Add null check for activity

app/src/main/java/com/fongmi/android/tv/player/extractor/Push.java

@@ -15,7 +15,7 @@ public class Push implements Source.Extractor {
 
     @Override
     public String fetch(String url) throws Exception {
-        VideoActivity.start(App.activity(), url.substring(7));
+        if (App.activity() != null) VideoActivity.start(App.activity(), url.substring(7));
         SystemClock.sleep(500);
         return "";
     }

app/src/main/java/com/fongmi/android/tv/ui/custom/CustomWebView.java

@@ -140,7 +140,7 @@ public class CustomWebView extends WebView {
     }
 
     private void showDialog() {
-        if (dialog != null) return;
+        if (dialog != null || App.activity() == null) return;
         if (getParent() != null) ((ViewGroup) getParent()).removeView(this);
         dialog = new AlertDialog.Builder(App.activity()).setView(this).show();
     }

app/src/mobile/java/com/fongmi/android/tv/Updater.java

@@ -69,21 +69,21 @@ public class Updater implements Download.Callback {
         return this;
     }
 
-    public void start() {
-        App.execute(this::doInBackground);
+    public void start(Activity activity) {
+        App.execute(() -> doInBackground(activity));
     }
 
     private boolean need(int code, String name) {
         return Setting.getUpdate() && (dev ? !name.equals(BuildConfig.VERSION_NAME) && code >= BuildConfig.VERSION_CODE : code > BuildConfig.VERSION_CODE);
     }
 
-    private void doInBackground() {
+    private void doInBackground(Activity activity) {
         try {
             JSONObject object = new JSONObject(OkHttp.string(getJson()));
             String name = object.optString("name");
             String desc = object.optString("desc");
             int code = object.optInt("code");
-            if (need(code, name)) App.post(() -> show(App.activity(), name, desc));
+            if (need(code, name)) App.post(() -> show(activity, name, desc));
         } catch (Exception e) {
             e.printStackTrace();
         }

app/src/mobile/java/com/fongmi/android/tv/ui/activity/MainActivity.java

@@ -64,8 +64,8 @@ public class MainActivity extends BaseActivity implements NavigationBarView.OnIt
 
     @Override
     protected void initView(Bundle savedInstanceState) {
+        Updater.get().release().start(this);
         initFragment(savedInstanceState);
-        Updater.get().release().start();
         Server.get().start();
         initConfig();
     }

app/src/mobile/java/com/fongmi/android/tv/ui/dialog/LinkDialog.java

@@ -9,7 +9,6 @@ import android.view.inputmethod.EditorInfo;
 import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.Fragment;
 
-import com.fongmi.android.tv.App;
 import com.fongmi.android.tv.R;
 import com.fongmi.android.tv.databinding.DialogLinkBinding;
 import com.fongmi.android.tv.ui.activity.VideoActivity;
@@ -65,7 +64,7 @@ public class LinkDialog {
 
     private void onPositive(DialogInterface dialog, int which) {
         String text = binding.text.getText().toString().trim();
-        if (!text.isEmpty()) VideoActivity.start(App.activity(), text);
+        if (!text.isEmpty()) VideoActivity.start(fragment.getActivity(), text);
         dialog.dismiss();
     }
 

app/src/mobile/java/com/fongmi/android/tv/ui/fragment/SettingFragment.java

@@ -259,11 +259,11 @@ public class SettingFragment extends BaseFragment implements ConfigCallback, Sit
     }
 
     private void onVersion(View view) {
-        Updater.get().force().release().start();
+        Updater.get().force().release().start(getActivity());
     }
 
     private boolean onVersionDev(View view) {
-        Updater.get().force().dev().start();
+        Updater.get().force().dev().start(getActivity());
         return true;
     }