How to change target build on Android project?

Another way on the command line if you are using ant is to use the android.bat script (Windows) or android script (Mac). It's in $SDK_DIR/tools.

If you say,

android.bat update project --path .  --target "android-8"

it will regenerate your build.xml, AndroidManifest.xml, etc.

There are three ways to resolve this issue.

Right click the project and click "Properties". Then select "Android" from left. You can then select the target version from right side.
Right Click on Project and select "run as" , then a drop down list will be open.
Select "Run Configuration" from Drop Down list.Then a form will be open , Select "Target" tab from "Form" and also select Android Version Api , On which you want to execute your application, it is a fastest way to check your application on different Target Version.
Edit the following elements in the AndroidManifest.xml file

xml:

<uses-sdk android:minSdkVersion="3" />
<uses-sdk android:targetSdkVersion="8" />

Right click the project and click "Properties". Then select "Android" from the tree on the left. You can then select the target version on the right.

(Note as per the popular comment below, make sure your properties, classpath and project files are writable otherwise it won't work)

You can change your the Build Target for your project at any time:

Right-click the project in the Package Explorer, select Properties, select Android and then check the desired Project Target.
Edit the following elements in the AndroidManifest.xml file (it is in your project root directory)

In this case, that will be:
```
<uses-sdk android:minSdkVersion="3" />
<uses-sdk android:targetSdkVersion="8" />
```
Save it
Rebuild your project.

Click the Project on the menu bar, select Clean...
Now, run the project again.

Right Click Project name, move on Run as, and select Android Application

By the way, reviewing Managing Projects from Eclipse with ADT will be helpful. Especially the part called Creating an Android Project.

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