Question

我是Android开发的新手，我遇到了问题。

我创建了空活动项目，该项目成为主要项目。接下来我添加了第二项活动 - 谷歌地图。接下来，我使用<include/>标记将地图活动包含在主要活动中：

<include
    layout="@layout/activity_maps" />

当我启动我的应用程序时，会显示maps活动，但没有在自动生成的MapsActivity类中调用的方法。它的代码是：

package com.example.work.myapplication3;

import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.UiSettings;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        AlertDialog.Builder ad = new AlertDialog.Builder(this);
        ad.setMessage("Message");
        ad.create().show();    
    }


    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;


        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }
}

我添加了消息框以查看调用onCreate方法的时间。但它从未调用，而地图显示在屏幕上。

我想创建几个活动，其自己的类包含其逻辑。但此时我可以创建子活动，但不能使用它的类。我希望在将此活动包含到另一个活动时自动创建活动的类。

我做错了什么？

由于

Android Studio。当<include>标记包含活动时未调用活动类

0 个答案: