Android将定位服务封装为Service
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MainActivity.java
public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button startService; private Button stopService; private EditText editText=null; private MyReceiver receiver=null; private EditText username, password, positionName; private SQLiteDatabase DB; private ListView values; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); username = (EditText) findViewById(R.id.username); password = (EditText) findViewById(R.id.userpwd); positionName = (EditText) findViewById(R.id.positionName); values = (ListView) findViewById(R.id.values_list); DB = SQLiteDatabase.openOrCreateDatabase(getFilesDir() + "/info.db", null); editText=(EditText)findViewById(R.id.editText); startService = (Button) findViewById(R.id.start_service); stopService = (Button) findViewById(R.id.stop_service); startService.setOnClickListener(this); stopService.setOnClickListener(this); // 长按删除 values.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // 获取所点击项的_id TextView tv = (TextView) arg1.findViewById(R.id.tv_id); final String id = tv.getText().toString(); // 通过Dialog提示是否删除 AlertDialog.Builder builder = new AlertDialog.Builder( MainActivity.this); builder.setMessage("确定要删除吗？"); // 确定按钮点击事件 builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { delete(id); replaceList();// 删除后刷新列表 } }); // 取消按钮点击事件 builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); builder.create().show(); return true; } }); // 点击更新 values.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // 获取_id,username,password项 TextView tvId = (TextView) arg1.findViewById(R.id.tv_id); TextView tvName = (TextView) arg1 .findViewById(R.id.tv_username); TextView tvPass = (TextView) arg1 .findViewById(R.id.tv_password); TextView tvPName = (TextView) arg1 .findViewById(R.id.tv_positionName); final String id = tvId.getText().toString(); String username = tvName.getText().toString(); String password = tvPass.getText().toString(); String positionName = tvPName.getText().toString(); // 通过Dialog弹出修改界面 AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("修改"); // 自定义界面包括两个文本输入框 View v = View.inflate(MainActivity.this, R.layout.alertdialog, null); final EditText etName = (EditText) v .findViewById(R.id.alert_name); final EditText etPass = (EditText) v .findViewById(R.id.alert_pass); final EditText etPName = (EditText) v .findViewById(R.id.alert_positionName); // Dialog弹出就显示原内容 etName.setText(username); etPass.setText(password); etPName.setText(positionName); builder.setView(v); // 确定按钮点击事件 builder.setPositiveButton("保存", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { String newName = etName.getText().toString(); String newPass = etPass.getText().toString(); String newPName = etPName.getText().toString(); updata(newName, newPass, id, newPName); replaceList();// 更新后刷新列表 } }); // 取消按钮点击事件 builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); builder.create().show(); } }); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.start_service: Intent startIntent = new Intent(this, MyService.class); startService(startIntent); // 启动服务 //注册广播接收器 receiver=new MyReceiver(); IntentFilter filter=new IntentFilter(); filter.addAction("com.example.liwenxiao.myservice"); MainActivity.this.registerReceiver(receiver,filter); break; case R.id.stop_service: Intent stopIntent = new Intent(this, MyService.class); stopService(stopIntent); // 停止服务 username.setText(""); password.setText(""); positionName.setText(""); editText.setText(""); break; default: break; } } //获取广播数据 public class MyReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Bundle bundle=intent.getExtras(); Double latitude=bundle.getDouble("latitude"); Double longitude=bundle.getDouble("longitude"); editText.setText(latitude + " "+longitude); username.setText(latitude+""); password.setText(longitude+""); } } /** * 关闭程序关闭数据库 */ @Override protected void onDestroy() { super.onDestroy(); DB.close(); } /** * 保存按钮点击事件，首次插入由于没有表必然报错，简化程序利用try-catch在catch中创建表 */ public void save(View v) { String name = username.getText().toString(); String pass = password.getText().toString(); String pName = positionName.getText().toString(); try { insert(name, pass, pName); } catch (Exception e) { create(); insert(name, pass, pName); } Toast.makeText(this, "Save Success", Toast.LENGTH_SHORT).show(); // username.setText(""); // password.setText(""); // positionName.setText(""); } /** * 读取按钮点击事件，以列表的形式显示所有内容 */ public void read(View v) { replaceList(); } /** * ListView的适配器 */ public void replaceList() { Cursor cursor = select(); SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.values_item, cursor, new String[]{"_id", "positionName", "username", "password"}, new int[]{R.id.tv_id, R.id.tv_positionName, R.id.tv_username, R.id.tv_password}, SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER); values.setAdapter(adapter); } /** * 建表 */ public void create() { String createSql = "create table loction(_id integer primary key autoincrement,username,password,positionName)"; DB.execSQL(createSql); } /** * 插入 */ public void insert(String username, String password, String positionName) { String insertSql = "insert into loction(username,password,positionName) values(?,?,?)"; DB.execSQL(insertSql, new String[]{username, password, positionName}); } /** * 查询 */ public Cursor select() { String selectSql = "select _id,username,password,positionName from loction"; Cursor cursor = DB.rawQuery(selectSql, null);// 我们需要查处所有项故不需要查询条件 return cursor; } /** * 删除 */ public void delete(String id) { String deleteSql = "delete from loction where _id=?"; DB.execSQL(deleteSql, new String[]{id}); } /** * 更新 */ public void updata(String username, String password, String id, String positionName) { String updataSql = "update loction set username=?,password=? ,positionName=? where _id=?"; DB.execSQL(updataSql, new String[]{username, password, positionName, id}); }}MyService.java
import android.Manifest;import android.app.Service;import android.content.Context;import android.content.Intent;import android.content.pm.PackageManager;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Binder;import android.os.Bundle;import android.os.IBinder;import android.support.annotation.Nullable;import android.support.v4.app.ActivityCompat;import android.util.Log;import android.widget.Toast;import java.util.List;/** * Created by LiWenxiao on 2017/4/19. */public class MyService extends Service { private LocationManager locationManager; private String provider; @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { locationManager = (LocationManager) getSystemService(Context. LOCATION_SERVICE); // 获取所有可用的位置 供器 List<String> providerList = locationManager.getProviders(true); if (providerList.contains(LocationManager.GPS_PROVIDER)) { provider = LocationManager.GPS_PROVIDER; } else if (providerList.contains(LocationManager.NETWORK_PROVIDER)) { provider = LocationManager.NETWORK_PROVIDER; } else { // 当没有可用的位置 供器时，弹出Toast 示用户 Toast.makeText(this, "No location provider to use", Toast.LENGTH_SHORT).show(); return; } if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // ActivityCompat#requestPermissions // here to request the missing permissions, and then overriding // public void onRequestPermissionsResult(int requestCode, String[] permissions, // int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for ActivityCompat#requestPermissions for more details. return; } Location location = locationManager.getLastKnownLocation(provider); if (location != null) { // 显示当前设备的位置信息 // 发送广播 Intent intent = new Intent(); Double latitude=location.getLatitude(); Double longitude=location.getLongitude(); intent.putExtra("latitude", latitude); intent.putExtra("longitude",longitude); intent.setAction("com.example.liwenxiao.myservice"); sendBroadcast(intent); } locationManager.requestLocationUpdates(provider, 1000, 1, locationListener); } LocationListener locationListener = new LocationListener() { @Override public void onStatusChanged(String provider, int status, Bundle extras) { } @Override public void onProviderEnabled(String provider) { } @Override public void onProviderDisabled(String provider) { } @Override public void onLocationChanged(Location location) { // 更新当前设备的位置信息 // 发送广播 Intent intent = new Intent(); Double latitude=location.getLatitude(); Double longitude=location.getLongitude(); intent.putExtra("latitude", latitude); intent.putExtra("longitude",longitude); intent.setAction("com.example.liwenxiao.myservice"); sendBroadcast(intent); } }; @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.d("MyService", "onStartCommand executed"); return super.onStartCommand(intent, flags, startId); } @Override public void onDestroy() { super.onDestroy(); if (locationManager != null) { // 关闭程序时将监听器移除 if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // ActivityCompat#requestPermissions // here to request the missing permissions, and then overriding // public void onRequestPermissionsResult(int requestCode, String[] permissions, // int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for ActivityCompat#requestPermissions for more details. return; } locationManager.removeUpdates(locationListener); } Log.d("MyService", "onDestroy executed"); }}清单文件
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.liwenxiao.myservice"> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <service android:name=".MyService" > </service> </application> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /></manifest>布局文件
activity_main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:cursorVisible="false" android:editable="false" android:id="@+id/editText"/> <Button android:id="@+id/start_service" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Start Service" /> <Button android:id="@+id/stop_service" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Stop Service" /> <EditText android:id="@+id/positionName" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="PositionName" /> <EditText android:id="@+id/username" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="Latitude" /> <EditText android:id="@+id/userpwd" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="Longitude" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="save" android:text="SAVE" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="read" android:text="READ" /> <ListView android:id="@+id/values_list" android:layout_width="match_parent" android:layout_height="wrap_content" /></LinearLayout>alertdialog.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="PositionName" /> <EditText android:id="@+id/alert_positionName" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Latitude" /> <EditText android:id="@+id/alert_name" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Longitude" /> <EditText android:id="@+id/alert_pass" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout></LinearLayout>values_item.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > <TextView android:id="@+id/tv_id" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:visibility="gone" /> <TextView android:id="@+id/tv_positionName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:textSize="20sp" /> <TextView android:id="@+id/tv_username" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dp" android:textSize="20sp" /> <TextView android:id="@+id/tv_password" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:textSize="20sp" /></LinearLayout> 0 0
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