Question

执行此操作＆＃34;定位＆＃34;按钮，我希望我的地图从MainActivity.java中的btnShowLoc函数获取输入值并显示相同的内容。

activity_main.xml中

        <Button
        android:onClick="btnShowLoc"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Locate" />

    <fragment
        android:id="@+id/map"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:android="http://schemas.android.com/apk/res/android"
        class="com.google.android.gms.maps.MapFragment"
        android:layout_width="350dp"
        android:layout_height="230dp"
        tools:context=".MapLocationActivity"
        tools:layout="@layout/activity_main" />

MainActivity.java

    public void btnShowLoc(View view) {
        EditText txtLat = (EditText) findViewById(R.id.txtLat);
        EditText txtLong = (EditText) findViewById(R.id.txtLong);

//Need instruction about how to call MapActivity.java
    }


MapActivity.java

public class MapActivity extends FragmentActivity implements OnMapReadyCallback {
    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        MapFragment map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map));
        map.getMapAsync(this);
    }


    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        LatLng Device = new LatLng(28.7041, 77.1025);
        mMap.addMarker(new MarkerOptions().position(Device).title("Device Location"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(Device));
        mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        mMap.setTrafficEnabled(true);
        mMap.setIndoorEnabled(true);
        mMap.setBuildingsEnabled(true);
        mMap.getUiSettings().setZoomControlsEnabled(true);
    }

Answer 1

使用 Intent 开始 MapActivity

Intent 是要执行的操作的抽象描述。它可以与startActivity一起使用来启动Activity，broadcastIntent可以将它发送到任何感兴趣的BroadcastReceiver组件，startService（Intent）或bindService（Intent，ServiceConnection，int）可以与后台服务进行通信。

尝试此操作首先使用Intent将您的纬度和纬度发送到 MapActivity ，如下面的代码

Intent i = new Intent(HotelDetailsClass.this, MapActivity.class);
i.putExtra("latitude","28.7041")
i.putExtra("longitude","77.1025");
startActivity(i);

现在在 MapActivity

中添加此代码

Double latitude, longitude;
Intent i = getIntent();
latitude = Double.valueOf(i.getStringExtra("latitude"));
longitude = Double.valueOf(i.getStringExtra("longitude"));

现在加载地图

 @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        // Add a marker in Location and move the camera
        LatLng location = new LatLng(latitude, longitude);
        mMap.addMarker(new MarkerOptions().position(location).title(title));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(location));
        mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude, longitude), 14.0f));


    }

如何在单击按钮时从MainActivity.java调用MapActivity.java

1 个答案: