diff --git a/app/build.gradle b/app/build.gradle
index 1bdcb348..92c12454 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -20,6 +20,7 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    buildToolsVersion '28.0.2'
     //apk file name
     android.applicationVariants.all { variant ->
         variant.outputs.all {
diff --git a/app/src/main/res/mipmap-hdpi/dingding.jpg b/app/src/main/res/mipmap-hdpi/dingding.jpg
deleted file mode 100644
index 98f9ebaa..00000000
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diff --git a/app/src/main/res/mipmap-hdpi/dingding.png b/app/src/main/res/mipmap-hdpi/dingding.png
new file mode 100644
index 00000000..37537b31
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diff --git a/app/src/main/res/mipmap-hdpi/dingding_round.png b/app/src/main/res/mipmap-hdpi/dingding_round.png
new file mode 100644
index 00000000..699084cd
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diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
index add64efd..adcb7385 100644
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diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
index af2d5089..adcb7385 100644
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diff --git a/app/src/main/res/mipmap-hdpi/qywx.png b/app/src/main/res/mipmap-hdpi/qywx.png
index 91e36127..645cdc8e 100644
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diff --git a/app/src/main/res/mipmap-hdpi/qywx_foreground.png b/app/src/main/res/mipmap-hdpi/qywx_foreground.png
index 2432fb61..645cdc8e 100644
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diff --git a/app/src/main/res/mipmap-hdpi/qywx_round.png b/app/src/main/res/mipmap-hdpi/qywx_round.png
index 359d9db6..64cca3d0 100644
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diff --git a/app/src/main/res/mipmap-mdpi/dingding.jpg b/app/src/main/res/mipmap-mdpi/dingding.jpg
deleted file mode 100644
index 98f9ebaa..00000000
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diff --git a/app/src/main/res/mipmap-mdpi/dingding.png b/app/src/main/res/mipmap-mdpi/dingding.png
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index 00000000..9645f218
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diff --git a/app/src/main/res/mipmap-mdpi/dingding_round.png b/app/src/main/res/mipmap-mdpi/dingding_round.png
new file mode 100644
index 00000000..17ccddae
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diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.png b/app/src/main/res/mipmap-mdpi/ic_launcher.png
index 4d63c259..6b4a7d55 100644
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diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
index 886e713a..6b4a7d55 100644
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diff --git a/app/src/main/res/mipmap-mdpi/qywx.png b/app/src/main/res/mipmap-mdpi/qywx.png
index 2ca8a36e..7248493f 100644
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diff --git a/app/src/main/res/mipmap-mdpi/qywx_foreground.png b/app/src/main/res/mipmap-mdpi/qywx_foreground.png
index 2db98a6a..7248493f 100644
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diff --git a/app/src/main/res/mipmap-mdpi/qywx_round.png b/app/src/main/res/mipmap-mdpi/qywx_round.png
index 22c8f494..31ddce10 100644
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diff --git a/app/src/main/res/mipmap-xhdpi/dingding.jpg b/app/src/main/res/mipmap-xhdpi/dingding.jpg
deleted file mode 100644
index 98f9ebaa..00000000
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diff --git a/app/src/main/res/mipmap-xhdpi/dingding.png b/app/src/main/res/mipmap-xhdpi/dingding.png
new file mode 100644
index 00000000..0a30bfd8
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diff --git a/app/src/main/res/mipmap-xhdpi/dingding_round.png b/app/src/main/res/mipmap-xhdpi/dingding_round.png
new file mode 100644
index 00000000..0f2ecaae
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diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
index e5b4b58e..fe092f64 100644
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diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
index da2eaf06..fe092f64 100644
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diff --git a/app/src/main/res/mipmap-xhdpi/qywx.png b/app/src/main/res/mipmap-xhdpi/qywx.png
index 5d37674e..678a8615 100644
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diff --git a/app/src/main/res/mipmap-xhdpi/qywx_foreground.png b/app/src/main/res/mipmap-xhdpi/qywx_foreground.png
index 0aefb27f..678a8615 100644
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diff --git a/app/src/main/res/mipmap-xhdpi/qywx_round.png b/app/src/main/res/mipmap-xhdpi/qywx_round.png
index c1026191..d35238cd 100644
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diff --git a/app/src/main/res/mipmap-xxhdpi/dingding.jpg b/app/src/main/res/mipmap-xxhdpi/dingding.jpg
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index 98f9ebaa..00000000
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diff --git a/app/src/main/res/mipmap-xxhdpi/dingding.png b/app/src/main/res/mipmap-xxhdpi/dingding.png
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diff --git a/app/src/main/res/mipmap-xxhdpi/dingding_round.png b/app/src/main/res/mipmap-xxhdpi/dingding_round.png
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index 00000000..cd6a1705
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diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
index 4c275d62..dffb9c35 100644
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diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
index 67ae2da1..dffb9c35 100644
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diff --git a/app/src/main/res/mipmap-xxhdpi/qywx.png b/app/src/main/res/mipmap-xxhdpi/qywx.png
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index 7e685ddd..3d509edf 100644
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diff --git a/app/src/main/res/mipmap-xxhdpi/qywx_round.png b/app/src/main/res/mipmap-xxhdpi/qywx_round.png
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diff --git a/app/src/main/res/mipmap-xxxhdpi/bark.png b/app/src/main/res/mipmap-xxxhdpi/bark.png
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diff --git a/app/src/main/res/mipmap-xxxhdpi/dingding_round.png b/app/src/main/res/mipmap-xxxhdpi/dingding_round.png
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diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
index 8097392c..ac330efb 100644
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diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
index 1edf2294..ac330efb 100644
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