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Add a bit of resilience at class initialization

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This commit is contained in:
Xavi Artigas 2012-09-18 12:36:17 +02:00
parent 2048b11b90
commit c763636b97
2 changed files with 8 additions and 3 deletions
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9
gst-sdk/tutorials/android-tutorial-1/jni/tutorial-1.c
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@ -264,13 +264,18 @@ void gst_native_set_position (JNIEnv* env, jobject thiz, int milliseconds) {
} }
} }
void gst_class_init (JNIEnv* env, jclass klass) { jboolean gst_class_init (JNIEnv* env, jclass klass) {
custom_data_field_id = (*env)->GetFieldID (env, klass, "native_custom_data", "J"); custom_data_field_id = (*env)->GetFieldID (env, klass, "native_custom_data", "J");
GST_DEBUG ("The FieldID for the native_custom_data field is %p", custom_data_field_id); GST_DEBUG ("The FieldID for the native_custom_data field is %p", custom_data_field_id);
set_message_method_id = (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V"); set_message_method_id = (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V");
GST_DEBUG ("The MethodID for the setMessage method is %p", set_message_method_id); GST_DEBUG ("The MethodID for the setMessage method is %p", set_message_method_id);
set_current_position_method_id = (*env)->GetMethodID (env, klass, "setCurrentPosition", "(II)V"); set_current_position_method_id = (*env)->GetMethodID (env, klass, "setCurrentPosition", "(II)V");
GST_DEBUG ("The MethodID for the setCurrentPosition method is %p", set_current_position_method_id); GST_DEBUG ("The MethodID for the setCurrentPosition method is %p", set_current_position_method_id);
if (!custom_data_field_id || !set_message_method_id || !set_current_position_method_id) {
GST_ERROR ("The calling class does not implement all necessary interface methods");
return JNI_FALSE;
}
return JNI_TRUE;
} }
void gst_native_surface_init (JNIEnv *env, jobject thiz, jobject surface) { void gst_native_surface_init (JNIEnv *env, jobject thiz, jobject surface) {
@ -305,7 +310,7 @@ static JNINativeMethod native_methods[] = {
{ "nativePlay", "()V", (void *) gst_native_play}, { "nativePlay", "()V", (void *) gst_native_play},
{ "nativePause", "()V", (void *) gst_native_pause}, { "nativePause", "()V", (void *) gst_native_pause},
{ "nativeSetPosition", "(I)V", (void*) gst_native_set_position}, { "nativeSetPosition", "(I)V", (void*) gst_native_set_position},
{ "classInit", "()V", (void *) gst_class_init}, { "classInit", "()Z", (void *) gst_class_init},
{ "nativeSurfaceInit", "(Ljava/lang/Object;)V", (void *) gst_native_surface_init}, { "nativeSurfaceInit", "(Ljava/lang/Object;)V", (void *) gst_native_surface_init},
{ "nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize} { "nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize}
}; };

2
gst-sdk/tutorials/android-tutorial-1/src/com/gst_sdk_tutorials/tutorial_1/Tutorial1.java
View file

@ -37,7 +37,7 @@ public class Tutorial1 extends Activity implements SurfaceHolder.Callback, OnSee
private native void nativePlay(); private native void nativePlay();
private native void nativePause(); private native void nativePause();
private native void nativeSetPosition(int milliseconds); private native void nativeSetPosition(int milliseconds);
private static native void classInit(); private static native boolean classInit();
private native void nativeSurfaceInit(Object surface); private native void nativeSurfaceInit(Object surface);
private native void nativeSurfaceFinalize(); private native void nativeSurfaceFinalize();
private long native_custom_data; private long native_custom_data;