Android: How to Capture Screen in Gingerbread(2.3中实现截屏)



	 

	示例代码在:

	frameworks\base\services\su易做图ceflinger\tests\screencap\screencap.cpp

	 

	/* 

	 * Copyright (C) 2010 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 <utils/Log.h> 

	 

	#include <binder/IPCThreadState.h> 

	#include <binder/ProcessState.h> 

	#include <binder/IServiceManager.h> 

	 

	#include <binder/IMemory.h> 

	#include <su易做图ceflinger/ISu易做图ceComposer.h> 

	 

	#include <SkImageEncoder.h> 

	#include <SkBitmap.h> 

	 

	using namespace android; 

	 

	int main(int argc, char** argv) 

	{ 

	    if (argc != 2) { 

	        printf("usage: %s path\n", argv[0]); 

	        exit(0); 

	    } 

	 

	    const String16 name("Su易做图ceFlinger"); 

	    sp<ISu易做图ceComposer> 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)); 

	        exit(0); 

	    } 

	 

	    printf("screen capture success: w=%u, h=%u, pixels=%p\n", 

	            w, h, heap->getBase()); 

	 

	    printf("saving file as PNG in %s ...\n", argv[1]); 

	 

	    SkBitmap b; 

	    b.setConfig(SkBitmap::kARGB_8888_Config, w, h); 

	    b.setPixels(heap->getBase()); 

	    SkImageEncoder::EncodeFile(argv[1], b, 

	            SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality); 

	 

	    return 0; 

	} 

	编译后生成/system/bin/test-screencap

	测试时终端输入test-screencap /mnt/sdcard/scapxx.png

	可以看到SD卡生成截屏文件scapxx.png，默认大小为屏幕分辨率

	 

	如果想把这个功能写到自己的应用里

	写个JNI，参考上面代码即可，但记得权限声明

	 

	<span style="font-size:24px;"><uses-permission android:name="android.permission.READ_FRAME_BUFFER" /></span> 

	 

	当然最好是系统级实现，响应某个组合键来截屏，像Android4.0

	 

	作者 zmyde2010

补充：移动开发 , Android ,