No FindViewById

This post is going to save lot of your time from using the FindViewById. So  I found this interesting article on Medium.com  No more findviewById written by  George Mount.  and I thought why don't I write how it can be done in sample program . That would be much easier to understand isn't . So here it is.

And please read the article first from Medium.com first .

In this post I will demonstrate you , how to use dataBinding option in Android Studio, which will will eliminate the painful part of binding every view in xml with your Java.  Your Android Studio must be version 1.5 and Higher.


1. Add the Following lines to your app Build.gradle file :

android{
   dataBinding.enabled = true;
}

After adding this line to your app gradle file, the file should look something like this.

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.0"
    dataBinding.enabled = true;

    defaultConfig {
        applicationId "com.hourglass.lingaraj.nofindviewbyid"
        minSdkVersion 9
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.0.0'
    compile 'com.android.support:recyclerview-v7:24.0.0'
}

2. activity_main.xml:

This will have two button and one text view layout. On pressing the first , will display a toast message of text which is shown in the textview. The second button is an example for using Databinding with Recyclerview. So that will take you different activity , in which the recyclerview will display list of names. 

<layout  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" >
    <RelativeLayout
    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="com.hourglass.lingaraj.nofindviewbyid.MainActivity">

   <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_alignParentStart="true"
       android:layout_centerHorizontal="true"
       android:textSize="18sp"
       android:id="@+id/hello_textview"
       android:text="example no findview by id"
       android:layout_alignParentLeft="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Display Toast"
        android:id="@+id/display_toast"
        android:layout_below="@+id/hello_textview"
        android:layout_centerHorizontal="true"
        />


        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Binding Example Recyclerview"
            android:id="@+id/recylerview_click"
             android:layout_below="@+id/display_toast"
            android:layout_centerHorizontal="true"
            />


    </RelativeLayout>

</layout>

4.  MainActivity.java:

public class MainActivity extends AppCompatActivity {

    ActivityMainBinding activityMainBinding;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        activityMainBinding = DataBindingUtil.setContentView(this,R.layout.activity_main);

        activityMainBinding.displayToast.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getApplicationContext(),activityMainBinding.helloTextview.getText().toString(),Toast.LENGTH_SHORT).show();

            }
        });

        activityMainBinding.recylerviewClick.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(),ActivityRecylerExample.class);
                startActivity(intent);
            }
        });


    }
}

5. DisplayNameListAdapter:
Code showing how to Databinding with Recyclerview.

public class DisplayNameListAdapter extends RecyclerView.Adapter<DisplayNameListAdapter.ViewHolder> {

     private String TAG = "Recycler Adapter";
    private Context mContext;
    private String[]  names = {"John","Leo","Luke","mark"};


    public DisplayNameListAdapter(Context context) {
        this.mContext = context;
    }


    public static class ViewHolder extends RecyclerView.ViewHolder {

        RecyclerviewlayoutsampleBinding binding;

        public ViewHolder(Context context,View view) {
            super(view);
          binding = DataBindingUtil.bind(view);
        }

        public RecyclerviewlayoutsampleBinding getBinding()
        {
            return binding;
        }

    }

    @Override
    public DisplayNameListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {


        View view = LayoutInflater.from(this.mContext).inflate(R.layout.recyclerviewlayoutsample, parent, false);

        ViewHolder viewHolder = new ViewHolder(this.mContext,view);
        return viewHolder;

    }

    @Override
    public void onBindViewHolder(DisplayNameListAdapter.ViewHolder holder, int position) {
       // holder.getBinding().name.setText(this.names[position]);

        holder.getBinding().name.setText(this.names[position]);
        holder.getBinding().executePendingBindings();
        Log.d(TAG,this.names[position]);
    }

    @Override
    public int getItemCount() {
        return this.names.length;
    }

}

you can download the full working code from here