android led 框架,详解Android应用层制作LED指示灯

详解Android应用层制作LED指示灯

在Java应用层修改LED指示灯的颜色，这个花了我半天时间， 才实现该功能!

public class LEDActivity extends Activity implements View.OnClickListener {

private static final String TAG = "LED";

Button mLedTest;

int mLedStatus = 0;

private final int mLedColorRed = 0xFFFF0000;

final byte[] LIGHT_ON = { '2', '5', '5' };

final byte[] LIGHT_OFF = { '0' };

private final int RED = 0;

private int color = RED;

String RED_LED_DEV = " /sys/class/leds/torch/brightness";

public void onCreate(Bundle paramBundle) {

super.onCreate(paramBundle);

setContentView(R.layout.led_test);

mLedTest = ((Button)findViewById(R.id.ledcolor));

mLedTest.setOnClickListener(this);

// setledlightcolor(color);

// mLedTest.setTextColor(mLedColorRed);

// mLedTest.setText("RED");

// mLedStatus = 1;

}

public void onClick(View v) {

Log.d("LEDActivity", "---onClick---mLedStatus=" + mLedStatus);

switch (v.getId()) {

case R.id.ledcolor:

if(mLedStatus == 0) {

mLedTest.setText("开");

mLedStatus = 1

}else if(mLedStatus == 1) {

mLedTest.setText("关");

mLedStatus = 0;

}

break;

}

}

@Override

public void finish() {

setledlightcolor(-1);

super.finish();

}

private void setledlightcolor(int color) {

logd("set:" + color);

boolean red = false;

switch (color) {

case RED:

red = true;

break;

default:

break;

}

try {

FileOutputStream foRed = new FileOutputStream(RED_LED_DEV);

Log.d(TAG, "foRed" + foRed);

fRed.write(red ? LIGHT_ON : LIGHT_OFF);

fRed.close();

} catch (Exception e) {

loge(e);

}

}

void logd(Object d) {

Log.d(TAG, "" + d);

}

void loge(Object e) {

Log.e(TAG, "" + e);

}

}

直接在xml中写一个Button,用来实现点击按钮，其实很简单，只是把源码的led指示灯的路径拿出来，用过输出流，将String转化，就能读出灯的状态，直接运行就可以实现该功能.

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