java - Android Activity 仅在主 Activity 中显示并且未正确显示

Question

操作栏未显示在主 Activity 中，而另一个 Activity 中存在相同的代码，并且另一个 Activity 操作栏溢出未按右上角的列表显示

1. 图像 1:按下菜单键的主要 Activity

图像 2:显示消息 Activity

主要 Activity 代码:

public class MainActivity extends ActionBarActivity {
EditText t;
public final static String sendMessageextra="com.example.example2.textmessage";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    t=(EditText) findViewById(R.id.textmessage);
}



@Override
public boolean onCreateOptionsMenu(Menu menu) {

    getMenuInflater().inflate(R.menu.activity_main_actions, menu);
    return super.onCreateOptionsMenu(menu);
}

public void sendMessage(View v){
    Intent sendmessageintent=new Intent(this,showMessage.class);
    String messagestring=t.getText().toString();
    sendmessageintent.putExtra(sendMessageextra, messagestring);
    startActivity(sendmessageintent);
}

}

显示消息 Activity :

public class showMessage extends Activity{
TextView t;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sendmessage);
    t=(TextView) findViewById(R.id.showmessage);
    showmessage();
}


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


public void showmessage(){
    Intent intent=getIntent();
    String message=intent.getStringExtra(MainActivity.sendMessageextra);
    t.setText(message);
    Log.i("Set New Text Box", "Text BOx");
}

}

Activity 主要actions.xml:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- Search Widget -->
<item android:id="@+id/action_search"
      android:icon="@drawable/ic_action_search"
      android:title="@string/action_search"
      android:showAsAction="ifRoom"
      android:actionViewClass="android.widget.SearchView"/>

<!-- Location Found -->
<item android:id="@+id/action_location_found"
      android:icon="@drawable/ic_action_location_found"
      android:title="@string/action_location_found"
      android:showAsAction="never" />
<!-- Help -->
<item android:id="@+id/action_help"
      android:icon="@drawable/ic_action_help"
      android:title="@string/action_help" 
      android:showAsAction="never"/>
</menu>

android 菜单文件: Activity list 文件:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.example2"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            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.example2.showMessage"
            android:label="Show Message" android:parentActivityName="com.example.example2.MainActivity"/>
    </application>
</manifest>

Answer 1

如果您想在每个 Activity 的操作栏右侧显示搜索图标，则只需在 actions.xml 中进行更改，而不是将 android:showAsAction="ifRoom"更改为 android:showAsAction="always"