我正在尝试使用 android/SDL c++ 代码调用 java 方法来弹出或更新 Toast。 但我得到了
W/dalvikvm( 4026): Invalid indirect reference 0x41e6b710 in decodeIndirectRef
Toast 在从 Java 端更新时似乎可以工作(例如,从常规调用的处理程序更新),并且我的消息字符串将 Log() 正常,但是一旦在 setText() 中设置了任何东西(甚至是"Hello World"),我就会崩溃。
我的 main.cc(参考 https://wiki.libsdl.org/SDL_AndroidGetJNIEnv)
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "SDL.h"
#include <android/log.h>
#include <jni.h>
#define log(...) __android_log_print(ANDROID_LOG_INFO, "SDL/c", __VA_ARGS__);
void progressMessage(const char *message)
{
log("0) '%s'", message);
JNIEnv *jni_env = (JNIEnv*)SDL_AndroidGetJNIEnv();
log("1) env %08x", (unsigned int)jni_env);
jobject jni_activity = (jobject)SDL_AndroidGetActivity();
log("2) act %08x", (unsigned int)jni_activity);
jclass jni_class(jni_env->GetObjectClass(jni_activity));
log("3) cls %08x", (unsigned int)jni_class);
jstring jstr = jni_env->NewStringUTF(message);
log("4) str %08x", (unsigned int)jstr);
jmethodID method = jni_env->GetMethodID(jni_class,
"progressMessage", "(Ljava/lang/String;)V ");
log("5) met %08x", (unsigned int)method);
jni_env->CallVoidMethod(jni_activity, method, jstr);
log("6) done");
jni_env->DeleteLocalRef(jni_activity);
jni_env->DeleteLocalRef(jni_class);
}
int main(int argc, char *argv[])
{
SDL_Window *window;
SDL_Renderer *renderer;
if(SDL_CreateWindowAndRenderer(0, 0, 0, &window, &renderer) < 0)
exit(2);
Uint8 done = 0;
SDL_Event event;
int loop = 0;
while(!done)
{
if (loop % 100 == 0)
{
char message[256];
sprintf(message, "Log %d", loop);
progressMessage(message);
}
while(SDL_PollEvent(&event))
{
if(event.type == SDL_QUIT || event.type == SDL_KEYDOWN || event.type == SDL_FINGERDOWN)
{
done = 1;
}
}
int col = loop % 512;
if (col > 255)
col = 256-col;
SDL_SetRenderDrawColor(renderer, col,col,col, 0xFF);
SDL_RenderClear(renderer);
SDL_RenderPresent(renderer);
SDL_Delay(10);
loop++;
}
exit(0);
}
我的班级
package com.example.test;
import android.util.Log;
import android.widget.Toast;
import android.os.Bundle;
import org.libsdl.app.SDLActivity;
public class SDLTest extends SDLActivity {
public static Toast toast = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
toast = Toast.makeText(this, "", Toast.LENGTH_SHORT);
this.progressMessage("Starting");
}
public void progressMessage(String message) {
Log.i("SDL/java", message);
toast.setText(message);
toast.setDuration(Toast.LENGTH_SHORT);
toast.show();
}
}
这是日志猫输出
I/SDL ( 4561): SDL_Android_Init()
I/SDL ( 4561): SDL_Android_Init() finished!
I/SDL/c ( 4561): 0) 'Log 0'
I/SDL/c ( 4561): 1) env 76160ec8
I/SDL/c ( 4561): 2) act 2d900009
I/SDL/c ( 4561): 3) cls 1dd00011
I/SDL/c ( 4561): 4) str 1d200015
I/SDL/c ( 4561): 5) met 6d788688
I/SDL/java( 4561): Log 0
I/SDL/c ( 4561): 6) done
I/ActivityManager( 594): Displayed com.example.test/.SDLTest: +218ms
V/SDL ( 4561): onWindowFocusChanged(): true
I/SDL/c ( 4561): 0) 'Log 100'
I/SDL/c ( 4561): 1) env 76160ec8
I/SDL/c ( 4561): 2) act 1de00011
I/SDL/c ( 4561): 3) cls 2da00009
I/SDL/c ( 4561): 4) str 1dc00019
I/SDL/c ( 4561): 5) met 6d788688
I/SDL/java( 4561): Log 100
I/SDL/c ( 4561): 6) done
I/SDL/c ( 4561): 0) 'Log 200'
I/SDL/c ( 4561): 1) env 76160ec8
I/SDL/c ( 4561): 2) act 41e64a80
W/dalvikvm( 4561): Invalid indirect reference 0x41e64a80 in decodeIndirectRef
I/dalvikvm( 4561): "SDLThread" prio=5 tid=11 RUNNABLE
I/dalvikvm( 4561): | group="main" sCount=0 dsCount=0 obj=0x41e75fd0 self=0x761607a0
I/dalvikvm( 4561): | sysTid=4579 nice=0 sched=0/0 cgrp=apps handle=1981156344
I/dalvikvm( 4561): | state=R schedstat=( 0 0 0 ) utm=3 stm=11 core=1
I/dalvikvm( 4561): at org.libsdl.app.SDLActivity.nativeInit(Native Method)
I/dalvikvm( 4561): at org.libsdl.app.SDLMain.run(SDLActivity.java:915)
I/dalvikvm( 4561): at java.lang.Thread.run(Thread.java:841)
I/dalvikvm( 4561):
E/dalvikvm( 4561): VM aborting
"活动"指针似乎已损坏。
(我也希望 env、活动、类和方法都可以缓存)
我错过了什么?
这是一个线程问题。
SDL 在单独的线程中启动 SDLMain(),因此调用这些 Java 方法有问题!
理想的解决方案是在某些非线程模式下运行 SDL,如此处所述 http://theorangeduck.com/page/issues-sdl-ios-and-android
但是我已经通过在SDLActivity中公开send命令解决了我的直接问题
public boolean sendCommand(int command, Object data)
并实现一个可以由
public void progressMessage(String message) {
toast.setText(message);
toast.setDuration(Toast.LENGTH_LONG);
toast.show();
}
public static boolean sendCommand(int command, String string) {
return SDLActivity.mSingleton.sendCommand(command, string);
}
@Override
protected boolean onUnhandledMessage(int command, Object param) {
boolean ok = true;
switch (command) {
case COMMAND_USER_PROGRESS:
progressMessage((String)param);
break;
default:
ok = false;
break;
}
return ok;
}