ActionBar bar = getSupportActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab tab1 = bar.newTab();
ActionBar.Tab tab2 = bar.newTab();
tab1.setText("Fragment A");
tab2.setText("Fragment B");
tab1.setTabListener(new MyTabListener<FragmentA>(this, "tab1",
FragmentA.class, null));
tab2.setTabListener(new MyTabListener<FragmentB>(this, "tab1",
FragmentB.class, null));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// app icon in action bar clicked; go Location selection
Intent intent = new Intent(FragmentDemoActivity.this,
TestActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("tab", getSupportActionBar()
.getSelectedNavigationIndex());
}
监听器类是指实现了监听器接口的类。
public class MyTabListener<T extends Fragment> implements ActionBar.TabListener {
private final FragmentActivity mActivity;
private final String mTag;
private final Class<T> mClass;
private final Bundle mArgs;
private Fragment mFragment;
public MyTabListener(FragmentActivity activity, String tag, Class<T> clz,
Bundle args) {
mActivity = activity;
mTag = tag;
mClass = clz;
mArgs = args;
FragmentTransaction ft = mActivity.getSupportFragmentManager()
.beginTransaction();
mFragment = mActivity.getSupportFragmentManager().findFragmentByTag(
mTag);
if (mFragment != null && !mFragment.isDetached()) {
ft.detach(mFragment);
}
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft = mActivity.getSupportFragmentManager().beginTransaction();
if (mFragment == null) {
mFragment = Fragment
.instantiate(mActivity, mClass.getName(), mArgs);
ft.add(android.R.id.content, mFragment, mTag);
ft.commit();
} else {
ft.attach(mFragment);
ft.commit();
}
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft = mActivity.getSupportFragmentManager().beginTransaction();
if (mFragment != null) {
ft.detach(mFragment);
ft.commitAllowingStateLoss();
}
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
Fragmentclass
public class FragmentB extends Fragment {
Button button;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup group, Bundle saved)
{
return inflater.inflate(R.layout.frag_b, group, false);
}
@Override
public void onActivityCreated (Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
button = (Button) getActivity().findViewById(R.id.button2);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Fragment B");
builder.setMessage("What would you like to do?");
builder.setPositiveButton("Nothing", null);
builder.setNegativeButton("Leave me alone!", null);
builder.show();
}
});
}
}
我希望在FragmentB中包含以下活动。
public class TestActivity extends Activity {
Button b1, b2;
TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.testactivity);
b1 = (Button) findViewById(R.id.button1);
b2 = (Button) findViewById(R.id.button2);
tv = (TextView) findViewById(R.id.textView1);
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
tv.setText("You Clicked on Button 1");
}
});
b2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
tv.setText("You Clicked on Button 2");
}
});
}
}
我有很多创建好的活动要包含在片段中,但在片段类的onActivityCreated方法中重新创建这些活动是不可想象的。因此,我需要修改我的主应用程序。