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POCompatibility for Java library methods that require Android API level 9?
 

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  1. POCompatibility for Java library methods that require Android API level 9?
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    <p>Some Java library methods like <code>DecimalFormat.setRoundingMode</code> have a <code>@since 1.6</code> entry in their documentation.</p> <pre><code>/** ... * @since 1.6 */ public void setRoundingMode(RoundingMode roundingMode) { ... } </code></pre> <p>When I tried to use this method compiled under Android 4.2.2 and JDK 1.6 with my <code>android:minSdkVersion</code> set to 7 as shown,</p> <pre><code>myNumberFormat.setRoundingMode(RoundingMode.DOWN); </code></pre> <p>Android Lint underlined <code>setRoundingMode</code> in red for me and told me that</p> <pre><code>Call requires API level 9 (current min is 7): java.text.NumberFormat#setRoundingMode </code></pre> <p>How and <em>why</em> can the Android API restrict which Java library methods I can and cannot use? I cleaned my project and the Lint error disappeared. My project compiled with no errors and ran on a device running Android 2.2.3 (API 8).<br> My program crashed with:</p> <pre><code>05-09 11:32:38.436: E/AndroidRuntime(2074): Caused by: java.lang.NoSuchMethodError: java.text.NumberFormat.setRoundingMode </code></pre> <p>The Android documentation confirms that <a href="http://developer.android.com/reference/java/text/NumberFormat.html#setRoundingMode(java.math.RoundingMode)" rel="nofollow noreferrer">setRoundingMode</a>, <a href="http://developer.android.com/reference/java/lang/Math.html#copySign(double,%20double)" rel="nofollow noreferrer">copySign</a>, and others were added in API level 9. <strong>Does that mean that devices running Android OS level 8 and below are specifically compiled/built with JDK 1.5?</strong> </p> <p>And I can understand that. <strong>But is it impossible for the Android Support Library (or anything else) to allow us to use these methods?</strong> </p> <p>Related to <a href="https://stackoverflow.com/questions/4072313/rounding-half-up-with-decimal-format-in-android">Rounding Half Up with Decimal Format in Android</a></p>
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