Question

我正在开发一个装载机和列表视图简单的应用程它与whatsapp的CONTACTS选项卡列表完全相同。此应用程序从移动设备获取联系人，并在列表项中显示名称和图像。你可以在这里找到片段代码。

import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.SimpleCursorAdapter;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.ImageView;
import android.widget.ResourceCursorAdapter;
import android.widget.TextView;

import java.io.InputStream;


public class TabThreeFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor> {

    MyCursorAdapter mAdapter;
    SimpleCursorAdapter s;
    public static final  String TAG = "TabThreeFragment";

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        setEmptyText("No phone numbers");

        mAdapter  = new MyCursorAdapter(getActivity(), R.layout.contact_list_item, null, 0 );

        setListAdapter(mAdapter);

        getLoaderManager().initLoader(0, null, this);
    }

    static final String[] CONTACTS_SUMMARY_PROJECTION = new String[] {
            ContactsContract.Contacts._ID,
            ContactsContract.Contacts.DISPLAY_NAME,
            ContactsContract.Contacts.CONTACT_STATUS,
            ContactsContract.Contacts.CONTACT_PRESENCE,
            ContactsContract.Contacts.PHOTO_ID,
            ContactsContract.Contacts.LOOKUP_KEY,
    };

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {

        Log.d(TAG, "onCreateLoader");
        Uri baseUri = ContactsContract.Contacts.CONTENT_URI;

        String select = "((" + ContactsContract.Contacts.DISPLAY_NAME + " NOTNULL) AND ("
                + ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1) AND ("
                + ContactsContract.Contacts.DISPLAY_NAME + " != '' ))";

        return new CursorLoader(getActivity(), baseUri,
                CONTACTS_SUMMARY_PROJECTION, select, null,
                ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        Log.d(TAG, "onLoadFinished");
        mAdapter.swapCursor(data);
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        mAdapter.swapCursor(null);
    }


    class MyCursorAdapter extends ResourceCursorAdapter{

        public MyCursorAdapter(Context context, int layout, Cursor c, int flags) {
            super(context, layout, c, flags);
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            TextView contactName = (TextView) view.findViewById(R.id.textView1);
            contactName.setText(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));

            ImageView imageView = (ImageView) view.findViewById(R.id.profileImage);
            Bitmap profileImage = getPhoto(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID)));

            //TextView ID = (TextView) view.findViewById(R.id.textView2);
            if(profileImage !=null)
            {
                 imageView.setImageBitmap(profileImage);
            }
        }

        private Bitmap getPhoto(String id){
            Log.d(TAG, id + "-----");
            Bitmap photo = null;
            try{
                InputStream inputStream = ContactsContract.Contacts.openContactPhotoInputStream(
                        getActivity().getContentResolver(),
                        ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI , new Long(id).longValue()));
                if(inputStream != null)
                    photo= BitmapFactory.decodeStream(inputStream);
            }catch (Exception e){

            }
            return photo;
        }
    }
}

列出项目布局文件： - contact_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content" android:gravity="center_vertical" android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp" android:layout_marginTop="6dp" android:layout_marginBottom="6dp">

    <ImageView android:id="@+id/profileImage"
        android:src="@drawable/ic_launcher"
        android:layout_weight="0"  android:layout_width="50dp"
        android:layout_height="50dp"/>

    <LinearLayout android:orientation="vertical"
        android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="6dp"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="Medium Text"
            android:id="@+id/textView1" />

        <TextView
            android:id="@+id/textView2"
            android:paddingLeft="6dp"
            android:textSize="16dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Dummy Content fro subtile"
           />

    </LinearLayout>>

</LinearLayout>

我的问题，应用程序会显示联系人详细信息和照片，但每次上下滚动时照片都会发生变化。这意味着一个联系信息显示与其他联系人的照片。

我错过了什么吗？

Answer 1

使用

if(profileImage !=null){
      imageView.setImageBitmap(profileImage);
}else{
      imageView.setImageDrawable(null);
}

在你的getview（）

中

滚动列表视图时显示错误的联系人照片

1 个答案: