Question

Hey, Im trying something in android, that has to get the words sent in sms and print on the emulator screen. But the app doesnt update in time.

I send a message. Ok. But when I open the app it doesnt print the words that I’ve sent. So i have to close the emulator and then open it again, and run the app, and the word is there.

Id like that when I sent the message and then I access the app, the word is printed without I have to close the emulator.

How do I do this?

So here is my code. Remember that I want to, send a new SMS and when I go to my app again, (without close and open the emulator), it updates the words in the screen, the new words shall be printed in the screen. Thx.

I have this class SMS.java, which is my activity, and another class, that is below this one here, called DataHelper.java, which manipulate my database, and has the methods to insert, query, update, etc.:

SMS.java

package com.sys;

import java.util.List;
import java.util.StringTokenizer;

import com.sys.DataHelper;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.os.Bundle;
import android.provider.BaseColumns;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.sys.ratedSmsContacts;
public class SMS extends Activity { 

private DataHelper dh;  
private static TextView txtView;                
private static Button btnChkCntts;
private static Button btnChkTag;

final Uri CONTENT_URI = Uri.parse("content://sms/sent");
    @Override
    public void onCreate(Bundle savedInstanceState) {
    this.dh = new DataHelper(this); 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final Button button = (Button) findViewById(R.id.btnChkCntts);
    button.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Intent myIntent = new Intent(v.getContext(), ratedSmsContacts.class);
        startActivityForResult(myIntent, 0);
    }
    });

    txtView =    (TextView)findViewById(R.id.txtView);      
        Cursor cursor = getContentResolver().query(CONTENT_URI, null, null, null, null);                                    
        String body;  
        String atual;
        if(cursor.moveToFirst()){
            body = cursor.getString(cursor.getColumnIndexOrThrow("body")).toString();
            if(body == " "){
                Toast.makeText(getBaseContext(), "There is no words to save!", Toast.LENGTH_LONG).show();
            }
                else{                               
                    StringTokenizer st = new StringTokenizer(body);                   
                    while(st.hasMoreTokens()){
                        atual = st.nextToken();
                            while(this.dh.select(atual) == true){
                                this.dh.atualiza(atual);
                                Toast.makeText(getBaseContext(), "Word updated!", Toast.LENGTH_LONG).show();
                            }
                            while(this.dh.select(atual) == false){
                                this.dh.insert(atual);
                                Toast.makeText(getBaseContext(), "Word added!", Toast.LENGTH_LONG).show();
                            }
                        }
                    }
                    List<String> words = this.dh.selectAll();
                    StringBuilder sb = new StringBuilder();
                    sb.append("Set of words:\n\n");
                    for (String w : words) {
                        sb.append(w);
                        sb.append(" ");                         

                    }   
                    txtView.setText(sb.toString());
                }                   
        }             
   }

DataHelper.java

package com.sys;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteStatement;
import android.util.Log;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class DataHelper {

private static final String DATABASE_NAME = "sms.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "words";

private Context context;
private SQLiteDatabase db;

private SQLiteStatement insertStmt;
private SQLiteStatement updateStmt;
private static final String INSERT = "insert into " 
  + TABLE_NAME + "(word, cont) values (?, 1)";

public DataHelper(Context context) {
  this.context = context;
  OpenHelper openHelper = new OpenHelper(this.context);
  this.db = openHelper.getWritableDatabase();         
  //openHelper.onUpgrade(db, 1, 2);
  this.insertStmt = this.db.compileStatement(INSERT);
 }

public long insert(String word) { 
  this.insertStmt.bindString(1, word);             
  return this.insertStmt.executeInsert();
 }

public void atualiza(String word){
   this.db.execSQL("UPDATE words SET cont = cont + 1 WHERE (word= ?)", new String[] {word} );      
 }

public void deleteAll() {
  this.db.delete(TABLE_NAME, null, null);
 }

public boolean select(String wrd) {
  String word;
  Cursor cursor = this.db.query(TABLE_NAME, new String[] {"word"}, "word like ?", new String[] {wrd} , null, null, null);
  if (cursor.moveToFirst()) {
     do {
        word = cursor.getString(0); 
     } while (cursor.moveToNext());
   }
  if (cursor != null && !cursor.isClosed()) {
     cursor.close();         
     return true;         
  }else{
      return false;
  }
}

public List<String> selectMaxCont(){       
   List<String> list = new ArrayList<String>();
   Cursor cursor = this.db.query(TABLE_NAME, new String[]{"word"}, null, null, null, null, "cont desc");
   if(cursor.moveToFirst()){
       do{
   list.add(cursor.getString(0));
       }while(cursor.moveToNext());
   }
   if(cursor != null && !cursor.isClosed()){
       cursor.close();
   }
   return list;
}

public List<String> selectAll() {
      List<String> list = new ArrayList<String>();
      Cursor cursor = this.db.query(TABLE_NAME, new String[] { "word" }, null, null, null, null, "cont desc");
      if (cursor.moveToFirst()) {
         do {
            list.add(cursor.getString(0).toUpperCase()); 
         } while (cursor.moveToNext());
      }
      if (cursor != null && !cursor.isClosed()) {
         cursor.close();
      }
      return list;
   }

private static class OpenHelper extends SQLiteOpenHelper {

  OpenHelper(Context context) {
     super(context, DATABASE_NAME, null, DATABASE_VERSION);
  }

  @Override
  public void onCreate(SQLiteDatabase db) {
     db.execSQL("CREATE TABLE " + TABLE_NAME + "(id INTEGER PRIMARY KEY, word TEXT, cont INTEGER)");         
  }

  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
     Log.w("SMS Words Database", "Upgrading database, this will drop tables and recreate.");
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
     onCreate(db);
  }
 }
}

Answer 1

You could move all most of the code in the OnCreate() to onResume within your activity. Basically you should query the content resolver within the onResume so that you get a fresh set of the data when your activity is in the foreground. Without this you are getting a snapshot when the activity is created. It’s going to be paused when you go to the SMS screen and then resumed when you go back to it. It is still alive even though you switched apps so the onCreate won’t be called until the activity is either killed or finished and then rentered.

So in short move the ContentResolver.query() to the onResume. And display your state there.