android 搜索Provider

首先在Mainifest.xml获取gps设备的权限

不然的话即使你搜索不到bestProvider

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.lichen"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".MainActivity"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/></manifest> 

布局main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    />    <Button     android:id="@+id/ScanProvidersButton"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="测试当前设备的Providers"/>    <Button     android:id="@+id/bestProviderButton"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="最好的Provider"/></LinearLayout>

java

package com.lichen;import java.util.Iterator;import java.util.List;import android.app.Activity;import android.content.Context;import android.location.Criteria;import android.location.LocationManager;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity {private Button scanProvider = null;private Button bestProvider = null;private LocationManager locationManager = null;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                //位置管理器    locationManager = (LocationManager) MainActivity.this.getSystemService(Context.LOCATION_SERVICE);    //两个按钮，一个用来搜索Provider，一个用来搜索最好的ProviderscanProvider = (Button) findViewById(R.id.ScanProvidersButton);bestProvider = (Button) findViewById(R.id.bestProviderButton);//遍历Provider，打印到控制台（）当中的是一个监听器scanProvider.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// 得到所有的provider，返回的是一个存放String的ListList<String> providers = locationManager.getAllProviders();System.out.println("providers:");for (Iterator<String> it = providers.iterator(); it.hasNext();) {String provider = (String) it.next();System.out.println("=============" + provider);}}});//用来输出最好的ProviderbestProvider.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {Criteria criteria = new Criteria();// 设置查找最好的provider的过滤条件criteria.setAccuracy(Criteria.ACCURACY_FINE);criteria.setSpeedRequired(false);criteria.setCostAllowed(false);// 获得最好的provider，第二个参数表示是否考虑provider可用String provider = locationManager.getBestProvider(criteria,false);System.out.println("best provider ---> " + provider);}});    }}