Android(安卓)屏幕截图（底层实现方式）

加载底层库ScreenCap.java：

public class ScreenCap {static {System.loadLibrary("scrcap");}static native void captureScreenToFile(String fileName);}

广播接收器：

public class ScreenCapReceiver extends BroadcastReceiver {private static final String LOG_TAG = "ScreenCapReceiver";@Overridepublic void onReceive(Context context, Intent intent) {// Temp code, should not in main threadLog.d(LOG_TAG, "generate file name");                //Checking external storageboolean mExternalStorageWriteable = false;String state = Environment.getExternalStorageState();if (Environment.MEDIA_MOUNTED.equals(state)) {mExternalStorageWriteable = true;} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {mExternalStorageWriteable = false;} else {mExternalStorageWriteable = false;}if (!mExternalStorageWriteable)            return;File file = new File(context.getExternalFilesDir(Environment.DIRECTORY_PICTURES), "SCRCAP_"+System.currentTimeMillis()+".png");Log.d(LOG_TAG, "Capture screen to : " + file.getAbsolutePath());ScreenCap.captureScreenToFile(file.getAbsolutePath());Log.d(LOG_TAG, "screen captured");}}

ScreenCap.cpp:

#include <utils/Log.h>#include <binder/IPCThreadState.h>#include <binder/ProcessState.h>#include <binder/IServiceManager.h>#include <binder/IMemory.h>#include <surfaceflinger/ISurfaceComposer.h>#include <SkImageEncoder.h>#include <SkBitmap.h>#include "com_cust_android_screencap_ScreenCap.h"using namespace android;/* * Class:     com_cust_android_screencap_ScreenCap * Method:    captureScreenToFile * Signature: (Ljava/lang/String;)V */JNIEXPORT void JNICALL Java_com_cust_android_screencap_ScreenCap_captureScreenToFile  (JNIEnv *env, jclass clazz, jstring fileName) {    const String16 name("SurfaceFlinger");    sp<ISurfaceComposer> composer;    getService(name, &composer);    sp<IMemoryHeap> heap;    uint32_t w, h;    PixelFormat f;    status_t err = composer->captureScreen(0, &heap, &w, &h, &f, 0, 0);    if (err != NO_ERROR) {        fprintf(stderr, "screen capture failed: %s\n", strerror(-err));        return;    }    LOGD("screen capture success: w=%u, h=%u, pixels=%p\n",            w, h, heap->getBase());    SkBitmap b;    b.setConfig(SkBitmap::kARGB_8888_Config, w, h);    b.setPixels(heap->getBase());    SkImageEncoder::EncodeFile(env->GetStringUTFChars(fileName, 0), b,            SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality);}JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {    return JNI_VERSION_1_6;}JNIEXPORT void JNICALL JNI_OnUnload(JavaVM* vm, void* reserved) {}

下载源码：http://download.csdn.net/detail/weiyirong/5836997

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