@FindView allows you to bind UI-components from the layouts into your fragments and activities. You don’t have to use findViewById() anymore, cast View to the actual class, pass the IDs from R file. Androjeta does it all for you.
Let’s go through this feature with an example. Assume we have a layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/sampleActivity_textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
To bind the TextView into our Activity as simple as:
class SampleActivity extends BaseActivity {
@FindView
TextView textView;
}
How does it work? Well, by default Androjeta composes the ID as:
<lowercased activity name> + "_" + <field name>
So, in our example it’s: “sampleActivity_textView”.
Note You shouldn’t distrust this approach. In case of misspelling, it get compile-time error. Also, it encourages you to keep your code clean and in one style.
Here’s the BaseActivity:
class BaseActivity extends Activity {
@Override
public void setContentView(int layoutResID) {
super.setContentView(layoutResID);
MetaHelper.findViews(this);
}
}
For sure, you can pass whatever R.id you want:
class SampleActivity extends BaseActivity {
@FindView(R.id.sampleActivity_textView)
TextView textView;
}
or, what is important for library modules (aar files), you can pass only ID as a string:
class SampleActivity extends BaseActivity {
@FindView(name = "sampleActivity_textView")
TextView textView;
}
You can use FindView not just inside an activity, but any object. Pass the View instance in which you want to find the views as parameter:
public static class ViewHolder extends RecyclerView.ViewHolder {
@FindView
protected CardView cardView;
@FindView
protected TextView titleTextView;
@FindView
protected Button okButton;
public ViewHolder(View view) {
super(view);
MetaHelper.findViews(this, view);
}
}
public static void findViews(Activity activity) {
new FindViewController(metasitory, activity).findViews();
}
public static void findViews(Object master, View view) {
new FindViewController(metasitory, master).findViews(view);
}
Please, read the article about MetaHelper if you haven’t yet.
