title: Hello, I tried convert string value from my database to int, but it didn't happen
body: <h1>This fragment of code have to count "imt" value, using two (String)values from my database. But my program crashes, I gave your my Logcat below! I think, i wrong in Integer conversion.</h1>
  
  <pre><code>public class ScheduleActivity extends AppCompatActivity {
      DataBaseHelper myDb;
      Button mon_tue,wed_th,fri_sat;
      TextView result_title,result_warm_up,result_one,result_two,result_three,result_four,result_five,result_six,result_seven;
      long imt;
      String name;
      String age;
      String weight;
      String height;
      String gender;
      String trauma;
      String illnesses;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_schedule);
          /*DataBase*/
          myDb = new DataBaseHelper(this);
          /*Buttons*/
          mon_tue = (Button) findViewById(R.id.mon_tue);
          wed_th = (Button) findViewById(R.id.wed_th);
          fri_sat = (Button) findViewById(R.id.fri_sat);
          /*TEXTVIEWS*/
          result_title = (TextView) findViewById(R.id.result_title);
          result_warm_up = (TextView) findViewById(R.id.result_warm_up);
          result_one = (TextView) findViewById(R.id.result_one);
          result_two = (TextView) findViewById(R.id.result_two);
          result_three = (TextView) findViewById(R.id.result_three);
          result_four = (TextView) findViewById(R.id.result_four);
          result_five = (TextView) findViewById(R.id.result_five);
          result_six = (TextView) findViewById(R.id.result_six);
          result_seven = (TextView) findViewById(R.id.result_seven);
          /*read data*/
          Cursor res = myDb.getAllData();
          if(res!=null&amp;&amp;res.getCount()&gt;0){
              while (res.moveToNext()){
                  name = res.getString(res.getColumnIndex("NAME"));
                  age = res.getString(res.getColumnIndex("AGE"));
                  weight = res.getString(res.getColumnIndex("WEIGHT"));
                  height = res.getString(res.getColumnIndex("HEIGHT"));
                  gender = res.getString(res.getColumnIndex("GENDER"));
                  trauma = res.getString(res.getColumnIndex("TRAUMA"));
                  illnesses = res.getString(res.getColumnIndex("ILLNESSES"));
                  /*IMT(imt) - Brain of my App*/
                  int height_int = Integer.parseInt(height.trim());
                  int weight_int = Integer.parseInt(weight.trim());
                  imt = ((weight_int/(height_int*height_int))*10000);
                  /*It is the end of brain opportunities*/
                  if(imt&lt;18.5){
  
                      result_title.setText(R.string.hi+", "+R.string.name);
                      result_warm_up.setText(R.string.warm_up);
                      result_one.setText(R.string.abdominal_muscles+" "+name);
                      result_two.setText(R.string.the_dumbbell_fly+" "+"");
                      result_three.setText(R.string.extension_of_the_trunk+" "+"");
                      result_four.setText(R.string.hand_dumbbell_side_lift+" "+"");
                      result_five.setText(R.string.pull_up+" "+"");
                      result_six.setText(R.string.pullover+" "+"");
                  }
                  if(imt==0){
                      result_title.setText(R.string.data);
                  }
              }
          }else{
              result_title.setText(R.string.result_wrong);
          }
  
      }
  
  } 
  </code></pre>
  
  <h1>My logcat!</h1>
  
  <pre><code>/myway E/AndroidRuntime: FATAL EXCEPTION: main
      Process: adais.myway, PID: 30254
      java.lang.RuntimeException: Unable to start activity ComponentInfo{adais.myway/myway.ScheduleActivity}: java.lang.NumberFormatException: Invalid int: ""
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2338)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
          at android.app.ActivityThread.access$800(ActivityThread.java:151)
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
          at android.os.Handler.dispatchMessage(Handler.java:110)
          at android.os.Looper.loop(Looper.java:193)
          at android.app.ActivityThread.main(ActivityThread.java:5299)
          at java.lang.reflect.Method.invokeNative(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:515)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)
          at dalvik.system.NativeStart.main(Native Method)
       Caused by: java.lang.NumberFormatException: Invalid int: ""
          at java.lang.Integer.invalidInt(Integer.java:137)
          at java.lang.Integer.parseInt(Integer.java:358)
          at java.lang.Integer.parseInt(Integer.java:331)
          at adais.myway.ScheduleActivity.onCreate(ScheduleActivity.java:58)
          at android.app.Activity.performCreate(Activity.java:5264)
          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 
          at android.app.ActivityThread.access$800(ActivityThread.java:151) 
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321) 
          at android.os.Handler.dispatchMessage(Handler.java:110) 
          at android.os.Looper.loop(Looper.java:193) 
          at android.app.ActivityThread.main(ActivityThread.java:5299) 
          at java.lang.reflect.Method.invokeNative(Native Method) 
          at java.lang.reflect.Method.invoke(Method.java:515) 
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825) 
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641) 
          at dalvik.system.NativeStart.main(Native Method) 
  </code></pre>
  
  <h1>I think my database is not correct?</h1>
  
  <pre><code>public class DataBaseHelper extends SQLiteOpenHelper{
      public static final String DATABASE_NAME = "Schedule.dp";
      public static final String TABLE_NAME = "Schedule_table";
      /*Col*/
      public static final String COL_1 = "ID";
      public static final String COL_2 = "NAME";
      public static final String COL_3 = "AGE";
      public static final String COL_4 = "WEIGHT";
      public static final String COL_5 = "HEIGHT";
      public static final String COL_6 = "GENDER";
      public static final String COL_7 = "TRAUMA";
      public static final String COL_8 = "ILLNESSES";
  
      public DataBaseHelper(Context context) {
          super(context,DATABASE_NAME,null,1);
      }
  
      @Override
      public void onCreate(SQLiteDatabase db){
          db.execSQL("CREATE TABLE "+TABLE_NAME+" (ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,AGE INTEGER,WEIGHT INTEGER,HEIGHT INTEGER,GENDER TEXT,TRAUMA TEXT,ILLNESSES TEXT)");
      }
      @Override
      public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
          db.execSQL("DROP TABLE IF EXISTS "+ TABLE_NAME);
      }
  
      public boolean updataData(String id,String name,String age,String weight,String height,String gender,String trauma,String illnesses){
          SQLiteDatabase db = this.getWritableDatabase();
          ContentValues contentValues = new ContentValues();
          contentValues.put(COL_2,name);
          contentValues.put(COL_3,age);
          contentValues.put(COL_4,weight);
          contentValues.put(COL_5,height);
          contentValues.put(COL_6,gender);
          contentValues.put(COL_7,trauma);
          contentValues.put(COL_8,illnesses);
          int result = db.update(TABLE_NAME,contentValues,"ID =?",new String[]{id});
          if (result&gt;0){
              return true;
          }else{
              return false;
          }
  
      }
      public boolean insertData(String name,String age,String weight,String height,String gender,String trauma,String illnesses){
          SQLiteDatabase db = this.getWritableDatabase();
          ContentValues contentValues = new ContentValues();
          contentValues.put(COL_2,name);
          contentValues.put(COL_3,age);
          contentValues.put(COL_4,weight);
          contentValues.put(COL_5,height);
          contentValues.put(COL_6,gender);
          contentValues.put(COL_7,trauma);
          contentValues.put(COL_8,illnesses);
          long result = db.insert(TABLE_NAME,null,contentValues);
          db.close();
          if (result==-1){
              return false;
          }else{
              return true;
          }
  
      }
      public Cursor getAllData(){
          SQLiteDatabase db = this.getWritableDatabase();
          Cursor res = db.rawQuery("Select * from "+ TABLE_NAME,null);
          return res;
      }
  }
  </code></pre>
  
  <h1>And my main activity</h1>
  
  <p>public class MainActivity extends AppCompatActivity {</p>
  
  <pre><code>    DataBaseHelper myDb;
      EditText name_edittext,age_edittext,weight_edittext,height_edittext;
      Spinner gender_spinner,trauma_spinner,illnesses_spinner;
      Button save,test_b;
      String name;
      TextView test;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          /*DataBase*/
          myDb = new DataBaseHelper(this);
  
          test = (TextView) findViewById(R.id.test_text);
          test_b = (Button) findViewById(R.id.test);
          test_b.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  test();
              }
          });
  
          /*Spinners*/
          gender_spinner = (Spinner) findViewById(R.id.spinner_gender);
          trauma_spinner = (Spinner) findViewById(R.id.spinner_trauma);
          illnesses_spinner = (Spinner) findViewById(R.id.spinner_illnesses);
  
          String [] gender={"Male","Female"};
          ArrayAdapter&lt;String&gt; gender_adapter = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_dropdown_item,gender);
          gender_spinner.setAdapter(gender_adapter);
          String [] trauma={"Back","Hand","Leg"};
          ArrayAdapter&lt;String&gt; trauma_adapter = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_dropdown_item,trauma);
          trauma_spinner.setAdapter(trauma_adapter);
          String [] illnesses={"Yes","None"};
          ArrayAdapter&lt;String&gt; illnesses_adapter = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_dropdown_item,illnesses);
          illnesses_spinner.setAdapter(illnesses_adapter);
          /*EditTexts*/
          name_edittext = (EditText) findViewById(R.id.name);
          age_edittext = (EditText) findViewById(R.id.age);
          weight_edittext = (EditText) findViewById(R.id.weight);
          height_edittext = (EditText) findViewById(R.id.height);
          /*Button*/
          save = (Button) findViewById(R.id.save_button);
          /*Save*/
          save.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  ClickMe();
              }
          });
      }
  
      private void ClickMe(){
          String name = name_edittext.getText().toString();
          String age = age_edittext.getText().toString();
          String weight = weight_edittext.getText().toString();
          String height = height_edittext.getText().toString();
          String gender = gender_spinner.getSelectedItem().toString();
          String trauma = trauma_spinner.getSelectedItem().toString();
          String illnesses = illnesses_spinner.getSelectedItem().toString();
          Boolean result = myDb.insertData(name,age,weight,height,gender,trauma,illnesses);
          if (result == true){
              Toast.makeText(this,"Data is added successfully",Toast.LENGTH_SHORT).show();
          }else {
              Toast.makeText(this,"Data is not added",Toast.LENGTH_SHORT).show();
          }
  
          Intent i = new Intent(this,MenuActivity.class);
          startActivity(i);
  
      }
      public void test(){
          Cursor res = myDb.getAllData();
          if(res!=null&amp;&amp;res.getCount()&gt;0){
              while (res.moveToNext()){
                  name = res.getString(res.getColumnIndex("NAME"));
  
              }
              Toast.makeText(this,"Data is read",Toast.LENGTH_SHORT).show();
          }else{
              Toast.makeText(this,"Data is unread",Toast.LENGTH_SHORT).show();
          }
          test.setText(name);
  
  
      }
  }
  </code></pre>
  
  <h1>At the end my layout of Schedule #</h1>
  
  <pre><code>&lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".ScheduleActivity"&gt;
  &lt;LinearLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"&gt;
      &lt;LinearLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:orientation="horizontal"&gt;
          &lt;Button
              android:id="@+id/mon_tue"
              android:layout_width="0dp"
              android:layout_height="wrap_content"
              android:layout_weight="1"
              android:background="#0091EA"
              android:text="@string/mon_tue"/&gt;
          &lt;Button
              android:id="@+id/wed_th"
              android:layout_width="0dp"
              android:layout_height="wrap_content"
              android:layout_weight="1"
              android:background="#0091EA"
              android:text="@string/wed_th"/&gt;
          &lt;Button
              android:id="@+id/fri_sat"
              android:layout_width="0dp"
              android:layout_height="wrap_content"
              android:layout_weight="1"
              android:background="#0091EA"
              android:text="@string/fri_sat"/&gt;
      &lt;/LinearLayout&gt;
      &lt;TextView
          android:layout_margin="20dp"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:id="@+id/result_title"
          android:textSize="26dp"
          android:textStyle="italic"
          android:text="@string/result_wrong"/&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:id="@+id/result_warm_up"
          android:textSize="26dp"/&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:id="@+id/result_one"
          android:textSize="26dp"/&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:id="@+id/result_two"
          android:textSize="26dp"/&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:id="@+id/result_three"
          android:textSize="26dp"/&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:id="@+id/result_four"
          android:textSize="26dp"/&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:id="@+id/result_five"
          android:textSize="26dp"/&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:id="@+id/result_six"
          android:textSize="26dp"/&gt;
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:id="@+id/result_seven"
          android:textSize="26dp"/&gt;
  
  &lt;/LinearLayout&gt;
  &lt;/ScrollView&gt;
  </code></pre>