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一般情况下我们会通过startActivity()来启动一个activity，但是如果我们想获得要启动的activity的结果的时候就需要调用startActivityForResult().并且重写 onActivityResult() 。 static final int PICK_CONTACT_REQUEST = 1;  // The request code ... private void pickContact() {     Intent pickContactIntent = new Intent(Intent.ACTION_PICK, Uri.parse("content://contacts"));     pickContactIntent.setType(Phone.CONTENT_TYPE); // Show user only contacts w/ phone numbers     startActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST); } 得到结果 @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {     // Check which request we're responding to     if (requestCode == PICK_CONTACT_REQUEST) {         // Make sure the request was successful         if (resultCode == RESULT_OK) {             // The user picked a contact.             // The Intent's data Uri identifies which contact was selected.             // Do something with the contact here (bigger example below)         }     } } 注意要判断requestCode == PICK_CONTACT_REQUEST 且resultCode == RESULT_OK。 如上所示：onActivityResult 是用Intent 来返回数据的。这个时候我们就可以通过Intent的getData()来获得数据.

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