SQLiteOpenHelper+ContentProvider的使用
效果图:
PetDbHelper
package com.example.admin.pets; import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;import com.example.admin.pets.PetContract.PetEntry; public class PetDbHelper extends SQLiteOpenHelper { private static final String DATABASE_NAME="shelter.db"; private static final int DATABASE_VERSION=1; public PetDbHelper(Context context){ super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { String SQL_CREATE_PETS_TABLE="CREATE TABLE "+PetEntry.TABLE_NAME+"("+ PetEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + PetEntry.COLUMN__PET_NAME + " TEXT NOT NULL, " + PetEntry.COLUMN__PET_BREED + " TEXT, " + PetEntry.COLUMN__PET_GENDER + " INTEGER NOT NULL, " + PetEntry.COLUMN__PET_WEIGHT + " INTEGER NOT NULL DEFAULT 0);"; db.execSQL(SQL_CREATE_PETS_TABLE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { }} PetProvider
package com.example.admin.pets; import android.content.ContentProvider;import android.content.ContentUris;import android.content.ContentValues;import android.content.UriMatcher;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.net.Uri;import android.util.Log;import com.example.admin.pets.PetContract.PetEntry; public class PetProvider extends ContentProvider { public static final String LOG_TAG = PetProvider.class.getSimpleName(); private PetDbHelper petDbHelper; private static final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH); private static final int PETS = 100; private static final int PETS_ID = 101; static { matcher.addURI(PetContract.CONTENT_AUTHORITY, PetContract.PATH_PETS, PETS); matcher.addURI(PetContract.CONTENT_AUTHORITY, PetContract.PATH_PETS + "/#", PETS_ID); } @Override public boolean onCreate() { petDbHelper=new PetDbHelper(getContext()); return true; } @Override public Cursor query( Uri uri, String[] projection, String selection, String[] selectionArgs,String sortOrder) { SQLiteDatabase sqLiteDatabase=petDbHelper.getReadableDatabase(); Cursor cursor; final int match=matcher.match(uri); switch (match){ case PETS: cursor = sqLiteDatabase.query(PetContract.PetEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, sortOrder); break; case PETS_ID: selection = PetContract.PetEntry._ID + "=?"; selectionArgs = new String[]{String.valueOf(ContentUris.parseId(uri))}; cursor = sqLiteDatabase.query(PetContract.PetEntry.TABLE_NAME, projection, selection, selectionArgs, null, null, sortOrder); break; default: throw new IllegalArgumentException("Cannot query unknown URL" + uri); } cursor.setNotificationUri(getContext().getContentResolver(),uri); return cursor; } @Override public Uri insert( Uri uri, ContentValues values) { final int match = matcher.match(uri); switch (match) { case PETS: return insertPet(uri, values); default: throw new IllegalArgumentException("Insertion is not supported for " + uri); } } private Uri insertPet(Uri uri, ContentValues values) { String name = values.getAsString(PetEntry.COLUMN__PET_NAME); if (name == null) { throw new IllegalArgumentException("Pet requires a name"); } Integer gender = values.getAsInteger(PetEntry.COLUMN__PET_GENDER); if (gender == null || !PetEntry.isValidGender(gender)) { throw new IllegalArgumentException("Pet requires valid gender"); } Integer weight = values.getAsInteger(PetEntry.COLUMN__PET_WEIGHT); if (weight != null && weight < 0) { throw new IllegalArgumentException("Pet requires valid weight"); } SQLiteDatabase database = petDbHelper.getWritableDatabase(); long id = database.insert(PetEntry.TABLE_NAME, null, values); if (id == -1) { Log.e(LOG_TAG, "Failed to insert row for " + uri); return null; } getContext().getContentResolver().notifyChange(uri,null); return ContentUris.withAppendedId(uri, id); } @Override public int delete( Uri uri, String selection,String[] selectionArgs) { int rowsDeleted; SQLiteDatabase database = petDbHelper.getWritableDatabase(); final int match = matcher.match(uri); switch (match) { case PETS: rowsDeleted = database.delete(PetEntry.TABLE_NAME, selection, selectionArgs); break; case PETS_ID: selection = PetEntry._ID + "=?"; selectionArgs = new String[]{String.valueOf(ContentUris.parseId(uri))}; rowsDeleted = database.delete(PetEntry.TABLE_NAME, selection, selectionArgs); break; default: throw new IllegalArgumentException("Deletion is not supported for " + uri); } if (rowsDeleted != 0) { getContext().getContentResolver().notifyChange(uri, null); } return rowsDeleted; } @Override public int update( Uri uri, ContentValues values, String selection, String[] selectionArgs) { final int match = matcher.match(uri); switch (match) { case PETS: return updatePet(uri, values, selection, selectionArgs); case PETS_ID: selection = PetEntry._ID + "=?"; selectionArgs = new String[]{String.valueOf(ContentUris.parseId(uri))}; return updatePet(uri, values, selection, selectionArgs); default: throw new IllegalArgumentException("Update is not supported for " + uri); } } private int updatePet(Uri uri, ContentValues values, String selection, String[] selectionArgs) { if (values.containsKey(PetEntry.COLUMN__PET_NAME)) { String name = values.getAsString(PetEntry.COLUMN__PET_NAME); if (name == null) { throw new IllegalArgumentException("Pet requires a name"); } } if (values.containsKey(PetEntry.COLUMN__PET_GENDER)) { Integer gender = values.getAsInteger(PetEntry.COLUMN__PET_GENDER); if (gender == null || !PetEntry.isValidGender(gender)) { throw new IllegalArgumentException("Pet requires valid gender"); } } if (values.containsKey(PetEntry.COLUMN__PET_WEIGHT)) { Integer weight = values.getAsInteger(PetEntry.COLUMN__PET_WEIGHT); if (weight != null && weight < 0) { throw new IllegalArgumentException("Pet requires valid weight"); } } if (values.size() == 0) { return 0; } SQLiteDatabase database = petDbHelper.getWritableDatabase(); int rowsUpdated = database.update(PetEntry.TABLE_NAME, values, selection, selectionArgs); if (rowsUpdated != 0) { getContext().getContentResolver().notifyChange(uri, null); } return rowsUpdated; } @Override public String getType( Uri uri) { final int match = matcher.match(uri); switch (match) { case PETS: return PetEntry.CONTENT_LIST_TYPE; case PETS_ID: return PetEntry.CONTENT_ITEM_TYPE; default: throw new IllegalStateException("Unknown URI " + uri + " with match " + match); } } }
github项目源码: https://github.com/NeoWu55/Android-Pets
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