java - setOnCheckedChangeListener 中的 NullPointerException

Question

我的程序有问题。我会给我的 Switches CheckedChangeListener 并成为 NullPointerException :( 在第 37 行它发生了。请帮助我:) 请不要谴责我的英语，我住在德国......我的代码是：

private ActionBar actionBar;
TabActivity tabActivity;
private TabHost tabHost;
private TabHost.TabSpec theSpec;
private Intent intent;
private Switch statusCall, statusSMS;

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

    actionBar = getActionBar();
    actionBar.hide();

    tabHost = getTabHost();

    statusCall = (Switch)findViewById(R.id.statuscall);
    statusSMS = (Switch)findViewById(R.id.statussms);
    statusCall.setOnCheckedChangeListener(this);
    statusSMS.setOnCheckedChangeListener(this);

    // BlitzLeuchte-Tab
    intent = new Intent(this, DieBlitzLeuchte.class);
    theSpec = tabHost.newTabSpec("einleitung")
            .setIndicator("Einleitung/Hintergrund")
            .setContent(intent);
    tabHost.addTab(theSpec);

    // Einstellungs-Tab
    intent = new Intent(this, Einstellungen.class);
    theSpec = tabHost.newTabSpec("einstellungen")
            .setIndicator("Einstellungen")
            .setContent(intent);
    tabHost.addTab(theSpec);


    checkFlashLightAvailable();
}

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

public void checkFlashLightAvailable() {
    if (getBaseContext().getPackageManager().hasSystemFeature(
            PackageManager.FEATURE_CAMERA_FLASH)) {
        Toast toast = Toast.makeText(getBaseContext(),
                "Erfolgreich gestartet!", Toast.LENGTH_LONG);
        toast.show();
    } else {
        Toast noFlashLight = Toast.makeText(getBaseContext(),
                "Es wurde kein Flash-Light gefunden!", Toast.LENGTH_LONG);
        noFlashLight.show();
    }
}

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    switch(buttonView.getId()) {

    case R.id.statuscall: 
        boolean checkedCall = ((Switch) buttonView).isChecked();
        CallReceiver.CallReceiverStatus=checkedCall;
    break;
    case R.id.statussms:
        boolean checkedSMS = ((Switch) buttonView).isChecked();
        SMSReceiver.broadCastReceiverStatus=checkedSMS;
}

}

}