问题
I'm new to working with Chips in Android. I want to get the selected Chips from a ChipGroup when I click a button. Made is someway work with checking every Chip and add it to a Set, but want to make it more efficient. Somehow I didn't find an answer to my question myself.
There is also an error when I check 2 Chips and uncheck the first one I checked.
Here my code:
<com.google.android.material.chip.ChipGroup
android:id="@+id/chipGroup"
android:layout_width="300dp"
android:layout_height="wrap_content"
>
<com.google.android.material.chip.Chip
android:id="@+id/chip1"
style="@style/Widget.MaterialComponents.Chip.Filter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
android:backgroundTint="#99FFFFFF"
/>
<com.google.android.material.chip.Chip
android:id="@+id/chip2"
style="@style/Widget.MaterialComponents.Chip.Filter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
android:backgroundTint="#99FFFFFF"/>
<com.google.android.material.chip.Chip
android:id="@+id/chip3"
style="@style/Widget.MaterialComponents.Chip.Filter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
android:backgroundTint="#99FFFFFF"/>
<com.google.android.material.chip.Chip
android:id="@+id/chip4"
style="@style/Widget.MaterialComponents.Chip.Filter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4"
android:backgroundTint="#99FFFFFF"/>
<com.google.android.material.chip.Chip
android:id="@+id/chip5"
style="@style/Widget.MaterialComponents.Chip.Filter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="5"
android:backgroundTint="#99FFFFFF"/>
</com.google.android.material.chip.ChipGroup>
Set<Integer> chipIds = new HashSet<>();
int chip1Id= 1;
int chip2Id= 2;
int chip3Id= 3;
int chip4Id= 4;
int chip5Id= 5;
chip1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
chipIds.add(chip1Id);
} else {
for (int i : chipIds) {
if (i == chip1Id) {
chipIds.remove(i);
}
}
}
}
});
chip2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
chipIds.add(chip2Id);
} else {
for (int i : chipIds) {
if (i == chip2Id) {
chipIds.remove(i);
}
}
}
}
});
chip3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
chipIds.add(chip3Id);
} else {
for (int i : chipIds) {
if (i == chip3Id) {
chipIds.remove(i);
}
}
}
}
});
chip4.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
chipIds.add(chip4Id);
} else {
for (int i : chipIds) {
if (i == chip4Id) {
chipIds.remove(i);
}
}
}
}
});
chip5.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
chipIds.add(chip5Id);
} else {
for (int i : chipIds) {
if (i == chip5Id) {
chipIds.remove(i);
}
}
}
}
});
回答1:
Here is my solution:
- just for test results, I´ve added a button in XML
<Button
android:id="@+id/bShow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/chipGroup"
android:layout_margin="10dp"
android:text="Show Checked"
android:onClick="buttonPressed"/>
- Java: just for the test, be sure you include:
import android.widget.Button;
import android.widget.Toast;
import android.view.View;
- Java: add the following code
showResult = (Button) findViewById(R.id.bShow);
showResult.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v) {
String msg = "Chips checked are:";
ChipGroup chg = findViewById(R.id.chipGroup);
int chipsCount = chg.getChildCount();
if (chipsCount == 0) {
msg += " None!!";
} else {
int i = 0;
while (i < chipsCount) {
Chip chip = (Chip) chg.getChildAt(i);
if (chip.isChecked() ) {
msg += chip.getText().toString() + " " ;
}
i++;
};
}
// show message
Toast.makeText(getApplicationContext(),msg, Toast.LENGTH_LONG).show();
}
});
回答2:
ChipGroup does not have any method to return multiple selected chips. So you can use the traditional way by looping all child inside the parent and check whether it is checked or not.
for (index in 0 until mBinding.bookingIncludeCg.childCount) {
val chip:Chip = mBinding.bookingIncludeCg.getChildAt(index) as Chip
when(chip.id) {
R.id.free_cancellation_chip -> hotelFilter.freeCancellation = chip.isChecked
R.id.free_breakfast_chip -> hotelFilter.freeBreakfast = chip.isChecked
R.id.free_wifi -> hotelFilter.freeWifi = chip.isChecked
}
}
And the XML
<android.support.design.chip.ChipGroup
android:id="@+id/booking_include_cg"
android:layout_marginTop="@dimen/spacing_16"
app:layout_constraintTop_toBottomOf="@+id/booking_include_label"
app:layout_constraintLeft_toLeftOf="@id/guidelineLeft"
app:layout_constraintRight_toRightOf="@id/guidelineRight"
android:layout_width="0dp"
android:layout_height="wrap_content">
<android.support.design.chip.Chip
android:id="@+id/free_cancellation_chip"
style="@style/HotelFilterChipStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:chipText="@string/free_cancellation" />
<android.support.design.chip.Chip
android:id="@+id/free_breakfast_chip"
style="@style/HotelFilterChipStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:chipText="@string/free_breakfast" />
<android.support.design.chip.Chip
android:id="@+id/free_wifi"
style="@style/HotelFilterChipStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:chipText="@string/free_wifi" />
</android.support.design.chip.ChipGroup>
来源：https://stackoverflow.com/questions/55905793/get-selected-chips-from-a-chipgroup