显示取决于ViewPager Android的菜单项 [英] Show menu items depending ViewPager Android
本文介绍了显示取决于ViewPager Android的菜单项的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我的Android应用中有一个带有片段的ViewPager.我想显示操作栏菜单项,具体取决于ViewPager的片段.我已经阅读了一些有关此问题,但找不到正确的解决方案.我的ViewPager的代码是这样的:
I have a ViewPager with fragments in my Android app. I want to show Action Bar menu item depending the fragment of the ViewPager. I have readen some questions about this but I can´t find the correct solution. My ViewPager´s code is this:
public class My_Activity extends ActionBarActivity {
private ViewPager mViewPager;
String idioma;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_main);
ActionBar actionBar = getSupportActionBar(); // || getActionBar();
actionBar.setIcon(getResources().getDrawable(R.drawable.navbar_logo));
actionBar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#CC3333")));
actionBar.setTitle("Hello");
mViewPager = (ViewPager) findViewById(R.id.viewpager);
PagerTabStrip pagerTabStrip = (PagerTabStrip) findViewById(R.id.pagerTabStrip);
pagerTabStrip.setTabIndicatorColor(getResources().getColor(R.color.blanco));
Title_Liga_Adapter titleAdapter = new Title_Liga_Adapter(getSupportFragmentManager());
mViewPager.setAdapter(titleAdapter);
mViewPager.setCurrentItem(0);
getSupportActionBar().setIcon(R.drawable.navbar_logo);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
if (mViewPager.getCurrentItem() == 4) {
getMenuInflater().inflate(R.menu.menu_comunidad,
menu);
} else {
}
return true;
}
/* *
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
menu.findItem(R.id.action_search)
.setVisible(true);
return super.onPrepareOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
this.finish();
return true;
case R.id.action_search:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
例如,我希望CurrentItem为4时显示菜单项图标.
I want that when CurrentItem is 4 for example show menu items icons.
推荐答案
首先在 onCreate 方法中创建 addOnPageChangeListener
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// ...
mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
invalidateOptionsMenu();
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
然后您覆盖onCreateOptionMenu()
Then you override onCreateOptionMenu()
@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);
if (mViewPager.getCurrentItem()==0){
menu.findItem(R.id.action_search).setVisible(true);
} else if(mViewPager.getCurrentItem()==1){
menu.findItem(R.id.action_search).setVisible(false);
} else if(mViewPager.getCurrentItem()==2){
// configure
} else if(mViewPager.getCurrentItem()==3){
// configure
}
return super.onCreateOptionsMenu(menu);
}
这篇关于显示取决于ViewPager Android的菜单项的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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