为什么选择了接触之前的onActivityResult叫

为什么选择了接触之前的onActivityResult叫

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问题描述

我下面的回答添加联系人选择器我的应用程序。

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

这是的的再次调用,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> 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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08-26 02:44