I am new to Eclipse and Android programming and trying to teach myself how to create Android applications. The problem is that applications will not run in the emulator.

• I installed the Eclipse SDK version: 3.7.2.

• I installed Android SDK and AVD

• I created the HelloWorld application from Eclipse.

• Press F11 to launch HelloWorld.

• Mesasge appears: "The adb connection is down and a serious error has occurred."

• There is no Android emulator.

• Check the android sdk directory, there is adb.exe.

• Press F11 again,

• Android emulator is running, but HelloWorld application is not working

• There is no "HelloWorld" application in the application manager.

• I uninstall R.java and run it again, the result is the same (no HelloWorld application).

• adb.exe , ( HelloWorld).

main.xml

<?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/hello" />

    <TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="This is my first Android Application" />

    <Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="And this is a clickable button" />

    </LinearLayout>

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