Detail

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="10dp"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="View Data : "
        android:textAppearance="@style/TextAppearance.AppCompat.Title" />

    <TextView
        android:id="@+id/tv_nama_barang"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:ems="10"
        android:hint="Barang"
        android:inputType="text" />

    <TextView
        android:id="@+id/tv_merk_barang"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:ems="10"
        android:hint="Merk"
        android:inputType="text" />

    <TextView
        android:id="@+id/tv_harga_barang"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:ems="10"
        android:hint="Harga"
        android:inputType="number" />

    <Button
        android:id="@+id/bt_ok"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:text="OK" />
</LinearLayout>

public class DetailActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detail);

        TextView tvNama = (TextView) findViewById(R.id.tv_nama_barang);
        TextView tvMerk = (TextView) findViewById(R.id.tv_merk_barang);
        TextView tvHarga = (TextView) findViewById(R.id.tv_harga_barang);

        System.out.println("APPINVENT " + getIntent().getExtras().getString("nama"));
        tvNama.setText("Barang " + getIntent().getExtras().getString("nama"));
        tvMerk.setText("Merk " + getIntent().getExtras().getString("merk"));
        tvHarga.setText("Harga " + getIntent().getExtras().getString("harga"));

        Button buttonOK = (Button) findViewById(R.id.bt_ok);
        buttonOK.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }
}