Android 操作栏不可见

Question

I am trying to add an option menu in actionbar to my existing app but it is not working. If I create a new project with "hello world" default app I can see the button in action bar. The onCreateOptionMenu() method seems never caught in debug with breakpoint, what's wrong ??

I'm working with API 14 on both app and this is my MainActivity code.

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

public class Principale extends Activity {


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.ecran_d_acceuil);


}
public boolean onCreateOptionMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.principale, menu);
    return true;
}
 }

My menu.xml code

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
    android:id="@+id/action_settings"
    android:orderInCategory="100"
    android:showAsAction="never"
    android:title="@string/action_settings"/>
</menu>

manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="14" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.myapp.Principale"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.myapp.Home"
            android:label="@string/title_activity_home" >
        </activity>
        <activity
            android:name="com.example.myapp.ListDir"
            android:label="@string/title_activity_list_dir" >
        </activity>
    </application>
</manifest>

Answer 1

In my case, what fixed the issue, was the answer of this question ; to remove

android:theme="@style/AppTheme"

from the tag in the Manifest.

Answer 2

Have you tried to set the app theme to a theme that supports the ActionBar , like Theme.Holo.Light ?

Also, in your Activity you can try getActionBar().show(); .

Answer 3

Principale 扩展 ActionBarActivity 应该处理的问题

Answer 4

You have extended Activity. Try extending ActionBarActivity in java code

Answer 5

Spent 3 hours and eventually fixed it! Forget removing android:theme="@style/AppTheme" from your manifest. It makes run-time error. This is how I fixed the problem. Your activity should extend AppCompatActivity instead of Activity.

Answer 6

For your information, I solved my problem of the actionBar by going on the layout XML file and then pressing on View Option -> Show Layout Decorations.

Hope it will solve your problem.

Cheers.

Answer 7

检查您的清单文件在活动声明中，如果此行存在，则将其删除。

android:theme="@style/AppTheme.NoActionBar"

Answer 8

your main activity needs to be like this:

import android.os.Bundle;
import android.app.ActionBar;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends Activity {

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

    ActionBar actionBar = getActionBar();
    actionBar.hide();

    actionBar.show();
    actionBar.setSubtitle("subtitle");
    actionBar.setTitle("title"); 


}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main, menu);
    return true;
}

@Override  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.action_refresh:
      Toast.makeText(this, "Menu Item 1 selected", Toast.LENGTH_SHORT)
          .show();
      break;

         default:
             break;
             }
    return true;
    } 



}

and your main.xml like this:

 <menu xmlns:android="http://schemas.android.com/apk/res/android" >

     <item
         android:id="@+id/action_refresh"
         android:orderInCategory="100"
         android:showAsAction="always"
         android:icon="@drawable/ic_action_search"
         android:title="Refresh"/>
    <item
        android:id="@+id/action_settings"
        android:title="Settings">
    </item>

</menu> 

this is a good and simple guide to creating an action bar: http://www.vogella.com/tutorials/AndroidActionBar/article.html

Answer 9

on create of your activity.

getSupportActionBar().setDisplayShowCustomEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(false);
        customNav = LayoutInflater.from(this).inflate(
                R.layout.action_bar_customvieew, null);
        getSupportActionBar().setCustomView(customNav);

Answer 10

What solved my issue in this regard was, in the design view , click the eye icon ( view options ) and select Show Layout Decorations .

Answer 11

Make sure you don't use:

requestWindowFeature(Window.FEATURE_NO_TITLE);

in your layout .xml file.

Answer 12

在我的情况下，操作栏菜单在使用 public class MainActivity extends Activity { } 时不可见，但在使用 public class MainActivity extends ActionBarActivity{ } 时可见

Answer 13

我遇到了同样的问题，我确认如果您从AndroidManifest.xml删除android:theme="@style/AppTheme" ，它将解决您的问题。

Answer 14

您应该扩展AppCompatActivity 。

Answer 15

you have to call the method setHasOptionsMenu(true); in the OnCreate Method

Answer 16

我正在使用三星年轻 2 作为 android 模拟器，我有同样的问题，我通过从 manifest.xml 中删除android:theme =""并将主题更改为另一个主题支持操作栏来解决这个问题

Answer 17

getSupportActionBar().show();

只需将此代码粘贴到您的 java onCreate函数中即可。

Answer 18

My Android studio version is 4.2.1 for Windows 64-bit (933 MiB). In my case, I did not have the "Show Layout Decorations" option in the design view. What I did is I solved my problem of the action bar by going on the layout XML file and then pressing on View Option -> Show System UI

ActionBar visibility in android studio：