2016-06-19.md

date	status	title
2016-06-19 16:38	public	内容提供器拾遗

###读取系统联系人 需要添加权限

private void readContacts() {
        Cursor cursor = null;
        //查询联系人数据
        cursor = getContentResolver().query(
                ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                null,
                null,
                null,
                null);
        try {

            if (cursor.moveToFirst()) {
                do {
                    //获取联系人姓名
                    String contactName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                    //获取联系人号码
                    String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                } while (cursor.moveToNext());
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }

    }

###创建内容提供器

package com.cky.cgoodday;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.net.Uri;
import android.support.annotation.Nullable;

/**
 * Created by cuikangyuan on 16/6/19.
 */
public class MyProvider extends ContentProvider {


    public static final int TABLE1_DIR = 0;

    public static final int TABLE1_ITEM = 1;

    public static final int TABLE2_DIR = 2;

    public static final int TABLE2_ITEM = 3;

    private static UriMatcher uriMatcher;

    static {
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.addURI("com.example.app.provider", "table1", TABLE1_DIR);
        uriMatcher.addURI("com.example.app.provider", "table1/#", TABLE1_ITEM);
        uriMatcher.addURI("com.example.app.provider", "table2", TABLE2_DIR);
        uriMatcher.addURI("com.example.app.provider", "table2/#", TABLE2_ITEM);
    }

    @Override
    public boolean onCreate() {
        return false;
    }

    @Nullable
    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {

        switch (uriMatcher.match(uri)) {
            case TABLE1_DIR:
                //查询table1表中所有数据
                break;
            case TABLE1_ITEM:
                //查询table1表中单条数据
                break;
            case TABLE2_DIR:
                //查询table2表中所有数据
                break;
            case TABLE2_ITEM:
                //查询table1表中单条数据
                break;
            default:
                break;
        }

        return null;
    }

    @Nullable
    @Override
    public String getType(Uri uri) {

        switch (uriMatcher.match(uri)) {
            case TABLE1_DIR:
                return "vnd.android.cursor.dir/vnd.com.example.app.provider.table1";
            case TABLE1_ITEM:
                return "vnd.android.cursor.item/vnd.com.example.app.provider.table1";
            case TABLE2_DIR:
                return "vnd.android.cursor.dir/vnd.com.example.app.provider.table2";
            case TABLE2_ITEM:
                return "vnd.android.cursor.item/vnd.com.example.app.provider.table2";
            default:
                break;
        }

        return null;
    }

    @Nullable
    @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;
    }
}

清单文件中配置

<provider
android:name = "内容提供器类的全名"
android:authorities = "内容提供器的权限"
android:exported = "true"//表示该内容提供器可以被其他应用程序访问
>
</provider>

调用内容提供器的方法

Uri uri = Uri.parse("content://com.example.app.provider/table1");
getContentResolver().query();
getContentResolver().insert();
getContentResolver().delete();
getContentResolver().update();