You should always specify the minSdkVersion attribute for your application.This value represents the lowest Android SDK version your application supports.
For example, if your application requires APIs introduced in Android SDK 1.6, you would check that SDK's documentation and find that this release is defined as API Level 4.Therefore, add the following to your Android Manifest file within the <manifest> tag block:
<uses-sdk android:minSdkVersion="4" />
It's that simple.You should use the lowest API level possible if you want your application to be compatible with the largest number of Android handsets. However, you must ensure that your application is tested sufficiently on any non-target platforms (any API level supported below your target SDK, as described in the next section).
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