- The document discusses creating an Android Studio plugin to generate CreateIntent methods for passing data between activities. - It provides examples of how code generator plugins work by modifying the code in the current file based on the cursor position. The plugin would generate the CreateIntent method code based on the fields in the class. - The key aspects of creating such a plugin involve using the Android Studio API to access the current file and class, generate the method code as a PsiElement, and insert it into the class. This allows automatically generating boilerplate code to reduce errors and effort.

1. Android Studio Plugin 作ってみた
〜 CreateIntent method Generator 〜
関西モバイルアプリ研究会 #9
Ryo Sotoyama

2. 自己紹介
● 外山 椋 (そとやま りょう)
● シーサー株式会社
● Androidアプリ開発

3. private int mIntVal;
private long mLongVal;
private String mStringVal;
private ArrayList<String> mStringList;
問題点: Activityへのデータ渡し

4. 問題点: Activityへのデータ渡し
private int mIntVal;
private long mLongVal;
private String mStringVal;
private ArrayList<String> mStringList;
public static Intent createIntent(Context context, int intVal, long
longVal, String stringVal, ArrayList<String> stringList) {
Intent intent = new Intent(context, SampleActivity.class);
intent.putExtra(ARG_INT_VAL, intVal);
intent.putExtra(ARG_LONG_VAL, longVal);
intent.putExtra(ARG_STRING_VAL, stringVal);
intent.putStringArrayListExtra(ARG_STRING_LIST, stringList);
}
public void restore(Intent intent) {
this.mIntVal = intent.getIntExtra(ARG_INT_VAL, -1);
this.mLongVal = intent.getLongExtra(ARG_LONG_VAL, -1L);
this.mStringVal = intent.getStringExtra(ARG_STRING_VAL);
this.mStringList = intent.getStringArrayListExtra(ARG_STRING_LIST);
}

5. つらい :(

6. Solution
● Android Studio(IntelliJ) Plugin
● Android Processing Tool (APT)

7. Solution
● Android Studio(IntelliJ) Plugin
● Android Processing Tool (APT)

8. Plugin Example
Code Generator
● ButterKnife Zelezny
● ParcelableGenerator
Navigation
● Dagger IntelliJ Plugin
● Otto IntelliJ Plugin

9. Intentへ値の出し入れする
プラグイン作ってみた

10. CreateIntent method Generator

12. どんなプログラムでプラグインが
作られているか軽く紹介
例：int s = 1; をクラス内に生成するプラグイン

13. Code Generator Plugin
public class ActionClass extends AnAction {
@Override
public void actionPerformed(AnActionEvent e) {
}
}

14. Code Generator Plugin
public class ActionClass extends AnAction {
@Override
public void actionPerformed(AnActionEvent e) {
final Project project = e.getProject();
final Editor editor = e.getData(DataKeys.EDITOR);
final PsiFile file = PsiUtilBase.getPsiFileInEditor(editor, project);
}
}

15. Code Generator Plugin
public class ActionClass extends AnAction {
@Override
public void actionPerformed(AnActionEvent e) {
final Project project = e.getProject();
final Editor editor = e.getData(DataKeys.EDITOR);
final PsiFile file = PsiUtilBase.getPsiFileInEditor(editor, project);
new WriteCommandAction.Simple(project, file) {
@Override
protected void run() throws Throwable {
}
}.execute();
}
}

16. Code Generator Plugin
public class ActionClass extends AnAction {
@Override
public void actionPerformed(AnActionEvent e) {
final Project project = e.getProject();
final Editor editor = e.getData(DataKeys.EDITOR);
final PsiFile file = PsiUtilBase.getPsiFileInEditor(editor, project);
new WriteCommandAction.Simple(project, file) {
@Override
protected void run() throws Throwable {
generate(project, file, editor);
}
}.execute();
}
}

17. private void generate(Project project, PsiFile file, Editor editor){
// fieldインスタンス作成
PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
PsiField field = elementFactory.createFieldFromText("int s = 1;", null);
}
Code Generator Plugin

18. private void generate(Project project, PsiFile file, Editor editor){
// fieldインスタンス作成
PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
PsiField field = elementFactory.createFieldFromText("int s = 1;", null);
// カーソルのある場所のクラスを取得
PsiElement element = file.findElementAt(editor.getCaretModel().getOffset());
PsiClass psiClass = PsiTreeUtil.getParentOfType(element, PsiClass.class);
}
Code Generator Plugin

19. private void generate(Project project, PsiFile file, Editor editor){
// fieldインスタンス作成
PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
PsiField field = elementFactory.createFieldFromText("int s = 1;", null);
// カーソルのある場所のクラスを取得
PsiElement element = file.findElementAt(editor.getCaretModel().getOffset());
PsiClass psiClass = PsiTreeUtil.getParentOfType(element, PsiClass.class);
// 実際のクラス内にフィールド追加
JavaCodeStyleManager styleManager = JavaCodeStyleManager.getInstance(project);
PsiElement element1 =
styleManager.shortenClassReferences(psiClass.addBefore(field, psiClass.getLastChild()));
}
Code Generator Plugin

20. Code Generator Plugin: Result
public class GenerateSampleClass {
}
public class GenerateSampleClass {
int s = 1;
}

21. 最初にフィールドを取得して型によって生成する文を変えれば
CreateIntent method Generatorみたいなのが作れる！