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实验05-android-广播定位

程序员文章站 2022-07-03 17:49:43
实验目的1).静态注册:直接在AndroidManifest.xml文件中进行注册。2).动态注册:动态注册时,无须在AndroidManifest中注册组件。直接在代码中通过调用Context的registerReceiver函数动态注册广播。静态广播与动态广播的区别动态注册的广播永远要快于静态注册的广播,不管静态注册优先级设置的多高,不管动态注册的优先级有多低,在同一个优先级下,谁先启动的快,谁将先接收到广播动态注册广播不是常驻型广播,也就是广播跟随activity的省命周期...

实验目的

实验05-android-广播定位
1).静态注册:直接在AndroidManifest.xml文件中进行注册。
2).动态注册:动态注册时,无须在AndroidManifest中注册组件。直接在代码中通过调用Context的registerReceiver函数动态注册广播。

实验05-android-广播定位

静态广播与动态广播的区别

  1. 动态注册的广播永远要快于静态注册的广播,不管静态注册优先级设置的多高,不管动态注册的优先级有多低,

  2. 在同一个优先级下,谁先启动的快,谁将先接收到广播

  3. 动态注册广播不是常驻型广播,也就是广播跟随activity的省命周期(在Activity结束前,移除广播接收器),静态注册是常驻型,也就是说当前应用程序关闭后,如果有信息广播来,程序也会被系统调用自动运行,

  4. PendingIntent是一个特殊的Intent,主要区别是Intent是立马执行,PendingIntent是待确定的Intent

  5. PendingIntent的实际操作上是传入的Intent的操作,使用PendingIntent的目的主要是用于所包含的intent是否满足某些条件
    获取PendingIntent有三种方式:

  6. getActivity(Context context, int requestCode, Intent intent, int flags)

  7. getService(Context context, int requestCode, Intent intent, int flags)

  8. getBroadCast(Context context, int requestCode, Intent intent, int flags)

PendingIntent的flags参数

  1. FLAG_CANCEL_CURRENT
  2. FLAG_UPDATE_CURRENT
  3. FLAG_NO_CREATE
  4. FLAG_ONE_SHOT

LocationManager常量可在Intent中携带。
1、LocationManager.KEY_LOCATION_CHANGED
2、LocationManager.KEY_PROVIDER_ENABLED
3、LocationManager.KEY_PROXIMITY_ENTERING
4、LocationManager.KEY_STATUS_CHANGED

1、requestLocationUpdates(provider,time,dis,listenter);
2、 requestLocationUpdates(provider,time,dis,PendingIntent);

新建一个Android项目
AndroidManifest.xml添加权限

<uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission  android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FIND_LOCATION"/>
    <uses-permission android:name="android.permission.BROADCAST_SMS"/>

LocationReceiver.java

package com.example.lu01_week10_brocast;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.util.Log;

public class LocationReceiver extends BroadcastReceiver{
	public final String TAG = "LocationReceiver";

	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		Location location = intent.getParcelableExtra(LocationManager.KEY_LOCATION_CHANGED);
		if(location != null){
			onLocationReceived(context,location);
		}if(intent.hasExtra(LocationManager.KEY_PROVIDER_ENABLED)){
			boolean enabled = intent.getBooleanExtra(LocationManager.KEY_PROVIDER_ENABLED, false);
			onProviderEnabledChanged(enabled);
		}
	}

	private void onProviderEnabledChanged(boolean enabled) {
		Log.v(TAG, "Provider"+(enabled ? "enabled":"disabled"));
		
	}
	private void onLocationReceived(Context context, Location location) {
		// TODO Auto-generated method stub
		Log.v(TAG, this+"Got location from"+location.getProvider()+":"+location.getLatitude()+","+location.getLongitude());
		
	}
}

MainActivity.java

package com.example.lu01_week10_brocast;

import java.io.IOException;
import java.util.List;
import java.util.Locale;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;



public class MainActivity extends Activity{
String action = "com.example.lu01_week10_brocast";
TextView textView;
Button start,stop;
LocationManager locationManager;
Location mLastlocation;

private BroadcastReceiver mBroadcastReceiver = new LocationReceiver(){
	private void onLocationReceived(Location location) {
		// TODO Auto-generated method stub
		mLastlocation= location;
		updateTextView(mLastlocation);
	}
private void onProviderEnabledChanged(boolean enabled) {
//	Gps服务提供者启动或停止时,消息提示
	String toastText = enabled?"gps_enabled":"gps_disabled";
	Toast.makeText(MainActivity.this, toastText, Toast.LENGTH_LONG).show();
}
};

protected void onCreate(android.os.Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	textView= (TextView) findViewById(R.id.TextView);
	start = (Button) findViewById(R.id.start);
	stop= (Button) findViewById(R.id.stop);
	locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
	start.setOnClickListener(new OnClickListener() {
		
		@Override
		public void onClick(View arg0) {
			startLocationupdates();
		}
	});
	stop.setOnClickListener(new OnClickListener() {
		
		@Override
		public void onClick(View arg0) {
			stopLocationUpdates();
			
		}
	});	
};
protected void stopLocationUpdates() {
	PendingIntent pi = getLocationPendingIntent(false);
	if(pi != null){
		locationManager.removeUpdates(pi);
		pi.cancel();
		textView.setText("stop listener");
		Toast.makeText(MainActivity.this, "pi canceled", 2000).show();
	}	
}
protected void startLocationupdates() {
	// 要求LocationManager通过GPS或NETWORK定位装置提供实时的定位数据更新
	String bestProvider = locationManager.getBestProvider(getCriteria(), true);
//	获取最近一次地理位置信息,避免用户开启定位时的长时间等待,
	Location LastKnownLocation = locationManager.getLastKnownLocation(bestProvider);
	updateTextView(LastKnownLocation);
	if(LastKnownLocation != null){
		broadcastLocation(LastKnownLocation);
	}
	PendingIntent pi = getLocationPendingIntent(true);
	locationManager.requestLocationUpdates(bestProvider, 1, 1, pi);
	
}
//发送最近一次地理位置信息的广播
private PendingIntent getLocationPendingIntent( boolean shouldCreate) {
	Intent broacast = new Intent(action);
	int flags = shouldCreate ? 0:PendingIntent.FLAG_NO_CREATE;
	return PendingIntent.getBroadcast(MainActivity.this, 0, broacast, PendingIntent.FLAG_CANCEL_CURRENT);
}
private void start() {
	// TODO Auto-generated method stub
String bestProvider = locationManager.getBestProvider(getCriteria(),true);
Location location = locationManager.getLastKnownLocation(bestProvider);

updateTextView(location);
if(location != null){
	broadcastLocation(location);
}
PendingIntent pi = getLocationPendingIntent();
locationManager.requestLocationUpdates(bestProvider, 0, 0, pi);
}

private PendingIntent getLocationPendingIntent() {
	Intent intent = new Intent(action);
	PendingIntent.getBroadcast(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
	return null;
}


private void broadcastLocation(Location location) {
	Intent intent = new Intent(action);
	intent.putExtra(LocationManager.KEY_LOCATION_CHANGED,location );
	sendBroadcast(intent);
}
private Criteria getCriteria() {
//设置Criteria
	Criteria criteria= new Criteria();
	criteria.setAccuracy(Criteria.ACCURACY_FINE);
//	设置是否要求速度
	criteria.setSpeedRequired(false);
//	设置是否允许运营商收费
	criteria.setCostAllowed(false);
//	设置是否需要方位消息
	criteria.setBearingRequired(false);
//	设置是否需要海拔消息
	criteria.setAltitudeRequired(false);
//	设置对电源的需求
	criteria.setPowerRequirement(Criteria.POWER_LOW);
	
	return criteria;
}
private void updateTextView(Location location) {
	// TODO Auto-generated method stub	// TODO Auto-generated method stub
//	Address address = getAddress( this,location);
	StringBuilder stringBuilder = new StringBuilder();
	if(location !=null){
		stringBuilder.append("当前经度是:"+location.getLongitude()+"\n");
		stringBuilder.append("当前纬度是"+location.getLatitude()+"\n");
		stringBuilder.append("当前海拔是"+location.getAltitude()+"\n");
		stringBuilder.append("当前时间是"+location.getTime()+"\n");
//		stringBuilder.append("当前国家是"+address.getCountryName()+"\n");
//		stringBuilder.append("当前省份是"+address.getAdminArea()+"\n");
		
		textView.setText(stringBuilder.toString());
	}else {
		textView.setTag("location is null");
	}
	
}

private Address getAddress(Context context,Location location) {
	// TODO Auto-generated method stub
	Geocoder gecoder= new Geocoder(context,Locale.getDefault());
	try {
		List<Address> lists = gecoder.getFromLocation(location.getLongitude(), location.getLatitude(), 1);
		if(lists.size() >0){
			return lists.get(0);
		}
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	return null;

}


}



实验结果:

实验05-android-广播定位
stop后
实验05-android-广播定位

项目需要注意添加权限,Criteria用于找到合适的地理位置提供者,有三种:gps,移动网络,主动发送位置
静态广播是在配置文件AndroidManifest.xml进行注册,常驻内存的广播
动态广播是在代码里面注册,内存是随着应用程序的结束而结束

PendingIntent是Intent的特殊形式,两者没有太大的变化

本文地址:https://blog.csdn.net/weixin_44123412/article/details/107493316

相关标签: 基于android的定位