android的contentProvider

发表于:，更新于:，By Sally
大纲
  1. 1. 先来个常用方法
  2. 2. 在manifest中配置
  3. 3. 定义一个内容提供者，继承contentprovider

先来个常用方法

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UriMatcher(); //用于匹配uri
ContentUri(); //获取和添加uri信息

在manifest中配置

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<provider
  android:name="包名类名全路径"
  android:authorities="" >    //该标签值随意，保证唯一就行了，一般写全类名
</provider>

定义一个内容提供者，继承contentprovider

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public class PersonContentProvider extends ContentProvider {

  // 类似电话号
  private static final String AUTHORITY = "应用程序全包名"; // 与清单文件配置的东西一致

  // 操作person表添加操作的uri匹配码
  private static final int PERSON_INSERT_CODE = 0;
  private static final int PERSON_DELETE_CODE = 1;
  private static final int PERSON_UPDATE_CODE = 2;
  private static final int PERSON_QUERY_ALL_CODE = 3;

  private static UriMatcher uriMatcher;

  private MySQLiteOpenHelper openHelper = new MySQLiteOpenHelper();

  static {

    uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);

    // 添加一些uri（类似于固话的分机号）
    //content://全包名//person/insert  增加操作的uri
    uriMatcher.addURI(AUTHORITY, "person/insert", PERSON_INSERT_CODE);
    uriMatcher.addURI(AUTHORITY, "person/delete", PERSON_DELETE_CODE);
    uriMatcher.addURI(AUTHORITY, "person/update", PERSON_UPDATE_CODE);
    uriMatcher.addURI(AUTHORITY, "person/queryAll", PERSON_QUERY_ALL_CODE);
  }

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

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

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

    @Nullable
    @Override
    public Uri insert(Uri uri, ContentValues values) {
        switch(uriMatcher.match(uri)) {  //匹配uri
          case PERSON_INSERT_CODE:       //执行insert操作
            SQLiteDatabase db = openHelper.getWritableDatabase();

            //一些列查询操作
            long id = db.insert("pserson", null, values);

            //将返回的id追加到uri的末尾
            return ContentUris.withAppendedId(uri, id);
          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;
    }
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