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https://github.com/shiraji/android-context-inject
Dagger2でのContextのInjectを検証します。
https://github.com/shiraji/android-context-inject
Last synced: 23 days ago
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Dagger2でのContextのInjectを検証します。
- Host: GitHub
- URL: https://github.com/shiraji/android-context-inject
- Owner: shiraji
- License: mit
- Created: 2016-06-01T16:08:52.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2016-06-01T21:51:55.000Z (over 8 years ago)
- Last Synced: 2024-10-30T02:42:41.512Z (2 months ago)
- Language: Java
- Size: 97.7 KB
- Stars: 2
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# android-context-inject
Dagger2でのContextのInjectを検証します。
Sorry No English description at this moment
## 行いたいこと
ContextをApplication/Activity/Fragmentのscopeにより注入分けを行いたい。
## 問題
`Context`を返す`Provides`のメソッドが複数あるため、`ActivityModule`にinjectし、Contextを注入しようとするとコンパイルエラーになる。
```java
@Module
public class AppModule {
private Context context;
public AppModule(Application app) {
context = app;
}
@Provides
public Context provideContext() {
return context;
}
}
```
```java
@Module
public class ActivityModule {
final AppCompatActivity activity;
public ActivityModule(AppCompatActivity activity) {
this.activity = activity;
}
@Provides
public Context provideContext() { // ここが重複した定義になってしまう。
return activity;
}
}
```
## 検証
`@Named`を使ってみました。
```java
@Module
public class AppModule {
private Context context;
public AppModule(Application app) {
context = app;
}
@Named("applicationContext")
@Provides
public Context provideContext() {
return context;
}
}
```
```java
public class MainActivity extends AppCompatActivity {
@Named("applicationContext")
@Inject
Context applicationContext;
@Named("activityContext")
@Inject
Context activityContext;
@Inject
SomeModel someModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MyApplication.getComponent(this).inject(this);
Log.d("MainActivity", "activityContext: " + activityContext);
Log.d("MainActivity", "applicationContext: " + applicationContext);
Log.d("MainActivity", "-----------------------------------------");
Intent intent = new Intent(this, SubActivity.class);
startActivity(intent);
}
}
```
```java
public class SubActivity extends AppCompatActivity {
@Named("applicationContext")
@Inject
Context applicationContext;
@Named("activityContext")
@Inject
Context activityContext;
@Inject
SomeModel someModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MyApplication.getComponent(this).inject(this);
Log.d("SubActivity", "activityContext: " + activityContext);
Log.d("SubActivity", "applicationContext: " + applicationContext);
}
}
```
### ログ出力
```
D/MainFragment: applicationContext: com.github.shiraji.android_context_inject.MyApplication@f0cecc2
D/MainFragment: activityContext: com.github.shiraji.android_context_inject.MainActivity@8b01ad3
D/MainFragment: fragmentContext: com.github.shiraji.android_context_inject.MainActivity@8b01ad3
D/SomeModel: applicationContext: com.github.shiraji.android_context_inject.MyApplication@f0cecc2
D/SomeModel: activityContext: com.github.shiraji.android_context_inject.MainActivity@8b01ad3
D/MainActivity: activityContext: com.github.shiraji.android_context_inject.MainActivity@8b01ad3
D/MainActivity: applicationContext: com.github.shiraji.android_context_inject.MyApplication@f0cecc2
D/MainActivity: -----------------------------------------
D/MainFragment: applicationContext: com.github.shiraji.android_context_inject.MyApplication@f0cecc2
D/MainFragment: activityContext: com.github.shiraji.android_context_inject.SubActivity@c055ec3
D/MainFragment: fragmentContext: com.github.shiraji.android_context_inject.SubActivity@c055ec3
D/SomeModel: applicationContext: com.github.shiraji.android_context_inject.MyApplication@f0cecc2
D/SomeModel: activityContext: com.github.shiraji.android_context_inject.SubActivity@c055ec3
D/SubActivity: activityContext: com.github.shiraji.android_context_inject.SubActivity@c055ec3
D/SubActivity: applicationContext: com.github.shiraji.android_context_inject.MyApplication@f0cecc2
```
### 懸念事項
* fragmentContextはいらない
* context持ち続けないかちょっと心配。(dagger2の仕様を把握していないための不安)
* contextを注入していいことあるよね？
* contextをInjectする場合、必ず`@Named`で明記する必要がある