I'm following the tutorial (Android Studio 2.3 Development Essentials) but giving this error
Can not solve symbol
in this part of the code
ConstraintLayout myLayout =
(ConstraintLayout)findViewById(R.id.activity_motion_event);
this is the action_motion_event.xml file-
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="aprendendo.com.motionevent.MotionEventActivity">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="@string/touch_one_status"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:text="@string/touch_two_status"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView1" />
</android.support.constraint.ConstraintLayout>
this is the MotionEventActivity code
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_motion_event);
ConstraintLayout myLayout =
(ConstraintLayout)findViewById(R.id.activity_motion_event);
myLayout.setOnTouchListener(
new ConstraintLayout.OnTouchListener(){
public boolean onTouch(View v,
MotionEvent m){
handleTouch(m);
return true;
}
}
);
}
void handleTouch(MotionEvent m){
TextView textView1 = (TextView)findViewById(R.id.textView1);
TextView textView2 = (TextView)findViewById(R.id.textView2);
int pointerCount = m.getPointerCount();
for (int i = 0; i < pointerCount; i++){
int x = (int) m.getX(i);
int y = (int) m.getY(i);
int id = m.getPointerId(i);
int action = m.getActionMasked();
int actionIndex = m.getActionIndex();
String actionString;
switch (action){
case MotionEvent.ACTION_DOWN:
actionString = "DOWN";
break;
case MotionEvent.ACTION_UP:
actionString = "UP";
break;
case MotionEvent.ACTION_POINTER_DOWN:
actionString = "PNTR DOWN";
break;
case MotionEvent.ACTION_POINTER_UP:
actionString = "PNTR UP";
break;
case MotionEvent.ACTION_MOVE:
actionString = "MOVE";
break;
default:
actionString = "";
}
String touchStatus = "Action: " + actionString + " Index: " +
actionIndex + " ID: " + id + " X: " + x + " Y: " + y;
if (id == 0)
textView1.setText(touchStatus);
else
textView2.setText(touchStatus);
}
}
}