我知道这还有其他答案，但我环顾四周并尝试了其他解决方案；所有这些都不起作用。
我有一个包含可点击项目的菜单；当点击时，他们将Fragment主屏幕上的 a 替换为另一个Fragment。
这是我的代码：
package com.nanospark.cnc;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBarActivity;
//import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
GridLayout_Fragment profileGridFragment = new GridLayout_Fragment();
EventList_Fragment eventListFragment = new EventList_Fragment();
ContactList_Fragment contactListFragment = new ContactList_Fragment();
FragmentManager transactionManager = getSupportFragmentManager();
FragmentTransaction transaction;
//CustomIOIO customioio;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(savedInstanceState == null){
transaction = transactionManager.beginTransaction();
transaction.replace(R.id.fragment_frame, profileGridFragment);
transaction.commit();
}
//insert the initial fragment for when the app boots.
/* customioio = (CustomIOIO) getApplicationContext();
customioio.create();
customioio.start();*/
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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();
switch (id) {
case R.id.action_settings:
openSettings();
return true;
case R.id.action_home:
openHome();
return true;
case R.id.action_events:
openEvents();
return true;
case R.id.action_help:
openHelp();
return true;
case R.id.action_contacts:
openContacts();
return true;
}
return super.onOptionsItemSelected(item);
}
private void openContacts() {
transaction = transactionManager.beginTransaction();
transaction.replace(R.id.fragment_frame, contactListFragment);
transaction.commit();
}
private void openHome() {
transaction = transactionManager.beginTransaction();
transaction.replace(R.id.fragment_frame, profileGridFragment);
transaction.commit();
}
private void openHelp() {
}
private void openEvents() {
transaction = transactionManager.beginTransaction();
transaction.replace(R.id.fragment_frame, eventListFragment);
transaction.commit();
}
private void openSettings() {
}
}
我不确定为什么以前Fragment的 s 仍然可见？
编辑 - 添加我的 active_main.xml 布局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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"
tools:context="com.nanospark.cnc.MainActivity" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:orientation="vertical" >
<FrameLayout
android:id="@+id/fragment_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</FrameLayout>
</LinearLayout>
</RelativeLayout>