android NDK for android應用程序。我被困在起跑線上,並沒有進一步編譯。以下是我的代碼。它不會在「str =(* env) - > GetStringUTFChars(env,filename,NULL);」。請檢查我的Java和C代碼從GetStringUTFChars創建沒有結果JNI
Java代碼:
public class MyffmpegActivity extends Activity {
private static native int logFileInfo(String filename);
static
{
Log.i("HEHA", "HOHA");
System.loadLibrary("mylib");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_myffmpeg);
String path=Environment.getExternalStorageDirectory().getPath();
path=path+"/test.mp4";
Log.i("Name Returned is ", ":"+path);
int x=logFileInfo(path);
}
C代碼
jint Java_com_example_myffmpegtest_MyffmpegActivity_logFileInfo(JNIEnv * env, jobject this, jstring filename)
{
av_register_all();
AVFormatContext *pFormatCtx;
const jbyte *str;
str = (*env)->GetStringUTFChars(env, filename, NULL);
if(av_open_input_file(&pFormatCtx, str, NULL, 0, NULL)!=0)
{
LOGE("Can't open file '%s'\n", str);
return 1;
}
else
{
LOGI("File was opened\n");
LOGI("File '%s', Codec %s",
pFormatCtx->filename,
pFormatCtx->iformat->name
);
}
return 0;}
是的,我已經嘗試過。仍然不能正常工作 – 2013-04-06 07:39:57