这是我的片段的代码：
public class MainFragment extends Fragment {
private final AnimEffect forwardAnimation = AnimEffect.LEFT_TO_RIGHT;
private String couponNumber;
private EditText couponET;
@Override
public void onResume() {
((MainActivity) getActivity()).toggleBtn(false);
super.onResume();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.mainfragment, container, false);
ImageButton profile = (ImageButton) view.findViewById(R.id.Profile);
ImageButton scan = (ImageButton) view.findViewById(R.id.Scan);
Button validate = (Button) view.findViewById(R.id.Validate);
couponET = (EditText) view.findViewById(R.id.couponET);
OnClickListener profileListener = new OnClickListener() {
@Override
public void onClick(View v) {
((MainActivity) getActivity()).navigateTo(ProfileFragment.class, forwardAnimation);
}
};
profile.setOnClickListener(profileListener);
OnClickListener scanListener = new OnClickListener() {
@Override
public void onClick(View v) {
((MainActivity) getActivity()).navigateTo(ScannerFragment.class, forwardAnimation);
}
};
scan.setOnClickListener(scanListener);
OnClickListener validateListener = new OnClickListener() {
@Override
public void onClick(View v) {
String response = couponET.getText().toString();
if (response.contentEquals("ok")) {
((MainActivity) getActivity()).navigateTo(OKResponseFragment.class, forwardAnimation);
}
}
};
validate.setOnClickListener(validateListener);
return view;
}
@Override
public void onStart() {
super.onStart();
if ((couponET != null) && (couponNumber != null)) {
couponET.setText(couponNumber);
}
}
public void setCouponNumber(String number) {
couponNumber = number;
if (couponET != null) {
couponET.setText(number);
}
}
public void alert() {
final Dialog dialog = new Dialog(getActivity());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.warningdialog);
dialog.setCancelable(true);
Button ok = (Button) dialog.findViewById(R.id.cancel);
ok.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
dialog.show();
}
}
现在，第一次，编辑文本完美运行，我可以使用它，可以在上面写字，任何东西。如果我改变片段，然后回来，我什么也做不了。如果我按下编辑文本，键盘不会出现。更重要的是，如果我不关闭键盘，在我更改片段之后，以便在我返回时打开键盘，如果我按下 EditText 然后在键盘上写字，什么也不会出现。
这是我的 FragmentActivity，如果有帮助的话：
public class MainActivity extends android.support.v4.app.FragmentActivity {
public static boolean scanner_active;
private Fragment f;
public static Intent login;
SharedPreferences settings;
private AnimEffect backPressAnimation = AnimEffect.LEFT_TO_RIGHT;
private ImageButton backButton;
@Override
public void onCreate(Bundle savedInstanceState) {
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
login = new Intent(MainActivity.this, WelcomeActivity.class);
}
private void init() {
backButton = (ImageButton) findViewById(R.id.backButton);
OnClickListener backButtonListener = new OnClickListener() {
@Override
public void onClick(View v) {
Class<?> previousFragment = getPreviousScreen();
if (previousFragment != null) {
navigateTo(previousFragment, backPressAnimation);
} else {
finish();
if(!Constants.remind){
startActivity(login);
}
}
}
};
backButton.setOnClickListener(backButtonListener);
String name;
TextView nameTV = (TextView) findViewById(R.id.nameTV);
if (Constants.remind) {
settings = getSharedPreferences("PrefFile", 0);
name = settings.getString("email", null);
} else {
name = Constants.email;
}
nameTV.setText(name);
navigateTo(MainFragment.class, AnimEffect.FADE_IN);
}
@Override
public void onBackPressed() {
Class<?> previousFragment = getPreviousScreen();
if (previousFragment != null) {
navigateTo(previousFragment, backPressAnimation);
} else {
finish();
if(!Constants.remind){
startActivity(login);
}
}
}
public void navigateTo(Class<?> fragmentClass, AnimEffect effect) {
removeOldFragment(effect);
int animIn = Util.getInAnimation(effect);
try {
f = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
LogService.err("navigate", e.getMessage(), e, LogService.LOG_LEVEL_LITE);
}
if (f != null) {
getSupportFragmentManager().beginTransaction().disallowAddToBackStack().setCustomAnimations(animIn, 0).add(R.id.fragment, f, fragmentClass.getSimpleName()).commitAllowingStateLoss();
}
}
public Class<?> getPreviousScreen() {
if ((f instanceof MainFragment) && f.isAdded()) {
return null;
} else if ((f instanceof ProfileFragment) && f.isAdded()) {
backPressAnimation = AnimEffect.LEFT_TO_RIGHT;
return MainFragment.class;
} else if ((f instanceof HelpFragment) && f.isAdded()) {
backPressAnimation = AnimEffect.LEFT_TO_RIGHT;
return MainFragment.class;
} else if ((f instanceof ScannerFragment) && f.isAdded()) {
backPressAnimation = AnimEffect.LEFT_TO_RIGHT;
return MainFragment.class;
} else if ((f instanceof OKUserResponseFragment) && f.isAdded()) {
backPressAnimation = AnimEffect.LEFT_TO_RIGHT;
return MainFragment.class;
} else if ((f instanceof OKResponseFragment) && f.isAdded()) {
backPressAnimation = AnimEffect.LEFT_TO_RIGHT;
return MainFragment.class;
}
return null;
}
private void removeOldFragment(AnimEffect effect) {
if ((f != null) && f.isAdded()) {
int animOut = Util.getOutAnimation(effect);
getSupportFragmentManager().beginTransaction().setCustomAnimations(0, animOut).remove(f).commitAllowingStateLoss();
getSupportFragmentManager().executePendingTransactions();
}
}
public void toggleBtn(boolean b) {
backButton.setEnabled(b);
if(b){
backButton.setImageResource(R.drawable.back);
}else{
backButton.setImageResource(R.drawable.besmart2);
}
}
public void setCouponText(String text) {
// TODO Auto-generated method stub
navigateTo(MainFragment.class, backPressAnimation);
if ((f != null) && (f instanceof MainFragment)) {
((MainFragment) f).setCouponNumber(text);
}
}
}
编辑：它适用于 4.x，但不适用于以前的操作系统，如 2.3.5 或 3.2