Android Studio -显示传感器结果时出错

Question

还是第一次…当尝试运行我的应用程序，我只是得到一个"错误"，它关闭。如果我禁用"line"来显示传感器值，它就可以正常运行。请帮助我!!

public class MainActivity extends ActionBarActivity
    implements NavigationDrawerFragment.NavigationDrawerCallbacks {
    /**
     * Fragment managing the behaviors, interactions and presentation of the navigation drawer.
     */
    private NavigationDrawerFragment mNavigationDrawerFragment;

    /**
     * Used to store the last screen title. For use in {@link #restoreActionBar()}.
     */
    private CharSequence mTitle;

    //wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
    TextView baroText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mNavigationDrawerFragment = (NavigationDrawerFragment)
                getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
        mTitle = getTitle();
        // Set up the drawer.
        mNavigationDrawerFragment.setUp(
                R.id.navigation_drawer,
                (DrawerLayout) findViewById(R.id.drawer_layout));
        //wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
        uiVars();
        SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);
        sensorManager.registerListener(new MyListener(), sensor,
                SensorManager.SENSOR_DELAY_NORMAL);
    }
    public void uiVars(){
        baroText = (TextView) findViewById(R.id.zSensorInfo2);
        //timeText = (TextView) findViewById(R.id.timeTxt);
        //refresh = (Button) findViewById(R.id.baroRefreshBtn);
    }
    class MyListener implements SensorEventListener {
        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {
            // TODO
        }
        @Override
        public void onSensorChanged(SensorEvent event) {
            //long timestamp = event.timestamp;
            float value = event.values[0];
            // do something with the values
            String valueString = String.valueOf(value);
            //baroText.setText(valueString);
        }
    }
}

Answer 1

如果没有logcat结果或任何其他详细信息，很难找出错误所在。为了更好的帮助，请在下次调试时提供调试信息。

根据我对代码的简要浏览，您可能对这一行有问题?

String valueString = String.valueOf(value);
//baroText.setText(valueString);

试试改成:

String valueString = Float.toString(value);
baroText.setText(valueString);

另一个问题是，您的传感器值可能根本没有返回值。所以也许要先检查value是否为空?如果是这种情况，valueString试图将空浮点值转换为字符串，这会出错