將傳感器值寫入文件

Question

我試圖讓代碼將TotalAccelerate的所有結果寫入.txt文件。 該代碼編寫了將近25到26個樣本，然后自行停止。ToggleButton代碼無法正常工作，我假設for循環會產生這些樣本的問題。 它應該是25個或26個以上的樣本。它應該寫入所有值，以便在脫機（！OnStore.isChecked（））之前可以將其用於脫機目的。 感謝您的配合。

  private GestureDetectorCompat mDetector;
FileOutputStream fileOutputStream;

double TotalAccelerate;
ArrayList<Double> list;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    list = new ArrayList<Double>();

//for Accelermeter
    sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    sensorText = (TextView) findViewById(R.id.sensor);
    accelermeter = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    sm.registerListener(this, accelermeter, SensorManager.SENSOR_DELAY_NORMAL);
    mDetector = new GestureDetectorCompat(this, new MyGestureListener());


    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {
        File Root = Environment.getExternalStorageDirectory();
        File dir = new File(Root.getAbsolutePath() + "/MyApp");
        if (!dir.exists()) {
            dir.mkdir();
        }
        File file = new File(dir, "MyMessage.txt");
        try {
            fileOutputStream = new FileOutputStream(file, true);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

    } else {
        Toast.makeText(getApplicationContext(), "SDcard not found", Toast.LENGTH_LONG).show();
    }

    OnStore = (ToggleButton) findViewById(R.id.onStore);
    OnStore.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
            if (OnStore.isChecked()){
                try {
                    for(double TotalAccelerate : list){
                       // System.out.println(TotalAccelerate);
                        String space = "\n";
                        byte[] convert = space.getBytes();
                        fileOutputStream.write(convert);
                        String finalData;
                        finalData = String.valueOf(TotalAccelerate);
                        fileOutputStream.write(finalData.getBytes());
                    }
                    // fileOutputStream.close();
                    Toast.makeText(getApplicationContext(), "Message saving", Toast.LENGTH_LONG).show();

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }if (!OnStore.isChecked()){
                try {
                    fileOutputStream.flush();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                try {
                    fileOutputStream.close();
                    list.clear();
                    Collections.synchronizedList(list);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                Toast.makeText(getApplicationContext(),"Message Stopped.",Toast.LENGTH_LONG).show();

            }


        }

    });
 }//End OnCreate( )


@Override
public final void onSensorChanged(SensorEvent event) {
    // The light sensor returns a single value.
    // Many sensors return 3 values, one for each axis.
    double xx = event.values[0];
    double yy = event.values[1];
    double zz = event.values[2];
    TotalAccelerate = Math.round(Math.sqrt(Math.pow(xx, 2)
            + Math.pow(yy, 2)
            + Math.pow(zz, 2)));
    Log.i(DEBUG, "Accelerometer = " + TotalAccelerate);

    list.add(TotalAccelerate);
    findPeaks(list);
   sensorText.setText("Total: " + TotalAccelerate);
    Log.i(DEBUG, "list values " + list);

}

Answer 1

似乎問題在於Android由於進行了積極的電源管理而禁用了屏幕，並停止了不可見的進程和活動。

為了解決這個問題，您需要在單獨的線程中運行代碼並獲取喚醒鎖，因此，手機不會進入睡眠模式。 但是，更好的解決方案是創建一個服務（仍需要在單獨的線程中運行代碼）來負責處理傳感器。