Android CharacterPickerDialog Tutorial with Examples
1. Android CharacterPickerDialog
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Android CharacterPickerDialog is a dialog box that permits the user to select "accented characters" of a base character. Oftentimes, the CharacterPickerDialog is useful because not all of the phones have the Keyboard Layout that is appropriate for a particular language.
For example, Vietnamese language has a list of many accented characters, which probably look strange for you:
a á à ã ả ạ ă ắ ằ ẵ ẳ ặ â ấ ầ ẫ ẩ ậ
A Á À Ã Ả Ạ Ă Ắ Ằ Ẵ Ẳ Ặ Â Ấ Ầ Ẫ Ẩ Ậ
d đ
D Đ
e é è ẽ ẻ ẹ ê ế ề ễ ể ệ
E É È Ẽ Ẻ Ẹ Ê Ế Ề Ễ Ể Ệ
i í ì ĩ ỉ ị
I Í Ì Ĩ Ỉ Ị
o ó ò õ ỏ ọ ô ố ồ ỗ ổ ộ ơ ớ ờ ỡ ở ợ
O Ó Ò Õ Ỏ Ọ Ô Ố Ồ Ỗ Ổ Ộ Ơ Ớ Ờ Ỡ Ở Ợ
u ú ù ũ ủ ụ ư ứ ừ ữ ử ự
U Ú Ù Ũ Ủ Ụ Ư Ứ Ừ Ữ Ử Ự
y ý ỳ ỹ ỷ ỵ
Y Ý Ỳ Ỹ Ỷ Ỵ
Here are some special characters in German:
↵
ä ö ü ß
And some special characters in French:
à â æ ç é è ê ë ï î ô œ ù û ü ÿ
2. Example of CharacterPickerDialog
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Here is a simple application that uses CharacterPickerDialog to assist the user to select the special characters in Vietnamese.
Create a new project on Android Studio:
- File > New > New Project > Empty Activity
- Name: CharacterPickerDialogExample
- Package name: org.o7planning.characterpickerexample
- Language: Java
This is what the interface of the application looks like:
activity_main.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=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="32dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="Enter your name:"
android:textSize="22sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/editText"
android:layout_width="0dp"
android:layout_height="51dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:ems="10"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package org.o7planning.characterpickerdialogexample;
import android.os.Bundle;
import android.text.Editable;
import android.text.method.CharacterPickerDialog;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private static final String LOG_TAG = "AndroidExample";
private EditText editText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.editText = this.findViewById(R.id.editText);
this.editText.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
return handleOnKey( keyCode, event);
}
});
}
private boolean handleOnKey(int keyCode, KeyEvent event) {
if(event.getAction() == KeyEvent.ACTION_DOWN) {
return false;
}
char base = (char) event.getUnicodeChar();
Log.i(LOG_TAG, "keyCode: " + keyCode + ", Base character: " + base);
final String accentedString = AccentedStringUtils.getAccentedString(base);
if(accentedString == null) {
return false;
}
final Editable editable = this.editText.getText();
CharacterPickerDialog dialog= new CharacterPickerDialog(this, new View(this), editable, accentedString,false) {
// User click on Cancel button.
@Override
public void onClick (View v) {
// Do something here
// ...
super.onClick(v);
}
// User click on Character button.
@Override
public void onItemClick(AdapterView parent, View view, int position, long id){
// Do something here
// ...
super.onItemClick(parent, view, position, id);
}
};
dialog.show();
return false;
}
}
AccentedStringUtils.java
package org.o7planning.characterpickerdialogexample;
public class AccentedStringUtils {
//
// Vietnamese special characters.
//
private static final String[] ACCENTED_STRINGS = {
"aáàãảạăắằẵẳặâấầẫẩậ",
"AÁÀÃẢẠĂẮẰẴẲẶÂẤẦẪẨẬ",
"dđ",
"DĐ",
"eéèẽẻẹêếềễểệ",
"EÉÈẼẺẸÊẾỀỄỂỆ",
"iíìĩỉị",
"IÍÌĨỈỊ",
"oóòõỏọôốồỗổộơớờỡởợ",
"OÓÒÕỎỌÔỐỒỖỔỘƠỚỜỠỞỢ",
"uúùũủụưứừữửự",
"UÚÙŨỦỤƯỨỪỮỬỰ",
"yýỳỹỷỵ",
"YÝỲỸỶỴ"
};
public static String getAccentedString(char base) {
for(int i = 0; i< ACCENTED_STRINGS.length; i++) {
String accentedString = ACCENTED_STRINGS[i];
if(accentedString.charAt(0) == base) {
return accentedString;
}
}
return null;
}
}
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