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我已经使用 Android Studio 创建了新应用程序并更改了 onCreate 方法：

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

    if (savedInstanceState == null) {
        getFragmentManager().beginTransaction()
                .add(R.id.activity_main, new PlaceholderFragment())
                .commit();
    }

    int width = 400;
    int height = 20;
    RelativeLayout.LayoutParams params;
    params = new RelativeLayout.LayoutParams(
            width,
            height
    );
    params.leftMargin = 20;
    params.topMargin = 200;

    TextView textView = new TextView(this);
    textView.setText("Text Added dinamically");
    textView.setLayoutParams(params);

    FrameLayout activityMain = (FrameLayout) findViewById(R.id.activity_main);
    activityMain.addView(textView);

}

我希望在距离顶部 200 处看到“动态添加的文本”。事实上，它似乎是顶部的快照。我怎样才能解决这个问题？

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