diff --git a/.idea/caches/build_file_checksums.ser b/.idea/caches/build_file_checksums.ser
index 51b8635..f938104 100644
Binary files a/.idea/caches/build_file_checksums.ser and b/.idea/caches/build_file_checksums.ser differ
diff --git a/app/build.gradle b/app/build.gradle
index 57c96b4..6029fea 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -4,7 +4,7 @@ android {
     compileSdkVersion 26
     defaultConfig {
         applicationId "com.xbw.sample"
-        minSdkVersion 23
+        minSdkVersion 21
         targetSdkVersion 26
         versionCode 1
         versionName "1.0"
diff --git a/douyu/build.gradle b/douyu/build.gradle
index 0b1a1f1..b450176 100644
--- a/douyu/build.gradle
+++ b/douyu/build.gradle
@@ -6,7 +6,7 @@ android {
 
 
     defaultConfig {
-        minSdkVersion 23
+        minSdkVersion 19
         targetSdkVersion 26
         versionCode 1
         versionName "1.0"