Kiedy próbuję uruchomić poniższy kod, mój program się zatrzymuje. Chcę, aby ten kod uzyskał wartośćedittext ale to nie działa tak, jak się spodziewałem. Co ja robię źle?

public class MainActivity extends Activity {

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

    Button sum = (Button) findViewById(R.id.button1);
    Button cancel = (Button) findViewById(R.id.button2);

    final EditText from = (EditText) findViewById(R.id.editText1);
    final EditText upto = (EditText) findViewById(R.id.editText2);
    final EditText runsum = (EditText) findViewById(R.id.editText3);

    final int f = Integer.parseInt(from.getText().toString());
    final int u = Integer.parseInt(upto.getText().toString());

}

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

Oto mój LogCat przepraszam za bałagan: /

08-28 19:34:44.241: E/Trace(3346): error opening trace file: No such file or directory (2)
08-28 19:34:44.780: D/AndroidRuntime(3346): Shutting down VM
08-28 19:34:44.780: W/dalvikvm(3346): threadid=1: thread exiting with uncaught exception(group=0x40a13300)
08-28 19:34:44.790: E/AndroidRuntime(3346): FATAL EXCEPTION: main
08-28 19:34:44.790: E/AndroidRuntime(3346): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.project/com.example.project.MainActivity}: java.lang.NumberFormatException: Invalid int: ""
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.os.Looper.loop(Looper.java:137)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.app.ActivityThread.main(ActivityThread.java:4745)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at java.lang.reflect.Method.invokeNative(Native Method)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at java.lang.reflect.Method.invoke(Method.java:511)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at dalvik.system.NativeStart.main(Native Method)
08-28 19:34:44.790: E/AndroidRuntime(3346): Caused by: java.lang.NumberFormatException: Invalid int: ""
08-28 19:34:44.790: E/AndroidRuntime(3346):     at java.lang.Integer.invalidInt(Integer.java:138)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at java.lang.Integer.parseInt(Integer.java:359)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at java.lang.Integer.parseInt(Integer.java:332)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at com.example.project.MainActivity.onCreate(MainActivity.java:25)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.app.Activity.performCreate(Activity.java:5008)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
08-28 19:34:44.790: E/AndroidRuntime(3346):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
08-28 19:34:44.790: E/AndroidRuntime(3346):     ... 11 more
08-28 19:35:10.560: E/Trace(3394): error opening trace file: No such file or directory (2)
08-28 19:35:11.629: D/gralloc_goldfish(3394): Emulator without GPU emulation detected.
08-28 19:48:19.295: I/Choreographer(3394): Skipped 41 frames!  The application may be doing too much work on its main thread.