Android - Can I Databinding programatically? - without layout XML

问题

Below is XML equivalent of what I'm trying to achieve, but without XML

<Button
    android:id="@+id/bt_start"
    android:onClick="@{() -> vm.onClickedStart()}"
    android:text='@{vm.btStartLbl}' />

so if I have:

ConstraintLayout cl = findViewById(R.id.cl);
Button btn = new Button(MyActivity.this);

btn.setText("How to Data Bind here?");

btn.setOnClickListener(new OnClickListener (){ /* how to databind here? */ });

cl.addView(btn);

how to databind it as equivalent as xml above? is it possible?

回答1:

For automatic setting data, you could use ObservableField

Simplified version for auto-updating btn:

ObservableField<String> title = new ObservableField<>();

Observable.OnPropertyChangedCallback propertyChangeCallback = new Observable.OnPropertyChangedCallback() {
    @Override
    public void onPropertyChanged(Observable sender, int property) {
        btn.setText(title.get());
        // here what you want to automatically update
    }
};


public void onStart() {
    // activity/fragment lifecycle method
    title.addOnPropertyChangedCallback(propertyChangeCallback);
}


public void onStop() {
    // activity/fragment lifecycle method
    title.removeOnPropertyChangedCallback(propertyChangeCallback);
}

And then whenever you call title.set("some value");, it will be automatically trigger the update.

来源：https://stackoverflow.com/questions/48386329/android-can-i-databinding-programatically-without-layout-xml