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Why do I get the error that line 92 is an unreachable statement? The error is in this line:
final RadioButton r1 = (RadioButton) getView().findViewById(R.id.radio1);
Code:
public class TabFragmentA extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return (RelativeLayout) inflater.inflate(R.layout.tab_layout_a, container, false);
final RadioButton r1 = (RadioButton) getView().findViewById(R.id.radio1); //the error is here
final RadioButton r2 = (RadioButton) getView().findViewById(R.id.radio2);
final ImageView iv1 = (ImageView) getView().findViewById(R.id.iv1);
final ImageView iv2 = (ImageView) getView().findViewById(R.id.iv2);
iv1.setVisibility(View.INVISIBLE);
iv2.setVisibility(View.INVISIBLE);
r1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(r1.isChecked())
{
r2.setChecked(false);
iv2.setVisibility(View.INVISIBLE);
iv1.setVisibility(View.VISIBLE);
}
}
});
r2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(r2.isChecked())
{
r1.setChecked(false);
iv1.setVisibility(View.INVISIBLE);
iv2.setVisibility(View.VISIBLE);
}
}
});
}
}
Logcat error:
01-23 02:43:31.082 1903-1903/br.com.eddboytools.PreDim E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: br.com.eddboytools.PreDim, PID: 1903
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference
at br.com.eddboytools.PreDim.TabFragmentA.onCreateView(TabFragmentA.java:29)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
at android.view.View.measure(View.java:17430)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:875)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17430)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
at android.view.View.measure(View.java:17430)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17430)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
at android.view.View.measure(View.java:17430)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:447)
at android.view.View.measure(View.java:17430)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560)
at android.view.View.measure(View.java:17430)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1166)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-23 02:43:31.094 1903-1915/br.com.eddboytools.PreDim I/art﹕ Background partial concurrent mark sweep GC freed 261(11KB) AllocSpace objects, 0(0B) LOS objects, 27% free, 1328KB/1840KB, paused 20.856ms total 51.174ms
838
1(a) is compiled, line 12 raises an unreachable statement error because the break statement exits the for loop and the successive statement cannot be executed. To address this issue, the control flow needs to be restructured and the unreachable statement removed, or moved outside the enclosing block, as shown in Fig.
Unreachable code error occurs when the code can't be compiled due to a variety of reasons, some of which include: infinite loop, return statement before the unreachable line of code.
The Unreachable statements refers to statements that won't get executed during the execution of the program are called Unreachable Statements. These statements might be unreachable because of the following reasons: Have a return statement before them. Have an infinite loop before them.
When we are keeping multiple catch blocks, the order of catch blocks must be from most specific to most general ones. i.e subclasses of Exception must come first and superclasses later. If we keep superclasses first and subclasses later, the compiler will throw an unreachable catch block error.
We don't put return statement above any other statement unless that return is under any conditional statement. If we do that then all the statements below that would never get executed (means it would become unreachable under all circumstances) which causes the error you are getting.
Do it like this
public class TabFragmentA extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RelativeLayout rootView = (RelativeLayout) inflater.inflate(R.layout.tab_layout_a, container, false);
final RadioButton r1 = (RadioButton) rootView.findViewById(R.id.radio1);
final RadioButton r2 = (RadioButton) rootView.findViewById(R.id.radio2);
final ImageView iv1 = (ImageView) rootView.findViewById(R.id.iv1);
final ImageView iv2 = (ImageView) rootView.findViewById(R.id.iv2);
iv1.setVisibility(View.INVISIBLE);
iv2.setVisibility(View.INVISIBLE);
r1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(r1.isChecked())
{
r2.setChecked(false);
iv2.setVisibility(View.INVISIBLE);
iv1.setVisibility(View.VISIBLE);
}
}
});
r2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(r2.isChecked())
{
r1.setChecked(false);
iv1.setVisibility(View.INVISIBLE);
iv2.setVisibility(View.VISIBLE);
}
}
});
return rootView;
}
}
The return statement should be at the end:
final RadioButton r1 = (RadioButton) getView().findViewById(R.id.radio1);
final RadioButton r2 = (RadioButton) getView().findViewById(R.id.radio2);
return (RelativeLayout) inflater.inflate(R.layout.tab_layout_a, container, false);
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