我如何从GPS服务获取坐标到文本文件？ [英] How do I get coordinates from a GPS service into a text file?

问题描述

我是Android编程的新手。我粘贴的源代码不是我自己的，它来自Github项目。我想将GPS服务的坐标保存到文本文件中。有谁知道如何做到这一点？

  public class MainActivity extends AppCompatActivity {
 
 private Button btn_start， btn_stop; 
公共按钮保存; 
 
私有BroadcastReceiver broadcastReceiver; 
 int delay = 1000; //延迟1秒
 int period = 10000; //每10秒重复一次。 
定时器定时器=新的定时器（）; 
 public EditText editText; 
 public TextView textView; 
 
 public String path = Environment.getExternalStorageDirectory（）。getAbsolutePath（）+/ aaTutorial; 
 
 @Override 
 protected void onResume（）{
 super.onResume（）; 
 if（broadcastReceiver == null）{
 broadcastReceiver = new BroadcastReceiver（）{
 @Override 
 public void onReceive（Context context，Intent intent）{
 
 textView.append（\\\
+ intent.getExtras（）。get（coordinates））; 
 
} 
}; 
} 
 registerReceiver（broadcastReceiver，new IntentFilter（location_update））; 
 
 
 @Override 
 protected void onDestroy（）{
 super.onDestroy（）; 
 if（broadcastReceiver！= null）{
 unregisterReceiver（broadcastReceiver）; 
} 
} 
 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_main）; 
 
 btn_start =（Button）findViewById（R.id.button）; 
 btn_stop =（Button）findViewById（R.id.button2）; 
 textView =（TextView）findViewById（R.id.textView）; 
 save =（Button）findViewById（R.id.save）; 
文件dir = new File（path）; 
 dir.mkdirs（）; 
 
 if（！runtime_permissions（））
 enable_buttons（）; 
 
 
 $ b private void enable_buttons（）{
 
 btn_start.setOnClickListener（new View.OnClickListener（）{
 @Override 
 public void onClick（View view）{
 Intent i = new Intent（getApplicationContext（），GPS_Service.class）; 
 startService（i）; 
} 
}）; 
 
 btn_stop.setOnClickListener（new View.OnClickListener（）{
 @Override 
 public void onClick（View view）{
 
 Intent i = new Intent （getApplicationContext（），GPS_Service.class）; 
 stopService（i）; 
 
} 
}）; （Build.VERSION.SDK_INT> = 23&&& ContextCompat.checkSelfPermission（this，Manifest。）。
 
 
 $ b private boolean runtime_permissions（）{
 if （Package.PERMISSION_GRANTED）！= PackageManager.PERMISSION_GRANTED&&& ContextCompat.checkSelfPermission（this，Manifest.permission.ACCESS_COARSE_LOCATION）！= PackageManager.PERMISSION_GRANTED）{
 $ b requestPermissions（new String [] {Manifest.permission .ACCESS_FINE_LOCATION，Manifest.permission.ACCESS_COARSE_LOCATION}，100）; 
 
返回true; 
} 
返回false; 
 
 
 $ b @Override 
 public void onRequestPermissionsResult（int requestCode，@NonNull String [] permissions，@NonNull int [] grantResults）{
 super .onRequestPermissionsResult（requestCode，permissions，grantResults）; 
 if（requestCode == 100）{
 if（grantResults [0] == PackageManager.PERMISSION_GRANTED&&& amp; grantResults [1] == PackageManager.PERMISSION_GRANTED）{
 enable_buttons（）; 
} else {
 runtime_permissions（）; 
} 
} 
} 
} 
  

解决方案使用 BufferedWriter ，并调用 BufferedWriter.write（）方法您的 BroadcastReceiver.onReceive（）。

$ b

假设您的当前代码有效，您可以在这里检查所需的更改：

  BufferedWriter作家; 
 
 @Override 
 protected void onCreate（Bundle savedInstanceState）{
 super.onCreate（savedInstanceState）; 
 setContentView（R.layout.activity_main）; 
 
 writer = new BufferedWriter（new FileWriter（mnt / sdcard / gps.txt））; 
 // ... 
 
} 
 
 @Override 
 protected void onResume（）{
 super.onResume（）; 
 if（broadcastReceiver == null）{
 broadcastReceiver = new BroadcastReceiver（）{
 @Override 
 public void onReceive（Context context，Intent intent）{
 
 textView.append（\\\
+ intent.getExtras（）。get（coordinates））; 
 
 writer.write（intent.getExtras（）。get（coordinates））; 
 writer.newLine（）; 
 
} 
}; 
} 
 registerReceiver（broadcastReceiver，new IntentFilter（location_update））; 
} 
 
保护无效的onDestroy（）{
 super.onDestroy（）; 
 writer.close（）; 
 if（broadcastReceiver！= null）{
 unregisterReceiver（broadcastReceiver）; 
} 
} 
  

I am new to Android programming. The source code that I have pasted is not my own, it is from a Github project. I want to save the coordinates of a GPS service into a textfile. Does anyone know how to do this?

public class MainActivity extends AppCompatActivity {

private Button btn_start, btn_stop;
public Button save;

private BroadcastReceiver broadcastReceiver;
int delay = 1000; // delay for 1 sec.
int period = 10000; // repeat every 10 sec.
Timer timer = new Timer();
public EditText editText;
public TextView textView;

public String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/aaTutorial";

@Override
protected void onResume() {
    super.onResume();
    if(broadcastReceiver == null){
        broadcastReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {

                textView.append("\n" +intent.getExtras().get("coordinates"));

            }
        };
    }
    registerReceiver(broadcastReceiver,new IntentFilter("location_update"));
}

@Override
protected void onDestroy() {
    super.onDestroy();
    if(broadcastReceiver != null){
        unregisterReceiver(broadcastReceiver);
    }
}

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

    btn_start = (Button) findViewById(R.id.button);
    btn_stop = (Button) findViewById(R.id.button2);
    textView = (TextView) findViewById(R.id.textView);
    save = (Button) findViewById(R.id.save);
    File dir = new File(path);
    dir.mkdirs();

    if(!runtime_permissions())
        enable_buttons();

}

private void enable_buttons() {

    btn_start.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent i =new Intent(getApplicationContext(),GPS_Service.class);
            startService(i);
        }
    });

    btn_stop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            Intent i = new Intent(getApplicationContext(),GPS_Service.class);
            stopService(i);

        }
    });

}

private boolean runtime_permissions() {
    if(Build.VERSION.SDK_INT >= 23 && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED){

        requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},100);

        return true;
    }
    return false;
}


@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if(requestCode == 100){
        if( grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED){
            enable_buttons();
        }else {
            runtime_permissions();
        }
    }
}
}

解决方案

Make use of a BufferedWriter, and call BufferedWriter.write() method inside your BroadcastReceiver.onReceive().

Assuming your current code works, here you can check the changes needed:

BufferedWriter writer;

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

    writer = new BufferedWriter(new FileWriter("mnt/sdcard/gps.txt"));
    //...

}

@Override
protected void onResume() {
    super.onResume();
    if(broadcastReceiver == null){
        broadcastReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {

                textView.append("\n" +intent.getExtras().get("coordinates"));

                writer.write(intent.getExtras().get("coordinates"));
                writer.newLine();

            }
        };
    }
    registerReceiver(broadcastReceiver,new IntentFilter("location_update"));
}

protected void onDestroy() {
    super.onDestroy();
    writer.close();
    if(broadcastReceiver != null){
        unregisterReceiver(broadcastReceiver);
    }
}

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