編輯：關於Android編程
這段時間學習別人的源碼，需要AndroidAnnotations這個開源的框架，學習下，他的地在：https://github.com/excilys/androidannotations文檔的地址在：https://github.com/excilys/androidannotations/wiki 正如在github上他的主頁上所說：Fast Android Development. Easy maintenance.它具有快速Android開發，易於維護的優點。
特點：
@EActivity(R.layout.translate) // Sets content view to R.layout.translate
public class TranslateActivity extends Activity {
@ViewById // Injects R.id.textInput
EditText textInput;
@ViewById(R.id.myTextView) // Injects R.id.myTextView
TextView result;
@AnimationRes // Injects android.R.anim.fade_in
Animation fadeIn;
@Click // When R.id.doTranslate button is clicked
void doTranslate() {
translateInBackground(textInput.getText().toString());
}
@Background // Executed in a background thread
void translateInBackground(String textToTranslate) {
String translatedText = callGoogleTranslate(textToTranslate);
showResult(translatedText);
}
@UiThread // Executed in the ui thread
void showResult(String translatedText) {
result.setText(translatedText);
result.startAnimation(fadeIn);
}
// [...]
}//===================================================================
AndroidAnnotations works in a very simple way. It automatically adds an extra compilation step that generates source code, using the standard Java Annotation Processing Tool.
What source code ? For each enhanced class, for example each @EActivity annotated activity, a subclass of
this activity is generated, with the same name plus an underscore appended at the end.(會生成一個子類)
For instance, the following class:
package com.some.company;
@EActivity
public class MyActivity extends Activity {
// ...
}
Will generate the following subclass, in the same package but in another source folder:(生成一個MyActivity_的子類)
package com.some.company;
public final class MyActivity_ extends MyActivity {
// ...
}
This subclass adds behavior to your activity by overriding some methods (for instanceonCreate()), yet delegating
the calls to super.
That is the reason why you must add _ to your activity names in AndroidManifest.xml:（清單文件中這樣配置生成的子類）
In Android, you usually start an activity this way:
startActivity(this, MyListActivity.class);
However, with AndroidAnnotations, the real activity that must be started isMyListActivity_:
startActivity(this, MyListActivity_.class);
Since AndroidAnnotations 2.4
We provide a static helper to let you start the generated activity:
// Starting the activity MyListActivity_.intent(context).start(); // Building an intent from the activity Intent intent = MyListActivity_.intent(context).get(); // You can provide flags MyListActivity_.intent(context).flags(FLAG_ACTIVITY_CLEAR_TOP).start(); // You can even provide extras defined with @Extra in the activity MyListActivity_.intent(context).myDateExtra(someDate).start();
Since AndroidAnnotations 2.7
You can also use the startActivityForResult() equivalent:
MyListActivity_.intent(context).startForResult();
In Android, you usually start a service this way:
startService(this, MyService.class);
However, with AndroidAnnotations, the real Service that must be started is MyService_:
startService(this, MyService_.class);
Since AndroidAnnotations 2.7
We provide a static helper to let you start the generated service:
// Starting the service MyService_.intent(context).start(); // Building an intent from the activity Intent intent = MyService_.intent(context).build(); // You can provide flags MyService_.intent(context).flags(Intent.FLAG_GRANT_READ_URI_PERMISSION).start(
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