Android - Handle “Enter” in an EditText

问题:

I am wondering if there is a way to handle the user pressing Enter while typing in an EditText, something like the onSubmit HTML event.

Also wondering if there is a way to manipulate the virtual keyboard in such a way that the \"Done\" button is labeled something else (for example \"Go\") and performs a certain action when clicked (again, like onSubmit).

回答1:

I am wondering if there is a way to handle the user pressing Enter while typing in an EditText, something like the onSubmit HTML event.

Yes.

Also wondering if there is a way to manipulate the virtual keyboard in such a way that the \"Done\" button is labeled something else (for example \"Go\") and performs a certain action when clicked (again, like onSubmit).

Also yes.

You will want to look at the android:imeActionId and android:imeOptions attributes, plus the setOnEditorActionListener() method, all on TextView.

For changing the text of the \"Done\" button to a custom string, use:

mEditText.setImeActionLabel(\"Custom text\", KeyEvent.KEYCODE_ENTER);

回答2:

final EditText edittext = (EditText) findViewById(R.id.edittext);
edittext.setOnKeyListener(new OnKeyListener() {
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        // If the event is a key-down event on the \"enter\" button
        if ((event.getAction() == KeyEvent.ACTION_DOWN) &&
            (keyCode == KeyEvent.KEYCODE_ENTER)) {
          // Perform action on key press
          Toast.makeText(HelloFormStuff.this, edittext.getText(), Toast.LENGTH_SHORT).show();
          return true;
        }
        return false;
    }
});

回答3:

Here\'s what you do. It\'s also hidden in the Android Developer\'s sample code \'Bluetooth Chat\'. Replace the bold parts that say \"example\" with your own variables and methods.

First, import what you need into the main Activity where you want the return button to do something special:

import android.view.inputmethod.EditorInfo;
import android.widget.TextView;
import android.view.KeyEvent;

Now, make a variable of type TextView.OnEditorActionListener for your return key (here I use exampleListener);

TextView.OnEditorActionListener exampleListener = new TextView.OnEditorActionListener(){

Then you need to tell the listener two things about what to do when the return button is pressed. It needs to know what EditText we\'re talking about (here I use exampleView), and then it needs to know what to do when the Enter key is pressed (here, example_confirm()). If this is the last or only EditText in your Activity, it should do the same thing as the onClick method for your Submit (or OK, Confirm, Send, Save, etc) button.

public boolean onEditorAction(TextView exampleView, int actionId, KeyEvent event) {
   if (actionId == EditorInfo.IME_NULL  
      && event.getAction() == KeyEvent.ACTION_DOWN) { 
      example_confirm();//match this behavior to your \'Send\' (or Confirm) button
   }
   return true;
}

Finally, set the listener (most likely in your onCreate method);

exampleView.setOnEditorActionListener(exampleListener);

回答4:

Hardware keyboards always yield enter events, but software keyboards return different actionIDs and nulls in singleLine EditTexts. This code responds every time the user presses enter in an EditText that this listener has been set to, regardless of EditText or keyboard type.

import android.view.inputmethod.EditorInfo;
import android.view.KeyEvent;
import android.widget.TextView.OnEditorActionListener;

listener=new TextView.OnEditorActionListener() {
  @Override
  public boolean onEditorAction(TextView view, int actionId, KeyEvent event) {
    if (event==null) {
      if (actionId==EditorInfo.IME_ACTION_DONE);
      // Capture soft enters in a singleLine EditText that is the last EditText.
      else if (actionId==EditorInfo.IME_ACTION_NEXT);
      // Capture soft enters in other singleLine EditTexts
      else return false;  // Let system handle all other null KeyEvents
    }
    else if (actionId==EditorInfo.IME_NULL) { 
    // Capture most soft enters in multi-line EditTexts and all hard enters.
    // They supply a zero actionId and a valid KeyEvent rather than
    // a non-zero actionId and a null event like the previous cases.
      if (event.getAction()==KeyEvent.ACTION_DOWN); 
      // We capture the event when key is first pressed.
      else  return true;   // We consume the event when the key is released.  
    }
    else  return false; 
    // We let the system handle it when the listener
    // is triggered by something that wasn\'t an enter.


    // Code from this point on will execute whenever the user
    // presses enter in an attached view, regardless of position, 
    // keyboard, or singleLine status.

    if (view==multiLineEditText)  multiLineEditText.setText(\"You pressed enter\");
    if (view==singleLineEditText)  singleLineEditText.setText(\"You pressed next\");
    if (view==lastSingleLineEditText)  lastSingleLineEditText.setText(\"You pressed done\");
    return true;   // Consume the event
  }
};

The default appearance of the enter key in singleLine=false gives a bent arrow enter keypad. When singleLine=true in the last EditText the key says DONE, and on the EditTexts before it it says NEXT. By default, this behavior is consistent across all vanilla, android, and google emulators. The scrollHorizontal attribute doesn\'t make any difference. The null test is important because the response of phones to soft enters is left to the manufacturer and even in the emulators, the vanilla Level 16 emulators respond to long soft enters in multi-line and scrollHorizontal EditTexts with an actionId of NEXT and a null for the event.

回答5:

I know this is a year old, but I just discovered this works perfectly for an EditText.

EditText textin = (EditText) findViewById(R.id.editText1);
textin.setInputType(InputType.TYPE_CLASS_TEXT);

It prevents anything but text and space. I could not tab, \"return\" (\"\\n\"), or anything.

回答6:

Just as an addendum to Chad\'s response (which worked almost perfectly for me), I found that I needed to add a check on the KeyEvent action type to prevent my code executing twice (once on the key-up and once on the key-down event).

if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_DOWN)
{
    // your code here
}

See http://developer.android.com/reference/android/view/KeyEvent.html for info about repeating action events (holding the enter key) etc.

回答7:

I had a similar purpose. I wanted to resolve pressing the \"Enter\" key on the keyboard (which I wanted to customize) in an AutoCompleteTextView which extends TextView. I tried different solutions from above and they seemed to work. BUT I experienced some problems when I switched the input type on my device (Nexus 4 with AOKP ROM) from SwiftKey 3 (where it worked perfectly) to the standard Android keyboard (where instead of handling my code from the listener, a new line was entered after pressing the \"Enter\" key. It took me a while to handle this problem, but I don\'t know if it will work under all circumstances no matter which input type you use.

So here\'s my solution:

Set the input type attribute of the TextView in the xml to \"text\":

android:inputType=\"text\"

Customize the label of the \"Enter\" key on the keyboard:

myTextView.setImeActionLabel(\"Custom text\", KeyEvent.KEYCODE_ENTER);

Set an OnEditorActionListener to the TextView:

myTextView.setOnEditorActionListener(new OnEditorActionListener()
{
    @Override
    public boolean onEditorAction(TextView v, int actionId,
        KeyEvent event)
    {
    boolean handled = false;
    if (actionId == KeyEvent.KEYCODE_ENTER)
    {
        // Handle pressing \"Enter\" key here

        handled = true;
    }
    return handled;
    }
});

I hope this can help others to avoid the problems I had, because they almost drove me nuts.

回答8:

This page describes exactly how to do this.

https://developer.android.com/training/keyboard-input/style.html

Set the android:imeOptions then you just check the actionId in onEditorAction. So if you set imeOptions to \'actionDone\' then you would check for \'actionId == EditorInfo.IME_ACTION_DONE\' in onEditorAction. Also, make sure to set the android:inputType.

Here\'s the EditText from the example linked above:

<EditText
    android:id=\"@+id/search\"
    android:layout_width=\"fill_parent\"
    android:layout_height=\"wrap_content\"
    android:hint=\"@string/search_hint\"
    android:inputType=\"text\"
    android:imeOptions=\"actionSend\" />

You can also set this programmatically using the setImeOptions(int) function. Here\'s the OnEditorActionListener from the example linked above:

EditText editText = (EditText) findViewById(R.id.search);
editText.setOnEditorActionListener(new OnEditorActionListener() {
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        boolean handled = false;
        if (actionId == EditorInfo.IME_ACTION_SEND) {
            sendMessage();
            handled = true;
        }
        return handled;
    }
});

回答9:

In your xml, add the imeOptions attribute to the editText

<EditText
    android:id=\"@+id/edittext_additem\"
    ...
    android:imeOptions=\"actionDone\"
    />

Then, in your Java code, add the OnEditorActionListener to the same EditText

mAddItemEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            if(actionId == EditorInfo.IME_ACTION_DONE){
                //do stuff
                return true;
            }
            return false;
        }
    });

Here is the explanation- The imeOptions=actionDone will assign \"actionDone\" to the EnterKey. The EnterKey in the keyboard will change from \"Enter\" to \"Done\". So when Enter Key is pressed, it will trigger this action and thus you will handle it.

回答10:

You can also do it..

editText.setOnKeyListener(new OnKeyListener() {

            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event)
            {
                if (event.getAction() == KeyEvent.ACTION_DOWN
                        && event.getKeyCode() ==       KeyEvent.KEYCODE_ENTER) 
                {
                    Log.i(\"event\", \"captured\");

                    return false;
                } 

            return false;
        }
    });

回答11:

     password.setOnEditorActionListener(new TextView.OnEditorActionListener() {
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            if(event != null && event.getKeyCode() == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN) {
                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.toggleSoftInput(InputMethodManager.SHOW_IMPLICIT, 0);
                submit.performClick();
                return true;
            }
            return false;
        }
    });

Works very fine for me
In addition hide keyboard

回答12:

First, you have to set EditText listen to key press

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main); 

    // Set the EditText listens to key press
    EditText edittextproductnumber = (EditText) findViewById(R.id.editTextproductnumber);
    edittextproductnumber.setOnKeyListener(this);

}

Second, define the event upon the key press, for example, event to set TextView\'s text:

@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub

 // Listen to \"Enter\" key press
 if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER))
 {
     TextView textviewmessage = (TextView) findViewById(R.id.textViewmessage);
     textviewmessage.setText(\"You hit \'Enter\' key\");
     return true;
 }

return false;   

}

And finally, do not forget to import EditText,TextView,OnKeyListener,KeyEvent at top:

import android.view.KeyEvent;
import android.view.View.OnKeyListener;
import android.widget.EditText;
import android.widget.TextView;

回答13:

working perfectly

public class MainActivity extends AppCompatActivity {  
TextView t;
Button b;
EditText e;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    b = (Button) findViewById(R.id.b);
    e = (EditText) findViewById(R.id.e);

    e.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

            if (before == 0 && count == 1 && s.charAt(start) == \'\\n\') {

                b.performClick();
                e.getText().replace(start, start + 1, \"\"); //remove the <enter>
            }

        }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
        @Override
        public void afterTextChanged(Editable s) {}
    });

    b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            b.setText(\"ok\");

        }
    });
}

}

working perfectly

回答14:

This works fine on LG Android phones. It prevents ENTER and other special characters to be interpreted as normal character. Next or Done button appears automatically and ENTER works as expected.

edit.setInputType(InputType.TYPE_CLASS_TEXT);

回答15:

editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            if (actionId != 0 || event.getAction() == KeyEvent.ACTION_DOWN) {
                // Action
                return true;
            } else {
                return false;
            }
        }
    });

Xml

<EditText
        android:id=\"@+id/editText2\"
        android:layout_width=\"fill_parent\"
        android:layout_height=\"wrap_content\"
        android:hint=\"@string/password\"
        android:imeOptions=\"actionGo|flagNoFullscreen\"
        android:inputType=\"textPassword\"
        android:maxLines=\"1\" />

回答16:

This should work

input.addTextChangedListener(new TextWatcher() {

           @Override
           public void afterTextChanged(Editable s) {}

           @Override    
           public void beforeTextChanged(CharSequence s, int start,
             int count, int after) {
           }

           @Override    
           public void onTextChanged(CharSequence s, int start,
             int before, int count) {
               if( -1 != input.getText().toString().indexOf( \"\\n\" ) ){
                   input.setText(\"Enter was pressed!\");
                    }
           }
          });

回答17:

A dependable way to respond to an <enter> in an EditText is with a TextWatcher, a LocalBroadcastManager, and a BroadcastReceiver. You need to add the v4 support library to use the LocalBroadcastManager. I use the tutorial at vogella.com: 7.3 \"Local broadcast events with LocalBroadcastManager\" because of its complete concise code Example. In onTextChanged before is the index of the end of the change before the change>;minus start. When in the TextWatcher the UI thread is busy updating editText\'s editable, so we send an Intent to wake up the BroadcastReceiver when the UI thread is done updating editText.

import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.text.Editable;
//in onCreate:
editText.addTextChangedListener(new TextWatcher() {
  public void onTextChanged
  (CharSequence s, int start, int before, int count) {
    //check if exactly one char was added and it was an <enter>
    if (before==0 && count==1 && s.charAt(start)==\'\\n\') {
    Intent intent=new Intent(\"enter\")
    Integer startInteger=new Integer(start);
    intent.putExtra(\"Start\", startInteger.toString()); // Add data
    mySendBroadcast(intent);
//in the BroadcastReceiver\'s onReceive:
int start=Integer.parseInt(intent.getStringExtra(\"Start\"));
editText.getText().replace(start, start+1,\"\"); //remove the <enter>
//respond to the <enter> here

回答18:

Jared Law\'s answer works like a charm for me.

just added these depencendy:

import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;

回答19:

InputType on the textfield must be text in order for what CommonsWare said to work. Just tried all of this, no inputType before the trial and nothing worked, Enter kept registering as soft enter. After inputType = text, everything including the setImeLabel worked.

Example : android:inputType=\"text\"

回答20:

Here\'s a simple static function that you can throw into your Utils or Keyboards class that will execute code when the user hits the return key on a hardware or software keyboard. It\'s a modified version of @earlcasper\'s excellent answer

 /**
 * Return a TextView.OnEditorActionListener that will execute code when an enter is pressed on
 * the keyboard.<br>
 * <code>
 *     myTextView.setOnEditorActionListener(Keyboards.onEnterEditorActionListener(new Runnable()->{
 *         Toast.makeText(context,\"Enter Pressed\",Toast.LENGTH_SHORT).show();
 *     }));
 * </code>
 * @param doOnEnter A Runnable for what to do when the user hits enter
 * @return the TextView.OnEditorActionListener
 */
public static TextView.OnEditorActionListener onEnterEditorActionListener(final Runnable doOnEnter){
    return (__, actionId, event) -> {
        if (event==null) {
            if (actionId == EditorInfo.IME_ACTION_DONE) {
                // Capture soft enters in a singleLine EditText that is the last EditText.
                doOnEnter.run();
                return true;
            } else if (actionId==EditorInfo.IME_ACTION_NEXT) {
                // Capture soft enters in other singleLine EditTexts
                doOnEnter.run();
                return true;
            } else {
                return false;  // Let system handle all other null KeyEvents
            }
        } else if (actionId==EditorInfo.IME_NULL) {
            // Capture most soft enters in multi-line EditTexts and all hard enters.
            // They supply a zero actionId and a valid KeyEvent rather than
            // a non-zero actionId and a null event like the previous cases.
            if (event.getAction()==KeyEvent.ACTION_DOWN) {
                // We capture the event when key is first pressed.
                return true;
            } else {
                doOnEnter.run();
                return true;   // We consume the event when the key is released.
            }
        } else {
            // We let the system handle it when the listener
            // is triggered by something that wasn\'t an enter.
            return false;
        }
    };
}