Intent.getData文件()在尝试读取设备上的联系人数据时为空

但是当我试着在运行2.1的设备上调试它时 data.getData() 返回null。我把这个放在箱子里了AndroidManifest.xml文件 <uses-permission android:name="android.permission.READ_CONTACTS"/>

任何人都有任何想法。我是android新手,谢谢。

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

        Button btnTest = (Button) findViewById(R.id.btnTest);
        btnTest.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_PICK, People.CONTENT_URI);

                startActivityForResult(intent, ACTIVITY_PICK_CONTACT);
            }
        });
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
        case (ACTIVITY_PICK_CONTACT):
            if (resultCode == Activity.RESULT_OK) {
                // This is where it is broke
                            Uri uri = data.getData();

                Intent intent = new Intent(this, PickContactInfo.class);
                intent.putExtra(Keys.CONTACT_URI, uri.toString());
                startActivity(intent);
            }
            break;
        }

    };