为什么选择了接触之前的onActivityResult叫？ [英] Why is onActivityResult is called before a contact is chosen?

问题描述

我下面的回答 http://stackoverflow.com/a/867828/129805 添加联系人选择器我的应用程序。

问题是，的onActivityResult 是立即的与正确的 REQ code调用（ PICK_CONTACT ），但与结果$ C $的ç 0 和空数据。

这是的不的再次调用，在用户实际选取一个联系人。

该AndroidManifest给出了这样的活动的android：launchMode =singleInstance＆GT; 因为我只希望这是一个实例

我做了什么错？

MainActivity.java：

  @覆盖
保护无效的onCreate（捆绑savedInstanceState）{
    ...
    addContactButton =（按钮）findViewById（R.id.addContactButton）;
    addContactButton.setOnClickListener（新View.OnClickListener（）{
        @覆盖
        公共无效的onClick（视图v）{
            意向意图=新意图（Intent.ACTION_PICK，ContactsContract.Contacts.CONTENT_URI）;
            startActivityForResult（意向，PICK_CONTACT）;
        }
    }）;
}@覆盖
公共无效的onActivityResult（INT REQ code，INT结果code，意图数据）{
    Log.d（TAG的onActivityResult）;
    super.onActivityResult（REQ code，结果code，数据）;    开关（REQ code）{
        案例（PICK_CONTACT）：
            如果（结果code == Activity.RESULT_OK）{
                乌里联络资料= data.getData（）;
                光标C = getContentResolver（）查询（联络资料，NULL，NULL，NULL，NULL）;
                如果（c.moveToFirst（））{
                    字符串名称= c.getString（c.getColumnIndex（ContactsContract.Contacts.DISPLAY_NAME））;
                    //不管你要对选定联系人姓名做TODO。
                    Log.d（TAG，你选择了+名字+。）;
                }
            }
            打破;
    }
}
 

解决方案

该singleInstance立即触发回调。你有更多的相关信息<一个href=\"http://stackoverflow.com/questions/7910840/android-startactivityforresult-immediately-triggering-onactivityresult\">link

I'm following the answer http://stackoverflow.com/a/867828/129805 to add a contact picker to my app.

The problem is that onActivityResult is immediately invoked with the correct reqCode (PICK_CONTACT), but with aresultCode of 0 and a null for data.

It is not invoked again, when the user actually picks a contact.

The AndroidManifest gives this activity android:launchMode="singleInstance"> as I only ever want there to be one instance.

What have I done wrong?

MainActivity.java:

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    addContactButton = (Button) findViewById(R.id.addContactButton);
    addContactButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI);
            startActivityForResult(intent, PICK_CONTACT);
        }
    });
}

@Override
public void onActivityResult(int reqCode, int resultCode, Intent data) {
    Log.d(TAG, "onActivityResult");
    super.onActivityResult(reqCode, resultCode, data);

    switch (reqCode) {
        case (PICK_CONTACT) :
            if (resultCode == Activity.RESULT_OK) {
                Uri contactData = data.getData();
                Cursor c =  getContentResolver().query(contactData, null, null, null, null);
                if (c.moveToFirst()) {
                    String name = c.getString(c.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
                    // TODO Whatever you want to do with the selected contact name.
                    Log.d(TAG, "you chose " + name + ".");
                }
            }
            break;
    }
}

解决方案

The singleInstance fires the callback immediately. You have more info in this link

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