インスタンス化でnullpointerexception

３８行目のTextView mTextView = new TextView(this);でエラーが起きているようです。表示する段階でnullならエラーが出るのがまだ分かるですが、なぜインスタンス化する段階でこのようなエラーが出るのでしょうか。そして解決するにはどのようにしたらいいのでしょうか？

public class MainActivity extends Activity implements Runnable, SensorEventListener {
    private static final float ACCEL_WEIGHT = 3f;
    SensorManager manager;
    Ball ball;
    EnemyBall eball1;
    EnemyBall eball2;
    Handler handler;
    Handler mHandler;
    int width, height, time;
    float gx, gy, dpi;
    int mLaptime = 0;
    Timer mTimer = new Timer(true);
38. TextView mTextView = new TextView(this);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().addFlags(
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        FrameLayout framelayout = new FrameLayout(this);
        framelayout.setBackgroundColor(Color.WHITE);
        setContentView(framelayout);
        time = 1;
        handler = new Handler();
        mHandler = new Handler();
        dpi = getResources().getDisplayMetrics().densityDpi;

        framelayout.addView(mTextView);
        mTimer.schedule( new TimerTask(){
            @Override
            public void run() {
                // mHandlerを通じてUI Threadへ処理をキューイング
                mHandler.post( new Runnable() {
                    public void run() {

                        //実行間隔分を加算処理
                        mLaptime +=  1;

                        //計算にゆらぎがあるので小数点第1位で丸める
                        BigDecimal bi = new BigDecimal(mLaptime);
                        float outputValue = bi.setScale(1, BigDecimal.ROUND_HALF_UP).floatValue();

                        //現在のLapTime
                        mTextView.setText(Float.toString(mLaptime));
                    }
                });
            }
        }, 0, 1000);

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
                                                                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
                                                                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                               at android.app.ActivityThread.access$900(ActivityThread.java:150)
                                                                               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                               at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                               at android.os.Looper.loop(Looper.java:148)
                                                                               at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                               at java.lang.reflect.Method.invoke(Native Method)
                                                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                            Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
                                                                               at android.content.ContextWrapper.getResources(ContextWrapper.java:87)
                                                                               at android.view.ContextThemeWrapper.getResources(ContextThemeWrapper.java:81)
                                                                               at android.view.View.<init>(View.java:3784)
                                                                               at android.view.View.<init>(View.java:3898)
                                                                               at android.widget.TextView.<init>(TextView.java:677)
                                                                               at android.widget.TextView.<init>(TextView.java:671)
                                                                               at android.widget.TextView.<init>(TextView.java:667)
                                                                               at android.widget.TextView.<init>(TextView.java:663)
                                                                               at com.example.k15102kk.ball.MainActivity.<init>(MainActivity.java:38)
                                                                               at java.lang.Class.newInstance(Native Method)
                                                                               at android.app.Instrumentation.newActivity(Instrumentation.java:1067)
                                                                               at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2317)
                                                                               at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                                                                               at android.app.ActivityThread.access$900(ActivityThread.java:150) 
                                                                               at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                                                                               at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                               at android.os.Looper.loop(Looper.java:148) 
                                                                               at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                               at java.lang.reflect.Method.invoke(Native Method) 
                                                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)