[android] textView.setText("click Bottone Uno"); dove sbaglio?

[slackyct]

questo e' l'errore che genera in esecuzione:

    --------- beginning of crash
01-14 21:41:38.978    1137-1137/itbuttontest.ribosoft.buttontest E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: itbuttontest.ribosoft.buttontest, PID: 1137
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
            at itbuttontest.ribosoft.buttontest.MainActivity$1.onClick(MainActivity.java:25)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

questa e' la parte di codice:

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Button;
import android.view.View;
import org.w3c.dom.Text;


public class MainActivity extends ActionBarActivity {
    private TextView textView;
    private Button bottone1;
    private Button bottone2;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bottone1 = (Button) findViewById(R.id.button1);
            bottone1.setOnClickListener(new View.OnClickListener(){
        public void onClick(View view) {
                textView.setText("click Bottone Uno");
        }
    } );


        bottone2 = (Button) findViewById(R.id.button2);


    }

[slackyct]

ops mancava
textView1 = (TextView) findViewById(R.id.textView1);

[giovannifa]

public class MainActivity extends ActionBarActivity {
private TextView textView;
private Button bottone1;
private Button bottone2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bottone1 = (Button) findViewById(R.id.button1);
textView = (TextView) findViewById(R.id.textView1);
bottone1.setOnClickListener(new View.OnClickListener(){
public void onClick(View view) {
textView.setText("click Bottone Uno");
}
}
);
bottone2 = (Button) findViewById(R.id.button2);



}




<TextView
android:id="@+id/textView1"
android:text="prova"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="22dp"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/button1"
android:layout_below="@+id/textView1"
android:layout_toRightOf="@+id/textView1"
android:layout_toEndOf="@+id/textView1"
android:layout_marginTop="81dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/button2"
android:layout_below="@+id/button1"
android:layout_alignLeft="@+id/button1"
android:layout_alignStart="@+id/button1"
android:layout_marginTop="132dp" />