FragmentからstartActivityForResult

FragmentからstartActivityForResultすると、戻ってきた時にActivityのonActivityResultとFragmentのonActivityResultが呼ばれるようなので。。。覚え書き

ソースコードを見るとよくわかるね。

startActivityForResult の動作

Fragment

ActivityのstartActivityFromFragmentを呼んでます。

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1. /** 
2.  * Call {@link Activity#startActivityForResult(Intent, int)} on the fragment's 
3.  * containing Activity. 
4.  */  
5. public void startActivityForResult(Intent intent, int requestCode) {  
6.     if (mActivity == null) {  
7.         throw new IllegalStateException("Fragment " + this + " not attached to Activity");  
8.     }  
9.     mActivity.startActivityFromFragment(this, intent, requestCode);  
10. }  

/** * Call {@link Activity#startActivityForResult(Intent, int)} on the fragment's * containing Activity. */ public void startActivityForResult(Intent intent, int requestCode) { if (mActivity == null) { throw new IllegalStateException("Fragment " + this + " not attached to Activity"); } mActivity.startActivityFromFragment(this, intent, requestCode); }

FragmentActivity

requestCodeをビット演算させてActivityのsuper.startActivityForResultを呼んでます。

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1. /** 
2.  * Called by Fragment.startActivityForResult() to implement its behavior. 
3.  */  
4. public void startActivityFromFragment(Fragment fragment, Intent intent,   
5.         int requestCode) {  
6.     if (requestCode == -1) {  
7.         super.startActivityForResult(intent, -1);  
8.         return;  
9.     }  
10.     if ((requestCode&0xffff0000) != 0) {  
11.         throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");  
12.     }  
13.     super.startActivityForResult(intent, ((fragment.mIndex+1)<<16) + (requestCode&0xffff));  
14. }  

/** * Called by Fragment.startActivityForResult() to implement its behavior. */ public void startActivityFromFragment(Fragment fragment, Intent intent, int requestCode) { if (requestCode == -1) { super.startActivityForResult(intent, -1); return; } if ((requestCode&0xffff0000) != 0) { throw new IllegalArgumentException("Can only use lower 16 bits for requestCode"); } super.startActivityForResult(intent, ((fragment.mIndex+1)<<16) + (requestCode&0xffff)); }

onActivityResult の動作

FragmentActivity

requestCodeをビット演算でFragmentからstartActivityForResultActivityが実行されてるかチェックして、 FragmentのonActivityResultの呼び出しを制御しています。

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1. /** 
2.  * Dispatch incoming result to the correct fragment. 
3.  */  
4. @Override  
5. protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
6.     int index = requestCode>>16;  
7.     if (index != 0) {  
8.         index--;  
9.         if (mFragments.mActive == null || index < 0 || index >= mFragments.mActive.size()) {  
10.             Log.w(TAG, "Activity result fragment index out of range: 0x"  
11.                     + Integer.toHexString(requestCode));  
12.             return;  
13.         }  
14.         Fragment frag = mFragments.mActive.get(index);  
15.         if (frag == null) {  
16.             Log.w(TAG, "Activity result no fragment exists for index: 0x"  
17.                     + Integer.toHexString(requestCode));  
18.         } else {  
19.             frag.onActivityResult(requestCode&0xffff, resultCode, data);  
20.         }  
21.         return;  
22.     }  
23.       
24.     super.onActivityResult(requestCode, resultCode, data);  
25. }  

/** * Dispatch incoming result to the correct fragment. */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { int index = requestCode>>16; if (index != 0) { index--; if (mFragments.mActive == null || index < 0 || index >= mFragments.mActive.size()) { Log.w(TAG, "Activity result fragment index out of range: 0x" + Integer.toHexString(requestCode)); return; } Fragment frag = mFragments.mActive.get(index); if (frag == null) { Log.w(TAG, "Activity result no fragment exists for index: 0x" + Integer.toHexString(requestCode)); } else { frag.onActivityResult(requestCode&0xffff, resultCode, data); } return; } super.onActivityResult(requestCode, resultCode, data); }

Fragment

view plainprint?

1. /** 
2.  * Receive the result from a previous call to 
3.  * {@link #startActivityForResult(Intent, int)}.  This follows the 
4.  * related Activity API as described there in 
5.  * {@link Activity#onActivityResult(int, int, Intent)}. 
6.  *  
7.  * @param requestCode The integer request code originally supplied to 
8.  *                    startActivityForResult(), allowing you to identify who this 
9.  *                    result came from. 
10.  * @param resultCode The integer result code returned by the child activity 
11.  *                   through its setResult(). 
12.  * @param data An Intent, which can return result data to the caller 
13.  *               (various data can be attached to Intent "extras"). 
14.  */  
15. public void onActivityResult(int requestCode, int resultCode, Intent data) {  
16. }  

/** * Receive the result from a previous call to * {@link #startActivityForResult(Intent, int)}. This follows the * related Activity API as described there in * {@link Activity#onActivityResult(int, int, Intent)}. * * @param requestCode The integer request code originally supplied to * startActivityForResult(), allowing you to identify who this * result came from. * @param resultCode The integer result code returned by the child activity * through its setResult(). * @param data An Intent, which can return result data to the caller * (various data can be attached to Intent "extras"). */ public void onActivityResult(int requestCode, int resultCode, Intent data) { }

Y.A.M の 雑記帳: Android　Support Package の Fragment から startActivityForResult() を使うときの注意点