I want to add a button to decrease the numbers in the list view, and I don't want the number to go down from zero.
NightActivity:
public class NightActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_night);
final ArrayList<Word> words = new ArrayList<>();
words.add(new Word("Thing", "another Thing", 1)); // <--- This number I want to decrease it.
words.add(new Word("ThingOne","another ThingOne", 3)); // <--- This number I want to decrease it.
words.add(new Word("ThingTwo", "another ThingTwo", 3)); // <--- This number I want to decrease it.
words.add(new Word("ThingThree", "another ThingThree", 3)); // <--- This number I want to decrease it.
words.add(new Word("ThingFour", "another ThingFour", 1)); // <--- This number I want to decrease it.
WordAdapter adapter = new WordAdapter(this, words);
ListView listView = findViewById(R.id.list);
listView.setAdapter(adapter);
}
}
Word:
public class Word {
private final String name;
private final String extraText;
private final int repetition;
public Word(String name, String extraText, int repetition) {
this.name = name;
this.extraText = extraText;
this.repetition = repetition;
}
public String getName() {
return name;
}
public String getExtraText() {
return extraText;
}
public int getRepetition() {
return repetition;
}
}
WordAdapter:
public class WordAdapter extends ArrayAdapter<Word> {
public WordAdapter(Activity context, ArrayList<Word> words) {
super(context, 0, words);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
}
Word currentWord = getItem(position);
TextView nameTextView = listItemView.findViewById(R.id.name_text);
nameTextView.setText(currentWord.getname());
TextView extraTextView = listItemView.findViewById(R.id.extra_text);
extraTextView.setText(currentWord.getExtraText());
TextView repetitions = listItemView.findViewById(R.id.number_of_repetitions);
String formattedRepetition = formatRepetition(currentWord.getRepetition());
repetitions.setText(formattedRepetition);
return listItemView;
}
private String formatRepetition(int repetition) {
DecimalFormat repetitionFormat = new DecimalFormat("0");
return repetitionFormat.format(repetition);
}
}
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/corner"
android:padding="10dp">
<TextView
android:id="@ id/name_text"
style="@style/nameText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_below="@id/extra_text"
android:gravity="center">
<TextView
android:id="@ id/number_of_repetitions"
style="@style/repetition"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="2"
android:textStyle="bold"/>
<Button
android:id="@ id/button_repetitions"
android:layout_width="90dp"
android:layout_height="50dp"
android:text="button"/>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="13dp">
<TextView
android:id="@ id/morning"
style="@style/night"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:background="@drawable/night_corner"
android:text="@string/category_night" />
<View
android:id="@ id/divider"
android:layout_width="match_parent"
android:layout_height="13dp" />
<TextView
android:id="@ id/evening"
style="@style/day"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2"
android:background="@drawable/day_corner"
android:text="@string/category_day" />
</LinearLayout>
</ScrollView>
I added a button, but I don't know how to activate it, and I don't know where I will put onClickListener, I am a beginner so please help me and thank you for reading my code.
CodePudding user response：
First of all, to change the value of repetition of the word, you have to create a setter for repetition in the Word class as below:
public class Word {
.....
..... // your code including constructor & getters
.....
public void setRepetition(int repetition)
{
this.repetition = repetition;
}
}
Now, to change the value of repetition on the button's click, apply onClickListener on the button in WordAdapter.java as below:
public class WordAdapter extends ArrayAdapter<Word> {
.....
..... // your code
.....
@Override
public View getView(int position, View convertView, ViewGroup parent) {
.....
..... // your code
.....
listItemView.btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int current_repetition = currentWord.getRepetition();
if (current_repetition > 0)
currentWord.setRepetition(current_repetition - 1)
listItemView.textView.setText(currentWord.getRepetition())
}
});
return listItemView;
}
}
Try this and tell whether it works or not.
CodePudding user response：
First of all you should use recyclerview instead of list view. To decrease your number you must add button to list_item, and set click listener
CodePudding user response：
I didn't clearly understand what you want, but as far as I understand you want when you press the button it will subtract the number in the repetitions by one. Well we will add a button variable in the wordAdaptor activity, we know it, and then we will do the setOnclickListener event, then we start the rest of the process, this code after modification and I added a condition that if the number reaches zero its stop
public class WordAdapter extends ArrayAdapter {
public WordAdapter(Activity context, ArrayList<Word> words) {
super(context, 0, words);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
}
Word currentWord = getItem(position);
TextView nameTextView = listItemView.findViewById(R.id.name_text);
nameTextView.setText(currentWord.getName());
TextView extraTextView = listItemView.findViewById(R.id.extra_text);
extraTextView.setText(currentWord.getExtraText());
TextView repetitions = listItemView.findViewById(R.id.number_of_repetitions);
String formattedRepetition = formatRepetition(currentWord.getRepetition());
repetitions.setText(formattedRepetition);
Button bRepetitions = listItemView.findViewById(R.id.button_repetitions);
bRepetitions.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int nRepetitions;
String mRepetitions = repetitions.getText().toString();
nRepetitions = Integer.parseInt(mRepetitions);
nRepetitions -= 1;
if (nRepetitions < 0) {
nRepetitions = 0;
Toast.makeText(getContext(), "Can not be less than 0", Toast.LENGTH_SHORT).show();}
repetitions.setText(String.valueOf(nRepetitions));
}
});
return listItemView;
}
private String formatRepetition(int repetition) {
DecimalFormat repetitionFormat = new DecimalFormat("0");
return repetitionFormat.format(repetition);
}
}