ContentProvider 数据的存取和共享

AndroidManifest.xml文件注册

    android:name=".provider.InfoDataProvider"
    android:authorities="com.h.lo.provider"
    android:exported="true"/>

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

import com.hybunion.ipos.greendao.bean.GreenDaoManager;
import com.hybunion.ipos.greendao.bean.MerInfoBean;
import com.hybunion.ipos.utils.Constants;

/**
 * Created by hxs on 2016/8/16.
 */
public class InfoDataProvider extends ContentProvider {

    private final static String AUTHORITY = "com.h.lo.provider";
    private static UriMatcher uriMatcher;


    private static final int GET_MID = 200;//mid
    private static final int GET_TID = 201;//tid


    private static final int SET_TID = 202;//设置TID
    private static final int SET_MID = 203;//设置MID
    private static final int SET_MERINFOBYMID = 204;//通过mid设置商户信息
    private static final int GET_MERINFOBYMID = 205;//通过mid取得商户信息

    static {

        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);

        uriMatcher.addURI(AUTHORITY, "getTid", GET_TID);
        uriMatcher.addURI(AUTHORITY, "getMid", GET_MID);
        uriMatcher.addURI(AUTHORITY, "getMerInfoByMid", GET_MERINFOBYMID);

        uriMatcher.addURI(AUTHORITY, "setTid", SET_TID);
        uriMatcher.addURI(AUTHORITY, "setMid", SET_MID);
        uriMatcher.addURI(AUTHORITY, "setMerInfoByMid", SET_MERINFOBYMID);

    }

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

    @Nullable
    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        int code = uriMatcher.match(uri);
        MerInfoBean merBeanquery = GreenDaoManager.getInstance().getMerInfoById(Constants.MERINFOINDEX);
        switch (code) {
            case GET_MID:
                String mid = merBeanquery.getMid();

                String[] columns = new String[]{Constants.MID};
                MatrixCursor cursor2 = new MatrixCursor(columns);
                cursor2.addRow(new String[]{mid});
                return cursor2;

            case GET_TID:
                String tid = merBeanquery.getTid();

                String[] columns3 = new String[]{Constants.TID};
                MatrixCursor cursor3 = new MatrixCursor(columns3);
                cursor3.addRow(new String[]{tid});
                return cursor3;

            case GET_MERINFOBYMID:
                String merinfobymid = merBeanquery.getMerInfo();

                String[] columns4 = new String[]{Constants.MerInfoByMid};
                MatrixCursor cursor4 = new MatrixCursor(columns4);
                cursor4.addRow(new String[]{merinfobymid});

                return cursor4;

            default:
                throw new IllegalArgumentException("Unknow Uri :" + uri);
        }

    }

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

    @Nullable
    @Override
    public Uri insert(Uri uri, ContentValues values) {
        int code = uriMatcher.match(uri);
  
        switch (code) {

            case SET_TID:
                String tid = values.getAsString(Constants.TID);
                merBeaninsert.setTid(tid);
               
                break;
            case SET_MID:
                String mid = values.getAsString(Constants.MID);
                merBeaninsert.setMid(mid);
               
                break;
            case SET_MERINFOBYMID:
                String merByMid = values.getAsString(Constants.MerInfoByMid);
                merBeaninsert.setMerInfo(merByMid);
               
                break;
        }

        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;
    }
}

set的地方的方法：

Uri uri = Uri.parse("content://com.h.lo.provider/setMid");
ContentValues values = new ContentValues();
values.put(Constants.MID, aId);
getContentResolver().insert(uri, values);

Uri uri = Uri.parse("content://com.h.lo.provider/setTid");
ContentValues values = new ContentValues();
values.put(Constants.TID, aId);
getContentResolver().insert(uri, values);

Uri uri = Uri.parse("content://com.h.lo.provider/setMerInfoByMid");
ContentValues values = new ContentValues();
values.put(Constants.MerInfoByMid, merInfoStr);
getContentResolver().insert(uri, values);

使用时get地方的方法：

ContentResolver provider = this.getContentResolver();

Cursor cursorMid;

try {
    //mid
    Uri uriMid = Uri.parse("content://com.h.lo.provider/getMid");
    cursorMid = provider.query(uriMid, null, null, null, null);
    if (null != cursorMid) {
        cursorMid.moveToFirst();
        mid = cursorMid.getString(0);
        LogUtil.e("yy+++----getMid=", mid);

        cursorMid.close();
    }
} catch (Exception e) {
    e.printStackTrace();
}

Cursor cursorTid;
try {
    Uri uriTid = Uri.parse("content://com.h.lo.provider/getTid");
    cursorTid = provider.query(uriTid, null, null, null, null);
    if (null != cursorTid) {
        cursorTid.moveToFirst();
        tid = cursorTid.getString(0);
        LogUtil.e("yy+++----getTid=", tid);

        cursorTid.close();
    }
} catch (Exception e) {
    e.printStackTrace();
}

Cursor cursorMerInfo;
try {
    Uri uriMerInfo = Uri.parse("content://com.h.lo.provider/getMerInfoByMid");
    cursorMerInfo = provider.query(uriMerInfo , null, null, null, null);
    if (null != cursorMerInfo) {
        cursorMerInfo.moveToFirst();
        merInfo= cursorMerInfo.getString(0);
        LogUtil.e("yy+++----getMerInfo=", merInfo);

        cursorMerInfo.close();
    }
} catch (Exception e) {
    e.printStackTrace();
}