Appel d'une méthode d'une autre classe

Bonjour,
J'essaie d'appeler une méthode d'un autre classe, mais j'ai un plantage à l’exécution.
Merci d'avance pour votre aide.
Bernard

Appelant :

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    public void updatetxt(View v) {
        TextSMS monObjet = new TextSMS();
        monObjet.TraitementText();
    }

Appelé :

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package com.androidexample.bloqueurcallsms;
 
import android.app.Activity;
import android.os.Environment;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
 
public class TextSMS extends Activity {
    EditText tv1;
 
    // @Override
    // protected void onCreate(Bundle savedInstanceState) {
    //     super.onCreate(savedInstanceState);
    // }
    public void TraitementText() {
        tv1 = (EditText) findViewById(R.id.editTextSMS);
        setContentView(R.layout.activity_texte);
        FileInputStream fis = null;
        String BufferBlock = "";
        File ContactsFolderDir = new File(Environment.getExternalStorageDirectory() + File.separator + "ABloquer");
        String myFileTexteBloque = ContactsFolderDir + File.separator + "BlockSmsTexte.txt";
        File filetxtbloque = new File(myFileTexteBloque);
        try {
            fis = new FileInputStream(filetxtbloque);
            int content;
            BufferBlock = "";
            while ((content = fis.read()) != -1) {
                // convert to char and display it
                System.out.print((char) content);
                BufferBlock = BufferBlock + (char) content;
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fis != null)
                    fis.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        tv1 = (EditText) findViewById(R.id.editTextSMS);
        tv1.setText(BufferBlock);
    }
 
    public void updatemessage(View v) {
        tv1 = (EditText) findViewById(R.id.editTextSMS);
        String Chaine = tv1.getText().toString();
        // Toast.makeText(this, "Click updatemessage : " + Chaine, Toast.LENGTH_LONG).show();
        WriteToFile(Chaine, "BlockSmsTexte.txt");
    }
 
    public void WriteToFile(String TheText, String dst) {
        File ContactsFolderDir = new File(Environment.getExternalStorageDirectory() + File.separator + "ABloquer");
        String myFileDst = ContactsFolderDir + File.separator + dst;
        FileOutputStream fos = null;
        File file;
        if (!ContactsFolderDir.exists()) {
            ContactsFolderDir.mkdirs();
        }
        byte[] bytesArray = TheText.getBytes();
        try {
            file = new File(myFileDst);
            fos = new FileOutputStream(file);
            fos.write(bytesArray);
            fos.flush();
        } catch (IOException ioe) {
            Toast.makeText(getApplicationContext(), "Erreur Write " + ioe, Toast.LENGTH_LONG).show();
        }
    }
}

Fichier AndoidManifest.xml :

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidexample.bloqueurcallsms"
    android:versionCode="1"
    android:versionName="1.0">
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission>
    <uses-permission android:name="android.permission.READ_SMS" />
    <uses-permission android:name="android.permission.WRITE_CONTACTS" />
    <uses-permission android:name="android.permission.WRITE_CALL_LOG" />
    <uses-permission android:name="android.permission.READ_CALL_LOG" />
 
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="MyBlocker"
        android:theme="@style/AppTheme">
        <activity
            android:name="com.androidexample.bloqueurcallsms.MyBlocker"
            android:label="MyBlocker">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.androidexample.bloqueurcallsms.TextSMS"
            android:label="TextSMS">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>