在Java中创建LinearLayout-未显示元素

试试这个，

  LinearLayout layout = new LinearLayout(this);        layout.setOrientation(LinearLayout.VERTICAL);        layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));        TextView titleView = new TextView(this);        LayoutParams lparams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);        titleView.setLayoutParams(lparams);        titleView.setTextAppearance(this, android.R.attr.textAppearanceLarge);        titleView.setText("Hallo Welt!");        layout.addView(titleView);        setContentView(layout);