Android巧用Fragment解耦onActivityResult詳解

更新時間：2018年08月06日 10:57:18 作者：mundane

這篇文章主要給大家介紹了關于Android巧用Fragment解耦onActivityResult的相關資料，文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨著小編來一起學習學習吧

前言

最近在研究jsbridge, 一直在想怎么樣才能讓需要startActivityForResult比如打開相機拍照這樣的操作在webView中能更簡單一點, 直到我發(fā)現(xiàn)了這篇文章

兩個類，讓你再也不用實現(xiàn)onActivityResult()

看了之后, 馬上模仿了文中的代碼實現(xiàn)了一下.

Fragment:

public class OnActResultEventDispatcherFragment extends Fragment{
 public static final String TAG = "on_act_result_event_dispatcher";
 public int mRequestCode = 0x11;
 private SparseArray<ActResultRequest.Callback> mCallbacks = new SparseArray<>();

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setRetainInstance(true);
 }

 public void startForResult(Intent intent, ActResultRequest.Callback callback) {
  // mRequestCode與callback需要一一對應
  mCallbacks.put(mRequestCode, callback);
  startActivityForResult(intent, mRequestCode);
  mRequestCode++;
 }

 @Override
 public void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);

  ActResultRequest.Callback callback = mCallbacks.get(requestCode);
  mCallbacks.remove(requestCode);

  if (callback != null) {
   callback.onActivityResult(resultCode, data);
  }
 }
}

ActResultRequest:

public class ActResultRequest {
 private OnActResultEventDispatcherFragment fragment;

 public ActResultRequest(FragmentActivity activity) {
  fragment = getEventDispatchFragment(activity);
 }

 private OnActResultEventDispatcherFragment getEventDispatchFragment(FragmentActivity activity) {
  FragmentManager fragmentManager = activity.getSupportFragmentManager();


  OnActResultEventDispatcherFragment fragment = findEventDispatchFragment(fragmentManager);
  if (fragment == null) {
   fragment = new OnActResultEventDispatcherFragment();
   fragmentManager
     .beginTransaction()
     .add(fragment, OnActResultEventDispatcherFragment.TAG)
     .commitAllowingStateLoss();
   fragmentManager.executePendingTransactions();
  }
  return fragment;
 }

 private OnActResultEventDispatcherFragment findEventDispatchFragment(FragmentManager manager) {
  return (OnActResultEventDispatcherFragment) manager.findFragmentByTag(OnActResultEventDispatcherFragment.TAG);
 }

 public void startForResult(Intent intent, Callback callback) {
  fragment.startForResult(intent, callback);
 }

 public interface Callback {

  void onActivityResult(int resultCode, Intent data);
 }
}

MainActivity:

public class MainActivity extends AppCompatActivity {
 private static final String TAG = "MainActivity";
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
 }
 
 public void start(View view) {
  Intent intent = new Intent(this, SecondActivity.class);
  ActResultRequest request = new ActResultRequest(this);
  request.startForResult(intent, new ActResultRequest.Callback() {
   @Override
   public void onActivityResult(int resultCode, Intent data) {
    Log.d(TAG, "resultCode = " + resultCode);
    String name = data.getStringExtra("name");
    Log.d(TAG, "name = " + name);
    Toast.makeText(MainActivity.this, "name = " + name + ", resultCode = " + resultCode,
      Toast.LENGTH_SHORT).show();
   }
  });
 }
}

SecondActivity

public class SecondActivity extends AppCompatActivity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_second);

 }

 public void returnResult(View view) {
  Intent intent = new Intent();
  intent.putExtra("name", "mundane");
  setResult(RESULT_OK, intent);
  finish();
 }
}

按照這樣的思路, 如果需要簡化jsbridge中startActivityForResult的操作, 我們只需要把Fragment和WebView綁定在一起.比如給這個Fragment取名叫WebViewFragment, 它的布局中只有一個我們封裝好的WebView, 這個WebView需要監(jiān)聽jsbridge的所有事件我們都在fragment中寫好, 包括onActivityResult中的事件, 當然也可以在這個fragment中用一個專門的管理類來管理注冊的事件.以后Activity中有用到WebView的地方我們就直接用這個WebViewFragment就好了.也就是說, 把這個WebViewFragment, 當成我們之前的WebView.

github地址:

EasyOnActivityResult

總結

以上就是這篇文章的全部內容了，希望本文的內容對大家的學習或者工作具有一定的參考學習價值，如果有疑問大家可以留言交流，謝謝大家對腳本之家的支持。

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