hzuapps#94 hzuapps#20 lab8 与硬件相关的功能：位置

app/src/main/java/edu/hzuapps/androidworks/homeworks/net1314080903234/Net1314080903234GPSLocation.java

@@ -0,0 +1,279 @@
+package edu.hzuapps.androidworks.homeworks.Net134080903234;
+
+import android.app.Activity;
+import android.app.ListActivity;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.location.Criteria;
+import android.location.GpsSatellite;
+import android.location.GpsStatus;
+import android.location.Location;
+import android.location.LocationListener;
+import android.location.LocationManager;
+import android.location.LocationProvider;
+import android.os.Bundle;
+import android.provider.Settings;
+import android.util.Log;
+import android.view.View;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ListView;
+import android.widget.SimpleCursorAdapter;
+import android.widget.Toast;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Iterator;
+
+public class Net1314080903234GPSLocation extends ListActivity {
+
+    private EditText editText;
+    private LocationManager lm;
+    private SQLiteDatabase dbRead,dbWrite;
+    private Db db;
+    private SimpleCursorAdapter adapter;
+    private Button button;
+    private static final String TAG="GpsActivity";
+
+    //获取当前时间
+    SimpleDateFormat formatter= new SimpleDateFormat ("yyyy.MM.dd HH:mm:ss");
+    Date curDate  = new Date(System.currentTimeMillis());
+    String str = formatter.format(curDate);
+
+    //设置按钮
+    private View.OnClickListener btnListener= new View.OnClickListener() {
+        @Override
+        public void onClick(View v) {
+            if(getListView().getVisibility()==View.VISIBLE) {
+                Toast.makeText(getApplicationContext(),"显示历史记录",Toast.LENGTH_SHORT).show();
+                setListAdapter(adapter);
+                refresh();
+            }
+
+
+        }
+    };
+
+
+
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        button= (Button) findViewById(R.id.button);
+        button.setOnClickListener(btnListener);
+
+
+        //读数据库
+        db =new Db(this);
+        dbRead = db.getReadableDatabase();
+        dbWrite=db.getWritableDatabase();
+
+        adapter = new SimpleCursorAdapter(this,R.layout.where_you,null,
+                new String[]{"longitude","latitude"},
+                new int[]{R.id.tvLong,R.id.tvLat});
+//        setListAdapter(adapter);
+//        refresh();
+
+
+
+
+        editText=(EditText)findViewById(R.id.editText);
+        lm=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
+
+        //判断GPS是否正常启动
+        if(!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){
+            Toast.makeText(this, "请开启GPS导航...", Toast.LENGTH_SHORT).show();
+            //返回开启GPS导航设置界面
+            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
+            startActivityForResult(intent,0);
+            return;
+        }
+
+        //为获取地理位置信息时设置查询条件
+        String bestProvider = lm.getBestProvider(getCriteria(), true);
+        //获取位置信息
+        //如果不设置查询要求，getLastKnownLocation方法传人的参数为LocationManager.GPS_PROVIDER
+        Location location= lm.getLastKnownLocation(bestProvider);
+        updateView(location);
+        //监听状态
+        lm.addGpsStatusListener(listener);
+        //绑定监听，有4个参数
+        //参数1，设备：有GPS_PROVIDER和NETWORK_PROVIDER两种
+        //参数2，位置信息更新周期，单位毫秒
+        //参数3，位置变化最小距离：当位置距离变化超过此值时，将更新位置信息
+        //参数4，监听
+        //备注：参数2和3，如果参数3不为0，则以参数3为准；参数3为0，则通过时间来定时更新；两者为0，则随时刷新
+
+        // 1秒更新一次，或最小位移变化超过1米更新一次；
+        //注意：此处更新准确度非常低，推荐在service里面启动一个Thread，在run中sleep(10000);然后执行handler.sendMessage(),更新位置
+        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
+    }
+
+    //位置监听
+    private LocationListener locationListener=new LocationListener() {
+
+        /**
+         * 位置信息变化时触发
+         */
+             public void onLocationChanged(Location location) {
+            updateView(location);
+
+                 ContentValues cv = new ContentValues();
+                 cv.put("longitude",String.valueOf(location.getLongitude()));
+                 cv.put("latitude", String.valueOf(location.getLatitude()));
+                 dbWrite.insert("whereYou", null, cv);
+                 refresh();
+
+
+
+
+//
+//            Log.i(TAG, "时间：" + location.getTime());
+//            Log.i(TAG, "经度："+location.getLongitude());
+//            Log.i(TAG, "纬度："+location.getLatitude());
+//            Log.i(TAG, "海拔："+location.getAltitude());
+        }
+
+        /**
+         * GPS状态变化时触发
+         */
+        public void onStatusChanged(String provider, int status, Bundle extras) {
+            switch (status) {
+                //GPS状态为可见时
+                case LocationProvider.AVAILABLE:
+                    Log.i(TAG, "当前GPS状态为可见状态");
+                    break;
+                //GPS状态为服务区外时
+                case LocationProvider.OUT_OF_SERVICE:
+                    Log.i(TAG, "当前GPS状态为服务区外状态");
+                    break;
+                //GPS状态为暂停服务时
+                case LocationProvider.TEMPORARILY_UNAVAILABLE:
+                    Log.i(TAG, "当前GPS状态为暂停服务状态");
+                    break;
+            }
+        }
+
+        /**
+         * GPS开启时触发
+         */
+        public void onProviderEnabled(String provider) {
+            Location location=lm.getLastKnownLocation(provider);
+            updateView(location);
+        }
+
+        /**
+         * GPS禁用时触发
+         */
+        public void onProviderDisabled(String provider) {
+            updateView(null);
+        }
+
+
+    };
+
+    //状态监听
+    GpsStatus.Listener listener = new GpsStatus.Listener() {
+        public void onGpsStatusChanged(int event) {
+            switch (event) {
+                //第一次定位
+                case GpsStatus.GPS_EVENT_FIRST_FIX:
+                    Log.i(TAG, "第一次定位");
+                    break;
+                //卫星状态改变
+                case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
+                    Log.i(TAG, "卫星状态改变");
+                    //获取当前状态
+                    GpsStatus gpsStatus=lm.getGpsStatus(null);
+                    //获取卫星颗数的默认最大值
+                    int maxSatellites = gpsStatus.getMaxSatellites();
+                    //创建一个迭代器保存所有卫星
+                    Iterator<GpsSatellite> iters = gpsStatus.getSatellites().iterator();
+                    int count = 0;
+                    while (iters.hasNext() && count <= maxSatellites) {
+                        GpsSatellite s = iters.next();
+                        count++;
+                    }
+                    System.out.println("搜索到："+count+"颗卫星");
+                    break;
+                //定位启动
+                case GpsStatus.GPS_EVENT_STARTED:
+                    Log.i(TAG, "定位启动");
+                    break;
+                //定位结束
+                case GpsStatus.GPS_EVENT_STOPPED:
+                    Log.i(TAG, "定位结束");
+                    break;
+            }
+        };
+    };
+
+    /**
+     * 实时更新文本内容
+     *
+     * @param location
+     */
+    private void updateView(Location location){
+        if(location!=null){
+            editText.setText("位置信息\n\n经度：");
+            editText.append(String.valueOf(location.getLongitude()));
+            editText.append("\n纬度：");
+            editText.append(String.valueOf(location.getLatitude()));
+            editText.append("\n海拔：");
+            editText.append(String.valueOf(location.getAltitude()));
+
+
+
+            editText.append("\n时间：");
+            editText.append(str);
+
+
+        }else{
+            //清空EditText对象
+            editText.getEditableText().clear();
+        }
+    }
+
+    /**
+     * 返回查询条件
+     * @return
+     */
+    private Criteria getCriteria(){
+        Criteria criteria=new Criteria();
+        //设置定位精确度 Criteria.ACCURACY_COARSE比较粗略，Criteria.ACCURACY_FINE则比较精细
+        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);
+        //设置是否需要方位信息
+        criteria.setBearingRequired(false);
+        //设置是否需要海拔信息
+        criteria.setAltitudeRequired(false);
+        // 设置对电源的需求
+        criteria.setPowerRequirement(Criteria.POWER_LOW);
+        return criteria;
+    }
+
+    @Override
+    protected void onDestroy() {
+        // TODO Auto-generated method stub
+        super.onDestroy();
+        lm.removeUpdates(locationListener);
+    }
+
+    private void refresh(){
+        Cursor c= dbRead.query("whereYou", null, null, null, null, null, null);
+        adapter.changeCursor(c);
+    }
+
+
+}
+