use namespace android::mediametrics to simplify types

Bug: 145780674
Test: atest mediametrics_tests CtsNativeMediaMetricsTestCases
diff --git a/media/libmediametrics/MediaMetrics.cpp b/media/libmediametrics/MediaMetrics.cpp
index 4aceac5..a3c2f1a 100644
--- a/media/libmediametrics/MediaMetrics.cpp
+++ b/media/libmediametrics/MediaMetrics.cpp
@@ -31,28 +31,31 @@
 // ALL functions returning a char * give responsibility for the allocated buffer
 // to the caller. The caller is responsible to call free() on that pointer.
 //
+//
+
+using namespace android::mediametrics;
 
 // manage the overall record
 mediametrics_handle_t mediametrics_create(mediametricskey_t key) {
-    android::mediametrics::Item *item = android::mediametrics::Item::create(key);
+    Item *item = Item::create(key);
     return (mediametrics_handle_t) item;
 }
 
 void mediametrics_delete(mediametrics_handle_t handle) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return;
     delete item;
 }
 
 mediametricskey_t mediametrics_getKey(mediametrics_handle_t handle) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return NULL;
     return strdup(item->getKey().c_str());
 }
 
 // nuplayer, et al use it when acting as proxies
 void mediametrics_setUid(mediametrics_handle_t handle, uid_t uid) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->setUid(uid);
 }
 
@@ -61,31 +64,31 @@
 
 void mediametrics_setInt32(mediametrics_handle_t handle, attr_t attr,
                                 int32_t value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->setInt32(attr, value);
 }
 
 void mediametrics_setInt64(mediametrics_handle_t handle, attr_t attr,
                                 int64_t value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->setInt64(attr, value);
 }
 
 void mediametrics_setDouble(mediametrics_handle_t handle, attr_t attr,
                                  double value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->setDouble(attr, value);
 }
 
 void mediametrics_setRate(mediametrics_handle_t handle, attr_t attr,
                                int64_t count, int64_t duration) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->setRate(attr, count, duration);
 }
 
 void mediametrics_setCString(mediametrics_handle_t handle, attr_t attr,
                                  const char *value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->setCString(attr, value);
 }
 
@@ -94,25 +97,25 @@
 
 void mediametrics_addInt32(mediametrics_handle_t handle, attr_t attr,
                                 int32_t value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->addInt32(attr, value);
 }
 
 void mediametrics_addInt64(mediametrics_handle_t handle, attr_t attr,
                                 int64_t value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->addInt64(attr, value);
 }
 
 void mediametrics_addDouble(mediametrics_handle_t handle, attr_t attr,
                                  double value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->addDouble(attr, value);
 }
 
 void mediametrics_addRate(mediametrics_handle_t handle, attr_t attr,
                                int64_t count, int64_t duration) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item != NULL) item->addRate(attr, count, duration);
 }
 
@@ -123,28 +126,28 @@
 
 bool mediametrics_getInt32(mediametrics_handle_t handle, attr_t attr,
                                 int32_t * value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return false;
     return item->getInt32(attr, value);
 }
 
 bool mediametrics_getInt64(mediametrics_handle_t handle, attr_t attr,
                                 int64_t * value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return false;
     return item->getInt64(attr, value);
 }
 
 bool mediametrics_getDouble(mediametrics_handle_t handle, attr_t attr,
                                  double *value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return false;
     return item->getDouble(attr, value);
 }
 
 bool mediametrics_getRate(mediametrics_handle_t handle, attr_t attr,
                                int64_t * count, int64_t * duration, double *rate) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return false;
     return item->getRate(attr, count, duration, rate);
 }
@@ -152,7 +155,7 @@
 // NB: caller owns the string that comes back, is responsible for freeing it
 bool mediametrics_getCString(mediametrics_handle_t handle, attr_t attr,
                                  char **value) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return false;
 
     return item->getCString(attr, value);
@@ -164,36 +167,36 @@
 }
 
 bool mediametrics_selfRecord(mediametrics_handle_t handle) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return false;
     return item->selfrecord();
 }
 
 mediametrics_handle_t mediametrics_dup(mediametrics_handle_t handle) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
-    if (item == NULL) return android::mediametrics::Item::convert(item);
-    return android::mediametrics::Item::convert(item->dup());
+    Item *item = (Item *) handle;
+    if (item == NULL) return Item::convert(item);
+    return Item::convert(item->dup());
 }
 
 const char *mediametrics_readable(mediametrics_handle_t handle) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return "";
     return item->toCString();
 }
 
 int32_t mediametrics_count(mediametrics_handle_t handle) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return 0;
     return item->count();
 }
 
 bool mediametrics_isEnabled() {
     // static, so doesn't need an instance
-    return android::mediametrics::Item::isEnabled();
+    return Item::isEnabled();
 }
 
 bool mediametrics_getAttributes(mediametrics_handle_t handle, char **buffer, size_t *length) {
-    android::mediametrics::Item *item = (android::mediametrics::Item *) handle;
+    Item *item = (Item *) handle;
     if (item == NULL) return false;
     return item->writeToByteString(buffer, length) == android::NO_ERROR;