Errors after building apk

Question

Action bar views (share action provider and searchview) crashes after generating signed apk. When i debug app from android studio it's working but when i generating signed apk and install app to device i getting errors like this :

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.SearchView.setQueryHint(java.lang.CharSequence)' on a null object reference
            at tm.veriloft.ertir.ui.SearchActivity.onCreateOptionsMenu(Unknown Source)
            at android.app.Activity.onCreatePanelMenu(Activity.java:2820)
            at android.support.v4.app.o.onCreatePanelMenu(Unknown Source)
            at android.support.v7.app.e.a(Unknown Source)
            at android.support.v7.app.g.a(Unknown Source)
            at android.support.v7.widget.as.a(Unknown Source)
            at android.support.v7.internal.a.a.j(Unknown Source)
            at android.support.v7.internal.a.b.run(Unknown Source)
            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)

or

 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.ah.a(android.content.Intent)' on a null object reference
            at tm.veriloft.ertir.ui.BlogViewActivity.onCreateOptionsMenu(Unknown Source)
            at android.app.Activity.onCreatePanelMenu(Activity.java:2820)
            at android.support.v4.app.o.onCreatePanelMenu(Unknown Source)
            at android.support.v7.app.e.a(Unknown Source)
            at android.support.v7.app.g.a(Unknown Source)
            at android.support.v7.widget.as.a(Unknown Source)
            at android.support.v7.internal.a.a.j(Unknown Source)
            at android.support.v7.internal.a.b.run(Unknown Source)
            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)

I'm using last versions of support libraries and toolbar. (by setting setSupportActionBar(mToolbar)).

SearchView xml :

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ertir="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_search"
        android:title="@string/title_activity_search"
        ertir:showAsAction="always"
        ertir:actionViewClass="android.support.v7.widget.SearchView" />
</menu>

Java

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.search, menu);
        MenuItem searchItem = menu.findItem(R.id.action_search);
        mSearchView = (SearchView) searchItem.getActionView();
        mSearchView.setQueryHint(getString(R.string.search_hint));
        mSearchView.setFocusable(true);
        mSearchView.setIconified(false);
        mSearchView.requestFocusFromTouch();
        mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                mSearchView.clearFocus(); //Hide keyboard
                search(query, searchTypeArray.get(searchTypeSpinner.getSelectedItemPosition()).getType());
                return false;
            }

            @Override
            public boolean onQueryTextChange(String query) {
                if (searchTypeArray.get(searchTypeSpinner.getSelectedItemPosition()).getType().equals("blogs"))
                    searchAfter(1100, query, searchTypeArray.get(searchTypeSpinner.getSelectedItemPosition()).getType());
                else
                    search(query, searchTypeArray.get(searchTypeSpinner.getSelectedItemPosition()).getType());
                return false;
            }
        });
        return true;
    }

How can i fix this? Like is said above, i get errors only after signing apk.

Answer 1

In proguard-rules.pro, add the following line to exclude the SearchView class: '-keep class android.support.v7.widget.** { *; }' and then create the build. I resolved it like this.

Answer 2

It happens because you have not configured your progaurd appropiately. In you build.gradle under buildTypes and 'release' change runProguard true to runProguard false and generate the singed APK and test. If it works well, try learning to configure progaurd appropriately :)