Examples of problems encountered in Android development

When I was debugging and running the Andorid project on my mobile phone today, I found that the Console printed out a warning message like "WARNING: Application does not specify an API level requirement!", as shown in the figure below:

Although it does not affect the normal operation of the project, we still need to find out the reason. I checked the reason for the warning online. It turns out that the Min SDK Version was not specified in the AndroidManifest.xml file when creating the project.

Solution: Modify the AndroidManifest.xml file and add the following code between :

Use android:minSdkVersion to specify the run The minimum SDK version of this Android application, minSdkVersion="8" indicates the version of Android 2.2 used, android:targetSdkVersion indicates the SDK version used to compile this Android application, targetSdkVersion="21" indicates the version of Android 5.0.1 used.

After adding the configuration item of the node, if the node does not set the android:allowBackup attribute, then set android for the node :allowBackup="true" attribute, otherwise a warning message will appear on the node. The content of the modified AndroidManifest.xml file is as follows:

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