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Android Animations and Transitions The Transitions Framework Common Pitfalls

Posted by sai maddukuri
sai maddukuri
9,108 Points

i cant understand why we included ButterKnife.bind(AlbumDetailActivity.this);

you used ButterKnife api but i can't understand the purpose of ButterKnife.bind(AlbumDetailActivity.this); can any one help? i can't understand !!!! or can any one tell the replacement code for ButterKnife.bind(AlbumDetailActivity.this); i mean without api!!!!

1 Answer

Lauren Moineau
Lauren Moineau
9,483 Points
Lauren Moineau
Lauren Moineau
9,483 Points

Hi Sai. Butterknife.bind() is called to bind the data to the views of the activity passed into the method (in your example, AlbumDetailActivity.java). It replaces the usual findViewbyId() calls, making the code more concise as you only need one call.

Without the Butterknife library, your code would be:

public class AlbumDetailActivity extends AppCompatActivity {
    ImageView albumArtView;
    ImageButton fab;
    ViewGroup titlePanel;
    ViewGroup trackPanel;
    ViewGroup detailContainer;

    // (...)

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_album_detail);

        albumArtView = findViewById(R.id.album_art);
        fab = findViewById(R.id.fab);
        titlePanel = findViewById(R.id.title_panel);
        trackPanel= findViewById(R.id.track_panel);
        detailContaine= findViewById(R.id.detail_container);
       // (...)
    }
}

With the Butterknife library:

public class AlbumDetailActivity extends AppCompatActivity {
    @BindView(R.id.album_art) ImageView albumArtView;
    @BindView(R.id.fab) ImageButton fab;
    @BindView(R.id.title_panel) ViewGroup titlePanel;
    @BindView(R.id.track_panel) ViewGroup trackPanel;
    @BindView(R.id.detail_container) ViewGroup detailContainer;

    // (...)

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_album_detail);

        ButterKnife.bind(this);
       // (...)
    }
}

Hope that helps :)

Ryan Dsouza
Ryan Dsouza
9,388 Points
Ryan Dsouza
Ryan Dsouza
9,388 Points

It so does. Thanks a tonne

Lauren Moineau
Lauren Moineau
9,483 Points

You're welcome! Glad I could help :)