按钮返回collapsingToolbar - Android

-2

它发生在我的主要活动中，我调用了一个活动，我称之为collapsingToolbar的故事，以及一切工作正常只有我不能给回，因为collapsinToolbar不生成按钮背部。主要活动的按钮返回collapsingToolbar - Android

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) { 
} 
}

，我产生了collapsingToolbar我的主要活动

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 "); 


} 
}

XML代码活动的Java代码

在这里我产生collapsingToolbar活动的3210

XML代码

<?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>

来源

2016-11-20 Jorge1023

您应该能够使用setDisplayHomeAsUpEnabled显示默认的后退按钮：

final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
setSupportActionBar(toolbar); 
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

来源

2016-11-21 00:16:52 tachyonflux

有了这三行，在打开collapsintoolbar活动时，应用程序关闭 – Jorge1023

您可以使用app:navigationIcon属性在工具栏组件的xml中添加后退导航图标。

<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" />

来源

2017-12-08 13:19:59

按钮返回collapsingToolbar - Android

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