android: Add facility for java code to wait native code to be ready.

Especially when unzipping rockbox.zip, the native code can be initialized
a lot later than the java code. The java code needs to be prevented from
accessing rockbox structures (e.g. current_tick, event queues) before they're
ready.

This commit adds wait_rockbox_ready() and fixes dodgy behavior of starting
rockbox via widget play button, headset remote buttons or multimedia keys.
Also fixes wrong small list items before first redraw.

Change-Id: I1caf925e829a9c1c6bb6e0016d5c80574574c91e

1 files changed, 3 insertions, 0 deletions

diff --git a/firmware/target/hosted/android/lcd-android.c b/firmware/target/hosted/android/lcd-android.c
index 4e4ea66268..15c844bbd6 100644
--- a/firmware/target/hosted/android/lcd-android.c
+++ b/firmware/target/hosted/android/lcd-android.c
@@ -122,6 +122,9 @@ Java_org_rockbox_RockboxFramebuffer_surfaceCreated(JNIEnv *env, jobject this,
     connect_with_java(env, this);
     display_on = true;
 
+    /* need to wait for button_queue to be valid to post to */
+    wait_rockbox_ready();
+
     send_event(LCD_EVENT_ACTIVATION, NULL);
     /* Force an update, since the newly created surface is initially black
      * waiting for the next normal update results in a longish black screen */