Esiste un metodo per modificare il layout di una snackBar in una visualizzazione personalizzata?

Ora diventa nero e possiamo cambiare il colore di sfondo. Ma non conosco il modo giusto per gonfiare un nuovo layout e renderlo come sfondo di snackBars?

Grazie...

Lo Snackbar non consente di impostare un layout personalizzato. Tuttavia, come suggerito da Primoz990, puoi ottenere la vista dello Snackbar. La funzione getView restituisce Snackbar.SnackbarLayout, che è un oggetto LinearLayout orizzontale i cui figli sono TextView e Button. Per aggiungere la tua vista alla Snackbar, devi solo nascondere la TextView e aggiungere la tua Vista alla Snackbar.SnackbarLayout.

// Create the Snackbar
Snackbar snackbar = Snackbar.make(containerLayout, "", Snackbar.LENGTH_LONG);
// Get the Snackbar's layout view
Snackbar.SnackbarLayout layout = (Snackbar.SnackbarLayout) snackbar.getView();
// Hide the text
TextView textView = (TextView) layout.findViewById(android.support.design.R.id.snackbar_text);
textView.setVisibility(View.INVISIBLE);

// Inflate our custom view
View snackView = mInflater.inflate(R.layout.my_snackbar, null);
// Configure the view
ImageView imageView = (ImageView) snackView.findViewById(R.id.image);
imageView.setImageBitmap(image);
TextView textViewTop = (TextView) snackView.findViewById(R.id.text);
textViewTop.setText(text);
textViewTop.setTextColor(Color.WHITE);

//If the view is not covering the whole snackbar layout, add this line
layout.setPadding(0,0,0,0);

// Add the view to the Snackbar's layout
layout.addView(snackView, 0);
// Show the Snackbar
snackbar.show();

È possibile a partire dalla revisione 25.1.0 della libreria di supporto Android

I. Dichiarare il layout personalizzato nella cartella dei valori / layout.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="horizontal"
          android:layout_width="match_parent"
          android:layout_height="wrap_content">

<Button
    android:id="@+id/snackbar_action"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="@dimen/design_snackbar_extra_spacing_horizontal"              
    android:layout_marginStart="@dimen/design_snackbar_extra_spacing_horizontal"
    android:layout_gravity="center_vertical|right|end"
    android:paddingTop="@dimen/design_snackbar_padding_vertical"
    android:paddingBottom="@dimen/design_snackbar_padding_vertical"
    android:paddingLeft="@dimen/design_snackbar_padding_horizontal"
    android:paddingRight="@dimen/design_snackbar_padding_horizontal"
    android:visibility="gone"
    android:textColor="?attr/colorAccent"
    style="?attr/borderlessButtonStyle"/>

<TextView
    android:gravity="center_vertical|right"
    android:id="@+id/snackbar_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:paddingTop="@dimen/design_snackbar_padding_vertical"
    android:paddingBottom="@dimen/design_snackbar_padding_vertical"
    android:paddingLeft="@dimen/design_snackbar_padding_horizontal"
    android:paddingRight="@dimen/design_snackbar_padding_horizontal"
    android:textAppearance="@style/TextAppearance.Design.Snackbar.Message"
    android:maxLines="@integer/design_snackbar_text_max_lines"
    android:layout_gravity="center_vertical|left|start"
    android:ellipsize="end"/>

</LinearLayout>

Suggerimenti:

• Utilizzare i @dimen/design_snackbarvalori per abbinare le linee guida di progettazione dei materiali.
• Utilizzare ?attr/colorAccentper applicare le modifiche al tema dell'applicazione a Snackbar.

II. Estendi la classe BaseTransientBottomBar .

public class final CustomSnackbar extends BaseTransientBottomBar<CustomSnackbar> {

/**
 * Constructor for the transient bottom bar.
 *
 * @param parent The parent for this transient bottom bar.
 * @param content The content view for this transient bottom bar.
 * @param contentViewCallback The content view callback for this transient bottom bar.
 */
private CustomSnackbar(ViewGroup parent, View content,    
            ContentViewCallback contentViewCallback) {
    super(parent, content, contentViewCallback);
}
}

III. Aggiungi BaseTransientBottomBar.ContentViewCallback

public class final CustomSnackbar ...{

...

private static class ContentViewCallback implements        
                   BaseTransientBottomBar.ContentViewCallback {

  // view inflated from custom layout
  private View content;

  public ContentViewCallback(View content) {
      this.content = content;
  }

  @Override
  public void animateContentIn(int delay, int duration) {
      // add custom *in animations for your views
      // e.g. original snackbar uses alpha animation, from 0 to 1
      ViewCompat.setScaleY(content, 0f);
      ViewCompat.animate(content)
                .scaleY(1f).setDuration(duration)
                .setStartDelay(delay);
  }

  @Override
  public void animateContentOut(int delay, int duration) {
      // add custom *out animations for your views
      // e.g. original snackbar uses alpha animation, from 1 to 0
      ViewCompat.setScaleY(content, 1f);
      ViewCompat.animate(content)
                .scaleY(0f)
                .setDuration(duration)
                .setStartDelay(delay);
  }
}
}

IV. Aggiungi metodo per creare Snackbar con layout personalizzato e metodi per riempirlo.

public class final CustomSnackbar ...{

...

public static CustomSnackbar make(ViewGroup parent, @Duration int duration) {
 // inflate custom layout
 LayoutInflater inflater = LayoutInflater.from(parent.getContext());
 View content = inflater.inflate(R.layout.snackbar_view, parent, false);

 // create snackbar with custom view
 ContentViewCallback callback= new ContentViewCallback(content);
 CustomSnackbar customSnackbar = new CustomSnackbar(parent, content, callback);
// Remove black background padding on left and right
customSnackbar.getView().setPadding(0, 0, 0, 0);


 // set snackbar duration
 customSnackbar.setDuration(duration);
 return customSnackbar;
 }

 // set text in custom layout
 public CustomSnackbar setText(CharSequence text) {
 TextView textView = (TextView) getView().findViewById(R.id.snackbar_text);
 textView.setText(text);
 return this;
 }

 // set action in custom layout
 public CustomSnackbar setAction(CharSequence text, final OnClickListener  listener) {
 Button actionView = (Button) getView().findViewById(R.id.snackbar_action);
 actionView.setText(text);
 actionView.setVisibility(View.VISIBLE);
 actionView.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View view) {
         listener.onClick(view);
         // Now dismiss the Snackbar
         dismiss();
     }
 });
 return this;
}
}

V. Crea istanza di CustomSnackbare chiama il show()metodo.

CustomSnackbar customSnackbar = CustomSnackbar.make(rooView,      CustomSnackbar.LENGTH_INDEFINITE);
customSnackbar.setText("No network connection!");
customSnackbar.setAction("Retry", new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // handle click here
    }
});
customSnackbar.show();

Scopri di più su Snackbar e la sua personalizzazione su materialdoc.com

CustomSnackbar.classCodice completo :

import android.support.annotation.NonNull;
import android.support.design.widget.BaseTransientBottomBar;
import android.support.v4.view.ViewCompat;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;


public class CustomSnackbar extends BaseTransientBottomBar<CustomSnackbar> {

    /**
     * Constructor for the transient bottom bar.
     *
     * @param parent The parent for this transient bottom bar.
     * @param content The content view for this transient bottom bar.
     * @param callback The content view callback for this transient bottom bar.
     */
    private CustomSnackbar(ViewGroup parent, View content, ContentViewCallback callback) {
        super(parent, content, callback);
    }

    public static CustomSnackbar make(@NonNull ViewGroup parent, @Duration int duration) {
        final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        final View content = inflater.inflate(R.layout.snackbar_view, parent, false);
        final ContentViewCallback viewCallback = new ContentViewCallback(content);
        final CustomSnackbar customSnackbar = new CustomSnackbar(parent, content, viewCallback);

        customSnackbar.getView().setPadding(0, 0, 0, 0);
        customSnackbar.setDuration(duration);
        return customSnackbar;
    }

    public CustomSnackbar setText(CharSequence text) {
        TextView textView = (TextView) getView().findViewById(R.id.snackbar_text);
        textView.setText(text);
        return this;
    }

    public CustomSnackbar setAction(CharSequence text, final View.OnClickListener listener) {
        Button actionView = (Button) getView().findViewById(R.id.snackbar_action);
        actionView.setText(text);
        actionView.setVisibility(View.VISIBLE);
        actionView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                listener.onClick(view);
                // Now dismiss the Snackbar
                dismiss();
            }
        });
        return this;
    }

    private static class ContentViewCallback implements BaseTransientBottomBar.ContentViewCallback {

        private View content;

        public ContentViewCallback(View content) {
            this.content = content;
        }

        @Override
        public void animateContentIn(int delay, int duration) {
            ViewCompat.setScaleY(content, 0f);
            ViewCompat.animate(content).scaleY(1f).setDuration(duration).setStartDelay(delay);
        }

        @Override
        public void animateContentOut(int delay, int duration) {
            ViewCompat.setScaleY(content, 1f);
            ViewCompat.animate(content).scaleY(0f).setDuration(duration).setStartDelay(delay);
        }
    }
}

Il modo XML:

Il file xml di layout originale utilizzato per Snackbarè questo file:

design_layout_snackbar_include.xml:

<?xml version="1.0" encoding="utf-8"?>        
<merge xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView
            android:id="@+id/snackbar_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
              ...
            android:ellipsize="end"/>

    <Button
            android:id="@+id/snackbar_action"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="gone"
              ...
            android:textColor="?attr/colorAccent"
            style="?attr/borderlessButtonStyle"/>

</merge>

Quindi, per sovrascrivere questo layout dovresti scrivere il tuo layout con lo stesso android:ids di questo e nel tuo refs.xmlfile dovresti aggiungere questa riga:

<resources xmlns:tools="http://schemas.android.com/tools">
   ....   
    <item name="design_layout_snackbar_include" tools:override="true" type="layout">
        @layout/my_layout_snackbar
    </item>
   ....
</resources>

La risposta è: non personalizzare lo Snackbar. Non dovrebbe contenere più elementi di un breve testo e un'azione. Consulta le linee guida per la progettazione dei materiali di Google .

AGGIORNAMENTO: Se vuoi comunque personalizzare lo Snackbar ecco cosa ho implementato nella mia app:

//generate the snackbar
Snackbar sb = Snackbar.make(rootView, snack.text, duration);
//set te action button text color
sb.setActionTextColor(mCurrentActivity.getResources().getColor(R.color.snack_text_action));
//Get the view of the snackbar
View sbView = sb.getView();
//set background color
sbView.setBackgroundColor(mCurrentActivity.getResources().getColor(backgroudResId));
//Get the textview of the snackbar text
TextView textView = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_text);
//set text color
textView.setTextColor(mCurrentActivity.getResources().getColor(R.color.snack_text));
//increase max lines of text in snackbar. default is 2.
textView.setMaxLines(10);

Non ho mai provato, ma con la visualizzazione della radice della Snackbar, è possibile aggiungere a livello di codice nuove visualizzazioni alla Snackbar.

private Snackbar showSnackbar(CoordinatorLayout coordinatorLayout, int duration) { // Create the Snackbar
    Snackbar snackbar = Snackbar.make(coordinatorLayout, "", duration);
    // 15 is margin from all the sides for snackbar
    int marginFromSides = 15;

    float height = 100;

    //inflate view
    View snackView = getLayoutInflater().inflate(R.layout.snackbar_layout, null);

    // White background
    snackbar.getView().setBackgroundColor(Color.WHITE);
    // for rounded edges
    snackbar.getView().setBackground(getResources().getDrawable(R.drawable.round_edges));

    Snackbar.SnackbarLayout snackBarView = (Snackbar.SnackbarLayout) snackbar.getView();
    FrameLayout.LayoutParams parentParams = (FrameLayout.LayoutParams) snackBarView.getLayoutParams();
    parentParams.setMargins(marginFromSides, 0, marginFromSides, marginFromSides);
    parentParams.height = (int) height;
    parentParams.width = FrameLayout.LayoutParams.MATCH_PARENT;
    snackBarView.setLayoutParams(parentParams);

    snackBarView.addView(snackView, 0);
    return snackbar;
}

In onCreate dell'attività:

CoordinatorLayout coordinatorLayout = findViewById(R.id.coordinator_layout);

final Snackbar snackbar = showSnackbar(coordinatorLayout, Snackbar.LENGTH_LONG);
            snackbar.show();
            View view = snackbar.getView();
            TextView tv = (TextView) view.findViewById(R.id.snackbar_action);
            tv.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    snackbar.dismiss();
                }
            });

Ho provato e funziona!

View custom = LayoutInflater.from(this).inflate(R.layout.custom_view, null);
snackbar.getView().setPadding(0,0,0,0);
((ViewGroup) snackbar.getView()).removeAllViews();
((ViewGroup) snackbar.getView()).addView(custom);
TextView textView = custom.findViewById(R.id.text);
View button = custom.findViewById(R.id.button);
textView.setText("Your text here");
button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
       // do something
    }
});

Prova il codice seguente.

Snackbar snackbar = Snackbar.make(container, "No Internet Connection", Snackbar.LENGTH_LONG);
View sbView = snackbar.getView();
sbView.setBackgroundColor(ContextCompat.getColor(this, R.color.colorPrimary));
snackbar.show();

Nota:

container - vista genitore del layout.

Per aggiungere alla risposta di Yakiv Mospan, per rendere il tuo BaseTransientBottomBarspettacolo personalizzato dal basso come un Snackbar, copia questo metodo dalla Snackbarclasse per trovare un genitore adatto per il BaseTransientBottomBarcostruttore.

private static ViewGroup findSuitableParent(View view) {
    ViewGroup fallback = null;
    do {
        if (view instanceof CoordinatorLayout) {
            // We've found a CoordinatorLayout, use it
            return (ViewGroup) view;
        } else if (view instanceof FrameLayout) {
            if (view.getId() == android.R.id.content) {
                // If we've hit the decor content view, then we didn't find a CoL in the
                // hierarchy, so use it.
                return (ViewGroup) view;
            } else {
                // It's not the content view but we'll use it as our fallback
                fallback = (ViewGroup) view;
            }
        }

        if (view != null) {
            // Else, we will loop and crawl up the view hierarchy and try to find a parent
            final ViewParent parent = view.getParent();
            view = parent instanceof View ? (View) parent : null;
        }
    } while (view != null);

    // If we reach here then we didn't find a CoL or a suitable content view so we'll fallback
    return fallback;
}

Versione Kotlin per la risposta accettata: https://stackoverflow.com/a/33441214/2437655

 private fun showSnackbar() {
        val snackbar = Snackbar.make(
                binding.root,
                "",
                Snackbar.LENGTH_INDEFINITE
        )
        (snackbar.view as Snackbar.SnackbarLayout).apply {
            findViewById<View>(R.id.snackbar_text).visibility = View.INVISIBLE
            findViewById<View>(R.id.snackbar_action).visibility = View.INVISIBLE
            val snackbarBinding = DataBindingUtil.inflate<SnackbarBinding>(
                    LayoutInflater.from(this@SnackbarActivity),
                    R.layout.snackbar,
                    binding.root as ViewGroup,
                    false
            )
            setPadding(0, 0, 0, 0)
            addView(snackbarBinding.root, 0)
        }
        snackbar.setDuration(8000).show()
    }

Ecco il mio codice di classe util per kotlin: https://gist.github.com/Ryszardenko/db429bc7d177e646ffe27e0672a0958c#file-customsnackbar-kt

class CustomSnackbar(private val view: View) {

    fun showSnackBar(title: String, cancelFun: () -> Unit = {}) {
        val snackView = View.inflate(view.context, R.layout.snackbar, null)
        val binding = SnackbarBinding.bind(snackView)
        val snackbar = Snackbar.make(view, "", Snackbar.LENGTH_LONG)
        (snackbar.view as ViewGroup).removeAllViews()
        (snackbar.view as ViewGroup).addView(binding.root)
        snackbar.view.setPadding(0, 0, 0, 0)
        snackbar.view.elevation = 0f
        snackbar.setBackgroundTint(
            ContextCompat.getColor(
                view.context,
                android.R.color.transparent
            )
        )
        binding.tvTitle.text = title
        binding.btnCancel.setOnClickListener {
            cancelFun()
            snackbar.dismiss()
        }
        snackbar.show()
    }
}

cancelFun () è un lambda, di default vuoto - puoi passare lì per esempio la funzione "undo".

Puoi provare questa libreria. Questo è un wrapper per la snackbar predefinita di Android. https://github.com/ChathuraHettiarachchi/CSnackBar

Snackbar.with(this,null)
    .type(Type.SUCCESS)
    .message("Profile updated successfully!")
    .duration(Duration.SHORT)
    .show();

oppure puoi persino utilizzare la tua visualizzazione

View view = getLayoutInflater().inflate(R.layout.custom_view, null);

Snackbar.with(this,null)
        .type(Type.UPDATE)
        .contentView(view, 76)
        .duration(Duration.SHORT)
        .show();

Attualmente l'unico problema con il layout personalizzato è che dobbiamo passare l'altezza della vista in dp come input