AndroidAnnotations开源框架

这段时间学习别人的源码,需要AndroidAnnotations这个开源的框架,学习下,他的地在:https://github.com/excilys/androidannotations文档的地址在:https://github.com/excilys/androidannotations/wiki   正如在github上他的主页上所说:Fast Android Development. Easy maintenance.它具有快速Android开发,易于维护的优点。

特点:

Features

  • Dependency injection: inject views, extras, system services, resources, ...(DI:依赖注入)
  • Simplified threading model: annotate your methods so that they execute on the UI thread or on a background thread.(简化的线程模型)
  • Event binding: annotate methods to handle events on views, no more ugly anonymous listener classes!(事件绑定)
  • REST client: create a client interface, AndroidAnnotations generates the implementation.
  • No magic: As AndroidAnnotations generate subclasses at compile time, you can check the code to see how it works.
  • AndroidAnnotations provide those good things and even more for less than 50kb, without any runtime perf impact!
先看下面的代码:
@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.(会生成一个子类)

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:(生成一个MyActivity_的子类)

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:(清单文件中这样配置生成的子类)

<activity android:name=".MyListActivity_" />

Starting an annotated activity

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);

Intent Builder

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();

Starting an annotated Service

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);

Intent Builder

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(

AvailableAnnotations

Enhanced components

Injection

Event binding

Threading

Misc

Resource injection

Rest API

Typesafe SharedPreferences

介绍到此,用到了再详细看他的文档。








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