Add saving crash log

app/src/main/java/com/hippo/ehviewer/AppConfig.java

@@ -38,6 +38,7 @@ public class AppConfig {
     private static final String PARSE_ERROR = "parse_error";
     private static final String LOGCAT = "logcat";
     private static final String DATA = "data";
+    private static final String CRASH = "crash";
 
     private static Context sContext;
 
@@ -107,6 +108,11 @@ public class AppConfig {
         return getDirInExternalAppDir(DATA);
     }
 
+    @Nullable
+    public static File getExternalCrashDir() {
+        return getDirInExternalAppDir(CRASH);
+    }
+
     @Nullable
     public static File createExternalTempFile() {
         return FileUtils.createTempFile(getExternalTempDir(), null);