Java 无法使用联系人选择器

我是android编程新手。 我无法从活动中调用联系人选取器。 我参考了很多教程，对代码进行了相应的格式化，但没有得到任何结果

MainActivity.java的代码是：-

    package com.example.intents;


import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Contacts;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends Activity {


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        MenuInflater mi=getMenuInflater();
        mi.inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void invokeForRes(View view)
    {
        Intent in=new Intent(Intent.ACTION_PICK,Contact.Contacts.CONTENT_URI);

        startActivityForResult(in, 1);
    }

}

请帮帮我。。。。。。。

---

提前谢谢。

使用

联系人Contact.Contacts.CONTENT\u URI

，而不是

联系人.Contacts.CONTENT\u URI

。后者是安卓1.x联系人提供商，在2009年底发布的安卓2.0中被

ContactsContract

取代

/***
  Copyright (c) 2008-2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain   a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS,   WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
 */

package com.commonsware.android.rotation.bundle;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.Button;

public class RotationBundleDemo extends Activity {
  static final int PICK_REQUEST=1337;
  Button viewButton=null;
  Uri contact=null;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    viewButton=(Button)findViewById(R.id.view);
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode,
                                  Intent data) {
    if (requestCode == PICK_REQUEST) {
      if (resultCode == RESULT_OK) {
        contact=data.getData();
        viewButton.setEnabled(true);
      }
    }
  }

  public void pickContact(View v) {
    Intent i=
        new Intent(Intent.ACTION_PICK,
                   ContactsContract.Contacts.CONTENT_URI);

    startActivityForResult(i, PICK_REQUEST);
  }

  public void viewContact(View v) {
    startActivity(new Intent(Intent.ACTION_VIEW, contact));
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

    if (contact != null) {
      outState.putParcelable("contact", contact);
    }
  }

  @Override
  protected void onRestoreInstanceState(Bundle state) {
    super.onRestoreInstanceState(state);

    contact=state.getParcelable("contact");
    viewButton.setEnabled(contact != null);
  }
}

---

（from）

onActivityResult方法在哪里。因为我首先是初学者，所以我只是尝试调用contact picker活动。只是循序渐进@YugeshContact选择器是否将被调用。