在工作中碰到一个场景,就是你APP的Application是需要继承自家的Application,但是你在接入别人的SDK时,有的sdk接入要求你的Application继承他家的Application,这就比较尴尬了.Java只能单继承这可怎么是好?
接口代理就可以用上了.
首先我们让清单文件声明的Multiapplication继承代理类ProxyApplication,通过super.的方式在对用的生命周期中调用代理类的对应方法:
/**
* @author guiyanbing
* @date ：2019-4-28
* @version 1.0
* @parameter 使用接口代理实现application的多继承
* @since
* @return
*/
public class Multiapplication extends ProxyApplication {
private static final String TAG = Multiapplication.class.getSimpleName();
@Override
public void attachBaseContext(Context base){
super.attachBaseContext(base);
Log.d(TAG, "attachBaseContext");
}
@Override
public void onCreate() {
super.onCreate();
Log.d(TAG, "onCreate");
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Log.d(TAG, "onConfigurationChanged");
}
}
在代理类ProxyApplication 中我们通过反射和接口回调的方式调用实现类ImplementApplication的对应方法:
/**
* @author guiyanbing
* @date ：2019-4-28
* @version 1.0
* @parameter 使用接口代理实现application的多继承
* @since
* @return
/
public class ProxyApplication extends Application {
private IApplicationListener listener;
@Override
public void attachBaseContext(Context base){
super.attachBaseContext(base);
this.listener = initProxyApplication();
if(this.listener != null){
this.listener.onProxyAttachBaseContext(base);
}
}
@Override
public void onCreate() {
super.onCreate();
if(listener != null){
listener.onProxyCreate();
}
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if(this.listener != null){
this.listener.onProxyConfigurationChanged(newConfig);
}
}
private IApplicationListener initProxyApplication() {
try {
Class clazz = Class.forName("cn.app.ImplementApplication");
return (IApplicationListener)clazz.newInstance();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return null;
}
}
在实现类ImplementApplication中我们还是用接口回调加代理的方式来调用调用我们要继承的多个Appliction的生命周期方法:
/**
* @author guiyanbing
* @date ：2019-4-28
* @version 1.0
* @parameter 使用接口代理实现application的多继承
* @since
* @return
*/
public class ImplementApplication extends Application implements IApplicationListener {
private IFishApplicationListener fishApplicationListener;
private IEgameApplicationListener egameApplicationListener;
@Override
public void onProxyAttachBaseContext(Context base) {
super.attachBaseContext(base);
this.fishApplicationListener = initFishApplication();
if(this.fishApplicationListener != null){
this.fishApplicationListener.onFishAttachBaseContext(base);
}
this.egameApplicationListener = initEgameApplication();
if(this.egameApplicationListener != null){
this.egameApplicationListener.onEgameAttachBaseContext(base);
}
}
@Override
public void onProxyCreate() {
super.onCreate();
if (fishApplicationListener != null) {
fishApplicationListener.onFishCreate();
}
if (egameApplicationListener != null) {
egameApplicationListener.onEgameCreate();
}
}
@Override
public void onProxyConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if(this.fishApplicationListener != null){
this.fishApplicationListener.onFishConfigurationChanged(newConfig);
}
this.egameApplicationListener = initEgameApplication();
if(this.egameApplicationListener != null){
this.egameApplicationListener.onEgameConfigurationChanged(newConfig);
}
}
private IFishApplicationListener initFishApplication() {
try {
Class clazz = Class.forName("cn.app.ImplementFishApplication");
return (IFishApplicationListener)clazz.newInstance();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return null;
}
private IEgameApplicationListener initEgameApplication() {
try {
Class clazz = Class.forName("cn.app.ImplementEgameApplication");
return (IEgameApplicationListener)clazz.newInstance();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return null;
}
}
然后就到了最让我们兴奋的时候了,我们可以使用ImplementFishApplication和ImplementEgameApplication两个类来分别继承不同的Application
/**
* @author guiyanbing
* @date ：2019-4-28
* @version 1.0
* @parameter 使用接口代理实现application的多继承
* @since
* @return
*/
public class ImplementFishApplication extends FishApplication implements IFishApplicationListener {
@Override
public void onFishAttachBaseContext(Context base) {
super.attachBaseContext(base);
}
@Override
public void onFishCreate() {
super.onCreate();
}
@Override
public void onFishConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
}
public class ImplementEgameApplication extends EgameApplication implements IEgameApplicationListener {
@Override
public void onEgameCreate() {
super.onCreate();
}
@Override
public void onEgameAttachBaseContext(Context base) {
super.attachBaseContext(base);
}
@Override
public void onEgameConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
}
至此我们只要将Multiapplication 声明在清单文件中就可以实现同时继承并跑EgameApplication 和FishApplication 的生命周期了,各SDK的初始化也一并得到运行.
public interface IEgameApplicationListener {
public void onEgameCreate();
public void onEgameAttachBaseContext(Context base);
public void onEgameConfigurationChanged(Configuration newConfig);
}
public interface IFishApplicationListener {
public void onFishHunterCreate();
public void onFishHunterAttachBaseContext(Context base);
public void onFishHunterConfigurationChanged(Configuration newConfig);
}
public interface IApplicationListener {
public void onProxyCreate();
public void onProxyAttachBaseContext(Context base);
public void onProxyConfigurationChanged(Configuration newConfig);
}
