Android-SQLite+Contentprovide

1.dbopenhelper

public class MyDataBaseOpenHelper extends SQLiteOpenHelper{
    public MyDataBaseOpenHelper(Context context) {
        super(context, "dataforroaming.db", null, 1);
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table roamingdata(_id integer primary key autoincrement,key varchar(20),value varchar(20))");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

2.dbutils(抛出的接口)

public class MyDatabaseUtils {
  public   MyDataBaseOpenHelper myDbhelp;
    String mDbName="roamingdata";

    public MyDatabaseUtils(Context mContext) {
        super();

        this.myDbhelp=new MyDataBaseOpenHelper(mContext);

    }
    public void addRoamingIfNo(RoamingBean mBean){
        List mList=selectAllBeans();
        List allKey=new ArrayList();
      for(RoamingBean baen:mList){
      allKey.add(baen.getKey());
      }
        if(allKey.contains(mBean.getKey())){
            Log.e("have","===" +
                    "");
        }else {
            addRoaming(mBean);
        }
    }
    public long addRoaming(RoamingBean mBean){
        List mList=selectAllBeans();
        List allKey=new ArrayList();
        for(RoamingBean baen:mList){
            allKey.add(baen.getKey());
        }

        long line=0;
        if(allKey.contains(mBean.getKey())){

        }else {
        SQLiteDatabase mSqlite=myDbhelp.getReadableDatabase();
        ContentValues values=new ContentValues();
        Log.e("===",mBean.getKey()+mBean.getValue());
        values.put("key",mBean.getKey());
        values.put("value",mBean.getValue());
        line=mSqlite.insert(mDbName,null,values);
        }
        return line;
    }
    public long updateRoaming(RoamingBean mBean){
        long line=0;
        SQLiteDatabase mSqlite=myDbhelp.getReadableDatabase();
        ContentValues values=new ContentValues();
        values.put("key",mBean.getKey());
        values.put("value",mBean.getValue());
        line=mSqlite.update(mDbName,values,"key=?", new String[]{mBean.getKey()});
        return line;
    }
    public List selectAllBeans(){
        List mList=new ArrayList();
        SQLiteDatabase mSqlite=myDbhelp.getReadableDatabase();
        Cursor mCursor=mSqlite.query(mDbName,null,null,null,null,null,null);
        while (mCursor.moveToNext()){
            RoamingBean bean=new RoamingBean();

bean.setKey(mCursor.getString(mCursor.getColumnIndex("key")));
            bean.setValue(mCursor.getString(mCursor.getColumnIndex("value")));
            mList.add(bean);

        }
        return mList;
    }
    public void deletAllData(){
        SQLiteDatabase mSqlite=myDbhelp.getReadableDatabase();
        mSqlite.delete(mDbName,null,null);
    }
}

3.使用

textview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MyDatabaseUtils databaseUtils=new MyDatabaseUtils(getApplicationContext());
               List mList= databaseUtils.selectAllBeans();
            StringBuffer sb=new StringBuffer();
                for(RoamingBean bean:mList){
                sb.append(bean.getKey()+"--"+bean.getValue()+";");

            }
                textview.setText(sb.toString());
                Log.e("allData",sb.toString());
            }
        });

4.加入contentprovide

public class MyContentProvide extends ContentProvider{
    private SQLiteDatabase db;
    private MyDatabaseUtils dbUtils;
    public static UriMatcher uriMatcher=new UriMatcher(UriMatcher.NO_MATCH);

    //uriMatcher.="content://com.example.shibo.mytest_contentprovide.contentprovide";
static {
    uriMatcher.addURI("content://com.example.shibo.mytest_contentprovide.contentprovide","roamingdata",1);
}
    @Override
    public boolean onCreate() {
        Log.e("开启开启","");
        dbUtils=new MyDatabaseUtils(getContext());
        db=dbUtils.myDbhelp.getReadableDatabase();
        return true;
    }

    @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) {
        if(uriMatcher.match(uri)==1){
            db.insert("roamingdata",null,values);
        }else {
            throw new IllegalArgumentException("不匹配！！");
        }
        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) {
        Log.e("机内到欧派打他","");
        int i=db.update("roamingdata",values,selection,selectionArgs);
        return i;
    }
}

5.再manifest配置

6.contentprovide使用

 textview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ContentResolver contentResolver=getContentResolver();
              ContentValues values=new ContentValues();
               values.put("key","a");
             values.put("value","赵日天");
               contentResolver.update(Uri.parse("content://com.example.shibo.mytest_contentprovide.contentprovide"),values,"key=?",new String[]{"a"});
            }
        });