Java 操作栏中的图标不显示
我正在使用操作栏,但由于某些原因,图标没有显示出来 这是我的活动xml代码Java 操作栏中的图标不显示,java,android,xml,android-layout,Java,Android,Xml,Android Layout,我正在使用操作栏,但由于某些原因,图标没有显示出来 这是我的活动xml代码 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.a
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.menz.projectv4.MainActivity"
tools:showIn="@layout/activity_main">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/LVTimetable"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:choiceMode="none" />
</RelativeLayout>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.menz.projectv4.MainActivity">
<item android:id="@+id/action_addReminder"
android:title="Add Reminder"
android:icon="@drawable/add"
app:showAsAction="ifRoom"/>
<item android:id="@+id/action_search"
android:title="Search"
android:icon="@drawable/search"
app:showAsAction="ifRoom"/>
</menu>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.menz.projectv4">
<application
android:allowBackup="true"
android:icon="@drawable/logo"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@android:style/Theme.DeviceDefault.Light.DarkActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".add" />
<activity android:name=".display" />
<activity android:name=".search"></activity>
</application>
</manifest>
它仍然不工作,然后我试图改变应用程序的主题仍然是一样的事情
提前谢谢
下面是活动Java文件
package com.example.menz.projectv4;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CursorAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
public class MainActivity extends Activity implements ListView.OnItemClickListener{
static String row_id = "row_id";
private ListView Timetable ;
private CursorAdapter cursorAdapter;
private DatabaseConnector databaseConnector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
Timetable = (ListView)findViewById(R.id.LVTimetable);
Timetable.setOnItemClickListener(this);
String [] from = new String [] {"Subject","Assignment"};
int [] to = new int [] {R.id.TVTitle,R.id.TVSubject};
cursorAdapter = new SimpleCursorAdapter(MainActivity.this,R.layout.list_view_layout,null,from,to);
Timetable.setAdapter(cursorAdapter);
}
@Override
protected void onResume() {
super.onResume();
new GetAllTask().execute((Object[]) null);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent viewTask = new Intent(this,display.class);
viewTask.putExtra(row_id,id);
startActivity(viewTask);
}
private class GetAllTask extends AsyncTask<Object , Object , Cursor>
{
DatabaseConnector databaseConnector = new DatabaseConnector(MainActivity.this);
@Override
protected Cursor doInBackground(Object... params) {
try {
databaseConnector.open();
} catch (SQLException e) {
e.printStackTrace();
}
return databaseConnector.getAllTasks();
}
@Override
protected void onPostExecute(Cursor result) {
cursorAdapter.changeCursor(result);
databaseConnector.close();
}
}
@Override
protected void onPause() {
super.onPause();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_addReminder) {
startActivity(new Intent(this,add.class));
}
return super.onOptionsItemSelected(item);
}
package com.example.menz.projectv4;
导入android.app.Activity;
导入android.app.ListActivity;
导入android.content.Intent;
导入android.database.Cursor;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.support.design.widget.FloatingActionButton;
导入android.support.design.widget.Snackbar;
导入android.support.v7.app.AppActivity;
导入android.support.v7.widget.Toolbar;
导入android.view.view;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.widget.AdapterView;
导入android.widget.ArrayAdapter;
导入android.widget.CursorAdapter;
导入android.widget.ListView;
导入android.widget.simpledapter;
导入android.widget.SimpleCursorAdapter;
导入java.sql.SQLException;
导入java.util.ArrayList;
导入java.util.HashMap;
公共类MainActivity扩展活动实现ListView.OnItemClickListener{
静态字符串row\u id=“row\u id”;
私有列表视图时间表;
专用游标适配器游标适配器;
专用数据库连接器数据库连接器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.content\u main);
时间表=(列表视图)findViewById(R.id.lvtimeline);
时间表。塞托尼麦克利克监听器(本);
字符串[]from=新字符串[]{“主题”,“赋值”};
int[]to=newint[]{R.id.TVTitle,R.id.TVSubject};
cursorAdapter=新的SimpleCursorAdapter(MainActivity.this,R.layout.list\u view\u layout,null,from,to);
时间表。设置适配器(游标适配器);
}
@凌驾
受保护的void onResume(){
super.onResume();
新建GetAllTask().execute((对象[])null);
}
@凌驾
public void onItemClick(AdapterView父对象、视图、整型位置、长id){
Intent viewTask=新的Intent(这个,display.class);
viewTask.putExtra(行id,id);
startActivity(viewTask);
}
私有类GetAllTask扩展了AsyncTask
{
DatabaseConnector DatabaseConnector=新的DatabaseConnector(MainActivity.this);
@凌驾
受保护的游标doInBackground(对象…参数){
试一试{
databaseConnector.open();
}捕获(SQLE异常){
e、 printStackTrace();
}
返回databaseConnector.getAllTasks();
}
@凌驾
受保护的void onPostExecute(游标结果){
cursorAdapter.changeCursor(结果);
databaseConnector.close();
}
}
@凌驾
受保护的void onPause(){
super.onPause();
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(右菜单菜单菜单主菜单);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//处理操作栏项目单击此处。操作栏将
//自动处理Home/Up按钮上的点击,只要
//在AndroidManifest.xml中指定父活动时。
int id=item.getItemId();
//noinspection SimplifiableIf语句
if(id==R.id.action\u add提醒){
startActivity(新意图(这个,add.class));
}
返回super.onOptionsItemSelected(项目);
}
以下是活动的屏幕截图
你能试试这个吗:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
tools:context="com.example.menz.projectv4.MainActivity">
<item android:id="@+id/action_addReminder"
android:title="Add Reminder"
android:icon="@drawable/add"
android:showAsAction="always"/>
<item android:id="@+id/action_search"
android:title="Search"
android:icon="@drawable/search"
android:showAsAction="always"/>
</menu>
试试这个
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto" >
<item
android:id="@+id/save_btn"
android:orderInCategory="100"
android:title="Save"
android:icon="@drawable/icon_save"
app:showAsAction="always"/>
用以下代码替换
菜单\u main.xml
:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.menz.projectv4.MainActivity" >
<item
android:id="@+id/action_chat"
android:orderInCategory="100"
android:title="@string/action_settings"
android:icon="@drawable/add"
app:showAsAction="always"/>
<item
android:id="@+id/action_search"
android:orderInCategory="100"
android:title="@string/action_settings"
android:icon="@drawable/search"
app:showAsAction="always"/>
单击菜单,然后尝试向我们提供您的java代码!可能您没有在其中设置某些内容?您是否在活动类文件中实现了OnCreateOptions菜单发布您的活动java类“@覆盖受保护的void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.content\u main);timeline=(ListView)findViewById(R.id.lvtimeline);timeline.setOnItemClickListener(this);String[]from=new String[]{“Subject”,“Assignment”};int[]to=new int[]{R.id.TVTitle,R.id.TVSubject};cursorAdapter=new simplecrsoradapter(main.this,R.layout.list_视图_布局,null,from,to);timeline.setAdapter(cursorAdapter);}“这是你的
ActionBar
show吗?你能发布截图吗?已经这样做了:D检查我添加的活动java文件安卓id:showAsAction=“ifRoom”/>这部分说我们不能使用它,而是使用app:showAsAction=“ifRoom”/>不,我修改了我的菜单,就像你的代码只是缺少了orderInCategory,但仍然没有显示它不起作用它只是更改了文本,而不是添加和搜索设置和设置
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.menz.projectv4.MainActivity" >
<item
android:id="@+id/action_chat"
android:orderInCategory="100"
android:title="@string/action_settings"
android:icon="@drawable/add"
app:showAsAction="always"/>
<item
android:id="@+id/action_search"
android:orderInCategory="100"
android:title="@string/action_settings"
android:icon="@drawable/search"
app:showAsAction="always"/>