Android - 焦点导航后退按钮

标签 android kotlin android-edittext focus back-button

我有以下看法:

Verification View

当我单击其中一个编辑文本时，会出现一个软键盘。关闭此键盘后，单击后退导航按钮没有反应。在我点击其中一个编辑文本之前，我的后退按钮工作正常。

我的“验证” fragment 的代码:

class VerifyPhoneFragment : Fragment() {

lateinit var appContext: Context
private var editTexts: ArrayList<EditText> = ArrayList()
private var focusedElement: Int = 0
private var verifyButton: TextView? = null

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {
    val view = inflater.inflate(R.layout.fragment_verify_phone, container, false)

    val backButton = view.findViewById<TextView>(R.id.backButtonAbout)
    backButton.setOnClickListener {
        activity!!.onBackPressed()
    }

    verifyButton = view.findViewById(R.id.btn_verify)
    verifyButton?.setOnClickListener {
        val dataConnection = DataConnection()
        var code: String = ""
        editTexts.forEach {
            code += it.text.toString()
        }

        dataConnection.doGet("/phone/verification",
                hashMapOf("token" to code),
                { result: Any?, message: String ->
                    activity!!.runOnUiThread {
                        Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
                        if(result != null && result is Boolean && result)
                            activity!!.onBackPressed()
                    }

                }, Boolean::class.java)
    }


    editTexts.add(view.findViewById(R.id.editText1))
    editTexts.add(view.findViewById(R.id.editText2))
    editTexts.add(view.findViewById(R.id.editText3))
    editTexts.add(view.findViewById(R.id.editText4))
    editTexts.add(view.findViewById(R.id.editText5))
    editTexts.add(view.findViewById(R.id.editText6))

    editTexts.forEach { et ->
        et.isEnabled = false
        et.setOnKeyListener(object : View.OnKeyListener {
            override fun onKey(v: View, keyCode: Int, event: KeyEvent): Boolean {
                if (keyCode == KeyEvent.KEYCODE_DEL && event.action !=KeyEvent.ACTION_DOWN) {
                    if((focusedElement > 0 && focusedElement != 5) || (focusedElement == 5 && editTexts[focusedElement].text.toString().length == 0)) {
                        focusedElement--
                        editTexts[focusedElement].isEnabled = true
                        editTexts[focusedElement].requestFocus()
                        editTexts[focusedElement].setText("")
                        editTexts[focusedElement+1].isEnabled = false
                    }
                    else if(focusedElement == 5 && editTexts[focusedElement].text.toString().length != 0){
                        editTexts[focusedElement].setText("")
                    }
                }
                else if(keyCode >= 7 && keyCode <= 16 && event.action !=KeyEvent.ACTION_DOWN){
                    if(focusedElement < 5)
                    {
                        editTexts[focusedElement].setText((keyCode - 7).toString())
                        focusedElement++
                        editTexts[focusedElement].isEnabled = true
                        editTexts[focusedElement].requestFocus()
                        editTexts[focusedElement-1].isEnabled = false
                    }
                    else {
                        editTexts[focusedElement].setText((keyCode - 7).toString())
                        editTexts[focusedElement].clearFocus()
                        hideKeyboard(editTexts[focusedElement])
                    }
                }
                checkIfVerifyShouldBeEnabled()
                return true
            }
        })
    }
    editTexts[focusedElement].isEnabled = true

    return view
}

private fun hideKeyboard(view: View) {
    val imm = view.context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
    imm.hideSoftInputFromWindow(view.windowToken, 0)
}

private fun checkIfVerifyShouldBeEnabled(){
    if(editTexts[5].text.toString().length > 0) {
        verifyButton?.isEnabled = true
        verifyButton?.setTextColor(resources.getColor(R.color.white))
    }
    else{
        verifyButton?.isEnabled = false
        verifyButton?.setTextColor(resources.getColor(R.color.grey))
    }

}

override fun onAttach(context: Context?) {
    super.onAttach(context)
    appContext = context!!
}
}

此 fragment 的布局代码:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@drawable/background_payment_1">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar6"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    app:contentInsetStart="0dp">

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/backButtonAbout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginStart="10dp"
            android:includeFontPadding="false"
            android:text="@string/cancel"
            android:textColor="@color/white"
            android:textSize="19sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.3" />

        <TextView
            android:id="@+id/btn_verify"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginEnd="10dp"
            android:includeFontPadding="false"
            android:text="@string/verify"
            android:textColor="@color/grey"
            android:textSize="19sp"
            android:enabled="false"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.3" />

    </android.support.constraint.ConstraintLayout>
</android.support.v7.widget.Toolbar>

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:layout_marginBottom="80dp"
    android:text="@string/verification_code"
    android:textColor="@color/white"
    style="@style/ToolBarHeaderText"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.5"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.49"
    app:layout_constraintVertical_chainStyle="spread" />

<TextView
    android:id="@+id/textView4"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:text="@string/message_phone_verification"
    android:textAlignment="center"
    android:textSize="18sp"
    android:textColor="@color/white"
    app:layout_constraintEnd_toEndOf="@+id/linearLayout"
    app:layout_constraintStart_toStartOf="@+id/linearLayout"
    app:layout_constraintTop_toBottomOf="@+id/textView3" />

<android.support.constraint.ConstraintLayout
    android:id="@+id/linearLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="45dp"
    android:layout_marginTop="30dp"
    android:layout_marginEnd="45dp"
    android:orientation="horizontal"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView4">

    <android.support.v7.widget.CardView
        android:id="@+id/cv1"
        android:layout_width="40dp"
        android:layout_height="50dp"
        android:backgroundTint="#76FFFFFF"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/cv2"
        app:layout_constraintHorizontal_chainStyle="spread_inside"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:cardCornerRadius="5dp"
        app:cardElevation="0dp">

        <EditText
            android:id="@+id/editText1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textColor="@color/white"
            android:background="@color/transparent"
            android:textAlignment="center"
            android:inputType="number"/>

    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        android:id="@+id/cv2"
        android:layout_width="40dp"
        android:layout_height="50dp"
        android:backgroundTint="#76FFFFFF"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/cv3"
        app:layout_constraintStart_toEndOf="@+id/cv1"
        app:layout_constraintTop_toTopOf="parent"
        app:cardCornerRadius="5dp"
        app:cardElevation="0dp">

        <EditText
            android:id="@+id/editText2"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textColor="@color/white"
            android:background="@color/transparent"
            android:textAlignment="center"
            android:inputType="number"/>

    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        android:id="@+id/cv3"
        android:layout_width="40dp"
        android:layout_height="50dp"
        android:backgroundTint="#76FFFFFF"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/cv4"
        app:layout_constraintStart_toEndOf="@+id/cv2"
        app:layout_constraintTop_toTopOf="parent"
        app:cardCornerRadius="5dp"
        app:cardElevation="0dp">

        <EditText
            android:id="@+id/editText3"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textColor="@color/white"
            android:background="@color/transparent"
            android:textAlignment="center"
            android:inputType="number"/>

    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        android:id="@+id/cv4"
        android:layout_width="40dp"
        android:layout_height="50dp"
        android:backgroundTint="#76FFFFFF"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/cv5"
        app:layout_constraintStart_toEndOf="@+id/cv3"
        app:layout_constraintTop_toTopOf="parent"
        app:cardCornerRadius="5dp"
        app:cardElevation="0dp">

        <EditText
            android:id="@+id/editText4"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textColor="@color/white"
            android:background="@color/transparent"
            android:textAlignment="center"
            android:inputType="number"/>

    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        android:id="@+id/cv5"
        android:layout_width="40dp"
        android:layout_height="50dp"
        android:backgroundTint="#76FFFFFF"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/cv6"
        app:layout_constraintStart_toEndOf="@+id/cv4"
        app:layout_constraintTop_toTopOf="parent"
        app:cardCornerRadius="5dp"
        app:cardElevation="0dp"
        android:inputType="number">

        <EditText
            android:id="@+id/editText5"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textColor="@color/white"
            android:background="@color/transparent"
            android:textAlignment="center"
            android:inputType="number"/>

    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        android:id="@+id/cv6"
        android:layout_width="40dp"
        android:layout_height="50dp"
        android:backgroundTint="#76FFFFFF"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/cv5"
        app:layout_constraintTop_toTopOf="parent"
        app:cardCornerRadius="5dp"
        app:cardElevation="0dp">

        <EditText
            android:id="@+id/editText6"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textColor="@color/white"
            android:background="@color/transparent"
            android:textAlignment="center"
            android:inputType="number"/>

    </android.support.v7.widget.CardView>

</android.support.constraint.ConstraintLayout>


</android.support.constraint.ConstraintLayout>

所以我的问题是，如何获得导航后退按钮的焦点？还是根本就是焦点问题？ 顺便说一句，取消按钮总是能正常工作!

最佳答案

我发现了问题。当用户手动关闭键盘时，焦点仍位于当前编辑文本上。因此，当他随后按下导航后退按钮时，将触发 onKey 事件，但我没有处理后退键事件。 所以我只是添加了以下代码，一切正常:

else if(keyCode == KeyEvent.KEYCODE_BACK && event.action != KeyEvent.ACTION_DOWN){
     activity?.onBackPressed()
}

关于Android - 焦点导航后退按钮，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53721883/

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