AAPT：错误：“#ffffff”与可绘制属性 (attr) 引用不兼容

Question

I'm new to android programming so what I did was I created an application.

I made a backup of the whole application folder so I can repaste it again if ever I had troubles.

Now that I copy and pasted the backup files to the current project folder. Everything went nuts.

An error saying

"AAPT: error: '#ffffff' is incompatible with attribute drawable (attr) reference."

"AAPT: error: resource style/AppTheme.AppBarOverlay (aka com.example.reviewerapplication:style/AppTheme.AppBarOverlay) not found."

"AAPT: error: attribute navGraph (aka com.example.reviewerapplication:navGraph) not found."

That is just 3 samples of the 100+ errors with the same "AAPT" on it.

Can anyone please help me...

Answer 1

"AAPT: error: '#ffffff' is incompatible with attribute drawable (attr) reference."

You are using a color in a drawable attribute. You have to use a drawable resources ( @drawable/... )

"AAPT: error: resource style/AppTheme.AppBarOverlay (aka com.example.reviewerapplication:style/AppTheme.AppBarOverlay) not found."

You are linking the @style/AppTheme.AppBarOverlay but it doesn't exist in your res/values/styles.xml file.

"AAPT: error: attribute navGraph (aka com.example.reviewerapplication:navGraph) not found."

It seems that you have to add in your build.gradle some dependencies:

dependencies {
  def nav_version = "2.3.0-rc01"

  implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
  implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
}