三軸加速感測器

2015/11/21

MainActivity

package com.example.jince.speed;

import android.hardware.Sensor;

import android.hardware.SensorEvent;

import android.hardware.SensorEventListener;

import android.hardware.SensorManager;

import android.os.Bundle;

import android.support.design.widget.FloatingActionButton;

import android.support.design.widget.Snackbar;

import android.support.v7.app.AppCompatActivity;

import android.support.v7.widget.Toolbar;

import android.view.View;

import android.view.Menu;

import android.view.MenuItem;

import android.app.Activity;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements SensorEventListener {

SensorManager sm; //用來參照【感測器管理員】

Sensor sr; //用來參照【加速感測器物件】

TextView txv; //用來參照畫面中的文字元件

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

sm = (SensorManager) getSystemService(SENSOR_SERVICE); //由系統服務取得感測器管理員

sr = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); //取得加速感測器

txv = (TextView) findViewById(R.id.textView1); // 取得TextView元件

}

public void onSensorChanged(SensorEvent event) {

txv.setText(String.format("X軸: %1.2f\nY軸: %1.2f\nZ軸: %1.2f\n",

event.values[0], event.values[1], event.values[2]));

}

public void onAccuracyChanged(Sensor arg0, int arg1) { } //不需處理

@Override

protected void onResume() {

super.onResume();

sm.registerListener(this,sr,SensorManager.SENSOR_DELAY_NORMAL); //向加速感測器 (sr) 註冊監聽物件(this)

}

@Override

protected void onPause() {

super.onPause();

sm.unregisterListener(this); //取消監聽物件(this) 的註冊

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.menu_main, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

//noinspection SimplifiableIfStatement

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

}

}

content_main_xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

app:layout_behavior="@string/appbar_scrolling_view_behavior"

tools:context="com.example.jince.speed.MainActivity"

tools:showIn="@layout/activity_main">

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="New Text"

android:id="@+id/textView1"

android:layout_centerVertical="true"

android:layout_centerHorizontal="true"

android:textSize="25dp" />

</RelativeLayout>