我想存储用户的步数,但是当我重新启动或关闭手机时,数据就会消失。 SharedPreferences不保存数据。当我重新启动手机后进入应用程序时,它会变为0。如何解决它?sharedPreferences不保存数据
的代码如下:
package com.threemusketeers.healthmaster;
import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.content.SharedPreferences;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class Pedometer extends Activity implements SensorEventListener {
private TextView textView;
private SensorManager mSensorManager;
private Sensor mStepCounterSensor;
private Sensor mStepDetectorSensor;
SharedPreferences sharedPreferences;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pedometer);
textView = (TextView) findViewById(R.id.textview);
mSensorManager = (SensorManager)
getSystemService(Context.SENSOR_SERVICE);
mStepCounterSensor = mSensorManager
.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
mStepDetectorSensor = mSensorManager
.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);
}
public void onSensorChanged(SensorEvent event) {
sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
SharedPreferences.Editor editor = sharedPreferences.edit();
Sensor sensor = event.sensor;
float[] values = event.values;
int value = -1;
if (values.length > 0) {
value = (int) values[0];
}
if (sensor.getType() == Sensor.TYPE_STEP_COUNTER) {
editor.putInt("steps", value).commit();
textView.setText("Step Counter Detected : " + sharedPreferences.getInt("steps", 0));
} else if (sensor.getType() == Sensor.TYPE_STEP_DETECTOR) {
// For test only. Only allowed value is 1.0 i.e. for step taken
editor.putInt("steps", value).commit();
textView.setText("Step Detector Detected : " + sharedPreferences.getInt("steps", 0));
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mStepCounterSensor,
SensorManager.SENSOR_DELAY_FASTEST);
mSensorManager.registerListener(this, mStepDetectorSensor,
SensorManager.SENSOR_DELAY_FASTEST);
}
protected void onStop() {
super.onStop();
mSensorManager.unregisterListener(this, mStepCounterSensor);
mSensorManager.unregisterListener(this, mStepDetectorSensor);
}
}
你还需要调用'editor.commit( );' –
我已经叫它 editor.putInt(“steps”,value).commit(); –
啊,对不起......错过了。 –