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我的應用程序使用片段和滑動來導航不同的頁面。我想在每個片段活動上都有一個圖像按鈕,以便在按下第一個活動時應該可用。我怎樣才能做到這一點。我試過viewpager.setcurrentitem選項,但它只在主要活動中可用。並在片段活動viewpager不可用。我知道有一種方法可以使用sethome按鈕的android默認屬性。但我想在每個片段中有一個圖像按鈕。 這是我的主要活動在每個片段上設置主頁按鈕
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding
// tab. We can also use ActionBar.Tab#select() to do this if we have
// a reference to the Tab.
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
Tab tab = actionBar.newTab().setIcon(R.drawable.prf).setText(getString(R.string.title_section1)).setTabListener(this);
actionBar.addTab(tab, true);
tab = actionBar.newTab().setIcon(R.drawable.pack).setText(getString(R.string.title_section2)).setIcon(R.drawable.pack).setTabListener(this);
actionBar.addTab(tab);
tab = actionBar.newTab().setIcon(R.drawable.call).setText(getString(R.string.title_section3)).setTabListener(this);
actionBar.addTab(tab);
tab = actionBar.newTab().setIcon(R.drawable.prom).setText(getString(R.string.title_section4)).setTabListener(this);
actionBar.addTab(tab);
tab = actionBar.newTab().setIcon(R.drawable.infoin).setText(getString(R.string.title_section5)).setTabListener(this);
actionBar.addTab(tab);
}
@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 void onTabSelected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabReselected(ActionBar.Tab tab,FragmentTransaction fragmentTransaction) {
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0 :
return new Home();
case 1:
return new info();
case 2:
return new Plan();
}
return null;
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
}
看來你的問題似乎是你不知道碎片如何與活動交流,反之亦然。 閱讀此:http://developer.android.com/training/basics/fragments/communicating.html然後它會很容易地添加您的主頁按鈕到所有的片段,並使用您的MainActivity中的viewPager.setCurrentItem() 。 – FWeigl