fix string npe

Author: REAndroid

src/main/java/com/reandroid/arsc/array/StringArray.java

@@ -24,6 +24,7 @@
 
 import java.util.AbstractList;
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
 
 public abstract class StringArray<T extends StringItem> extends OffsetBlockArray<T> implements JSONConvert<JSONArray> {
@@ -51,7 +52,7 @@ protected void onPostShift(int index){
     @Override
     protected void onPreRefreshRefresh(){
         if(isFlexible()){
-            trimAllocatedFreeSpace();
+            trimNullBlocks();
         }
         super.onPreRefreshRefresh();
     }
@@ -85,8 +86,10 @@ List<T> listUnusedStringsToRemove(){
     }
     public List<T> listUnusedStrings(){
         List<T> results=new ArrayList<>();
-        for(T item:listItems()){
-            if(!item.hasReference()){
+        T[] childes = getChildes();
+        for(int i = 0; i < childes.length; i++){
+            T item = childes[i];
+            if(item != null && !item.hasReference()){
                 results.add(item);
             }
         }
@@ -96,12 +99,15 @@ public void setUtf8(boolean is_utf8){
         if(mUtf8==is_utf8){
             return;
         }
-        mUtf8=is_utf8;
-        T[] childes=getChildes();
+        mUtf8 = is_utf8;
+        T[] childes = getChildes();
         if(childes!=null){
-            int max=childes.length;
-            for(int i=0;i<max;i++){
-                childes[i].setUtf8(is_utf8);
+            int length = childes.length;
+            for(int i=0; i<length; i++){
+                T item = childes[i];
+                if(item != null){
+                    item.setUtf8(is_utf8);
+                }
             }
         }
     }
@@ -124,10 +130,9 @@ public JSONArray toJson(boolean styledOnly) {
         }
         JSONArray jsonArray=new JSONArray();
         int i=0;
-        for(T item:listItems()){
-            if(item.isNull()){
-                continue;
-            }
+        Iterator<T> itr = iterator(true);
+        while (itr.hasNext()){
+            T item = itr.next();
             if(styledOnly && !item.hasStyle()){
                 continue;
             }

src/main/java/com/reandroid/arsc/base/BlockArray.java

@@ -322,6 +322,9 @@ public final T get(int i){
         }
         return elementData[i];
     }
+    public final T getLast(){
+        return get(childesCount() - mFreeSpace - 1);
+    }
     public int indexOf(Object block){
         T[] items=elementData;
         if(items==null){
@@ -354,9 +357,11 @@ public Iterator<T> iterator() {
         return iterator(false);
     }
     public Iterator<T> iterator(boolean skipNullBlock) {
+        trimAllocatedFreeSpace();
         return new BlockIterator(skipNullBlock);
     }
     public Iterator<T> iterator(Predicate<T> tester) {
+        trimAllocatedFreeSpace();
         return new PredicateIterator(tester);
     }
     public boolean contains(Object block){
@@ -457,6 +462,8 @@ private int countNonNull(boolean is_null_check){
         return result;
     }
     private void changeSize(int amount){
+        mFreeSpace = 0;
+        mAllocateStep = 0;
         T[] old=elementData;
         int index=old.length;
         int size=index+amount;

src/main/java/com/reandroid/arsc/pool/StringPool.java

@@ -251,6 +251,9 @@ public boolean contains(String str){
     public final T get(int index){
         return mArrayStrings.get(index);
     }
+    public final T getLast(){
+        return mArrayStrings.getLast();
+    }
     public final StringGroup<T> get(String str){
         return mUniqueMap.get(str);
     }