这是我的第一个 android程序，下面是 错误信息

忘了告诉你们了，我是在android模拟器下运行的，没有用手机跑

[2014-08-21 00:00:28 - test] ------------------------------

[2014-08-21 00:00:28 - test] Android Launch!

[2014-08-21 00:00:28 - test] adb is running normally.

[2014-08-21 00:00:28 - test] Performing com.example.test.MainActivity activity launch

[2014-08-21 00:00:28 - test] Uploading test.apk onto device '94488e54'

[2014-08-21 00:00:28 - test] Installing test.apk...

[2014-08-21 00:00:29 - test] Installation error: INSTALL_CANCELED_BY_USER

[2014-08-21 00:00:29 - test] Please check logcat output for more details.

[2014-08-21 00:00:29 - test] Launch canceled!

这是代码

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="com.example.test.MainActivity" >

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="姓名"

android:textSize="28sp"

/>

android:id="@+id/editText1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignBottom="@+id/textView1"

android:layout_alignParentRight="true"

android:layout_marginRight="17dp"

android:ems="10"

android:hint="请输入姓名" />