Add support for deleting crashes in database.

sherlock/src/main/java/com/singhajit/sherlock/core/Sherlock.java

@@ -54,10 +54,12 @@ public static Sherlock getInstance() {
     return instance;
   }
 
-  public List<Crash> getAllCrashes() {
+  public static List<Crash> getAllCrashes() {
     return getInstance().database.getCrashes();
   }
 
+  public static void clearAllCrashes() { getInstance().database.clearCrashes(); }
+
   private static void analyzeAndReportCrash(Throwable throwable) {
     Log.d(TAG, "Analyzing Crash...");
     CrashAnalyzer crashAnalyzer = new CrashAnalyzer(throwable);

sherlock/src/main/java/com/singhajit/sherlock/core/database/CrashTable.java

@@ -19,6 +19,7 @@ public class CrashTable implements BaseColumns {
   public static final String DROP_QUERY = "drop table " + TABLE_NAME;
   public static final String TRUNCATE_QUERY = "delete from " + TABLE_NAME;
   public static final String SELECT_ALL = "SELECT * FROM " + TABLE_NAME + " ORDER BY " + _ID + " DESC";
+  public static final String DELETE_ALL = "DELETE FROM " + TABLE_NAME;
 
   public static String selectById(int id) {
     return "SELECT * FROM " + TABLE_NAME + " WHERE " + _ID + " = " + id;

sherlock/src/main/java/com/singhajit/sherlock/core/database/SherlockDatabaseHelper.java

@@ -61,6 +61,10 @@ public List<Crash> getCrashes() {
     return crashes;
   }
 
+  public void clearCrashes() {
+    getWritableDatabase().execSQL(CrashTable.DELETE_ALL);
+  }
+
   public Crash getCrashById(int id) {
     SQLiteDatabase readableDatabase = getReadableDatabase();
     Cursor cursor = readableDatabase.rawQuery(CrashTable.selectById(id), null);

sherlock/src/main/java/com/singhajit/sherlock/crashes/activity/CrashListActivity.java

@@ -9,6 +9,7 @@
 import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuItem;
+import android.widget.CheckBox;
 import android.widget.LinearLayout;
 
 import com.singhajit.sherlock.R;
@@ -18,15 +19,22 @@
 import com.singhajit.sherlock.crashes.presenter.CrashListPresenter;
 import com.singhajit.sherlock.crashes.viewmodel.CrashesViewModel;
 
-public class CrashListActivity extends BaseActivity implements CrashListActions {
+import static com.singhajit.sherlock.crashes.activity.CrashActivity.CRASH_ID;
+
 
+public class CrashListActivity extends BaseActivity implements CrashListActions {
+  public static final String CLEAR_CRASHES = "com.singhajit.sherlock.CLEAR_CRASHES";
   private CrashListPresenter presenter;
 
   @Override
   protected void onCreate(@Nullable Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.crash_list_activity);
 
+    Intent intent = getIntent();
+    boolean clearCrashes = intent.getBooleanExtra(CLEAR_CRASHES, false);
+    ((CheckBox) findViewById(R.id.erase_crashes)).setChecked(clearCrashes);
+
     enableHomeButton((Toolbar) findViewById(R.id.toolbar));
     setTitle(R.string.app_name);
 
@@ -35,6 +43,18 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
     presenter.render(database);
   }
 
+  @Override
+  protected void onDestroy()
+  {
+    CheckBox eraseAll = (CheckBox) findViewById(R.id.erase_crashes);
+    if (eraseAll != null && eraseAll.isChecked())
+    {
+      SherlockDatabaseHelper dbHelper = new SherlockDatabaseHelper(this);
+      dbHelper.clearCrashes();
+    }
+    super.onDestroy();
+  }
+
   @Override
   public void render(CrashesViewModel viewModel) {
     RecyclerView crashList = (RecyclerView) findViewById(R.id.crash_list);
@@ -66,7 +86,7 @@ public boolean onOptionsItemSelected(MenuItem item) {
   @Override
   public void openCrashDetails(int crashId) {
     Intent intent = new Intent(this, CrashActivity.class);
-    intent.putExtra(CrashActivity.CRASH_ID, crashId);
+    intent.putExtra(CRASH_ID, crashId);
 
     startActivity(intent);
   }

sherlock/src/main/res/layout/crash_list_activity.xml

@@ -6,6 +6,7 @@
   android:layout_height="match_parent"
   android:orientation="vertical">
 
+
   <android.support.design.widget.AppBarLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
@@ -22,6 +23,13 @@
     </android.support.v7.widget.Toolbar>
   </android.support.design.widget.AppBarLayout>
 
+  <CheckBox
+      android:id="@+id/erase_crashes"
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:checked="true"
+      android:text="@string/erase_all_crashes" />
+
   <LinearLayout
     android:id="@+id/no_crash_found_layout"
     android:layout_width="match_parent"
@@ -56,5 +64,8 @@
     android:layout_marginEnd="5dp"
     android:layout_marginStart="5dp"
     android:layout_marginTop="10dp"
-    android:scrollbars="vertical"/>
+    android:scrollbars="vertical">
+
+  </android.support.v7.widget.RecyclerView>
+
 </LinearLayout>

sherlock/src/main/res/values/strings.xml

@@ -12,4 +12,5 @@
   <string name="version">Version</string>
   <string name="not_found">404</string>
   <string name="github_link">https://github.com/ajitsing/Sherlock</string>
+  <string name="erase_all_crashes">Clear all crashes upon leaving</string>
 </resources>