android中播放视频 使用getNativeSurface FindClass 出错

C/C++ code

/* * Copyright (C) 2011 Petr Havlena  havlenapetr@gmail.com * Copyright (C) 2009 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */#include <android/surface.h>#include <surfaceflinger/Surface.h>#include <utils/Log.h>#include <SkBitmap.h>#include <SkCanvas.h>#define TAG "SurfaceWrapper"using namespace android;static Surface*         surface;static Surface::SurfaceInfo surfaceInfo;static SkBitmap         bmpClient;static SkBitmap         bmpSurface;static SkRect           rect_bmpClient;static SkRect           rect_bmpSurface;static SkMatrix         matrix;staticSurface* getNativeSurface(JNIEnv* env, jobject jsurface) {    jclass clazz = env->FindClass("android/view/Surface");    //android 2.2    //jfieldID field_surface = env->GetFieldID(clazz, "mSurface", "I");    //android 2.3    jfieldID field_surface = env->GetFieldID(clazz, "mNativeSurface", "I");    if(field_surface == NULL) {        __android_log_print(ANDROID_LOG_ERROR, TAG, "GetFieldID ERROR, field_surface == NULL!");        return NULL;    }    return (Surface *) env->GetIntField(jsurface, field_surface);}staticvoid initBitmap(SkBitmap *bitmap, int format, int width, int height) {    switch (format) {        case PIXEL_FORMAT_RGBA_8888:__android_log_print(ANDROID_LOG_INFO, TAG, "setConfig:PIXEL_FORMAT_RGBA_8888");            bitmap->setConfig(SkBitmap::kARGB_8888_Config,                width, height);            break;                    case PIXEL_FORMAT_RGBA_4444:__android_log_print(ANDROID_LOG_INFO, TAG, "setConfig:PIXEL_FORMAT_RGBA_4444");            bitmap->setConfig(SkBitmap::kARGB_4444_Config,                width, height);            break;                    case PIXEL_FORMAT_RGB_565:__android_log_print(ANDROID_LOG_INFO, TAG, "setConfig:PIXEL_FORMAT_RGBA_565");            bitmap->setConfig(SkBitmap::kRGB_565_Config,                width, height);            break;                    case PIXEL_FORMAT_A_8:__android_log_print(ANDROID_LOG_INFO, TAG, "setConfig:PIXEL_FORMAT_A_8");            bitmap->setConfig(SkBitmap::kA8_Config,                width, height);            break;                    default:__android_log_print(ANDROID_LOG_INFO, TAG, "setConfig:kNo_Config");            bitmap->setConfig(SkBitmap::kNo_Config,                width, height);            break;    }}int AndroidSurface_register(JNIEnv* env, jobject jsurface) {    __android_log_print(ANDROID_LOG_INFO, TAG, "registering video surface");        surface = getNativeSurface(env, jsurface);    if(surface == NULL) {__android_log_print(ANDROID_LOG_ERROR, TAG, "getNativeSurface ERROR, surface == NULL!");         return ANDROID_SURFACE_RESULT_JNI_EXCEPTION;    }    else{__android_log_print(ANDROID_LOG_INFO, TAG, "registered");    }    return ANDROID_SURFACE_RESULT_SUCCESS;}int AndroidSurface_getPixels(int width, int height, void** pixels) {    __android_log_print(ANDROID_LOG_INFO, TAG, "getting surface's pixels %ix%i", width, height);    if(surface == NULL) {__android_log_print(ANDROID_LOG_ERROR, TAG, "gAndroidSurface_getPixels: surface == NULL!");        return ANDROID_SURFACE_RESULT_JNI_EXCEPTION;    }    initBitmap(&bmpClient, PIXEL_FORMAT_RGB_565, width, height);    bmpClient.setIsOpaque(true);    //-- alloc array of pixels    if(!bmpClient.allocPixels()) {__android_log_print(ANDROID_LOG_ERROR, TAG, "gAndroidSurface_getPixels: bmpClient.allocPixels() error!");        return ANDROID_SURFACE_RESULT_COULDNT_INIT_BITMAP_CLIENT;    }    *pixels = bmpClient.getPixels();__android_log_print(ANDROID_LOG_ERROR, TAG, "gAndroidSurface_getPixels:getted *pixels = 0x%08x", *pixels);        //__android_log_print(ANDROID_LOG_INFO, TAG, "getted");    return ANDROID_SURFACE_RESULT_SUCCESS;}staticvoid doUpdateSurface(bool autoscale) {    SkCanvas canvas(bmpSurface);    if(autoscale)    {        rect_bmpSurface.set(0, 0, bmpSurface.width(), bmpSurface.height());        rect_bmpClient.set(0, 0, bmpClient.width(), bmpClient.height());        matrix.setRectToRect(rect_bmpClient, rect_bmpSurface, SkMatrix::kFill_ScaleToFit);        canvas.drawBitmapMatrix(bmpClient, matrix);    }    else    {        canvas.drawBitmap(bmpClient, 0, 0);    }}int AndroidSurface_updateSurface(bool autoscale) {    if(surface == NULL) {        return ANDROID_SURFACE_RESULT_JNI_EXCEPTION;    }    if (!surface->isValid()) {        return ANDROID_SURFACE_RESULT_NOT_VALID;    }    if (surface->lock(&surfaceInfo) < 0) {        return ANDROID_SURFACE_RESULT_COULDNT_LOCK;    }    /* create surface bitmap with pixels of surface */    if(bmpSurface.width() != surfaceInfo.w ||        bmpSurface.height() != surfaceInfo.h)    {        initBitmap(&bmpSurface, surfaceInfo.format,            surfaceInfo.w, surfaceInfo.h);    }    bmpSurface.setPixels(surfaceInfo.bits);    /* redraw surface screen */    doUpdateSurface(autoscale);        if (surface->unlockAndPost() < 0) {        return ANDROID_SURFACE_RESULT_COULDNT_UNLOCK_AND_POST;    }    return ANDROID_SURFACE_RESULT_SUCCESS;}int AndroidSurface_unregister() {    __android_log_print(ANDROID_LOG_INFO, TAG, "unregistering video surface");    __android_log_print(ANDROID_LOG_INFO, TAG, "unregistered");    return ANDROID_SURFACE_RESULT_SUCCESS;} 
 

代码如上 在 jclass clazz = env->FindClass("android/view/Surface");
出错 这个是为什么呢
谢谢 指导

[解决办法]
出错有什么提示没有?
[解决办法]
你java代码里修改了surface的尺寸，这个修改在不同的线程里操作的所以会导致这种情况。
你应该在surface渲染线程里setFixedSize
你可以通过setOnVideoSizeChangedListener来监听或者直接在surfaceChanged方法里设置