我正在开发一个Android应用程序.我是XML的新手.我收到的消息是“没有XML内容.请在文档中添加根视图或布局”下面给出了XML代码.请帮忙
<?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" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/ref"
android:textSize="15dp"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/ref2"
android:textSize="15dp"/>
<EditText
android:id="@+id/uname"
android:layout_width="150dp"
android:layout_height="25dp"
android:inputType="text"
android:ems="5" >
<requestFocus />
</EditText>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/ref3"
android:textSize="15dp"/>
<EditText
android:id="@+id/pwd"
android:layout_width="150dp"
android:layout_height="25dp"
android:inputType="text"
android:ems="5" />
<Button
android:layout_width="60dp"
android:layout_height="35dp"
android:text="@string/ref"
android:id="@+id/bLogin" />
</LinearLayout>
—-主要活动代码—
package com.android.disasteralertApp;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
Button login;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
login =(Button) findViewById(R.id.bLogin);
}
}
----Manifest----
[2012-04-17 00:34:20 - disaster Alert App] res\layout\main.xml:0: error: Resource entry main is already defined.
[2012-04-17 00:34:20 - disaster Alert App] res\layout\main.out.xml:0: Originally defined here.
[2012-04-17 00:34:20 - disaster Alert App] C:\Users\Acer\workspace\disaster Alert App\res\layout\main.out.xml:1: error: Error parsing XML: no element found
[2012-04-17 01:05:59 - disaster Alert App] res\layout\main.xml:0: error: Resource entry main is already defined.
[2012-04-17 01:05:59 - disaster Alert App] res\layout\main.out.xml:0: Originally defined here.
[2012-04-17 01:05:59 - disaster Alert App] C:\Users\Acer\workspace\disaster Alert App\res\layout\main.out.xml:1: error: Error parsing XML: no element found
[2012-04-17 01:11:14 - disaster Alert App] res\layout\main.xml:0: error: Resource entry main is already defined.
[2012-04-17 01:11:14 - disaster Alert App] res\layout\main.out.xml:0: Originally defined here.
[2012-04-17 01:11:14 - disaster Alert App] C:\Users\Acer\workspace\disaster Alert App\res\layout\main.out.xml:1: error: Error parsing XML: no element found
[2012-04-17 01:14:56 - disaster Alert App] ------------------------------
[2012-04-17 01:14:56 - disaster Alert App] Android Launch!
[2012-04-17 01:14:56 - disaster Alert App] Connection with adb was interrupted.
[2012-04-17 01:14:56 - disaster Alert App] 0 attempts have been made to reconnect.
[2012-04-17 01:14:56 - disaster Alert App] You may want to manually restart adb from the Devices view.
[2012-04-17 01:17:27 - disaster Alert App] Error in an XML file: aborting build.
[2012-04-17 01:37:10 - disaster Alert App] res\layout\main.xml:0: error: Resource entry main is already defined.
[2012-04-17 01:38:42 - disaster Alert App] res\layout\main.xml:0: error: Resource entry main is already defined.
[2012-04-17 01:38:42 - disaster Alert App] res\layout\main.out.out.xml:0: Originally defined here.
[2012-04-17 01:38:42 - disaster Alert App] C:\Users\Acer\workspace\disaster Alert App\res\layout\main.out.out.xml:1: error: Error parsing XML: no element found
[2012-04-17 01:39:28 - disaster Alert App] Error in an XML file: aborting build.
解决方法:
哦 – 看到’main.out.xml’?当你用eclipse启动XML文件时会发生什么.只需删除’out’xml并保留main.xml
当你点击Play时,一定要选择/编辑.java文件,否则eclipse会产生’out.xml’而无法启动.
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