Android 按钮无法解析为类型
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Button cannot be resolved to a type
提问by JTH
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class ProjectActivity extends Activity{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button tut1 = (Button) findViewById(R.id.tutorial1);
tut1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent("android.intent.action.TUTORIALONE"));
}
});
}
}
Followed a youtube tutorial but i am Getting an error in this line:
遵循 youtube 教程，但我在这一行中遇到错误：
setContentView(R.layout.main);
"Button cannot be resolved to a type"
“按钮无法解析为类型”
I'm new to android dev so im confused. Help!
我是 android 开发新手，所以我很困惑。帮助！
采纳答案by Jviaches
use this in your xml :
在您的 xml 中使用它：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/tutorial1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" >
</Button>
</LinearLayout>
回答by user3380020
move your cursor to "button" in your code and select "Import button(android.widget)"..
将光标移动到代码中的“按钮”并选择“导入按钮（android.widget）”..
回答by AJ.P
Try below steps: 1. Remove the import android.R (may have been accidentally imported) 2. clean the project 3. build the project again
尝试以下步骤： 1. 删除导入 android.R（可能被意外导入） 2. 清理项目 3. 再次构建项目
回答by Sambuca
Do you have a Button definied in you main.xml layout? Something like:
您是否在 main.xml 布局中定义了 Button？就像是：
<Button android:text="Click me" android:id="@+id/tutorial1"
android:layout_width="wrap_content" android:layout_height="wrap_content"/>
回答by Muhammad Nabeel Arif
Had you added follwoing in your root layout:
您是否在根布局中添加了以下内容：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" />
回答by aisha gul ahmed
Move your cursor to "button" in your code and press ALT + Enter
将光标移动到代码中的“按钮”，然后按 ALT + Enter
I bold at which you have to press alt + enter
我大胆你必须按 alt + enter
Button tut1 = **(Button)** findViewById(R.id.tutorial1);
