健康宝——呼吸频率部分开发（八）

呼吸频率页面的Activity

当点击页面的开始测量按钮时，页面进行一个倒计时20秒，倒计时为0时显示呼吸频率
通过将页面的点击按钮实现onclick事件，blowRun每隔一段时间获取分贝值然后刷新大圆盘，这里要注意的是在子线程操作刷新view的时候要用，这里用了一个handler机制来控制开始和结束，每次更新完页面都把blowRun重新加入到handler中，直到倒计时20秒结束，将blowRun从handler中移除
代码：

public class BreathSpeedActivity extends BaseActivity implements View.OnClickListener{
TextView recordTV;
Button mBlowBtn;
private static int utilEnd = 20;
float volume = 10000;
private SoundDiscView soundDiscView;
private BreathRecoder mRecorder;
private static final int msgWhat = 0x1001;
private static int count = 0;
private static int[] sampleValue = new int[200];
private int frequency = 0;
private static int sum = 0;
private Handler handler1 = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_breath_speed);
    initTitleBar("呼吸频率", true);
    mRecorder = new BreathRecoder();
    recordTV = (TextView) findViewById(R.id.recordTV);
    mBlowBtn = (Button) findViewById(R.id.mBlowBtn);
    mBlowBtn.setOnClickListener(this);
    //安卓新版本中，敏感权限必须动态申请，此处进行权限申请
    PermitTool.verifyRecord(this);
    PermitTool.verifySdcard(this);
}


/**
 * 开始记录
 *
 * @param fFile
 */
public void startRecord(File fFile) {
    try {
        mRecorder.setMyRecAudioFile(fFile);
        if (mRecorder.startRecorder()) {
            World.setDbCount(30);
            soundDiscView.refresh();
        } else {
            Toast.makeText(this, "启动录音失败", Toast.LENGTH_SHORT).show();
        }
    } catch (Exception e) {
        Toast.makeText(this, "录音机已被占用或录音权限被禁止", Toast.LENGTH_SHORT).show();
        e.printStackTrace();
    }
}

@Override
protected void onResume() {
    super.onResume();
    soundDiscView = (SoundDiscView) findViewById(R.id.soundDiscView);
    File file = FileUtil.createFile("temp.amr");
    if (file != null) {
        Log.v("file", "file =" + file.getAbsolutePath());
        startRecord(file);
    } else {
        Toast.makeText(getApplicationContext(), "创建文件失败", Toast.LENGTH_LONG).show();
    }
}

/**
 * 停止记录
 */
@Override
protected void onPause() {
    super.onPause();
    World.setDbCount(30);
    soundDiscView.refresh();
    handler1.removeCallbacks(blowThread);
    mRecorder.delete();

}

@Override
protected void onDestroy() {
    mRecorder.delete();
    super.onDestroy();
}

@Override
protected void onRestart() {
    super.onRestart();
  //  onResume();
    World.setDbCount(30);
    soundDiscView.refresh();
}

@Override
public void onClick(View v) {
    utilEnd = 20;
    frequency = 0;
    count = 0;
    sum = 0;
    for (int i:sampleValue)
    {
        i = 0;
    }
    mBlowBtn.setEnabled(false);
    mBlowBtn.setText("测量中");
    handler1.post(blowThread);
}



 Runnable blowThread = new Runnable(){
    @Override
    public void run()
    {

            volume = mRecorder.getMaxAmplitude();  //获取声压值
            if (volume > 0 && volume < 1000000)
            {
                World.setDbCount(20 * (float) (Math.log10(volume)));  //将声压值转为分贝值
                int temp = (int) World.dbCount;
                if (count < 200)
                {
                    sampleValue[count] = temp;
                    sum = sum + temp;
                }

                System.out.print("temp:" + temp + "  ");

                count++;
                System.out.print("count:" + count + "  ");

            }

            try {
                Thread.sleep(100);

            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            soundDiscView.refresh();

        if(count == 200){
            int avg = sum / 200;
            for (int i = 1; i < 199; i++) {
                if (sampleValue[i] > avg && sampleValue[i] >= sampleValue[i - 1] && sampleValue[i] > sampleValue[i + 1])
                    frequency++;

            }
            recordTV.setText("您的呼吸频率为" + frequency * 3 + "次每分钟");
            mBlowBtn.setText("开始");
            mBlowBtn.setEnabled(true);
            handler1.removeCallbacks(blowThread);
        }else {
            if (count % 10 == 0 && utilEnd != 1) {
                utilEnd--;
                recordTV.setText("倒计时" + utilEnd + "秒");
            }

            handler1.post(blowThread);
        }

    }
};
}