Android 从主要活动中调用 2 个或更多类

Question

我是安卓新手。我有主要活动，我需要从中调用不同的类来执行不同的功能。但是每当我同时调用两个类时，只会调用最后一个意图。有人可以建议一种在活动中同时调用 2 个或更多类的方法。谢谢

下面是我的代码示例

主要活动

public class MainActivity extends AppCompatActivity {

    public Api mApi;
    Button  data;

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

        data = (Button) findViewById(R.id.button2);



        //calling sygic truck api and implementing sygic call back
        mApi = Api.init(getApplicationContext(), "com.sygic.truck", "com.sygic.truck.SygicService", mApiCallback);
        //connecting sygic app
        mApi.connect();



        data.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent1 = new Intent(getApplicationContext(), locationInfo.class);

                Intent intent2 = new Intent(getApplicationContext(), routeInfo.class);

                Intent[] list = new Intent[2];
                list[0] = intent1;
                list[1] = intent2;
                startActivities(list);

            }
        });

    }




}

---

locationInfo 类

public class locationInfo extends AppCompatActivity {

    public Api mApi;
    public TextView coordinates;
    public String currentLocation = "";
    public String longitude;
    public String latitude;
    public Button data;
    public String altitude, speed;

    public int speedLimit;

    //calling gps class from sygic lib
    GpsPosition gpsPos = new GpsPosition();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        coordinates = (TextView) findViewById(R.id.textView);




        // sygicGetData();
        try {
            Log.v("debug", "Location is...1" );
            boolean satInfo = true;
            int maxTime = 0;

            gpsPos = ApiNavigation.getActualGpsPosition(satInfo, maxTime);
            longitude = String.valueOf(gpsPos.getLongitude());
            latitude = String.valueOf(gpsPos.getLatitude());
            altitude = String.valueOf(gpsPos.getAltitude());
            speed = String.valueOf(gpsPos.getSpeed());
            speedLimit = ApiInfo.getCurrentSpeedLimit(maxTime);
            Log.v("debug", "Location is...2" );
            Position pos = new Position();
            pos.setPosition(gpsPos.getLongitude(), gpsPos.getLatitude());
            currentLocation = ApiLocation.getLocationAddressInfo(pos, maxTime);


            coordinates.setText("\n" + "Current Location:" + currentLocation + "\n" + "Longitude:" + longitude + "\n" + "Latitude:" + latitude +
                    "\n" + "Altitude:" + altitude + "\n" + "Current Speed:" + speed +
                    "\n" + "Speed Limit:" + speedLimit);

        } catch (GpsException e) {
            Log.e("GpsPosition", "Error code:" + e.getCode());
        } catch (InvalidLocationException e) {
            Log.e("Location", "Error code:" + e.getCode());
        } catch (GeneralException e) {
            e.printStackTrace();
        }
    }
}

---

routeInfo 类

public class routeInfo extends AppCompatActivity  {

    public String remainingDistance, remainingTime;
    public String totalDistance, totalTime;
    public Button data;
    public TextView coordinates;
    public RouteInfo routeInfo;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        coordinates = (TextView)findViewById(R.id.textView2);


        // sygicGetData();
        try {
            boolean info = true;
            int maxTime = 0;

            routeInfo = ApiNavigation.getRouteInfo(info, maxTime);
            totalDistance = String.valueOf(routeInfo.getTotalDistance());
            remainingDistance = String.valueOf(routeInfo.getRemainingDistance());
            totalTime = String.valueOf(routeInfo.getTotalTime());
            remainingTime = String.valueOf(routeInfo.getRemainingTime());

            coordinates.setText("\n" + "Total Travel Distance:" + totalDistance + "\n" + "Remaining Travel Distance:" + remainingDistance + "\n" + "Total Travel Time:" + totalTime + "\n" +
                    "Remaining Travel Time:" + remainingTime + "\n");

        } catch (GpsException e) {
            Log.e("GpsPosition", "Error code:" + e.getCode());
        } catch (InvalidLocationException e) {
            Log.e("Location", "Error code:" + e.getCode());
        } catch (GeneralException e) {
            e.printStackTrace();
        }
    }
}

---

Android 清单

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.jackfruit.sygicdata4">

    <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>
        <activity android:name=".getters.locationInfo"></activity>
        <activity android:name=".getters.routeInfo"></activity>
    </application>

</manifest>

Answer 1

好的，

startActivities()

用于构造称为合成后栈的东西。

在一个应用中，当你从一个活动移动到另一个而不调用一个活动时

finish()

在任何活动中，您都构建了称为“backstack”的东西。它被称为后退堆栈，因为它是在您按住后退按钮时恢复的活动堆栈。

如果你想人为地创建一个backstack，你会

-startActivities()

这样做是人为地将除最后一个意图的活动之外的所有内容插入到后台堆栈中。

如果你想运行 activit 1 然后运行 ​​activity2 打个电话

startActivity()

分别

如果您希望这 2 个任务并行运行，您需要使用称为“AsyncTask”的东西。文学here