set the last time variable with the current time and do whatever else you want to do.

@Override
public void onListItemClick(ListView list, View item, int position, long id) {

    Long now = System.currentTimeMillis();
    if((now - lastTimeSelected) > 500){
        lastTimeSelected = now;
        // your code goes here
    } else {
        Log.i(TAG, "Too fast!");
    }

}

I saw a similar answer on other post, but nobody seems to like this approach.

回答7:

Add the following code snipet to your Activity definition in Androidmanifest.xml

android:launchMode = "singleTask"

回答8:

Use frozen variable inside Application class.

That is

public class App extends Application {
public static boolean frozen = false;
}

somewhere while click:

//...
onClick() {
if (frozen) {
return;
}
frozen = true
}
//...

Somewhere to release, for instance, when new Activity has been launched

onCreate (...) {
super.onCreate(...);
frozen = false;
}

in AndroidManifest.xml:

<application
        android:allowBackup="true"
        android:largeHeap="true"
        android:name="com.example.App"
        android:icon="@drawable/icon"
        android:label="@string/app_alias"
        android:theme="@style/AppTheme" >

来源：https://stackoverflow.com/questions/11290610/how-to-prevent-double-code-running-by-clicking-twice-fast-to-a-button-in-android

标签

android

android-button