按钮返回到collapsingToolbar - Android

Question

从我的主要活动开始，我在该活动中调用了一个活动，我称之为使用collapsingToolbar的故事，一切正常，但我无法返回，因为collapsinToolbar不会生成按钮。

主要活动的Java代码

package com.herprogramacion.alquileres;

import android.database.Cursor;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import com.herprogramacion.alquileres.provider.Contrato.Alquileres;

public class ActividadListaAlquileres extends AppCompatActivity implements       AdaptadorAlquileres.OnItemClickListener, LoaderManager.LoaderCallbacks<Cursor> {

private RecyclerView listaUI;
private LinearLayoutManager linearLayoutManager;
private AdaptadorAlquileres adaptador;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.actividad_lista_alquileres);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Filtro...", Snackbar.LENGTH_LONG)
                    .setAction("Acción", null).show();
        }
    });

    // Preparar lista


    listaUI = (RecyclerView) findViewById(R.id.lista);


    listaUI.setHasFixedSize(true);

    linearLayoutManager = new LinearLayoutManager(this);


    listaUI.setLayoutManager(linearLayoutManager);


    adaptador = new AdaptadorAlquileres(this, this);


    listaUI.setAdapter(adaptador);


    // Iniciar loader
   getSupportLoaderManager().restartLoader(1, null, this);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_actividad_lista_alquileres, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@Override
public void onClick(AdaptadorAlquileres.ViewHolder holder, String idAlquiler) {
   // Snackbar.make(findViewById(android.R.id.content), ":id = " + idAlquiler,
     //       Snackbar.LENGTH_LONG).show();
}


@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    return new CursorLoader(this, Alquileres.URI_CONTENIDO, null, null, null, null);
}

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
    if (adaptador != null) {
        adaptador.swapCursor(data);
    }
}

@Override
public void onLoaderReset(Loader<Cursor> loader) {
}
}

我生成collapsingToolbar的活动的Java代码

package com.herprogramacion.alquileres;

import android.content.Intent;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;

public class biografia2 extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_biografia2);

    CollapsingToolbarLayout collapsingToolbar =
            (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
    collapsingToolbar.setTitle("Titulo ");


}
}

我的主要活动的Xml代码

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<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.herprogramacion.alquileres.ActividadListaAlquileres">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/contenido_actividad_lista_alquileres" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/icono_filtro" />

</android.support.design.widget.CoordinatorLayout>

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我生成collapsingToolbar的活动的Xml代码

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<?xml version="1.0" encoding="utf-8"?>


<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="@dimen/detail_backdrop_height"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:fitsSystemWindows="true">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginStart="48dp"
            app:expandedTitleMarginEnd="64dp" >

            <ImageView
                android:id="@+id/backdrop"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="centerCrop"
                android:fitsSystemWindows="true"
                app:layout_collapseMode="parallax"
                android:src="@drawable/jack"
                android:alpha="0.5"/>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="170dp"
                android:layout_gravity="center">

            </RelativeLayout>


            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                app:layout_collapseMode="pin" />

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:paddingTop="24dp">

            <android.support.v7.widget.CardView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/card_margin">

                <LinearLayout
                    style="@style/Widget.CardContent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

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

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:text="@string/lorem_ipsum" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="@dimen/card_margin"
                android:layout_marginLeft="@dimen/card_margin"
                android:layout_marginRight="@dimen/card_margin">

                <LinearLayout
                    style="@style/Widget.CardContent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

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

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:text="@string/lorem_ipsum" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="@dimen/card_margin"
                android:layout_marginLeft="@dimen/card_margin"
                android:layout_marginRight="@dimen/card_margin">

                <LinearLayout
                    style="@style/Widget.CardContent"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

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

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:text="@string/lorem_ipsum" />

                </LinearLayout>

            </android.support.v7.widget.CardView>

        </LinearLayout>

    </android.support.v4.widget.NestedScrollView>

    <android.support.design.widget.FloatingActionButton
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        app:layout_anchor="@id/appbar"
        app:layout_anchorGravity="bottom|right|end"
        android:src="@drawable/ic_discuss"
        android:layout_margin="@dimen/fab_margin"
        android:clickable="true"/>

</android.support.design.widget.CoordinatorLayout>

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Answer 1

您可以使用app:navigationIcon属性在工具栏组件的xml中添加返回导航图标。

<android.support.v7.widget.Toolbar
    android:id="@+id/materialup.toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:minHeight="?attr/actionBarSize"
    app:layout_scrollFlags="scroll"
    app:navigationIcon="?homeAsUpIndicator" />

Answer 2

您应该可以使用final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); 显示默认后退按钮：

<table style="border: 1x solid black;">
  <tr>
    <th>Id</th>
    <th>Name</th>
    <th>Items</th>
  </tr>

  <tr>
    <td>1</td>
    <td>A</td>
    <td>
      <ul>
        <li>item 1</li>
        <li>item2</li>
        <li>item 3</li>
      </ul> 
    </td>
  </tr>
    <tr>
    <td>2</td>
    <td>B</td>
    <td>
      <ul>
        <li>item 1</li>
        <li>item2</li> 
      </ul> 
    </td>
  </tr>
</table>