Question

我想在当前视图中以编程方式添加TextView。我知道如何在创建新布局时创建它，但我想将其添加到当前布局，主要问题是如何获取对main_activity布局的引用。

感谢您的回答。

Answer 1

我们假设您的项目中有LinearLayout，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:id="@+id/main"
android:layout_height="wrap_content" 
android:orientation="vertical">
</LinearLayout>

要在布局中添加许多TextView's，您可以执行以下操作：

public class YourActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        View linearLayout =  findViewById(R.id.main);


        TextView valueTV = new TextView(this);
        valueTV.setText("hallo hallo");
        valueTV.setId(5);
        valueTV.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT));

        ((LinearLayout) linearLayout).addView(valueTV);
    }
}

Answer 2

    RangeValidator1.MinimumValue = 0;
    RangeValidator1.MaximumValue = 10;
    RangeValidator1.Type = ValidationDataType.Integer;
    RangeValidator1.Validate();

    if (!RangeValidator1.IsValid)
    {
         if(Convert.ToInt32(text1.Text) < 0)
         {
            RangeValidator1.ErrorMessage = "number can not be less than 0";    
         }
         else
         {
             RangeValidator1.ErrorMessage = "number can't be above maxvalue";    
         }    
    }

如何在当前布局中以编程方式添加TextView

2 个答案: