Android基礎（十一）基於位置的開發（百度地圖相關）

API_KEY

 

即在百度地圖開發平臺註冊成爲開發者，要注意測試用的SHA1與編譯器的保持一致，正式線上的SHAI填寫參考官方開發文檔。，

 

定位問題

 

主要注意權限的獲取，以及定位的關閉（節省點亮等資源）

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="www.yfg.com.lbstest">

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <!--<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>-->
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <meta-data
            android:name="com.baidu.lbsapi.API_KEY"
            android:value="ogggjmZ2C7QWonqbeBA1206GAPvXAYdS" />
        <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="com.baidu.location.f"
            android:enabled="true"
            android:process=":remote" />
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/tv_position"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        />
    <com.baidu.mapapi.map.MapView
        android:id="@+id/mapview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true">

    </com.baidu.mapapi.map.MapView>

</LinearLayout>

package www.yfg.com.lbstest;

import android.Manifest;
import android.content.pm.PackageManager;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.baidu.location.BDLocation;
import com.baidu.location.BDLocationListener;
import com.baidu.location.LocationClient;
import com.baidu.location.LocationClientOption;
import com.baidu.mapapi.SDKInitializer;
import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.MapStatusUpdate;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.MyLocationData;
import com.baidu.mapapi.model.LatLng;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private LocationClient mLocationClient;
    private TextView mTvPosition;
    private MapView mMapView;

    private BaiduMap mBaiduMap;
    private Boolean isFirstLoction = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SDKInitializer.initialize(getApplicationContext());
        setContentView(R.layout.activity_main);


        mLocationClient = new LocationClient(getApplicationContext());
        mLocationClient.registerLocationListener(new MyLocationListener());

        mTvPosition = findViewById(R.id.tv_position);
        mMapView = findViewById(R.id.mapview);
        mBaiduMap = mMapView.getMap();
        mBaiduMap.setMyLocationEnabled(true);
        List<String> permissionList = new ArrayList<>();
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.ACCESS_FINE_LOCATION);
        }
        //這個權限請忽略，否則程序運行不起來
//        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
//            permissionList.add(Manifest.permission.READ_PHONE_STATE);
//        }
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }

        if (!permissionList.isEmpty()) {
            String[] permissions = permissionList.toArray(new String[permissionList.size()]);
            ActivityCompat.requestPermissions(MainActivity.this, permissions, 1);
        } else {
            requestLocation();
        }

    }
    private void navigateTo(BDLocation bdLocation) {
        if (isFirstLoction){
            LatLng latLng = new LatLng(bdLocation.getLatitude(),bdLocation.getLongitude());
            MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(latLng);
            mBaiduMap.animateMapStatus(update);
            update = MapStatusUpdateFactory.zoomTo(16f);
            mBaiduMap.animateMapStatus(update);
            isFirstLoction = false;
        }
        MyLocationData.Builder builder = new MyLocationData.Builder();
        builder.latitude(bdLocation.getLatitude());
        builder.longitude(bdLocation.getLongitude());
        MyLocationData myLocationData = builder.build();
        mBaiduMap.setMyLocationData(myLocationData);

    }

    private void requestLocation() {
        initLocation();
        mLocationClient.start();
    }

    private void initLocation() {
        LocationClientOption option = new LocationClientOption();
        option.setScanSpan(1000);
        option.setLocationMode(LocationClientOption.LocationMode.Device_Sensors);
        option.setIsNeedAddress(true);
        mLocationClient.setLocOption(option);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0) {
                    for (int result : grantResults) {
                        if (result != PackageManager.PERMISSION_GRANTED) {
                            Toast.makeText(this, "必須要權限", Toast.LENGTH_SHORT).show();
                            finish();
                            return;
                        }
                    }
                    requestLocation();
                } else {
                    Toast.makeText(this, "未知錯誤", Toast.LENGTH_SHORT).show();
                    finish();
                }
                break;
            default:
                break;
        }
    }

    public class MyLocationListener implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation bdLocation) {
            StringBuilder currentPosition = new StringBuilder();
            currentPosition.append("維度：").append(bdLocation.getLatitude()).append("\n");
            currentPosition.append("經度：").append(bdLocation.getLongitude()).append("\n");
            currentPosition.append("國家：").append(bdLocation.getCountry()).append("\n");
            currentPosition.append("省：").append(bdLocation.getProvince()).append("\n");
            currentPosition.append("市：").append(bdLocation.getCity()).append("\n");
            currentPosition.append("區：").append(bdLocation.getDistrict()).append("\n");
            currentPosition.append("定位方式：");
            if (bdLocation.getLocType() == BDLocation.TypeGpsLocation) {
                currentPosition.append("GPS");
                navigateTo(bdLocation);
            } else if (bdLocation.getLocType() == BDLocation.TypeNetWorkLocation) {
                currentPosition.append("網絡");
                navigateTo(bdLocation);
            }
            mTvPosition.setText(currentPosition);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        mMapView.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        mMapView.onPause();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mLocationClient.stop();
        mMapView.onDestroy();
        mBaiduMap.setMyLocationEnabled(false);
    }
}

更多內容

 

還是直接看官網研究