Android 按钮 在 Fragment 内部单击以打开新的 Fragment
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时间：2020-08-20 06:26:21 来源:igfitidea点击:
Button Click inside Fragment to open up new fragment
提问by Ken Hollis
I don't know how to open up a new fragment on button click, I only know how to open new Activity using intent but when I try to open up new fragment my project app crashes hope someone can help me with my problem
我不知道如何在单击按钮时打开一个新片段，我只知道如何使用 Intent 打开新 Activity 但是当我尝试打开新片段时我的项目应用程序崩溃希望有人可以帮助我解决我的问题
this is what I have:
这就是我所拥有的：
import android.app.Fragment;
import android.os.Bundle;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
public class FragmentTwo extends Fragment {
public FragmentTwo() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_layout_two, container,
false);
// SPINNER1
Spinner spinner1 = (Spinner) view.findViewById(R.id.spinnerSpecialty);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
getActivity(), R.array.specialty_arrays,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter);
// SPINNER2
Spinner spinner2 = (Spinner) view.findViewById(R.id.spinnerLocation);
ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(
getActivity(), R.array.city_array,
android.R.layout.simple_spinner_item);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(adapter);
// BUTTON
Button btnSearch = (Button) view.findViewById(R.id.btnSearch);
btnSearch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnSearch:
//what to put here
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.content_frame, new FragmentThree());
ft.commit();
break;
}
}
});
return view;
}
}
}
LOGCAT:
逻辑猫：
04-01 03:45:25.508: E/AndroidRuntime(1618): FATAL EXCEPTION: main
04-01 03:45:25.508: E/AndroidRuntime(1618): java.lang.NullPointerException
04-01 03:45:25.508: E/AndroidRuntime(1618): at com.droid.FragmentThree.onCreateView(FragmentThree.java:30)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.app.Fragment.performCreateView(Fragment.java:1695)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:885)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1057)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.app.BackStackRecord.run(BackStackRecord.java:682)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.app.FragmentManagerImpl.run(FragmentManager.java:441)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.os.Handler.handleCallback(Handler.java:730)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.os.Handler.dispatchMessage(Handler.java:92)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.os.Looper.loop(Looper.java:137)
04-01 03:45:25.508: E/AndroidRuntime(1618): at android.app.ActivityThread.main(ActivityThread.java:5103)
04-01 03:45:25.508: E/AndroidRuntime(1618): at java.lang.reflect.Method.invokeNative(Native Method)
04-01 03:45:25.508: E/AndroidRuntime(1618): at java.lang.reflect.Method.invoke(Method.java:525)
04-01 03:45:25.508: E/AndroidRuntime(1618): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
04-01 03:45:25.508: E/AndroidRuntime(1618): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
04-01 03:45:25.508: E/AndroidRuntime(1618): at dalvik.system.NativeStart.main(Native Method)
回答by Vamshi
Try this:
尝试这个：
From below code change id show_fragment to match with your layout XML id..
从下面的代码更改 id show_fragment 以匹配您的布局 XML id..
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnSearch:
//what to put here
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.show_fragment, new TestFragment(), "fragment_screen");
ft.commit();
break;
}
}
<FrameLayout
android:id="@+id/show_fragment"
android:layout_width="match_parent"
android:layout_height="0dp">
</FrameLayout>
回答by Ranjith
I hope this helps you
我希望这可以帮助你
// Create new fragment and transaction
Fragment newFragment = new ExampleFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
回答by RobinHood
Below piece of code help you to call new fragment on button click.
下面的一段代码可帮助您在单击按钮时调用新片段。
Button btnSearch = (Button) view.findViewById(R.id.btnSearch);
btnSearch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnSearch:
FragmentHome home = new FragmentHome(); //this is your new fragment.
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.activity_main_content_fragment, home);
ft.setTransition(FragmentTransaction.TRANSIT_ENTER_MASK);// it will anim while calling fragment.
ft.addToBackStack(null); // it will manage back stack of fragments.
ft.commit();
break;
}
}
});
回答by Tamilselvan Kalimuthu
You are going to open the fragment from fragment so dont forget getActivity().
您将从片段中打开片段，所以不要忘记 getActivity()。
getActivity().getSupportFragmentManager()
.beginTransaction()
.replace(R.id.content_frame, new fragmentClass())
.addToBackStack(null).commitAllowingStateLoss();
R.id.content_frame -> id of the frame layout
R.id.content_frame -> 框架布局的 id
fragmentClass -> Your second fragment
fragmentClass -> 你的第二个片段
finally
最后
commit() or commitAllowingStateLoss()
commit() 或 commitAllowingStateLoss()
