Java 如何在 Android 中将 TextView 添加到 LinearLayout
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How to add a TextView to LinearLayout in Android
提问by Martin
I am trying to add TextViewsto my xml-defined layout in code.
I have a xml-sheet, where a lot of Viewsare defined. But I have to add some views in code, so a create a LinearLayoutin the xml-sheet:
我试图TextViews在代码中添加到我的 xml 定义的布局。我有一个 xml 表，其中Views定义了很多。但是我必须在代码中添加一些视图，所以LinearLayout在 xml-sheet 中创建一个：
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:id="@+id/info"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>
And in this layout, I like to add my TextView:
在这个布局中，我喜欢添加我的TextView：
View linearLayout = findViewById(R.id.info);
//LinearLayout layout = (LinearLayout) findViewById(R.id.info);
TextView valueTV = new TextView(this);
valueTV.setText("hallo hallo");
valueTV.setId(5);
valueTV.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
((LinearLayout) linearLayout).addView(valueTV);
But I only get the following error message:
但我只收到以下错误消息：
: java.lang.ClassCastException: android.widget.TextView
How can I do it?
我该怎么做？
Thanks for you help. Martin
谢谢你的帮助。马丁
回答by Ben
try using
尝试使用
LinearLayout linearLayout = (LinearLayout)findViewById(R.id.info);
...
linearLayout.addView(valueTV);
also make sure that the layout params you're creating are LinearLayout.LayoutParams...
还要确保您正在创建的布局参数是 LinearLayout.LayoutParams...
回答by penguin359
You need to access the layout via it's layout resource, not an id resource which is not guaranteed unique. The resource reference should look like R.layout.my_cool_layout where your above XML layout is stored in res/layout/my_cool_layout.xml.
您需要通过布局资源访问布局，而不是不能保证唯一的 id 资源。资源引用应类似于 R.layout.my_cool_layout，其中您的上述 XML 布局存储在 res/layout/my_cool_layout.xml 中。
回答by Pushpendra Kuntal
Hey i have checked your code, there is no serious error in your code. this is complete code:
嘿，我已经检查了您的代码，您的代码中没有严重错误。这是完整的代码：
main.xml:-
main.xml:-
<?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/info"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>
this is Stackoverflow.java
这是 Stackoverflow.java
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.TextView;
public class Stackoverflow extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View linearLayout = findViewById(R.id.info);
//LinearLayout layout = (LinearLayout) findViewById(R.id.info);
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);
}
}
copy this code, and run it. it is completely error free. take care...
复制这段代码，然后运行它。它完全没有错误。小心...
回答by Deepak
You can add a TextViewto your linear layout programmatically like this:
您可以TextView像这样以编程方式将 a 添加到您的线性布局：
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.mylayout);
TextView txt1 = new TextView(MyClass.this);
linearLayout.setBackgroundColor(Color.TRANSPARENT);
linearLayout.addView(txt1);
回答by Zapnologica
LinearLayout.LayoutParams layoutParams ;
layoutParams= new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
回答by user3509153
Here's where the exception occurs
这是发生异常的地方
((LinearLayout) linearLayout).addView(valueTV);
addViewmethod takes in a parameter of type View, not TextView. Therefore, typecast the valueTv object into a View object, explicitly.
addView方法接受类型为 的参数View，而不是TextView. 因此，明确地将 valueTv 对象类型转换为 View 对象。
Therefore, the corrected code would be :
因此，更正后的代码将是：
((LinearLayout) linearLayout).addView((TextView)valueTV);
回答by vaibhav jain
for(int j=0;j<30;j++) {
LinearLayout childLayout = new LinearLayout(MainActivity.this);
LinearLayout.LayoutParams linearParams = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
childLayout.setLayoutParams(linearParams);
TextView mType = new TextView(MainActivity.this);
TextView mValue = new TextView(MainActivity.this);
mType.setLayoutParams(new TableLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT, 1f));
mValue.setLayoutParams(new TableLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT, 1f));
mType.setTextSize(17);
mType.setPadding(5, 3, 0, 3);
mType.setTypeface(Typeface.DEFAULT_BOLD);
mType.setGravity(Gravity.LEFT | Gravity.CENTER);
mValue.setTextSize(16);
mValue.setPadding(5, 3, 0, 3);
mValue.setTypeface(null, Typeface.ITALIC);
mValue.setGravity(Gravity.LEFT | Gravity.CENTER);
mType.setText("111");
mValue.setText("111");
childLayout.addView(mValue, 0);
childLayout.addView(mType, 0);
linear.addView(childLayout);
}
回答by Ntheitroad
You should use something similar to this for adding TextView to LinearLayout dynamically:
您应该使用类似于此的内容将 TextView 动态添加到 LinearLayout：
LinearLayout linearLayout = getActivity().findViewById(R.id.infoLayout);
TextView valueTV = new TextView(context);
valueTV.setText("hallo hallo");
valueTV.setId(Integer.parseInt("5"));
valueTV.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
linearLayout.addView(valueTV);
getActivity() is used for inside Fragments, you can use context or anything similar per each instance you are inside.
getActivity() 用于内部 Fragment，您可以为每个内部实例使用上下文或任何类似的东西。
