学步园

Java 代码

package com.bitmaptest;


import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.Log;
import android.view.View;


public class bitmaptest extends Activity {
	
	private static final int SCP = 0;
	private char [] mBuf;
	private byte [] mByteBuf;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mBuf = new char[320*480*3];
        mByteBuf = new byte[320*480*2];

        setContentView(new myView(this));
    }

   class myView extends View{   
    	  
        public myView(Context context) {   
            super(context);   
        }   
        protected void onDraw(Canvas canvas) {   
            super.onDraw(canvas);   
            byte[] buf = new byte[320*480*2 ];
         
        	Log.d("scrcap", "scrcap=------------------------");
        	if(0 == scrcap(buf))
        	{
        		Log.d("scrcap", "back");
                int[] colors = new int[320*480]; 

                
                for(int i = 0;i < colors.length;i ++)
                {
                    int r = 0x000000ff &( ((int)buf[i*2 +1] & 0x000000f8)>>3 );
                    int g = 0x000000ff &( (((int)buf[i*2 +1] & 0x00000007) << 3) |((int)buf[i*2 ] & 0x000000e0)>>5  );
                    int b = 0x000000ff &( ((int)buf[i*2] & 0x0000001f) );
                	colors[i] = 0xff000000 | (r << 19 )| ( g << 10 )| b<<3;
                }
                
                Bitmap.Config config = Bitmap.Config.RGB_565;
                Bitmap mBitmap = Bitmap.createBitmap(colors,320,480,config);
	            Paint mPaint = new Paint();   
	            canvas.drawBitmap(mBitmap,0, 0, mPaint);   
        	}   
         
         
        } 
        
    }
    public static native int scrcap(byte[] data);
    static {
    	System.loadLibrary("scrcap");
    };  
       
}

JNI 代码  在虚拟机下无法直接使用， fb open错误

#include <jni.h>
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <android/log.h>
#include <sys/mman.h>


#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, "!!!!!", __VA_ARGS__)


#define FB_DEV "/dev/graphics/fb0"
#define SIZE 320*480*2

jint Java_com_bitmaptest_bitmaptest_scrcap(JNIEnv* env, jobject thiz,jbyteArray data)
{
	LOGE("--------=================-----------------");
	jbyte* pdata = (*env)->GetByteArrayElements(env,data, 0);
	char buf[SIZE];
	int fd = open(FB_DEV,O_RDWR);
	if(fd <= 0)
	{
		LOGE("OPEN fb device open error");
		return -1;
	}
	void *	fb_mem = (void *)mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if(-1L == (int)fb_mem)
	{
		LOGE("OPEN fb device mmap error");
		return -1;
	}
	memcpy(buf,fb_mem,SIZE);
	munmap(fb_mem,SIZE);
	close(fd);

	memcpy(pdata,buf,SIZE);

	(*env)->ReleaseByteArrayElements(env,data, pdata, 0);
		return 0;

}

JNI makefile

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)



LOCAL_C_INCLUDES +=			$(JNI_H_INCLUDE)

LOCAL_SRC_FILES := 			scrcap.c
					
                    

	
LOCAL_LDLIBS:=-L$(SYSROOT)/usr/lib -llog


LOCAL_MODULE    := scrcap

include $(BUILD_SHARED_LIBRARY)