java - 为什么我的文本更改侦听器不起作用？
问题描述
为什么我在 android 上的“addTextChangedListener”不起作用？这是我的代码：
activity_ticketing.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".TicketingMain.Ticketing">
<!-- Main Content -->
<!-- HEADING -->
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/button_logout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="16dp"
android:layout_marginStart="28dp"
android:layout_marginBottom="100dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:srcCompat="@drawable/icon_exit" />
<com.google.android.material.card.MaterialCardView
android:id="@+id/materialCardView"
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_marginStart="16dp"
android:layout_marginTop="24dp"
android:layout_marginEnd="16dp"
android:minHeight="200dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textView_route"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="28dp"
android:text="Tacloban - Tanawan"
android:textSize="14sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.285" />
<TextView
android:id="@+id/textView_vehicle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginBottom="16dp"
android:text="ZZZ999"
android:textSize="14sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="@+id/textView_route"
app:layout_constraintStart_toStartOf="@+id/textView_route"
app:layout_constraintTop_toBottomOf="@+id/textView_route" />
<TextView
android:id="@+id/textView_driver"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:text="Driver Name"
android:textSize="14sp"
android:textStyle="bold"
app:layout_constraintStart_toEndOf="@+id/textView_route"
app:layout_constraintTop_toTopOf="@+id/textView_route" />
<TextView
android:id="@+id/textView_conductor"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="8dp"
android:text="Conductor Name"
android:textSize="14sp"
android:textStyle="bold"
app:layout_constraintStart_toEndOf="@+id/textView_vehicle"
app:layout_constraintTop_toBottomOf="@+id/textView_driver" />
<TextView
android:id="@+id/textView_numberOfPassengers"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:text="0"
android:textSize="24sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/textView3"
app:layout_constraintTop_toBottomOf="@+id/textView3" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginEnd="8dp"
android:text="Passengers"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.card.MaterialCardView>
<!-- HEADING END -->
<!-- ROUTEPOST ORIGIN -->
<!-- ROUTEPOST ORIGIN END -->
<!-- MAIN -->
<com.google.android.material.card.MaterialCardView
android:id="@+id/materialCardView2"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:layout_marginBottom="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/materialCardView">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- spinner_direction -->
<Spinner
android:id="@+id/spinner_direction"
android:layout_width="200dp"
android:layout_height="0dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:textAlignment="center"
app:layout_constraintBottom_toBottomOf="@+id/textView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/textView"
app:layout_constraintTop_toTopOf="parent" />
<!-- textView_currentPost -->
<TextView
android:id="@+id/textView_currentPost"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:background="@drawable/border_box"
android:text="Current"
android:textAlignment="center"
android:textAllCaps="true"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="@+id/button_prev"
app:layout_constraintEnd_toStartOf="@+id/button_next"
app:layout_constraintStart_toEndOf="@+id/button_prev"
app:layout_constraintTop_toTopOf="@+id/button_prev" />
<!-- button_next -->
<com.google.android.material.button.MaterialButton
android:id="@+id/button_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:textAlignment="center"
app:icon="@drawable/ic_right_arrow"
app:iconGravity="textStart"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/textView_currentPost"
app:layout_constraintTop_toBottomOf="@+id/spinner_direction" />
<!-- button_prev -->
<com.google.android.material.button.MaterialButton
android:id="@+id/button_prev"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:textAlignment="center"
android:textStyle="bold"
app:icon="@drawable/ic_left"
app:iconGravity="textStart"
app:layout_constraintEnd_toStartOf="@+id/textView_currentPost"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/spinner_direction" />
<!-- button_postCurrentRoutePost -->
<!-- button_logout -->
<!-- textView = "Direction" -->
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:text="Direction"
android:textSize="24sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<!-- textView_currentLocation -->
<TextView
android:id="@+id/textView_currentLocation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="No current location set"
android:textSize="24sp"
app:layout_constraintEnd_toEndOf="@+id/button_next"
app:layout_constraintStart_toStartOf="@+id/button_prev"
app:layout_constraintTop_toBottomOf="@+id/textView_currentPost" />
<!-- button_nextDestination -->
<com.google.android.material.button.MaterialButton
android:id="@+id/button_nextDestination"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:textAlignment="center"
app:icon="@drawable/ic_right_arrow"
app:iconGravity="textStart"
app:layout_constraintEnd_toEndOf="@+id/textView_currentLocation"
app:layout_constraintStart_toEndOf="@+id/textView_currentPost"
app:layout_constraintTop_toBottomOf="@+id/textView_currentLocation" />
<!-- button_prevDestination -->
<com.google.android.material.button.MaterialButton
android:id="@+id/button_prevDestination"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:clickable="true"
android:textAlignment="center"
android:textStyle="bold"
app:icon="@drawable/ic_left"
app:iconGravity="textStart"
app:layout_constraintEnd_toStartOf="@+id/textView_currentPost"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView_currentLocation" />
<!-- textView_currentPostDestination -->
<TextView
android:id="@+id/textView_currentPostDestination"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:background="@drawable/border_box"
android:text="Current"
android:textAlignment="center"
android:textAllCaps="true"
android:textSize="20sp"
android:textStyle="bold"
android:clickable="true"
android:onClick="onClick"
app:layout_constraintBottom_toBottomOf="@+id/button_prevDestination"
app:layout_constraintEnd_toStartOf="@+id/button_nextDestination"
app:layout_constraintStart_toEndOf="@+id/button_prevDestination"
app:layout_constraintTop_toTopOf="@+id/button_nextDestination" />
<com.google.android.material.button.MaterialButton
android:id="@+id/button_postDestination"
style="@style/Widget.MaterialComponents.Button"
android:layout_width="0dp"
android:layout_height="65dp"
android:layout_marginTop="8dp"
android:text="Submit Destination"
android:textAlignment="center"
app:iconGravity="textStart"
app:layout_constraintEnd_toEndOf="@+id/button_nextDestination"
app:layout_constraintStart_toStartOf="@+id/textView_currentPostDestination"
app:layout_constraintTop_toBottomOf="@+id/textView_currentPostDestination" />
<!-- RECEIPT -->
<com.google.android.material.card.MaterialCardView
android:id="@+id/materialCardView3"
android:layout_width="347dp"
android:layout_height="332dp"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button_postDestination">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
android:layout_marginTop="24dp"
android:text="Destination"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView_receiptDestination"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:text="Tacloban - Tanawan"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintStart_toEndOf="@+id/textView4"
app:layout_constraintTop_toTopOf="@+id/textView4" />
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:text="Passengers"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="@+id/textView4"
app:layout_constraintTop_toBottomOf="@+id/textView4" />
<TextView
android:id="@+id/textView_receiptPassengers"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:text="0"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintStart_toEndOf="@+id/textView6"
app:layout_constraintTop_toTopOf="@+id/textView6" />
<TextView
android:id="@+id/textView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:text="Fare"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="@+id/textView6"
app:layout_constraintTop_toBottomOf="@+id/textView6" />
<TextView
android:id="@+id/textView_receiptFare"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0.00"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="@+id/textView_receiptPassengers"
app:layout_constraintTop_toTopOf="@+id/textView8" />
<TextView
android:id="@+id/textView10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:text="Total Due"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="@+id/textView8"
app:layout_constraintTop_toBottomOf="@+id/textView8" />
<TextView
android:id="@+id/textView_receiptTotal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0.00"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="@+id/textView_receiptFare"
app:layout_constraintTop_toTopOf="@+id/textView10" />
<com.google.android.material.card.MaterialCardView
android:id="@+id/materialCardView4"
android:layout_width="108dp"
android:layout_height="97dp"
android:layout_marginEnd="8dp"
app:layout_constraintBottom_toBottomOf="@+id/textView_receiptTotal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView_receiptDestination">
<ImageView
android:id="@+id/imageView_qrCode"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true" />
</com.google.android.material.card.MaterialCardView>
<RadioGroup
android:id="@+id/radioGroup_discount"
android:layout_width="205dp"
android:layout_height="106dp"
android:layout_marginEnd="140dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView10"
app:layout_constraintVertical_bias="0.615">
<RadioButton
android:id="@+id/radioButton_noDiscount"
android:layout_width="128dp"
android:layout_height="wrap_content"
android:layout_marginStart="60dp"
android:checked="true"
android:text="No Discount"
android:textSize="12sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView10" />
<RadioButton
android:id="@+id/radioButton_ssDiscount"
android:layout_width="125dp"
android:layout_height="wrap_content"
android:layout_marginStart="60dp"
android:text="Senior/Student"
android:textSize="12sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView10" />
<RadioButton
android:id="@+id/radioButton_spDiscount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="60dp"
android:text="Special Discount"
android:textSize="12sp"
android:textStyle="bold" />
</RadioGroup>
<Button
android:id="@+id/button_accept"
android:layout_width="108dp"
android:layout_height="74dp"
android:text="Accept"
app:backgroundTint="#009688"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="@+id/materialCardView4"
app:layout_constraintStart_toStartOf="@+id/materialCardView4"
app:layout_constraintTop_toBottomOf="@+id/materialCardView4" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.card.MaterialCardView>
<!-- <SearchView-->
<!-- android:layout_width="0dp"-->
<!-- android:layout_height="0dp"-->
<!-- android:id="@+id/search"-->
<!-- app:layout_constraintBottom_toBottomOf="@+id/button_postDestination"-->
<!-- app:layout_constraintEnd_toEndOf="@+id/button_prevDestination"-->
<!-- app:layout_constraintStart_toStartOf="@+id/button_prevDestination"-->
<!-- app:layout_constraintTop_toTopOf="@+id/button_postDestination" />-->
<com.google.android.material.textfield.TextInputLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:id="@+id/editText"
app:layout_constraintBottom_toBottomOf="@+id/button_postDestination"
app:layout_constraintEnd_toEndOf="@+id/button_prevDestination"
app:layout_constraintStart_toStartOf="@+id/button_prevDestination"
app:layout_constraintTop_toBottomOf="@+id/button_prevDestination">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/textKm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Km" />
</com.google.android.material.textfield.TextInputLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.card.MaterialCardView>
<!-- MAIN END -->
<!-- MAIN -->
<!-- HEADING -->
<!-- LOGOUT -->
<!-- LOGOUT END -->
</androidx.constraintlayout.widget.ConstraintLayout>
票务.java
EditText editText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ticketing);
editText = (EditText) findViewById(R.id.textKm);
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
Log.e("TEXT", "A");
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.e("TEXT", "A");
}
@Override
public void afterTextChanged(Editable s) {
Log.e("TEXT", "A");
}
});
}
我没有收到任何错误。在调试时，它不会在任何覆盖上停止。
解决方案
您可以设置拖曳方式
第一种方式：
EditText et_auto_complete_edit_text;
et_auto_complete_edit_text = findViewById(R.id.et_auto_complete_edit_text);
et_auto_complete_edit_text.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
s.toString()
}
});
XML:
<EditText
android:id="@+id/et_auto_complete_edit_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_weight="8"
android:background="@color/gray_light_EA"
android:drawableRight="@mipmap/ic_search_new"
android:drawablePadding="@dimen/margin5dp"
android:hint="Search here"
android:inputType="text"
android:maxLines="1"
android:padding="10dp"
android:textColor="@color/black"
android:textColorHint="@color/grey"
android:visibility="visible" />
第二种方式：
SearchView search;
search = findViewById(R.id.search);
search.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
fetchData(query);
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
//collectionProductsListAdapter.getFilter().filter(newText);
return false;
}
});
search.setOnSearchClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
search.setOnCloseListener(new SearchView.OnCloseListener() {
@Override
public boolean onClose() {
return false;
}
});
XML:
<androidx.appcompat.widget.SearchView
xmlns:n2="http://schemas.android.com/tools"
android:id="@+id/search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
n2:searchIcon="@mipmap/ic_et_search" />
希望这可以帮助你第一种方法更容易。
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