android之应用程序LED

http://www.arm9home.net/read.php?tid-14336-fpage-0-toread--page-1.html

参考友善的LED程序，自己也写了个，不是用友善的libfriendlyarm-hardware.so，自己用NDK中的例子hello-jni写了个程序，已经编译成libhello-jni.so，可惜上不了图。

自己摸索了好久总算有点收获，感谢各位网友的帮忙。部门源码贴出来给大家参考！刚搞完就拿出来分享了，欢迎大家指正。有谁想看libfriendlyarm-hardware.so的源码的可以参考这

个。

JNI部分用C语言实现

复制代码

/*
* 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 <string.h>
#include <jni.h>
#include <fcntl.h> /*包括文件操作，如open() read() close()write()等*/
int fd;
/* This is a trivial JNI example where we use a native method
* to return a new VM String. See the corresponding Java source
* file located at:
*
* apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java
*/
jstring
Java_com_helloworld_helloworld_stringFromJNI( JNIEnv* env,
jobject thiz )
{
return (*env)->NewStringUTF(env, "Hello from JNI create by carlin !");
}
jint Java_com_helloworld_helloworld_openled( JNIEnv* env,
jobject thiz )
{
fd = open("/dev/leds0", O_RDONLY);
if (fd < 0)
{
fd = open("/dev/leds", O_RDONLY);
return 1;
}
return 0;
}
jint Java_com_helloworld_helloworld_setLedState( JNIEnv* env,
jobject thiz ,jint ledID,jint ledState)
{
ioctl(fd,ledState, ledID);
return 1;
}
jint Java_com_helloworld_helloworld_closeled( JNIEnv* env,
jobject thiz )
{
close(fd);
return 1;
}

APP部分即JAVA

复制代码

package com.helloworld;
import android.app.Activity;
import android.widget.TextView;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;
public class helloworld extends Activity {
private Button btnLED1On;
private Button btnLED1Off;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
openled();
btnLED1On = (Button)findViewById(R.id.btnLED1On);
btnLED1Off = (Button)findViewById(R.id.btnLED1Off);
btnLED1On.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) /**当按钮按下*/
{
setLedState(0,1);
}
}
);
btnLED1Off.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) /**当按钮按下*/
{
setLedState(0,0);
}
}
);
}
/* A native method that is implemented by the
* 'hello-jni' native library, which is packaged
* with this application.
*/
public native String stringFromJNI();
public native int openled();
public native int setLedState(int ledID,int ledState);
public native int closeled();
/* This is another native method declaration that is *not*
* implemented by 'hello-jni'. This is simply to show that
* you can declare as many native methods in your Java code
* as you want, their implementation is searched in the
* currently loaded native libraries only the first time
* you call them.
*
* Trying to call this function will result in a
* java.lang.UnsatisfiedLinkError exception !
*/
public native String unimplementedStringFromJNI();
/* this is used to load the 'hello-jni' library on application
* startup. The library has already been unpacked into
* /data/data/com.example.HelloJni/lib/libhello-jni.so at
* installation time by the package manager.
*/
static {
System.loadLibrary("hello-jni");
}
}

图片：
图片：
应用程序在这

右边的那个LED程序是我的

程序下载在 http://www.arm9home.net/job.php?action-download-pid-107653-tid-14336-aid-2661.html

http://www.arm9home.net/read.php?tid-14366-fpage-0-toread--page-1.html

Myled.rar(65 K) 下载次数:310
Myled_apk.rar(15 K) 下载次数:207
windows系统上安装与使用Android NDK r5 .rar(8 K) 下载次数:210
Android通过JNI调用驱动程序(完全解析实例)...rar(358 K) 下载次数:363
在主界面

checkbox做的

Myled.java

复制代码

package com.led;

import android.app.Activity;

import android.os.Bundle;

import android.widget.CheckBox;

import android.widget.CompoundButton;

import com.LedCtr.LedCtr;

public class Myled extends Activity {

/** Called when the activity is first created. */

private CheckBox checkBox1;

private CheckBox checkBox2;

private CheckBox checkBox3;

private CheckBox checkBox4;

LedCtr led;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

led=new LedCtr();

led.openled();

led.setLedState(0,0);

led.setLedState(1,0);

led.setLedState(2,0);

led.setLedState(3,0);

checkBox1=(CheckBox) findViewById(R.id.cb1);

checkBox2=(CheckBox) findViewById(R.id.cb2);

checkBox3=(CheckBox) findViewById(R.id.cb3);

checkBox4=(CheckBox) findViewById(R.id.cb4);

checkBox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

if(checkBox1.isChecked()){

led.setLedState(0,1);

}

else

{

led.setLedState(0,0);

}

}});

checkBox2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

if(checkBox2.isChecked()){

led.setLedState(1,1);

}

else

{

led.setLedState(1,0);

}

}});

checkBox3.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

if(checkBox3.isChecked()){

led.setLedState(2,1);

}

else

{

led.setLedState(2,0);

}

}});

checkBox4.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){

@Override

public void onCheckedChanged(CompoundButton buttonView,

boolean isChecked) {

if(checkBox4.isChecked()){

led.setLedState(3,1);

}

else

{

led.setLedState(3,0);

}

}});

}

}

LedCtr.java

复制代码

package com.LedCtr;

public class LedCtr {

public native int openled();

public native int setLedState(int ledID,int ledState);

public native int closeled();

public native StringunimplementedStringFromJNI();

static {

System.loadLibrary("led-jni");

}

}

led-jni

复制代码

/*

* 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 <string.h>

#include <jni.h>

#include <fcntl.h> /*包括文件操作，如open() read() close()write()等*/

int fd;

/* This is a trivial JNI example where we use a native method

* to return a new VM String. See the corresponding Java source

* file located at:

*

* apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java

*/

jstring

Java_com_LedCtr_LedCtr_stringFromJNI( JNIEnv* env,

jobject thiz )

{

return (*env)->NewStringUTF(env, "Hello from JNI create by carlin !");

}

jint Java_com_LedCtr_LedCtr_openled( JNIEnv* env,

jobject thiz )

{

fd = open("/dev/leds0", O_RDONLY);

if (fd < 0)

{

fd = open("/dev/leds", O_RDONLY);

return 1;

}

return 0;

}

jint Java_com_LedCtr_LedCtr_setLedState( JNIEnv* env,

jobject thiz ,jint ledID,jint ledState)

{

ioctl(fd,ledState, ledID);

return 1;

}

jint Java_com_LedCtr_LedCtr_closeled( JNIEnv* env,

jobject thiz )

{

close(fd);

return 1;

}

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