我从android网站下载了最新的adt包我已经有了Eclipse Juno和最新的ADT，我已经将最新的SDK和API导入了eclipse。
然后我打开并尝试在eclipse本身证明的内置app中运行示例，但从未得到输出。
然后我决定自己创建一个简单的应用程序，我创建了一个试图运行的小应用程序，即使这样我也无法获得任何输出。然后我通过你的网站，并得到一些建议说明使用“空布局”而不是“空白布局”。我也试过那个，但没有运气。我遇到另一个建议，说明API级别21存在问题，因此将其降级为19并尝试运行但没有运气。
下面是我使用的代码，添加了“try-catch”，只是为了看看我是否可以捕获一个正确的异常。
------- Mainactivity.java ---------
package com.suresh.firstapp;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
int c;
Button add, sub;
TextView disp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
c = 0;
add = (Button) findViewById(R.id.bt_add);
sub = (Button) findViewById(R.id.bt_sub);
disp = (TextView) findViewById(R.id.textView1);
try{
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
c++;
disp.setText("Your total is: "+ c);
}
});
sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
c--;
disp.setText("Your total is: "+ c);
}
});
}
catch(Exception e){
System.out.println(e);
}
}
}
尝试使用此网站中的代码，但没有运气。
-------- activity_main.xml -----------
<!-- RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/button1"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_marginLeft="26dp"
android:layout_marginTop="38dp"
android:text="Add 1" />
<Button
android:id="@+id/button2"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="22dp"
android:text="Subtract 1" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_below="@+id/button2"
android:layout_marginTop="24dp"
android:text="@string/stmt"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout> -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Your total is 0"
android:textSize="40sp" />
<Button
android:id="@+id/bt_add"
android:layout_width="250dp"
android:layout_height="40dp"
android:layout_below="@+id/textView1"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:text="add one" />
<Button
android:id="@+id/bt_sub"
android:layout_width="250dp"
android:layout_height="40dp"
android:layout_alignLeft="@+id/bt_add"
android:layout_below="@+id/bt_add"
android:layout_marginTop="19dp"
android:text="sub one" />
</RelativeLayout>
当我尝试运行时，首先我的模拟器甚至没有开始大部分时间我收到一条消息说“未能打开HAX设备”或类似的东西，当它工作时我得到一条消息“不幸的是， FirstApp已停止“在logcat中出现以下错误
--------错误-----------
08-04 11:13:04.839: D/AndroidRuntime(1769): Shutting down VM
08-04 11:13:04.839: W/dalvikvm(1769): threadid=1: thread exiting with uncaught exception (group=0xb0d71ce8)
08-04 11:13:04.859: E/AndroidRuntime(1769): FATAL EXCEPTION: main
08-04 11:13:04.859: E/AndroidRuntime(1769): Process: com.suresh.firstapp, PID: 1769
08-04 11:13:04.859: E/AndroidRuntime(1769): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.suresh.firstapp/com.suresh.firstapp.MainActivity}: android.util.AndroidRuntimeException: You cannot combine swipe dismissal and the action bar.
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2197)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2258)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.ActivityThread.access$800(ActivityThread.java:138)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.os.Handler.dispatchMessage(Handler.java:102)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.os.Looper.loop(Looper.java:136)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.ActivityThread.main(ActivityThread.java:5026)
08-04 11:13:04.859: E/AndroidRuntime(1769): at java.lang.reflect.Method.invokeNative(Native Method)
08-04 11:13:04.859: E/AndroidRuntime(1769): at java.lang.reflect.Method.invoke(Method.java:515)
08-04 11:13:04.859: E/AndroidRuntime(1769): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
08-04 11:13:04.859: E/AndroidRuntime(1769): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
08-04 11:13:04.859: E/AndroidRuntime(1769): at dalvik.system.NativeStart.main(Native Method)
08-04 11:13:04.859: E/AndroidRuntime(1769): Caused by: android.util.AndroidRuntimeException: You cannot combine swipe dismissal and the action bar.
08-04 11:13:04.859: E/AndroidRuntime(1769): at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:275)
08-04 11:13:04.859: E/AndroidRuntime(1769): at com.android.internal.policy.impl.PhoneWindow.generateLayout(PhoneWindow.java:2872)
08-04 11:13:04.859: E/AndroidRuntime(1769): at com.android.internal.policy.impl.PhoneWindow.installDecor(PhoneWindow.java:3129)
08-04 11:13:04.859: E/AndroidRuntime(1769): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:303)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.Activity.setContentView(Activity.java:1930)
08-04 11:13:04.859: E/AndroidRuntime(1769): at com.suresh.firstapp.MainActivity.onCreate(MainActivity.java:19)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.Activity.performCreate(Activity.java:5242)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-04 11:13:04.859: E/AndroidRuntime(1769): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161)
08-04 11:13:04.859: E/AndroidRuntime(1769): ... 11 more
--------------的AndroidManifest.xml ---------------
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.suresh.firstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<category android:name="android.intent.category.DEFAULT" />
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
有人可以告诉我哪里出错了。
提前致谢
此致 苏雷什。
答案 0 :(得分：1)
activity_main.xml 文件中的错误
您输入或粘贴了两个RelativeLayout根布局。 所有xml只有一个根元素。
答案 1 :(得分：0)
您在activity_main.xml
中使用了2个不同的根元素但每个xml文档只应有一个ROOT ELEMENT
删除第二个RelativeLayout：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</RelativeLayout>
并将所有其他xml标记添加到第一个<RelativeLayout />标记中，然后重试
答案 2 :(得分：0)
尝试将SDK tergetversion降级为
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />