numeric soft keyboard in android using ndk - java-native-interface

Question

I have a java code that displays the numeric soft keyboard in Android:
public class MainActivity extends Activity {
EditText ed1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ed1 = (EditText) findViewById(R.id.editText1);
ed1.setInputType(InputType.TYPE_CLASS_NUMBER);
}
}
My activity_main.xml file:
<RelativeLayout 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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="numberkeypad.inputmethod.MainActivity" >
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:ems="10" >
</EditText>
The output is: numeric soft keyboard
I want to display the same keyboard using NDK JNI call and no EditText. I have implemented the default keyboard in this way using the following link:
How to show the soft keyboard on native activity
But I am facing a lot of trouble using the same methodology for the numeric keyboard. Any help would be great..Thanks!

Answer 1

Could not find a way to do this directly, had to override the onCreateInputConnection method of View class, and then make a JNI call to a function using the overridden method.
public class NumbersView extends View {
public NumbersView(Context context) {
super(context);
}
#Override
public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
InputConnection inputConnection = super.onCreateInputConnection(outAttrs);
switch(SystemKeyboardType){
case InputType.TYPE_CLASS_PHONE:
outAttrs.inputType |= InputType.TYPE_CLASS_PHONE;
break;
case InputType.TYPE_CLASS_TEXT:
outAttrs.inputType |= InputType.TYPE_CLASS_TEXT;
break;
case InputType.TYPE_CLASS_NUMBER:
outAttrs.inputType |= InputType.TYPE_CLASS_NUMBER;
break;
case InputType.TYPE_CLASS_DATETIME:
outAttrs.inputType |= InputType.TYPE_CLASS_DATETIME;
break;
default:
outAttrs.inputType |= InputType.TYPE_CLASS_TEXT;
break;
}
return inputConnection;
}
}
**/
#Override
protected void onCreate(Bundle savedInstanceState) {
calculateDeviceDPI();
super.onCreate(savedInstanceState);
myView = new NumbersView(getApplicationContext());
addContentView(myView,new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
myView.setFocusable(true);
myView.setFocusableInTouchMode(true);
//myView.requestFocus();
mContext = this;
}
public void displaySystemKeyboard(String keyboardType){
if(keyboardType.equals("text")) {
SystemKeyboardType = InputType.TYPE_CLASS_TEXT;
}
else if(keyboardType.equals("phone")) {
SystemKeyboardType = InputType.TYPE_CLASS_PHONE;
}
else if(keyboardType.equals("number")) {
SystemKeyboardType = InputType.TYPE_CLASS_NUMBER;
}
else if(keyboardType.equals("datetime")) {
SystemKeyboardType = InputType.TYPE_CLASS_DATETIME;
}
else {
SystemKeyboardType = InputType.TYPE_CLASS_DATETIME;
}
Context ctx = getApplicationContext();
InputMethodManager mgr = (InputMethodManager) ctx.getSystemService(Context.INPUT_METHOD_SERVICE);
myView.requestFocus();
// only will trigger it if no physical keyboard is open
mgr.restartInput(myView);
mgr.showSoftInput(myView, 0);
}
public void hideSystemKeyboard(){
Context ctx = getApplicationContext();
View myView = this.getWindow().getDecorView();
InputMethodManager mgr = (InputMethodManager) ctx.getSystemService(Context.INPUT_METHOD_SERVICE);
mgr.hideSoftInputFromWindow(myView.getWindowToken(), 0);
}
And finally made a JNI call to the function:
if(pShow){
jmethodID showSysKeys = lJNIEnv->GetMethodID(lClassDeviceAPI,"displaySystemKeyboard","(Ljava/lang/String;)V");
if(showSysKeys == NULL){
LOGI("displaySystemKeyboard::Couldn't get void displaySystemKeyboard Method");
return;
}
jstring keyboardType = lJNIEnv->NewStringUTF(KeyboardType.c_str());
if(!keyboardType)
{
LOGI( "failed to alloc param string in java." );
return;
};
lJNIEnv->CallVoidMethod(lObjDeviceAPI,showSysKeys, keyboardType);
}
else{
jmethodID hideSysKeys = lJNIEnv->GetMethodID(lClassDeviceAPI,"hideSystemKeyboard","()V");
if(hideSysKeys == NULL){
LOGI("hideSystemKeyboard::Couldn't get void hideSystemKeyboard Method");
return;
}
lJNIEnv->CallVoidMethod(lObjDeviceAPI,hideSysKeys);
}
lJavaVM->DetachCurrentThread();