Android系统移植(六)

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一、APK源码示例

/*监听按钮LED ON  LED OFF 按下的时候文本改变      */package com.up;import android.app.Activity;import android.os.Bundle;import android.widget.TextView;import android.widget.Button;import android.view.View.OnClickListener;import android.view.View;public class BunflyActivity extends Activity{        TextView txt;        Button btn_on,btn_off;        OnClickListener listener;        native int ledon();        native int ledoff();        static{            System.loadLibrary("4412led");            };    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        txt.setText("please client button");        btn_on.setText("LED ON");        btn_off.setText("LED OFF");        listener = new OnClickListener(){                public void onClick(View v){                        if(v == btn_on){                                int a = ledon();                                if(-1 == a){                                        txt.setText("open error");                                }else if(-2 == a){                                        txt.setText("ioctl error");                                }else {                                        txt.setText("Led On");}                        }else if(v == btn_off){                                int b = ledoff();                                if(-1 == b){                                        txt.setText("open error");                                }else if(-2 == b){                                        txt.setText("ioctl error");                                }else {                                        txt.setText("Led 0ff");}                        }                }        };        btn_on.setOnClickListener(listener);        btn_off.setOnClickListener(listener);    }}

二、APK的Makefile

#APK调用动态库，再调用底层驱动LOCAL_PATH      := $(call my-dir)include $(CLEAR_VARS)#路径比较长用 callLOCAL_SRC_FILES := $(call all-subdir-java-files)#编译出来的东西   bunfly.apkLOCAL_PACKAGE_NAME :=  bunfly#依赖的动态库LOCAL_JAVA_SHARED_LIBRARIES :=  bunflyled#编译成应用程序include $(BUILD_PACKAGE)

三、JNI源码示例

#include <jni.h>#include <sys/ioctl.h>#include <fcntl.h>#include <unistd.h>int Java_com_up_BunflyActivity_ledon(JNIEnv *env,jclass thiz) {        int fd = 0;        fd = open("/dev/bunflyled",O_RDWR);        if(fd < 0){                return -1;        }        int rev = 0;        rev = ioctl(fd,555);        if(rev < 0)        {                return -2;        }        return 1;}int Java_com_up_BunflyActivity_ledoff(JNIEnv *env,jclass thiz) {        int fd2 = 0;        fd2 = open("/dev/bunflyled",O_RDWR);        if(fd2 < 0){                return -1;        }        int r = 0;        r = ioctl(fd2,666);        if(r < 0)        {                return -2;        }        return 1;}

四、JNI的Makefile

LOCAL_PATH := $(call my-dir)LOCAL_SRC_FILES := bunflyled.cLOCAL_MODULE := lib4412ledLOCAL_SHARED_LIBRARIES := libcinclude $(BUILD_SHARED_LIBRARY)

五、LED驱动程序示例

#include <linux/module.h>#include <linux/init.h>#include <linux/sched.h>#include <linux/thread_info.h>#include <linux/io.h>#include <linux/ioport.h>#include <linux/interrupt.h>#include <linux/irq.h>#include <linux/clk.h>#include <linux/gpio.h>#include <linux/fs.h>#include <linux/cdev.h>#include <linux/device.h>#define LED_ON  555 #define LED_OFF 666#define DEVICE_NAME "bunflyled"MODULE_LICENSE("GPL");void led_on();void init_led();void led_off();int led_open(struct inode *no, struct file *fp);long led_unlocked_ioctl(struct file *fp, unsigned int cmd, unsigned long args);unsigned long led_init;unsigned long *GPM4CON,*GPM4DAT;struct cdev bunflyLed;struct class *cdev_class;struct file_operations op = {        .open = led_open,        .unlocked_ioctl = led_unlocked_ioctl,};dev_t devno;int bunfly_init(){        int result;        int err;        result = alloc_chrdev_region(&devno,0,1,DEVICE_NAME);        if(result){                printk("alloc devno failure.\n");                unregister_chrdev_region(devno,1);                return result;        }else{                printk("alloc devno success.\n");        }        cdev_init(&bunflyLed,&op);        err = cdev_add(&bunflyLed,devno,1);        if(err){                printk("add error.\n");                unregister_chrdev_region(devno,1);                return err;        }        cdev_class = class_create(THIS_MODULE, DEVICE_NAME);//动态创建设备结点        device_create(cdev_class,NULL, devno, 0, DEVICE_NAME);        printk("bunflyled driver init success.\n");        return 0;}void bunfly_exit(){        device_destroy(cdev_class, devno);        class_destroy(cdev_class);        unregister_chrdev_region(devno,1);        printk("bunflyled driver delete success.\n");}module_init(bunfly_init);module_exit(bunfly_exit);int led_open(struct inode *no, struct file *fp){        printk("bunfly led driver open.\n ");        return 0;}long led_unlocked_ioctl(struct file *fp, unsigned int cmd, unsigned long args){        init_led();        switch(cmd)        {                case LED_ON:                        led_on();                        break;                case LED_OFF:                        led_off();                        break;                default:                        printk("unkown command\n");                        break;        }        return 0;}void init_led(){        led_init = ioremap(0x11000000,SZ_4K);        GPM4CON = led_init + 0x2e0;        GPM4DAT = led_init + 0x2e4;        *GPM4CON = 0x1111;        *GPM4DAT = 0xf;}void led_on(){        *GPM4CON = 0x1111;        *GPM4DAT = 0x0;}void led_off(){        *GPM4CON = 0x1111;        *GPM4DAT = 0xf;}

至此，Android系统移植项目完结。

总结：
1.项目的进度有点慢，LCD、触摸屏的驱动还在调试中
2.写了不少文档，发现越写越乱，文笔有待提高
3.通过该项目，深刻理解Android框架，熟悉了上层与底层的调用流程

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