package com.example.ex5_2_2;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    SensorManager manager;
    Sensor mAccerometer;
    TextView tvAlarm;
    //存放初始值和当前值。
    private float[] slient = new float[3];
    private float[] current = new float[3];
    //表示在手机静止之前等待的时间。
    private static int iWait = 0;
    //移动精度
    private float accuracy = 0.5f;
    //是否在移动
    private boolean isMoving = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvAlarm = (TextView) findViewById(R.id.tvAlarm);

        manager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mAccerometer = manager.getDefaultSensor(
                Sensor.TYPE_ACCELEROMETER);
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i("test", "into resume");
        iWait = 0;
        manager.registerListener(listener, mAccerometer, 
                SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onStop() {
        manager.unregisterListener(listener);
        super.onStop();
    }

    SensorEventListener listener = new SensorEventListener() {
        @Override
        public void onSensorChanged(SensorEvent event) {
            iWait++;
            //当前值
            current[0] = event.values[0];
            current[1] = event.values[1];
            current[2] = event.values[2];
            String s = "";
            //给用户一点时间放手机，iWait=10的时候为初始化状态。
            if (iWait <= 20) {
                s = s + "init  : waiting ....,iWait=" + iWait + "\n";
                //初始值。
                slient[0] = event.values[0];
                slient[1] = event.values[1];
                slient[2] = event.values[2];
            } else {
                for (int i = 0; i < slient.length; i++) {
                    if (Math.abs(slient[i] - current[i]) > accuracy) {
                        Log.i("test", slient[i] + "....." + current[i]);
                        isMoving = true;
                        if (isMoving) {
                            alarm();
                        }
                    }
                }
            }

            s = "\n iWait = " + iWait;
            s = s + "\nx=" + current[0];
            s = s + "\ny=" + current[1];
            s = s + "\nz=" + current[2];

            tvAlarm.setText(s);
        }

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }
    };

    /**
     * 报警
     */
    private void alarm() {
        Log.i("test", " 手机被移动.....报警中...");
        Toast.makeText(MainActivity.this, "响铃中.... ", 
                Toast.LENGTH_SHORT).show();
    }
}