android - 在android中的 Activity 之间传递字符串

Question

我已经搜索了很多地方，但我还没有找到任何有效的解决方案，我真的需要帮助! 我正在制作一个需要将经度和纬度字符串从一个 Activity 传递到另一个 Activity 的应用程序。 我怎样才能做到这一点？？？在此处查看我的代码:LocationActivity.java 需要将字符串传递给其他 Activity 以及我未粘贴到此处的另一个 Activity 。而需要传递的字符串命名为:"latLongString"

位置 Activity .java:

import android.R.string;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class LocationActivity extends Activity {
private String Location;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    LocationManager locManager;
    locManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
    locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1000L,500.0f, locationListener);
    Location location = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    updateWithNewLocation(location);
    if(location != null)                                
    {
        double latitude = location.getLatitude();
    double longitude = location.getLongitude();
    }  
  }


private void updateWithNewLocation(Location location) {
    TextView myLocationText = (TextView)findViewById(R.id.LocationWord);
    String latLongString = "";
    if (location != null) {
        double lat = location.getLatitude();
        double lng = location.getLongitude();
        latLongString = "Lat:" + lat + "\nLong:" + lng;
        //This is where i need to pass the string to the other activity

    } else {
        latLongString = "No location found";
    }
     myLocationText.setText("Your Current Position is:\n" +
            latLongString);
}

private final LocationListener locationListener = new LocationListener() {
    public void onLocationChanged(Location location) {
        updateWithNewLocation(location);
    }

    public void onProviderDisabled(String provider) {
        updateWithNewLocation(null);
    }

    public void onProviderEnabled(String provider) {
    }

    public void onStatusChanged(String provider, int status, Bundle extras) {
    }
};


}

其他 Activity :

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.List;
import java.util.Locale;

import android.R.string;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.os.Bundle;
import android.os.Environment;
import android.telephony.gsm.SmsMessage;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.location.LocationManager;
import android.location.LocationListener;

public class FindAndroidActivity extends Activity implements OnClickListener {
/** Called when the activity is first created. */
Button Nextbutton1, Nextbutton2, Nextbutton3, TestLocationService, EditSettings;
TextView Cordinates, Adress, FindAndroid, TextView;
EditText LocationWord;
private LocationManager locManager;
private LocationListener locListener;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
       setContentView(R.layout.firsttimescreen);
       Nextbutton1 = (Button)findViewById(R.id.Nextbutton1);
       Nextbutton1.setOnClickListener(this);
}
public void onClick(View src) {
    switch(src.getId()) {
    case R.id.Nextbutton1:
        setContentView(R.layout.setup);
        Nextbutton2 = (Button)findViewById(R.id.Nextbutton2);
        TestLocationService = (Button)findViewById(R.id.TestLocationService);
        TestLocationService.setOnClickListener(this);
        Nextbutton2.setOnClickListener(this);
        break;
    case R.id.Nextbutton2:
        setContentView(R.layout.setup1);
        Nextbutton3 = (Button)findViewById(R.id.Nextbutton3);
        LocationWord = (EditText)findViewById(R.id.LocationWord);
        LocationWord.requestFocus(View.FOCUS_DOWN);
        Nextbutton3.setOnClickListener(this);
        break;
    case R.id.Nextbutton3:
        setContentView(R.layout.main);
        EditSettings = (Button)findViewById(R.id.EditSettings);
        EditSettings.setOnClickListener(this);
        break;
    case R.id.TestLocationService:
        Bundle extras = getIntent().getExtras();
        if(extras !=null) {
            String value = extras.getString("KEY");             
        }
        Cordinates = (TextView)findViewById(R.id.Cordinates);
        Cordinates.setText(value);
            //This does not work because the string "value" isn't availible outside the braces,
            //obviously. How do i make it availible there???
        break;
    case R.id.EditSettings:
        setContentView(R.layout.setup1);
        Nextbutton3 = (Button)findViewById(R.id.Nextbutton3);
        LocationWord = (EditText)findViewById(R.id.LocationWord);
        LocationWord.requestFocus(View.FOCUS_DOWN);
        Nextbutton3.setOnClickListener(this);
        break;
    }
}

Answer 1

在您的 LocationActivity 类中:

Intent i = new Intent(this, FindAndroidActivity.class);
i.putExtra("KEY",YourData);

在 FindAndroidActivity 类中

Bundle extras = getIntent().getExtras();
if(extras !=null) {
    String value = extras.getString("KEY");
}