ContentProvider使用

 package activity.cyq.contentprovidertenderer;

 import android.content.ContentProvider;

 import android.content.ContentValues;

 import android.content.Context;

 import android.database.Cursor;

 import android.database.sqlite.SQLiteDatabase;

 import android.net.Uri;

 public class MyContentProvider extends ContentProvider {

     public static final Uri URI=Uri.parse("content://cyq.activity.MyContentProvider");

     private SQLiteDatabase database;

     @Override

     public boolean onCreate() {

         database = getContext().openOrCreateDatabase("ContentProvider", Context.MODE_PRIVATE, null);

         database.execSQL("Create Table contacts( _id INTEGER PRIMARY KEY AUTOINCREMENT, username TEXT DEFAULT NONE , cellPhotoNumber TEXT DEFAULT NONE) ");

         return false;

     }

     @Override

     public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {

         Cursor cursor = database.query("contacts", null, null, null, null, null, null);

         return cursor;

     }

     @Override

     public String getType(Uri uri) {

         return null;

     }

     @Override

     public Uri insert(Uri uri, ContentValues values) {

         database.insert("contacts", "_id", values);

         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;

     }

 }

package activity.cyq.contentprovidertenderer;

import android.content.ContentValues;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private EditText usernameEdit;

    private EditText cellPhotoNumberEdit;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        usernameEdit = (EditText) findViewById(R.id.username);

        cellPhotoNumberEdit = (EditText) findViewById(R.id.cellPhotoNumber);

        findViewById(R.id.add).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                ContentValues values = new ContentValues();

                values.put("username", usernameEdit.getText().toString());

                values.put("cellPhotoNumber", cellPhotoNumberEdit.getText().toString());

                getContentResolver().insert(MyContentProvider.URI, values);

                Toast.makeText(MainActivity.this, "数据库创建成功", Toast.LENGTH_SHORT).show();

            }

        });

    }

}