Ecriture\Modification fichier xml android

Bonjour ,

Je rencontre actuellement un soucis , je vous présente mon projet , je doit réaliser un formulaire qui permet d'enregistrer les données dans un fichier sous forme XML . Aprés plusieurs recherche sur internet , je parvient bien à créer mon fichier XML et à insérer des données dedans . Mon seul problème est que je ne parvient pas à ajouter d'autre données à la suite du fichier XML sans détruire les données précédentes , quelqu'un pourrais me donner un coup de main ou bien m'aiguillé ? Je vous met mon code ci dessous .

En vous remerciant , Surinox

Code:

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package com.example.enguerran.popopi;
 
import android.Manifest;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.util.Log;
import android.util.Xml;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
 
 
import org.xmlpull.v1.XmlSerializer;
 
public class MainActivity extends AppCompatActivity {
 
    private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters
    private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in Milliseconds
 
    protected LocationManager locationManager;
    protected ImageButton retrieveLocationButton;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getSupportActionBar().hide();
 
        ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
        retrieveLocationButton = (ImageButton) findViewById(R.id.Imagebutton);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
 
        locationManager.requestLocationUpdates(
                LocationManager.NETWORK_PROVIDER,
                MINIMUM_TIME_BETWEEN_UPDATES,
                MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
                new MyLocationListener()
        );
        showCurrentLocation();
        retrieveLocationButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showCurrentLocation();
            }
        });
 
        final Button button = (Button) findViewById(R.id.button2);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
 
                File newxmlfile = new File(Environment.getExternalStorageDirectory()+"/fichier.xml");
                try{
                    newxmlfile.createNewFile();
                }catch(IOException e)
                {
                    Log.e("IOException", "Exception in create new File(");
                }
 
 
                FileOutputStream fileos = null;
                try{
                    fileos = new FileOutputStream(newxmlfile);
 
                }catch(FileNotFoundException e)
                {
                    Log.e("FileNotFoundException",e.toString());
                }
 
 
 
 
 
                XmlSerializer serializer = Xml.newSerializer();
                try{
                    serializer.setOutput(fileos, "UTF-8");
                    serializer.startDocument(null, Boolean.valueOf(true));
                    serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
                    serializer.startTag(null, "Arbre");
 
                        serializer.startTag(null, "Arbre2");
                            serializer.attribute(null, "nummartelage", "12351");
                            serializer.attribute(null, "latitude", "50.655");
                            serializer.attribute(null, "longitude", "50.655");
                            serializer.attribute(null, "EssenceArbre", "Test");
                            serializer.attribute(null, "Diametre", "155cm");
                            serializer.attribute(null, "Hauteur", "24m");
                            serializer.attribute(null, "Volume", "24m²");
                            serializer.attribute(null, "Qualité", "Bonne");
                        serializer.endTag(null, "Arbre2");
 
                    serializer.endTag(null,"Arbre");
 
 
                    serializer.endDocument();
                    serializer.flush();
                    fileos.close();
 
 
                }catch(Exception e)
                {
                    Log.e("Exception","Exception occured in wroting");
                }
 
 
 
            }
        });
 
    }
 
    protected void showCurrentLocation() {
 
        Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
 
        if (location != null) {
            String message = String.format(
                    " Long: %1$s \n Lat: %2$s",
                    location.getLongitude(), location.getLatitude()
            );
 
            final EditText editText = (EditText) findViewById(R.id.editText2);
            Toast.makeText(MainActivity.this, message,
                    Toast.LENGTH_LONG).show();
            editText.setText(message);
        }
 
    }
 
    private class MyLocationListener implements LocationListener {
 
        public void onLocationChanged(Location location) {
            String message = String.format(
                    "Lon: %1$s  Lat: %2$s",
                    location.getLongitude(), location.getLatitude()
            );
            Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
        }
 
        public void onStatusChanged(String s, int i, Bundle b) {
            Toast.makeText(MainActivity.this, "Provider status changed",
                    Toast.LENGTH_LONG).show();
        }
 
        public void onProviderDisabled(String s) {
            Toast.makeText(MainActivity.this,
                    "Provider disabled by the user. GPS turned off",
                    Toast.LENGTH_LONG).show();
        }
 
        public void onProviderEnabled(String s) {
            Toast.makeText(MainActivity.this,
                    "Provider enabled by the user. GPS turned on",
                    Toast.LENGTH_LONG).show();
        }
 
    }
 
}

Code:

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<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fillViewport="true"> <!--IMPORTANT otherwise backgrnd img. will not fill the whole screen -->
 
 
 
<RelativeLayout
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin" >
 
 
 
 
    <ImageView
        android:layout_width="280dp"
        android:layout_height="120dp"
        android:background="@drawable/logo"
        android:layout_centerHorizontal="true"
        android:id="@+id/imageView" />
 
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Enregistrement d'un arbre"
        android:id="@+id/textView"
        android:layout_alignParentStart="true"
        android:textAlignment="center"
        android:layout_marginTop="150dp"
        android:layout_alignParentEnd="true"
        android:textColor="#000000"
        android:layout_marginBottom="0dp" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
 
        android:text="Numéro de martelage :"
        android:id="@+id/textView2"
        android:textAlignment="center"
        android:textColor="#000000"
 
        android:layout_toStartOf="@+id/editText"
        android:layout_alignParentEnd="false"
        android:layout_alignParentStart="true"
        android:layout_marginTop="220dp" />
 
    <EditText
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:id="@+id/editText"
        android:layout_alignBaseline="@+id/textView2"
        android:layout_alignBottom="@+id/textView2"
        android:layout_alignEnd="@+id/imageView" />
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Coordonnées GPS : "
        android:id="@+id/textView3"
        android:textAlignment="center"
        android:layout_centerVertical="true"
        android:layout_toStartOf="@+id/editText"
        android:layout_below="@id/textView2"
        android:layout_marginTop="25dp"
        android:textColor="#000000"
        android:layout_alignParentStart="true" />
 
    <EditText
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:id="@+id/editText2"
        android:textSize="10dp"
        android:layout_marginTop="12dp"
        android:layout_below="@+id/textView2"
        android:layout_toEndOf="@+id/textView3" />
 
 
 
    <ImageButton
        android:id="@+id/Imagebutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toEndOf="@+id/editText2"
        android:layout_below="@+id/textView2"
        android:src="@drawable/navigation"
        android:background="@color/white"
        android:layout_marginTop="25dp"
      />
 
 
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Essence de l&apos;arbre :"
        android:id="@+id/textView4"
        android:textAlignment="center"
        android:layout_centerVertical="true"
        android:layout_toStartOf="@+id/editText"
        android:layout_below="@id/textView2"
        android:layout_marginTop="69dp"
        android:textColor="#000000"
        android:layout_alignParentStart="true" />
 
    <EditText
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:id="@+id/editText3"
        android:layout_marginTop="12dp"
        android:layout_below="@+id/textView3"
        android:layout_toEndOf="@+id/textView4" />
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Diamètre(m) :"
        android:id="@+id/textView5"
        android:textAlignment="center"
        android:layout_centerVertical="true"
        android:layout_toStartOf="@+id/editText"
        android:layout_below="@id/textView3"
        android:layout_marginTop="69dp"
        android:textColor="#000000"
        android:layout_alignParentStart="true" />
 
    <EditText
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:id="@+id/editText5"
        android:layout_marginTop="12dp"
        android:layout_below="@+id/textView4"
        android:layout_toEndOf="@+id/textView5" />
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hauteur(m) :"
        android:id="@+id/textView6"
        android:textAlignment="center"
        android:layout_centerVertical="true"
        android:layout_toStartOf="@+id/editText"
        android:layout_below="@id/textView4"
        android:layout_marginTop="69dp"
        android:textColor="#000000"
        android:layout_alignParentStart="true" />
 
    <EditText
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:id="@+id/editText6"
        android:layout_marginTop="12dp"
        android:layout_below="@+id/textView5"
        android:layout_toEndOf="@+id/textView6" />
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Volume(m3) :"
        android:id="@+id/textView7"
        android:textAlignment="center"
        android:layout_centerVertical="true"
        android:layout_toStartOf="@+id/editText"
        android:layout_below="@id/textView5"
        android:layout_marginTop="69dp"
        android:textColor="#000000"
        android:layout_alignParentStart="true" />
 
    <EditText
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:id="@+id/editText7"
        android:layout_marginTop="12dp"
        android:layout_below="@+id/textView6"
        android:layout_toEndOf="@+id/textView7" />
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Qualité :"
        android:id="@+id/textView8"
        android:textAlignment="center"
        android:layout_centerVertical="true"
        android:layout_toStartOf="@+id/editText"
        android:layout_below="@id/textView6"
        android:layout_marginTop="69dp"
        android:textColor="#000000"
        android:layout_alignParentStart="true" />
 
    <EditText
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:id="@+id/editText8"
        android:layout_marginTop="12dp"
        android:layout_below="@+id/textView7"
        android:layout_toEndOf="@+id/textView8" />
 
 
 
 
    <DatePicker
        android:id="@+id/dpResult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"/>
 
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/button2"
        android:layout_row="1"
        android:layout_column="0"
        android:text="Enregistrer un arbre"
        android:layout_below="@+id/editText8"
        android:layout_marginTop="0dp"
        style="@style/button_text"
        android:background="@drawable/green_button"/>
 
 
</RelativeLayout>
 
 
</ScrollView>

Code:

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<?xml version="1.0" encoding="utf-8"?>
 
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 
    package="com.example.enguerran.popopi">
 
    <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>
    </application>
 
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 
 
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.google.android.gms.location.sample.basiclocationsample" />
</manifest>