Android巧用Fragment解耦onActivityResult详解
前言
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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:
public class OnActResultEventDispatcherFragment extends Fragment{ public static final String TAG = "on_act_result_event_dispatcher"; public int mRequestCode = 0x11; private SparseArraymCallbacks = new SparseArray<>(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); } public void startForResult(Intent intent, ActResultRequest.Callback callback) { // mRequestCode与callback需要一一对应 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,谢谢大家对创新互联的支持。
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