ContentProvider

ContentProvider简单使用事例

AndroidManifest配置

<!-- authorities 主机名 -->
<provider
     android:name="com.glinkus.icare.contentProvider.ContactProvider"     
   android:authorities="com.android.glinkus.icare.ContactProvider" >
</provider>

自定义ContentProvider

package com.glinkus.icare.contentProvider;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;

import com.glinkus.icare.db.DBHelper;

/**
 * <p>Title:ContactProvider</p>
 * <p>Description: </p>
 * @author syz
 * @date 2015-12-23
 */
public class ContactProvider extends ContentProvider {

    private static final String CONTENT_AUTHORITY = "com.android.glinkus.icare.ContactProvider";

    private static final String BASE_CONTENT_URL ="content://"+CONTENT_AUTHORITY+"/";

    private static final Uri QUERY_CONTACT_NAME_URL = Uri.parse(BASE_CONTENT_URL+"contact");

    private DBHelper helper;

    private SQLiteDatabase db;

    private static UriMatcher uriMatcher;

    static{
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.match(QUERY_CONTACT_NAME_URL);
    }

    @Override
    public boolean onCreate() {
        helper = new DBHelper(getContext());
        return helper != null ?true:false;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        db = helper.getReadableDatabase();
        Cursor cursor = db.query("tb_contact", null, "call_id = ?", selectionArgs, null, null, null);
        return cursor;
    }

    @Override
    public String getType(Uri uri) {
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        return null;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        return 0;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        return 0;
    }

}

调用

        String imageUrl = null;
        String query_uri = "content://com.android.glinkus.icare.ContactProvider/contact";
        Uri uri = Uri.parse(query_uri);
        Cursor cursor = getContentResolver().query(uri, null, null, new String[] { callNumber }, null);
        if (cursor != null && cursor.getCount() > 0) {
            cursor.moveToFirst();
            String nickName = cursor.getString(cursor.getColumnIndex("name"));
            if (!TextUtils.isEmpty(nickName)) {
                this.nickName = nickName;
            } else {
                // this.nickName = getString(R.string.unknown);
            }
            nameTextView.setText(nickName);
            if (cursor != null) {
                cursor.close();
            }

        }
        return imageUrl;