java无法检索整数getHeight（）

Question

我以编程方式创建了一个Layout“布局”，然后在同一布局中创建了一个TextView以显示layout{}，类中没有其他方法或任何其他内容。不幸的是，应用程序关闭了，我不知道为什么

LinearLayout layout =new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);
        layout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));
        LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        lparams.setMargins(0, 10, 0, 10);
        lparams.gravity= Gravity.CENTER;


        TextView fimText = new TextView(this);
        fimText.setLayoutParams(lparams);
        fimText.setText(layout.getHeight());
        layout.addView(fimText, lparams);
        setContentView(layout);

Answer 1

在调用getHeight之前，需要将LinearLayout添加到容器中。此外，getHeight返回一个int，因此需要将其转换为字符串

试试这个：

LinearLayout layout =new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);
layout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));
LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,     LinearLayout.LayoutParams.WRAP_CONTENT);
lparams.setMargins(0, 10, 0, 10);
lparams.gravity= Gravity.CENTER;

setContentView(layout);

TextView fimText = new TextView(this);
fimText.setLayoutParams(lparams);
fimText.setText(String.valueOf(layout.getHeight()));
layout.addView(fimText, lparams);