Android巧用Fragment解耦onActivityResult详解
前言
最近在研究jsbridge,一直在想怎么样才能让需要startActivityForResult比如打开相机拍照这样的操作在webView中能更简单一点,直到我发现了这篇文章
两个类，让你再也不用实现onActivityResult()
看了之后,马上模仿了文中的代码实现了一下.
Fragment:
publicclassOnActResultEventDispatcherFragmentextendsFragment{
publicstaticfinalStringTAG="on_act_result_event_dispatcher";
publicintmRequestCode=0x11;
privateSparseArraymCallbacks=newSparseArray<>();
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
publicvoidstartForResult(Intentintent,ActResultRequest.Callbackcallback){
//mRequestCode与callback需要一一对应
mCallbacks.put(mRequestCode,callback);
startActivityForResult(intent,mRequestCode);
mRequestCode++;
}
@Override
publicvoidonActivityResult(intrequestCode,intresultCode,Intentdata){
super.onActivityResult(requestCode,resultCode,data);
ActResultRequest.Callbackcallback=mCallbacks.get(requestCode);
mCallbacks.remove(requestCode);
if(callback!=null){
callback.onActivityResult(resultCode,data);
}
}
}
ActResultRequest:
publicclassActResultRequest{
privateOnActResultEventDispatcherFragmentfragment;
publicActResultRequest(FragmentActivityactivity){
fragment=getEventDispatchFragment(activity);
}
privateOnActResultEventDispatcherFragmentgetEventDispatchFragment(FragmentActivityactivity){
FragmentManagerfragmentManager=activity.getSupportFragmentManager();
OnActResultEventDispatcherFragmentfragment=findEventDispatchFragment(fragmentManager);
if(fragment==null){
fragment=newOnActResultEventDispatcherFragment();
fragmentManager
.beginTransaction()
.add(fragment,OnActResultEventDispatcherFragment.TAG)
.commitAllowingStateLoss();
fragmentManager.executePendingTransactions();
}
returnfragment;
}
privateOnActResultEventDispatcherFragmentfindEventDispatchFragment(FragmentManagermanager){
return(OnActResultEventDispatcherFragment)manager.findFragmentByTag(OnActResultEventDispatcherFragment.TAG);
}
publicvoidstartForResult(Intentintent,Callbackcallback){
fragment.startForResult(intent,callback);
}
publicinterfaceCallback{
voidonActivityResult(intresultCode,Intentdata);
}
}
MainActivity:
publicclassMainActivityextendsAppCompatActivity{
privatestaticfinalStringTAG="MainActivity";
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
publicvoidstart(Viewview){
Intentintent=newIntent(this,SecondActivity.class);
ActResultRequestrequest=newActResultRequest(this);
request.startForResult(intent,newActResultRequest.Callback(){
@Override
publicvoidonActivityResult(intresultCode,Intentdata){
Log.d(TAG,"resultCode="+resultCode);
Stringname=data.getStringExtra("name");
Log.d(TAG,"name="+name);
Toast.makeText(MainActivity.this,"name="+name+",resultCode="+resultCode,
Toast.LENGTH_SHORT).show();
}
});
}
}
SecondActivity
publicclassSecondActivityextendsAppCompatActivity{
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
}
publicvoidreturnResult(Viewview){
Intentintent=newIntent();
intent.putExtra("name","mundane");
setResult(RESULT_OK,intent);
finish();
}
}
按照这样的思路,如果需要简化jsbridge中startActivityForResult的操作,我们只需要把Fragment和WebView绑定在一起.比如给这个Fragment取名叫WebViewFragment,它的布局中只有一个我们封装好的WebView,这个WebView需要监听jsbridge的所有事件我们都在fragment中写好,包括onActivityResult中的事件,当然也可以在这个fragment中用一个专门的管理类来管理注册的事件.以后Activity中有用到WebView的地方我们就直接用这个WebViewFragment就好了.也就是说,把这个WebViewFragment,当成我们之前的WebView.
github地址:
EasyOnActivityResult
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对毛票票的支持。