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; } } @Overridepublic 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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