使用框架编写Android程序-最闪啊姚凌武！

AndroidAnnotations这个开源项目为android程序的编写提供了一个新的思路，他们自己称之为框架，我觉得很像struts2的注解方式，下面是这个项目在github上面的地址 https://github.com/excilys/androidannotations 下面的代码是一个例子

Java代码

package com.googlecode.androidannotations.helloworldeclipse;
import java.util.Date;
import java.util.concurrent.TimeUnit;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.googlecode.androidannotations.annotations.Background;
import com.googlecode.androidannotations.annotations.Click;
import com.googlecode.androidannotations.annotations.EActivity;
import com.googlecode.androidannotations.annotations.LongClick;
import com.googlecode.androidannotations.annotations.SystemService;
import com.googlecode.androidannotations.annotations.Touch;
import com.googlecode.androidannotations.annotations.Transactional;
import com.googlecode.androidannotations.annotations.UiThread;
import com.googlecode.androidannotations.annotations.ViewById;
import com.googlecode.androidannotations.annotations.res.BooleanRes;
import com.googlecode.androidannotations.annotations.res.ColorRes;
import com.googlecode.androidannotations.annotations.res.StringRes;
@EActivity(R.layout.my_activity) //布局文件在这里声明，不用在setContentView
public class MyActivity extends Activity {
@ViewById //控件这样标注，由于是IOC模式，因此不需要自己实例化
EditText myEditText;
@ViewById(R.id.myTextView) //提供id来生成控件，如果不指定ID，默认以控件名进行查找，如上面的myEditText
TextView textView;
@StringRes(R.string.hello) //资源
String helloFormat;
@ColorRes
int androidColor;
@BooleanRes
boolean someBoolean;
@SystemService
NotificationManager notificationManager;
@SystemService
WindowManager windowManager;
/**
* AndroidAnnotations gracefully handles support for onBackPressed, whether
* you use ECLAIR (2.0), or pre ECLAIR android version.
*/
public void onBackPressed() {
Toast.makeText(this, "Back key pressed!", Toast.LENGTH_SHORT).show();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// windowManager should not be null
windowManager.getDefaultDisplay();
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
}
@Click //事件控制，可以以按钮的id作为方法名,同时支持的事件还有onLongClick，onTextChange等
void myButtonClicked() {
String name = myEditText.getText().toString();
setProgressBarIndeterminateVisibility(true);
someBackgroundWork(name, 5);
}
@Background //开启新线程后台运行，注意不要引用UI控件,而且返回值类型一定是void
void someBackgroundWork(String name, long timeToDoSomeLongComputation) {
try {
TimeUnit.SECONDS.sleep(timeToDoSomeLongComputation);
} catch (InterruptedException e) {
}
String message = String.format(helloFormat, name);
updateUi(message, androidColor);
showNotificationsDelayed();
}
@UiThread //UI线程
void updateUi(String message, int color) {
setProgressBarIndeterminateVisibility(false);
textView.setText(message);
textView.setTextColor(color);
}
@UiThread(delay=2000) //可以设置延时时间，以毫秒为单位
void showNotificationsDelayed() {
Notification notification = new Notification(R.drawable.icon, "Hello !", 0);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(), 0);
notification.setLatestEventInfo(getApplicationContext(), "My notification", "Hello World!", contentIntent);
notificationManager.notify(1, notification);
}
@LongClick
void startExtraActivity() {
Intent intent = new Intent(this, ActivityWithExtra_.class);
intent.putExtra(ActivityWithExtra.MY_DATE_EXTRA, new Date());
intent.putExtra(ActivityWithExtra.MY_STRING_EXTRA, "hello !");
intent.putExtra(ActivityWithExtra.MY_INT_EXTRA, 42);
startActivity(intent);
}
@Click
void startListActivity(View v) {
startActivity(new Intent(this, MyListActivity_.class));
}
@Touch
void myTextView(MotionEvent event) {
Log.d("MyActivity", "myTextView was touched!");
}
@Transactional
int transactionalMethod(SQLiteDatabase db, int someParam) {
return 42;
}
}

这个项目的好处是使用到了IOC模式，代码量小而且简洁，使程序员更多的关注于业务逻辑而不是页面，而且@Backgroud这个标签下开启的线程在线程池中管理。类似的项目还有Android Binding，RoboGuice等，有兴趣可以看一下这个文章 CLEAN CODE IN ANDROID APPLICATIONS一个Spring gay写得，很不错哦~ http://blog.springsource.com/2011/08/26/clean-code-with-android/

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使用框架编写Android程序

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