Android三色呼吸燈實現

三色（紅綠藍）呼吸燈，主要控制來電，短息，未接三種情況下不同顏色呼吸燈顯示。

具體實現在應用層（Phone，mms）獲取呼吸燈服務，調用預留的接口，傳遞頻率和色值；

    private void RGBBreathLedsSwitchOn() {
        IBreathLedsService ledSvc = IBreathLedsService.Stub.asInterface(ServiceManager.getService("breath_leds"));　　// 獲取呼吸燈服務
        int time = 2;
        int reqType = 0x80 | time;　　// 頻率
        int ledType = 1;　　　　　　　　// 色值
        try {
            if(FeatureOption.HEXING_CUSTOM_BREATH_LEDS) {　　// 宏控制代碼
                ledSvc.setLedsBrightness(reqType, ledType);　// 調用setLedsBrightness()接口
                Log.i(this, "Breathleds SwitchOn, reqType = " + reqType + ", ledType = " + ledType);
            } else {
                Log.i(this, "Not Support BreathLeds.");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

在Service端，繼承IBreathLedsService.aidl服務通訊，實現setLedsBrightness()接口，調用本地方法，訪問JNI；

public class BreathLedsService extends IBreathLedsService.Stub {

    // 亮度等級(32級)
    private static final int[] BRIGHTNESS_LEVEL = {
            0,   1,   2,   4,   6,   10,  13,  18,
            22,  28,  33,  39,  46,  53,  61,  69,
            78,  86,  96,  106, 116, 126, 138, 149,
            161, 173, 186, 199, 212, 226, 240, 255,
    };

    public BreathLedsService(Context context) {
        init_native();
    }

    public void turnOnLeds() {
        set_brightness_native(0x80);
    }

    public void turnOffLeds() {
        set_brightness_native(0x00);
    }

    public void setLedsBrightness(int which, int level) {
        //if ((which > 12) || (which < 1))  return;
      
        //level = level % 32;
        int data = (which << 8) | level;
        set_brightness_native(data);
    }

    private native void init_native();
    private native void set_brightness_native(int data);
}

注意：需在SystemServer.java中add服務

    try {
        Slog.i(TAG, "BreathLeds Service");
        ServiceManager.addService("breath_leds", new BreathLedsService(context));　　// add service
    } catch (Throwable e) {
        Slog.e(TAG, "Failure starting BreathLeds Service", e);    
    }

在JNI中實現模塊的初始化，函數映射和注冊本地方法，完成呼吸燈模塊的整個流程；

#define LOG_TAG "BreathLedsService"

#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"

#include <hardware/hw_breath_leds.h>
#include <hardware/hardware.h>

namespace android {

    struct breath_leds_device_t* leds_dev = NULL;  // hw_breath_leds.h中定義的HAL設備結構體
    
    static void leds_ctl_open(const struct hw_module_t* module, struct breath_leds_device_t** dev)
    {
        // 調用open函數進行一系列初始化工作
        module->methods->open(module, BREATH_LEDS_HW_MODULE_ID, (struct hw_device_t**) dev);
    }
    
    static void init_leds(JNIEnv* env, jobject thiz)
    {
        breath_leds_module_t* leds_module = NULL;
        
        // 通過hw_get_module函數查找HAL模塊
        if (hw_get_module(BREATH_LEDS_HW_MODULE_ID, (const hw_module_t**) &leds_module) == 0)
        {
            leds_ctl_open(&(leds_module->breath_module), &leds_dev);   // 裝載leds_dev
        }
    }
    
    static void set_brightness_leds(JNIEnv* env, jobject thiz, jint level)
    {
        leds_dev->set_breath_value(leds_dev, level);
    }
    
    // 定義jni函數映射
    static const JNINativeMethod method_tab[] = {
        {"init_native", "()V", (void*) init_leds},
        {"set_brightness_native", "(I)V", (void*) set_brightness_leds},
    };
    
    int register_android_server_BreathLedsService(JNIEnv *env)
    {
        return AndroidRuntime::registerNativeMethods(env, 
                      "com/android/server/BreathLedsService", method_tab, NELEM(method_tab));
    }

}  /*  namespace android  */

 

 

感言：勵志向Android系統框架層奮斗，不斷學習，不斷努力；從現在起，往垂直方向深度學習。