In my app, I have one activity and two fragments. What I'm trying to do, is to navigate between this two fragments back or front with button. Each navigate button is defined in fragment.
The first problem is, with the code that is below, I get the exception on application run:
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{...MainActivity}:
java.lang.IllegalArgumentException: No view found for id 0x7f0c0050 for fragment Fragment1{b41da690 #0 id=0x7f0c0050}
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f0c0050 for fragment Fragment1{b41da690 #0 id=0x7f0c0050}
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:823)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)
at android.app.BackStackRecord.run(BackStackRecord.java:635)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)
at android.app.Activity.performStart(Activity.java:5017)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2032)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
CODE:
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set desired fragment for the first time
setFragment(this, new Fragment1());
}
public void switch_fragment(View view, String fragmentID) {
Fragment newFragment = null;
switch (fragmentID) {
case Fragment1.ID:
newFragment = new Fragment1();
break;
case Fragment2.ID:
newFragment = new Fragment2();
break;
}
setFragment(this, newFragment);
}
public static void setFragment(Activity activity, Fragment fragment) {
FragmentTransaction fragmentTransaction = activity.getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_placeHolder, fragment);
fragmentTransaction.commit();
}
}
main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/fragment_placeHolder"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragment1"
/>
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragment2"
/>
</RelativeLayout>
Fragment1.java
public class Fragment1 extends Fragment {
public static final String ID = "1";
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment1, container, false);
}
}
fragment1.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="GO TO FRAGMENT 1"
android:id="@+id/btn_1"
android:onClick="switch_fragment"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
Fragment2.java
public class Fragment2 extends Fragment {
public static final String ID = "2";
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment2, container, false);
}
}
fragment2.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="GO TO FRAGMENT 2"
android:id="@+id/btn_2"
android:onClick="switch_fragment"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
If this sample is wrong way of achieving this, can you please link some similar example for newbie.
You missed a very important part is setContentView and before using replace you should have an existing fragment. So in onCreate change:
// set desired fragment for the first time
setFragment(this, new Fragment1());
Should be changed to:
setContentView(R.layout.main_activity);//then
// set desired fragment for the first time
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
// The id specified here identifies which ViewGroup to
// append the Fragment to.
ft.add(R.id.fragment_placeHolder, new Fragment1());
ft.commit();
Try to replace:
... activity.getFragmentManager()
With:
... getSupportFragmentManager()
and remove:
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragment1"
/>
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragment2"
/>
Finally, change the switch_fragment to:
public void switch_fragment(View view) {
Fragment newFragment = null;
switch (view.getID()) {
case R.id.btn_2:
newFragment = new Fragment1();
break;
case R.id.btn_1:
newFragment = new Fragment2();
break;
}
setFragment(this, newFragment);
}
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