Create dbContentProvider

Author: E1zo

dbContentProvider

@@ -0,0 +1,75 @@
+package com.example.contextprovider;
+
+import android.content.ContentProvider;
+import android.content.ContentValues;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.net.Uri;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public class dbContentProvider extends ContentProvider {
+
+    public static final int TABLE1_DIR = 0; //访问表1的所有数据
+      public static final int TABLE1_ITEM = 1; //访问表1的单条数据
+      public static final int TABLE2_DIR = 2;
+      public static final int TABLE2_ITEM = 3;
+
+    static {
+        UriMatcher 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);
+             }
+
+
+    private static UriMatcher uriMatcher;
+    public boolean onCreate() {
+        return false;
+    }
+
+    @Nullable
+    @Override
+    public Cursor query(@NonNull Uri uri, @Nullable String[] projection, @Nullable String selection, @Nullable String[] selectionArgs, @Nullable String sortOrder) {
+        switch(uriMatcher.match(uri)){
+        case TABLE1_DIR:
+            break;
+            case TABLE1_ITEM:
+                break;
+                    case TABLE2_DIR:
+
+                         break;
+                   case TABLE2_ITEM:
+                         //查询table2表中的单条数据
+                         break;
+                     default:
+                         break;
+               }
+        return null;
+    }
+
+    @Nullable
+    @Override
+    public String getType(@NonNull Uri uri) {
+        return null;
+    }
+
+    @Nullable
+    @Override
+    public Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {
+        return null;
+    }
+
+    @Override
+    public int delete(@NonNull Uri uri, @Nullable String selection, @Nullable String[] selectionArgs) {
+        return 0;
+    }
+
+    @Override
+    public int update(@NonNull Uri uri, @Nullable ContentValues values, @Nullable String selection, @Nullable String[] selectionArgs) {
+        return 0;
+    }
+}