wifi开启的一个例子

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WIFI开启的一个例子，下面是给出的主要代码：

1、 //定义wifiManager，主要是涉及和wifi配置和管理相关的类

WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

2、wifi.startScan();//开始wifi信号的扫描

3、List<ScanResult> resultList = wifi.getScanResults();//得到扫描的结果

ScanResult用于保存扫描可用的wifi的信息

4、//网络连接列表，这个是得到配置好的wifi连接

ListIterator<WifiConfiguration> configs = wifi.getConfiguredNetworks().listIterator();

Sensor：

Sensor的类型：

put(R.id.sensor_accel, SensorManager.SENSOR_ACCELEROMETER);//加速度传感器

put(R.id.sensor_light, SensorManager.SENSOR_LIGHT);//光传感器

put(R.id.sensor_mag, SensorManager.SENSOR_MAGNETIC_FIELD);//重力感应传感器

put(R.id.sensor_orient, SensorManager.SENSOR_ORIENTATION);//方向感应传感器

put(R.id.sensor_prox, SensorManager.SENSOR_PROXIMITY);//临近性传感器

put(R.id.sensor_temp, SensorManager.SENSOR_TEMPERATURE);//温度传感器SensorListener接口，有两个方法：

abstract void onAccuracyChanged(int sensor, int accuracy)

当传感器的精确数值发生改变时调用。

abstract void onSensorChanged(int sensor, float[] values)：当传感器的值发生改变时调用

如何实现sensor编程：

1、//获得SensorManager对象

        SensorManager sensors = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
     2、.通过SensorManager对象获取Sensor对象，
           sensorObject = sensormanager.getDefaultSensor(sensor Type);
     3.实现SensorListener接口或者是申明一个SensorEventListener对象用于侦听Sensor事件，并实现或重载onSensorChanged方法
           SensorEventListenersensorListener = new SensorEventListener(){
            };

或：onSensorChanged(int sensor, float[] values) {
4.注册相应的SensorService
sensormanager.registerListener(sensorListener, sensorObject, Sensor TYPE);

sensorObject就是上面的六种类型
    5.销毁相应的SensorService
            sensormanager.unregisterListener(sensorListener, sensorObject);

    6: SensorListener 接口是传感器应用程序的中心。它包括两个必需方法：
　　        onSensorChanged(int sensor,float values[])方法在传感器值更改时调用。

Battery：

package com.androidbook.hardware;

import java.util.HashMap;

import java.util.Map;

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.BatteryManager;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

public class Battery extends Activity {

private BroadcastReceiver batteryRcv = null;

private static final Map<Integer, String> healthValueMap = new HashMap<Integer, String>() {

{

put(BatteryManager.BATTERY_HEALTH_DEAD, "Dead");

put(BatteryManager.BATTERY_HEALTH_GOOD, "Good");

put(BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE, "Over voltage");

put(BatteryManager.BATTERY_HEALTH_OVERHEAT, "Over heating");

put(BatteryManager.BATTERY_HEALTH_UNKNOWN, "Unknown");

put(BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE, "Failure, but unknown");

put(-1, "Not Reported");

}

};

private static final Map<Integer, String> statusValueMap = new HashMap<Integer, String>() {

{

put(BatteryManager.BATTERY_STATUS_CHARGING, "Charging");

put(BatteryManager.BATTERY_STATUS_DISCHARGING, "Discharging");

put(BatteryManager.BATTERY_STATUS_FULL, "Full");

put(BatteryManager.BATTERY_STATUS_NOT_CHARGING, "Not Charging");

put(BatteryManager.BATTERY_STATUS_UNKNOWN, "Unknown");

put(-1, "Not Reported");

}

};

private static final Map<Integer, String> pluggedValueMap = new HashMap<Integer, String>() {

{

put(BatteryManager.BATTERY_PLUGGED_AC, "On AC");

put(BatteryManager.BATTERY_PLUGGED_USB, "On USB");

put(-1, "Not Reported");

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.battery);

final ImageView icon = (ImageView) findViewById(R.id.icon);

final Button start = (Button) findViewById(R.id.start);

final Button stop = (Button) findViewById(R.id.stop);

final TextView status = (TextView) findViewById(R.id.status);

batteryRcv = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

int level = intent.getIntExtra("level", -1);

int maxValue = intent.getIntExtra("scale", -1);

int batteryStatus = intent.getIntExtra("status", -1);

int batteryHealth = intent.getIntExtra("health", -1);

int batteryPlugged = intent.getIntExtra("plugged", -1);

String batteryTech = intent.getStringExtra("technology");

int batteryIcon = intent.getIntExtra("icon-small", -1);

float batteryVoltage = (float) intent.getIntExtra("voltage", -1) / 1000;

boolean battery = intent.getBooleanExtra("present", false);

float batteryTemp = (float) intent.getIntExtra("temperature", -1) / 10;

/* used to determine keys and types

* Bundle extras = intent.getExtras(); Set<String> keys =

* extras.keySet(); Iterator<String> allKeys = keys.iterator();

* while (allKeys.hasNext()) { String key = allKeys.next();

* Log.v("Battery", key); }

int chargedPct = (level * 100) / maxValue;

String batteryInfo = "Battery Info:\nHealth=" + healthValueMap.get(batteryHealth) + "\n" + "Status=" + statusValueMap.get(batteryStatus) + "\n" + "Charged % = "

+ chargedPct + "%\n" + "Plugged = " + pluggedValueMap.get(batteryPlugged) + "\n" + "Type = " + batteryTech + "\n" + "Voltage = " + batteryVoltage

+ " volts\n" + "Temperature = " + batteryTemp + "\n" + "Battery present = " + battery + "\n";

status.setText(batteryInfo);

icon.setImageResource(batteryIcon);

Toast.makeText(Battery.this, "Battery state changed", Toast.LENGTH_LONG).show();

}

};

start.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

//注册广播，过滤条件是电池状态改变时就发送广播

registerReceiver(batteryRcv, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

Toast.makeText(Battery.this, "Battery monitoring started", Toast.LENGTH_SHORT).show();

start.setVisibility(View.GONE);

stop.setVisibility(View.VISIBLE);

}

});

stop.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

unregisterReceiver(batteryRcv);

Toast.makeText(Battery.this, "Battery monitoring stopped", Toast.LENGTH_SHORT).show();

stop.setVisibility(View.GONE);

start.setVisibility(View.VISIBLE);

}

});

}

@Override

protected void onPause() {

if (batteryRcv != null) {

unregisterReceiver(batteryRcv);

batteryRcv = null;

}

super.onPause();

}