我有一个带后退按钮的工具栏。我试图通过膨胀toolbar_menu.xml在工具栏中放置一个附件按钮，但它没有显示。我在下面附上了我的代码。
具有工具栏的活动：
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
<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>
答案 0 :(得分：0)
使用支持操作栏时更正菜单的方法
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
并覆盖
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.toolbar_menu, menu);
return true;
}
答案 1 :(得分：0)
据我所知，您想在工具栏中设置一些可点击图标。所以，让我们开始吧：
1）尝试在 activity_set_database.xml CoordinatorLayout中使用而不是RelativeLayout（您可以在RelativeLayout中使用CoordinatorLayout），并且避免，在需要的地方，无效的params（我的意思是android:layout_above中的LinearLayout。例如，Android Studio会显示那些无效的参数。
2）导入 res - ＆gt;带有图标包Drawbale导入程序的拉动框文件夹（在Android Studio中）您认为是表示您的应用用户的附件的图标。
3）制作自定义菜单（让它保留 toolbar_menu.xml ），类似：
<?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）在你的 SetDataBase.java 而不是（我的意思是删除它）：
toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId()){
}
return false;
}
});
在 onCreate（）之后输入：
@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);
}
我认为，从某种程度上说，它对你有所帮助。