TableRow wird nicht automatisch erstellt

public class LiveAufnahme extends Activity {
		Button start, stop, charts;


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


			start = (Button) findViewById(R.id.startButton);
			start.setOnClickListener(startButton);


			stop = (Button) findViewById(R.id.stopButton);
			stop.setOnClickListener(stopButton);


			charts = (Button) findViewById(R.id.chartsButton);
			charts.setOnClickListener(chartsButton);
			
		} catch (Exception ex) {
			String s = ex.getMessage();
			String str = s;
		}
	}


 	//Ein paar OnClickListener Methoden
 	//...
 
	OnClickListener chartsButton = new OnClickListener() {


		@Override
		public void onClick(View v) {
			Intent intent = new Intent();
			intent.setClass(LiveAufnahme.this, SensorWork.class);
			startActivityForResult(intent, 0);
 		}
     };


 	//Methode holt mir eine Liste aus meiner 2. Klasse (2. Activity, die über eine OnClickMethode gestartet wird)
     	 @Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	    super.onActivityResult(requestCode, resultCode, data);


	    if (requestCode == 0) {
	   	 if (resultCode == RESULT_OK) {
	   		 double[] x_datas = data.getDoubleArrayExtra("x_array");
	   		 
	   		 double a = x_datas[(int)(x_datas.length/2)];
	   	   
	   	 }


	    }


	}   
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@+id/mainLayout"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">


	<Button android:id="@+id/startButton" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="Start" />
	<Button android:id="@+id/stopButton" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="Stop" />
	<Button android:id="@+id/chartsButton" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:text="Charts" />


</LinearLayout>

public class SensorWork extends Activity implements SensorListener,
		OnTouchListener {
//Variablen...


			super.onCreate(savedInstanceState);
			setContentView(R.layout.charts);


			sensorManager = SensorManagerSimulator.getSystemService(this,
					SENSOR_SERVICE);
			sensorManager.connectSimulator();


			// result = (TextView) findViewById(R.id.valuesText);
			// result.setText("No result yet...");


			// Horizontale Bewegung zuweisen
			this.vf = (ViewFlipper) findViewById(R.id.flipper);


			// Flipper mit Layouts füllen - siehe main.xml
			if (this.vf != null) {
				viewCharts = vf.getChildAt(0);
				viewDatas = vf.getChildAt(1);
				vf.setDisplayedChild(0);
			}


			LinearLayout layMain = (LinearLayout) findViewById(R.id.flipperlayout);
			layMain.setOnTouchListener((OnTouchListener) this);
    	
        	//...


       	dataTable = (TableLayout) findViewById(R.id.myTableLayout);


    	}


    	//Bei jedem neuen Wert, eine neue ROW anlegen
    	public void onSensorChanged(int sensor, float[] values) {
         	createRow(values[0], values[1], values[2], Color.rgb(65, 105, 255));
    	}


    	public void createRow(float x, float y, float z, int rowColor) {
		try {
			TableRow tr = new TableRow(this);


			tr.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
					LayoutParams.WRAP_CONTENT));


			tr.setBackgroundColor(rowColor);


			TextView data_x = new TextView(this);
			// data_x.setTextColor(Color.WHITE);
			data_x.setGravity(17);
			data_x.setText(x + "");


			TextView data_y = new TextView(this);
			data_y.setGravity(17);
			data_y.setText(y + "");


			TextView data_z = new TextView(this);
			data_z.setGravity(17);
			data_z.setText(z + "");


			tr.addView(data_x);
			tr.addView(data_y);
			tr.addView(data_z);


			dataTable.addView(tr);


		} catch (Exception ex) {


		}
	}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="fill_parent" android:layout_height="fill_parent">




	<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
		android:id="@+id/myTableLayout" android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:stretchColumns="*"
		android:background="#ffffff">
		<TableRow>
			<TextView android:id="@+id/row_x" android:text="X"
				android:background="#000000" android:layout_margin="1dip" />
			<TextView android:id="@+id/row_y" android:text="Y"
				android:background="#000000" android:layout_margin="1dip" />
			<TextView android:id="@+id/row_z" android:text="Z"
				android:background="#000000" android:layout_margin="1dip" />
		</TableRow>
	</TableLayout>


</LinearLayout>