Use Executor thread pool instead of creating my own threads on the fly

app/src/main/java/acr/browser/lightning/activity/BrowserActivity.java

@@ -328,14 +328,14 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
         mSearch.setOnEditorActionListener(search);
         mSearch.setOnTouchListener(search);
 
-        new Thread(new Runnable() {
+        BrowserApp.getTaskThread().execute(new Runnable() {
 
             @Override
             public void run() {
                 initializeSearchSuggestions(mSearch);
             }
 
-        }).run();
+        });
 
         mDrawerLayout.setDrawerShadow(R.drawable.drawer_right_shadow, GravityCompat.END);
         mDrawerLayout.setDrawerShadow(R.drawable.drawer_left_shadow, GravityCompat.START);
@@ -1480,42 +1480,49 @@ public abstract class BrowserActivity extends ThemableBrowserActivity implements
      * previously searched URLs
      */
     private void initializeSearchSuggestions(final AutoCompleteTextView getUrl) {
-        getUrl.setThreshold(1);
-        getUrl.setDropDownWidth(-1);
-        getUrl.setDropDownAnchor(R.id.toolbar_layout);
-        getUrl.setOnItemClickListener(new OnItemClickListener() {
 
-            @Override
-            public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
-                String url = null;
-                CharSequence urlString = ((TextView) view.findViewById(R.id.url)).getText();
-                if (urlString != null) {
-                    url = urlString.toString();
-                }
-                if (url == null || url.startsWith(BrowserActivity.this.getString(R.string.suggestion))) {
-                    CharSequence searchString = ((TextView) view.findViewById(R.id.title)).getText();
-                    if (searchString != null) {
-                        url = searchString.toString();
-                    }
-                }
-                if (url == null) {
-                    return;
-                }
-                getUrl.setText(url);
-                searchTheWeb(url);
-                InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
-                imm.hideSoftInputFromWindow(getUrl.getWindowToken(), 0);
-                final LightningView currentTab = mTabsManager.getCurrentTab();
-                if (currentTab != null) {
-                    currentTab.requestFocus();
-                }
-            }
-
-        });
-
-        getUrl.setSelectAllOnFocus(true);
         mSearchAdapter = new SearchAdapter(this, mDarkTheme, isIncognito());
-        getUrl.setAdapter(mSearchAdapter);
+
+        getUrl.post(new Runnable() {
+            @Override
+            public void run() {
+                getUrl.setThreshold(1);
+                getUrl.setDropDownWidth(-1);
+                getUrl.setDropDownAnchor(R.id.toolbar_layout);
+                getUrl.setOnItemClickListener(new OnItemClickListener() {
+
+                    @Override
+                    public void onItemClick(AdapterView<?> adapterView, View view, int pos, long l) {
+                        String url = null;
+                        CharSequence urlString = ((TextView) view.findViewById(R.id.url)).getText();
+                        if (urlString != null) {
+                            url = urlString.toString();
+                        }
+                        if (url == null || url.startsWith(BrowserActivity.this.getString(R.string.suggestion))) {
+                            CharSequence searchString = ((TextView) view.findViewById(R.id.title)).getText();
+                            if (searchString != null) {
+                                url = searchString.toString();
+                            }
+                        }
+                        if (url == null) {
+                            return;
+                        }
+                        getUrl.setText(url);
+                        searchTheWeb(url);
+                        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
+                        imm.hideSoftInputFromWindow(getUrl.getWindowToken(), 0);
+                        final LightningView currentTab = mTabsManager.getCurrentTab();
+                        if (currentTab != null) {
+                            currentTab.requestFocus();
+                        }
+                    }
+
+                });
+
+                getUrl.setSelectAllOnFocus(true);
+                getUrl.setAdapter(mSearchAdapter);
+            }
+        });
     }
 
     /**

app/src/main/java/acr/browser/lightning/app/BrowserApp.java

@@ -16,6 +16,7 @@ public class BrowserApp extends Application {
 
     private static AppComponent mAppComponent;
     private static final Executor mIOThread = Executors.newSingleThreadExecutor();
+    private static final Executor mTaskThread = Executors.newCachedThreadPool();
 
     @Inject Bus mBus;
 
@@ -41,6 +42,11 @@ public class BrowserApp extends Application {
         return mIOThread;
     }
 
+    @NonNull
+    public static Executor getTaskThread() {
+        return mTaskThread;
+    }
+
     public static Bus getBus(@NonNull Context context) {
         return get(context).mBus;
     }

app/src/main/java/acr/browser/lightning/download/DownloadHandler.java

@@ -228,7 +228,7 @@ public class DownloadHandler {
         } else {
             final DownloadManager manager = (DownloadManager) context
                     .getSystemService(Context.DOWNLOAD_SERVICE);
-            new Thread() {
+            BrowserApp.getTaskThread().execute(new Runnable() {
                 @Override
                 public void run() {
                     try {
@@ -243,7 +243,7 @@ public class DownloadHandler {
                         eventBus.post(new BrowserEvents.ShowSnackBarMessage(R.string.problem_location_download));
                     }
                 }
-            }.start();
+            });
             eventBus.post(new BrowserEvents.ShowSnackBarMessage(
                     context.getString(R.string.download_pending) + ' ' + filename));
         }

app/src/main/java/acr/browser/lightning/fragment/BookmarkSettingsFragment.java

@@ -137,7 +137,7 @@ public class BookmarkSettingsFragment extends PreferenceFragment implements Pref
         exportpref.setOnPreferenceClickListener(this);
         importpref.setOnPreferenceClickListener(this);
 
-        new Thread(mInitializeImportPreference).start();
+        BrowserApp.getTaskThread().execute(mInitializeImportPreference);
     }
 
     private final Runnable mInitializeImportPreference = new Runnable() {

app/src/main/java/acr/browser/lightning/fragment/BookmarksFragment.java

@@ -170,7 +170,7 @@ public class BookmarksFragment extends Fragment implements View.OnClickListener,
         setupNavigationButton(view, R.id.action_toggle_desktop, R.id.icon_desktop);
 
         // Must be called here, only here we have a reference to the ListView
-        new Thread(mInitBookmarkManager).run();
+        BrowserApp.getTaskThread().execute(mInitBookmarkManager);
         return view;
     }
 

app/src/main/java/acr/browser/lightning/fragment/PrivacySettingsFragment.java

@@ -175,13 +175,12 @@ public class PrivacySettingsFragment extends LightningPreferenceFragment impleme
                         new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface arg0, int arg1) {
-                                Thread clear = new Thread(new Runnable() {
+                                BrowserApp.getTaskThread().execute(new Runnable() {
                                     @Override
                                     public void run() {
                                         clearCookies();
                                     }
                                 });
-                                clear.start();
                             }
                         })
                 .setNegativeButton(getResources().getString(R.string.action_no), null).show();

app/src/main/java/acr/browser/lightning/object/SearchAdapter.java

@@ -96,12 +96,10 @@ public class SearchAdapter extends BaseAdapter implements Filterable {
         mSearchSubtitle = mContext.getString(R.string.suggestion);
         mDarkTheme = dark || incognito;
         mIncognito = incognito;
-        Thread delete = new Thread(new ClearCacheRunnable(BrowserApp.get(context)));
+        BrowserApp.getTaskThread().execute(new ClearCacheRunnable(BrowserApp.get(context)));
         mSearchDrawable = ThemeUtils.getThemedDrawable(context, R.drawable.ic_search, mDarkTheme);
         mBookmarkDrawable = ThemeUtils.getThemedDrawable(context, R.drawable.ic_bookmark, mDarkTheme);
         mHistoryDrawable = ThemeUtils.getThemedDrawable(context, R.drawable.ic_history, mDarkTheme);
-        delete.setPriority(Thread.MIN_PRIORITY);
-        delete.start();
         mLanguage = Locale.getDefault().getLanguage();
         if (mLanguage.isEmpty()) {
             mLanguage = DEFAULT_LANGUAGE;

app/src/main/java/acr/browser/lightning/utils/AdBlock.java

@@ -55,7 +55,7 @@ public class AdBlock {
     }
 
     private void loadBlockedDomainsList(@NonNull final Context context) {
-        Thread thread = new Thread(new Runnable() {
+        BrowserApp.getTaskThread().execute(new Runnable() {
 
             @Override
             public void run() {
@@ -77,7 +77,6 @@ public class AdBlock {
                 }
             }
         });
-        thread.start();
     }
 
     /**
@@ -140,7 +139,7 @@ public class AdBlock {
      * @param context the context needed to read the file
      */
     private void loadHostsFile(@NonNull final Context context) {
-        Thread thread = new Thread(new Runnable() {
+        BrowserApp.getTaskThread().execute(new Runnable() {
 
             @Override
             public void run() {
@@ -181,6 +180,5 @@ public class AdBlock {
                 }
             }
         });
-        thread.start();
     }
 }