Android常用开发使用全局Application

1.编写全局Application,便于管理系统启动退出时的Activity,Service等管理

public class ChatApplication extends Application {
    private List<Activity> activitys = new LinkedList<Activity>();
    
    private List<Service> services = new LinkedList<Service>();
    
    @Override
    public void onCreate() {
        super.onCreate();
    }
    
    public void addActivity(Activity activity) {
        activitys.add(activity);
    }

    public void removeActivity(Activity activity) {
        activitys.remove(activity);
    }

    public void addService(Service service) {
        services.add(service);
    }

    public void removeService(Service service) {
        services.remove(service);
    }
    
    public void closeApplication() {
        closeActivitys();
        closeServices();
    }

    private void closeActivitys() {
        ListIterator<Activity> iterator = activitys.listIterator();
        while (iterator.hasNext()) {
            Activity activity = iterator.next();
            if (activity != null) {
                activity.finish();
            }
        }
    }

    private void closeServices() {
        ListIterator<Service> iterator = services.listIterator();
        while (iterator.hasNext()) {
            Service service = iterator.next();
            if (service != null) {
                stopService(new Intent(this, service.getClass()));
            }
        }
    }
}

2. 编写AndroidManifest.xml

    <application
        android:name="com.cbooy.chat.ChatApplication"
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.cbooy.chat.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

3. 编写BaseActivity和BaseService

public abstract class BaseActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        ((ChatApplication) getApplication()).addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ((ChatApplication) getApplication()).removeActivity(this);
    }
}

public abstract class BaseService extends Service {

    @Override
    public void onCreate() {
        super.onCreate();
        
        ((ChatApplication)getApplication()).addService(this);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        
        ((ChatApplication)getApplication()).removeService(this);
    }
}

4. 编写普通Activity和Service分别继承自BaseActivity和BaseService

public class LogoActivity extends BaseActivity

这只是一个架子,以后可以在Application中放一些全局的信息,可以方便管理和调用