1.Program type already present
依賴包沖突
All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 27.1.1, 25.3.0. Examples include com.android.support:animated-vector-drawable:27.1.1 and com.android.support:design:25.3.0 less... (Ctrl+F1)
There are some combinations of libraries, or tools and libraries, that are incompatible, or can lead to bugs. One such incompatibility is compiling with a version of the Android support libraries that is not the latest version (or in particular, a version lower than your targetSdkVersion.)
若按提示加入
//noinspection GradleCompatible
編譯不會出現問題但在調試的時候就會報錯
看提示應該是com.android.support:design版本和com.android.support:appcompat中顯示的版本沖突，這時候把design版本置換即可，在dependencies中加入：
implementation 'com.android.support:design:27.1.1'
2.Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
textview綁定錯誤，檢查xml文件下id或xml文件是否綁定正確
3.Attempt to invoke interface method 'boolean java.util.List.add(java.lang.Object)' on a null object reference
原因：定義了 List<E> lists; 但並沒有初始化
解決方法：
在使用前加入：
List<E> lists = new ArrayList<>();
4.Error:Unable to start the daemon process.
This problem might be caused by incorrect configuration of the daemon.
For example, an unrecognized jvm option is used.
解決方法：
找到gradle.properties文件，將為注釋掉的內容更換為：
org.gradle.jvmargs=-Xmx512m
然后重啟項目