I am trying out the new Android Data Binding library (1.0-rc1) and I have made a User object with three String fields (name, email, and age) and linked them to 3 EditTexts in my layout.
On the first field (name) I placed a TextWatcher. Everything seems to work well. I prevented the notifyPropertyChanged loop in the name field by checking to see if the text is different before allowing it to call setName.
The problem is, every time I type in the name field, the cursor resets to the left of the EditText after each character. I googled around for a solution but most fix suggestions for a cursor issue say to grab a reference to the EditText and adjust the cursor position manually. But I'd like to avoid doing that since I then need to findViewByID to the EditText and the point of Data Binding was to try to avoid doing that. Thank you for your help.
My layout looks like this:
<layout>
<data>
<variable name="user" type="com.carlpoole.databindingstest.User"/>
</data>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:bind="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/name"
android:text="@{user.name}"
bind:addTextChangedListener="@{user.nameChanged}"
/>
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/email"
android:layout_below="@+id/name"
android:text="@{user.email}"/>
<EditText
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/age"
android:layout_below="@+id/email"
android:text="@{user.age}"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/age"
android:text="@{user.name}"/>
</RelativeLayout>
My user object looks like this:
import android.databinding.BaseObservable;
import android.databinding.Bindable;
import android.text.Editable;
import android.text.TextWatcher;
public class User extends BaseObservable {
private String name;
private String email;
private String age;
public User(String name, String email, String age) {
this.name = name;
this.email = email;
this.age = age;
}
public User(){};
@Bindable
public String getName() {
return name;
}
@Bindable
public String getEmail() {
return email;
}
@Bindable
public String getAge() {
return age;
}
public final TextWatcher nameChanged = new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
if(!s.toString().equalsIgnoreCase(name))
setName(s.toString());
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {}
};
public void setName(String name) {
this.name = name;
notifyPropertyChanged(com.carlpoole.databindingstest.BR.name);
}
public void setEmail(String email) {
this.email = email;
}
public void setAge(String age) {
this.age = age;
}
}
My activity looks like this
import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import com.carlpoole.databindingstest.databinding.ActivityMainBinding;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
User user = new User("Carl Poole", "[email protected]", "26");
binding.setUser(user);
}
}
TextWatcherin the first place? – Osteomalacia