Symbole in android.support.v7.widget.Toolbar mit Zurück-Taste

Question

Ich habe eine Symbolleiste mit einem Zurück-Button. Ich versuche, einen Anhang Knopf in der Werkzeugleiste zu setzen, indem ich toolbar_menu.xml aufblase, aber es wird nicht angezeigt. Ich habe meinen Code unten angehängt.

Die Aktivität, die Symbolleiste hat:

activity_set_database.xml

 <?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     xmlns:app="http://schemas.android.com/apk/res-auto" 
     xmlns:card_view="http://schemas.android.com/tools" 
     android:background="#383838" 
     android:fitsSystemWindows="true" 
     android:layout_height="match_parent"> 


     <android.support.design.widget.AppBarLayout 
      android:layout_width="match_parent" 
      android:id="@+id/appBarLayout" 
      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="#383838" 
       app:popupTheme="@style/AppTheme.PopupOverlay" > 

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

     </android.support.design.widget.AppBarLayout> 
     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_above="@+id/message" 
      android:layout_marginBottom="4dp" 
      android:orientation="vertical" 
      android:weightSum="1" 
      android:layout_below="@+id/appBarLayout"> 

      <android.support.v7.widget.RecyclerView 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:id="@+id/recyclerView" 
       android:background="#ffffff" 
       android:layout_above="@+id/buttonSendMessage" 
       android:layout_weight="0.84" /> 
     </LinearLayout> 

     <LinearLayout 
      android:id="@+id/message" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="horizontal" 
      android:layout_alignParentBottom="true" 
      android:layout_marginLeft="6dp" 
      android:layout_marginBottom="4dp" 
      android:layout_weight="2"> 
     <android.support.v7.widget.CardView 
      android:id="@+id/card_view" 
      android:layout_gravity="center" 
      android:layout_width="wrap_content" 
      android:layout_height="50dp" 
      android:layout_marginBottom="4dp" 
      android:layout_weight="0.5" 
      card_view:cardCornerRadius="2dp"> 

      <LinearLayout 
       android:layout_width="fill_parent" 
       android:layout_height="fill_parent" 
       android:orientation="horizontal" 
       android:weightSum="1"> 

       <EditText 
        android:id="@+id/editTextMessage" 
        android:layout_width="wrap_content" 
        android:layout_height="match_parent" 
        android:layout_weight="0.96" /> 

       <ImageView 
        android:id="@+id/cameraAttachmentButton" 
        android:layout_width="40dp" 
        android:layout_height="wrap_content" 
        android:background="@mipmap/compact" 
        android:layout_marginLeft="10dp" 
        android:clickable="true" 
        android:layout_centerVertical="true" 
        android:layout_alignParentRight="true" 
        android:layout_alignParentEnd="true" /> 
      </LinearLayout> 
     </android.support.v7.widget.CardView> 

      <ImageView 
       android:id="@+id/buttonSendMessage" 
       android:layout_width="40dp" 
       android:layout_height="40dp" 
       android:textStyle="bold" 
       android:layout_marginLeft="10dp" 
       android:layout_marginRight="10dp" 
       android:layout_gravity="center_vertical" 
       android:textColor="#ffffff" 
       android:background="@mipmap/send_button" 
       android:text="Send" /> 

    </LinearLayout> 


    </RelativeLayout> 

SetDataBase.java

 package com.houssup.houssupchat; 
    import android.app.Activity; 
    import android.content.Intent; 
    import android.provider.Settings; 
    import android.support.v7.app.AppCompatActivity; 
    import android.os.Bundle; 
    import android.support.v7.widget.LinearLayoutManager; 
    import android.support.v7.widget.RecyclerView; 
    import android.support.v7.widget.Toolbar; 
    import android.util.Log; 
    import android.view.MenuItem; 
    import android.view.View; 
    import android.widget.Button; 
    import android.widget.EditText; 
    import android.widget.ImageView; 
    import android.widget.Toast; 

    import com.firebase.client.ChildEventListener; 
    import com.firebase.client.DataSnapshot; 
    import com.firebase.client.Firebase; 
    import com.firebase.client.FirebaseError; 

    import com.firebase.client.Firebase; 
    import com.firebase.client.ValueEventListener; 

    import org.json.JSONArray; 
    import org.json.JSONException; 
    import org.json.JSONObject; 

    import java.util.ArrayList; 
    import java.util.HashMap; 
    import java.util.Iterator; 
    import java.util.List; 
    import java.util.Map; 

    public class SetDatabase extends AppCompatActivity { 
     private static final String TAG = MainActivity.class.getName(); 
     private ImageView imageView; 
     private EditText metText; 
     private ImageView mbtSent; 
     private Firebase mFirebaseRef; 
     private List<Chat> mChats; 
     private RecyclerView mRecyclerView; 
     private ChatAdapter mAdapter; 
     private String mId; 

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

      Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
      toolbar.inflateMenu(R.menu.toolbar_menu); 
      setSupportActionBar(toolbar); 

      toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() { 
       @Override 
       public boolean onMenuItemClick(MenuItem menuItem) { 

        switch (menuItem.getItemId()){ 


        } 

        return false; 
       } 
      }); 
      getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
      getSupportActionBar().setDisplayShowHomeEnabled(true); 

      metText = (EditText) findViewById(R.id.editTextMessage); 
      mbtSent = (ImageView) findViewById(R.id.buttonSendMessage); 
      mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView); 
      mChats = new ArrayList<>(); 

      mId = Settings.Secure.getString(this.getContentResolver(), Settings.Secure.ANDROID_ID); 
      mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); 
      //mRecyclerView.setItemAnimator(new SlideInOutLeftItemAnimator(mRecyclerView)); 
      mAdapter = new ChatAdapter(mChats, mId); 
      mRecyclerView.setAdapter(mAdapter); 


      /** 
      * Firebase - Inicialize 
      */ 
      Firebase.setAndroidContext(this); 
      mFirebaseRef = new Firebase("https://testchat-264db.firebaseio.com/").child("chat"); 


      mbtSent.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        String message = metText.getText().toString(); 

        if (!message.isEmpty()) { 
         /** 
         * Firebase - Send message 
         */ 
         mFirebaseRef.push().setValue(new Chat(message, mId,"sender","time","hasAttachment","attachmentLink")); 
        } 

        metText.setText(""); 
       } 
      }); 


      /** 
      * Firebase - Receives message 
      */ 
      mFirebaseRef.addChildEventListener(new ChildEventListener() { 
       @Override 
       public void onChildAdded(DataSnapshot dataSnapshot, String s) { 
        if (dataSnapshot != null && dataSnapshot.getValue() != null) { 
         try{ 

          Chat model = dataSnapshot.getValue(Chat.class); 

          mChats.add(model); 
          mRecyclerView.scrollToPosition(mChats.size() - 1); 
          mAdapter.notifyItemInserted(mChats.size() - 1); 
         } catch (Exception ex) { 
          Log.e(TAG, ex.getMessage()); 
         } 
        } 
       } 

       @Override 
       public void onChildChanged(DataSnapshot dataSnapshot, String s) { 

       } 

       @Override 
       public void onChildRemoved(DataSnapshot dataSnapshot) { 

       } 

       @Override 
       public void onChildMoved(DataSnapshot dataSnapshot, String s) { 

       } 

       @Override 
       public void onCancelled(FirebaseError firebaseError) { 

       } 
      }); 
     } 
    } 

toolbar_menu.xml Einfl

 <menu xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     tools:context="example.gmariotti.it.test21.ToolbarActivity" > 



     <item android:id="@+id/gallery" 
      android:icon="@drawable/attach" 
      android:title="" 
      android:showAsAction="ifRoom" /> 
    </menu> 

Answer 1

korrekte Art und Weise Menü aß während der Unterstützung mit ActionBar

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
setSupportActionBar(toolbar); 

und

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    MenuInflater inflater = getMenuInflater(); 
    inflater.inflate(R.menu.toolbar_menu, menu); 
    return true; 
} 

Answer 2

außer Kraft setzen Wie ich verstand Sie in der Toolbar ein anklickbare Symbol festlegen möchten. Also, lassen Sie uns beginnen:

1) versuchen, in Ihrem activity_set_database.xml verwendenCoordinatorLayout statt RelativeLayout (Sie RelativeLayout innerhalb CoordinatorLayout verwenden können), überprüfen und zu vermeiden, wo es gebraucht wird, ungültig params (ich meine android:layout_above in LinearLayout Android Studio zeigt zum Beispiel diese ungültigen Parameter an.

2) Import in res -> drawbale Ordner mit Icon Pack Drawbale Importeur (es ist in Android Studio) das Symbol, das Sie denken, Symbol ist, das eine Anlage Benutzer für Ihre Anwendung bedeutet.

3) machen Sie kundenspezifische Menüs (lassen Sie es Ihr toolbar_menu.xml) bleiben wird, so ähnlich:

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

    <item 
     android:id="@+id/gallery" 
     android:title="@null" 
    <!-- in this xml file set null, but in AndroidManifest.xml for proper 
     activity you can set android:label="@string/proper_title"--> 
     android:orderInCategory="100" 
     app:showAsAction="ifRoom" 
     android:icon="@drawable/ic_your_proper_icon" 
    <!-- or leave your android:icon="@drawable/attach" if you wish and 
     already have your own icon -->    
    /> 

</menu> 

4) in Ihrem SetDataBase.java statt (Ich lösche meine es an alle):

toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() { 
       @Override 
       public boolean onMenuItemClick(MenuItem menuItem) { 

        switch (menuItem.getItemId()){ 


        } 

        return false; 
       } 
      }); 

Eingabe nach onCreate():

@Override 
public boolean onCreateOptionsMenu(Menu menu) {  
     getMenuInflater().inflate(R.menu.toolbar_menu, menu); 
     //as @user3024215 suggested 
     return true; 
} 

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

     if (id == android.R.id.home) { 
      //here you can simply set onBackPressed(); 
      return true; 
     } 

     if (id == R.id.gallery) { // it's item id in your toolbar_menu.xml 
     //here your code that activates proper actions for user 

     } 
     return super.onOptionsItemSelected(item); 
} 

Ich denke, in gewisser Weise wird es für Sie hilfreich sein.