About Android studio error: (26,13) failed to resolve: com.android.support : appcompat-v7:27. + error

Error: as shown in the figure

Some methods in mianactivity will report errors:

At the beginning, I thought that the SDK was faulty, because I always thought that my SDK was not installed properly. Then I repeatedly installed Android studio. Those who included the SDK and didn’t package the SDK came several times, and I repeatedly installed the SDK (this is a sad story) Finally, with the help of Baidu boss, we can solve this problem


1. Open build.gradle

2. Replace the release method comment with “repositories {maven {URL” https://maven.google.com “}” is as follows:

3、clean project

The solution effect is as follows:

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