Android: use NewGlobalRef for references that are used globally

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29568 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 43 insertions, 12 deletions

diff --git a/firmware/target/hosted/android/lcd-android.c b/firmware/target/hosted/android/lcd-android.c
index 0cde160e65..08a4075795 100644
--- a/firmware/target/hosted/android/lcd-android.c
+++ b/firmware/target/hosted/android/lcd-android.c
@@ -47,8 +47,16 @@ static bool display_on;
 void connect_with_java(JNIEnv* env, jobject fb_instance)
 {
     JNIEnv e = *env;
-    static bool have_class;
-    RockboxFramebuffer_instance = fb_instance;
+
+    /* Update RockboxFramebuffer_instance */
+    if (!e->IsSameObject(env, RockboxFramebuffer_instance, fb_instance)) {
+        if (RockboxFramebuffer_instance != NULL)
+            e->DeleteGlobalRef(env, RockboxFramebuffer_instance);
+
+        RockboxFramebuffer_instance = e->NewGlobalRef(env, fb_instance);
+    }
+
+    static bool have_class = false;
     if (!have_class)
     {
         jclass fb_class = e->GetObjectClass(env, fb_instance);
@@ -70,10 +78,13 @@ void connect_with_java(JNIEnv* env, jobject fb_instance)
         java_lcd_init        = e->GetMethodID(env, fb_class,
                                              "java_lcd_init",
                                              "(IILjava/nio/ByteBuffer;)V");
-                                               
-        native_buffer        = e->NewDirectByteBuffer(env,
+
+        jobject buffer       = e->NewDirectByteBuffer(env,
                                                   lcd_framebuffer,
                                                   (jlong)sizeof(lcd_framebuffer));
+
+        native_buffer        = e->NewGlobalRef(env, buffer);
+
         have_class           = true;
     }
     /* we need to setup parts for the java object every time */
@@ -81,6 +92,12 @@ void connect_with_java(JNIEnv* env, jobject fb_instance)
                           (jint)LCD_WIDTH, (jint)LCD_HEIGHT, native_buffer);
 }
 
+void lcd_deinit(void)
+{
+    (*env_ptr)->DeleteGlobalRef(env_ptr, RockboxFramebuffer_instance);
+    (*env_ptr)->DeleteGlobalRef(env_ptr, native_buffer);
+}
+
 /*
  * Do nothing here and connect with the java object later (if it isn't already)
  */
diff --git a/firmware/target/hosted/android/pcm-android.c b/firmware/target/hosted/android/pcm-android.c
index c8bc410a54..f4ed4b1b33 100644
--- a/firmware/target/hosted/android/pcm-android.c
+++ b/firmware/target/hosted/android/pcm-android.c
@@ -35,7 +35,6 @@ static char   *pcm_data_start;
 static jmethodID play_pause_method;
 static jmethodID stop_method;
 static jmethodID set_volume_method;
-static jclass    RockboxPCM_class;
 static jobject   RockboxPCM_instance;
 
 
@@ -155,10 +154,11 @@ void pcm_play_dma_init(void)
      **/
     JNIEnv e = *env_ptr;
     /* get the class and its constructor */
-    RockboxPCM_class = e->FindClass(env_ptr, "org/rockbox/RockboxPCM");
+    jclass RockboxPCM_class = e->FindClass(env_ptr, "org/rockbox/RockboxPCM");
     jmethodID constructor = e->GetMethodID(env_ptr, RockboxPCM_class, "<init>", "()V");
     /* instance = new RockboxPCM() */
-    RockboxPCM_instance = e->NewObject(env_ptr, RockboxPCM_class, constructor);
+    jobject PCM_instance = e->NewObject(env_ptr, RockboxPCM_class, constructor);
+    RockboxPCM_instance = e->NewGlobalRef(env_ptr, PCM_instance);
     /* cache needed methods */
     play_pause_method = e->GetMethodID(env_ptr, RockboxPCM_class, "play_pause", "(Z)V");
     set_volume_method = e->GetMethodID(env_ptr, RockboxPCM_class, "set_volume", "(I)V");
@@ -167,6 +167,11 @@ void pcm_play_dma_init(void)
     pcm_play_get_more_callback((void*)&pcm_data_start, &pcm_data_size);
 }
 
+void pcm_deinit(void)
+{
+    (*env_ptr)->DeleteGlobalRef(env_ptr, RockboxPCM_instance);
+}
+
 void pcm_postinit(void)
 {
 }
diff --git a/firmware/target/hosted/android/system-android.c b/firmware/target/hosted/android/system-android.c
index 92c2d7cf5d..66de4e0ebb 100644
--- a/firmware/target/hosted/android/system-android.c
+++ b/firmware/target/hosted/android/system-android.c
@@ -36,10 +36,18 @@ uintptr_t *stackend;
 
 extern int main(void);
 extern void telephony_init_device(void);
+extern void lcd_deinit(void);
+extern void pcm_deinit(void);
 
 void system_exception_wait(void) { }
 void system_reboot(void) { }
-void power_off(void) { }
+
+void power_off(void)
+{
+    lcd_deinit();
+    pcm_deinit();
+    (*env_ptr)->DeleteGlobalRef(env_ptr, RockboxService_class);
+}
 
 void system_init(void)
 {
@@ -51,18 +59,19 @@ void system_init(void)
 JNIEXPORT void JNICALL
 Java_org_rockbox_RockboxService_main(JNIEnv *env, jobject this)
 {
+    jclass class = (*env)->GetObjectClass(env, this);
+
     /* hack!!! we can't have a valid stack pointer otherwise.
      * but we don't really need it anyway, thread.c only needs it
      * for overflow detection which doesn't apply for the main thread
      * (it's managed by the OS) */
 
-    (void)env;
-    (void)this;
     volatile uintptr_t stack = 0;
     stackbegin = stackend = (uintptr_t*) &stack;
     env_ptr = env;
-    RockboxService_instance = this;
-    RockboxService_class = (*env)->GetObjectClass(env, this);
+
+    RockboxService_instance = (*env)->NewGlobalRef(env, this);
+    RockboxService_class = (*env)->NewGlobalRef(env, class);
 
     main();
 }