Android数据库--Sqlcipher的使用（一）

1、下载官方支持包：https://s3.amazonaws.com/sqlcipher/3.2.0/sqlcipher-for-android-community-v3.2.0.zip

     Github地址：https://github.com/sqlcipher/android-database-sqlcipher

2、本博客使用Android Studio开发，Eclipse怎样使用Sqlcipher大家可以到网上搜索。

3、需要导入以下包及文件。如何导入Jar包可以参考我的博客http://www.cnblogs.com/begin1949/p/4966542.html。

4、我们重写一下SqliteOpenHelper类。这里注意一下引用的类来自于net.sqlcipher.database而不是谷歌官方的sqlite包。

import android.content.Context;

import net.sqlcipher.database.SQLiteDatabase;
import net.sqlcipher.database.SQLiteOpenHelper;

public class MyDatabaseHelper extends SQLiteOpenHelper {
    public static final String CREATE_TABLE = "create table Book(name text,pages integer)";

    public MyDatabaseHelper(Context context, String name, SQLiteDatabase.CursorFactory
            factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) {
        sqLiteDatabase.execSQL(CREATE_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
    }
}

5、接下来即可使用了。

import android.content.ContentValues;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.sqlcipher.R;

import net.sqlcipher.Cursor;
import net.sqlcipher.database.SQLiteDatabase;

public class Use1Activity extends FragmentActivity implements View.OnClickListener {

    private SQLiteDatabase db;
    private MyDatabaseHelper dbHelper;

    private Button mBtnAdd;
    private Button mBtnQuery;
    private TextView mTvShow;

    private String result;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_use1);

        initView();
    }

    private void initView() {
        SQLiteDatabase.loadLibs(this);
        dbHelper = new MyDatabaseHelper(this, "demo.db", null, 1);
        db = dbHelper.getWritableDatabase("secret_key");

        mBtnAdd = (Button) findViewById(R.id.add_data);
        mBtnQuery = (Button) findViewById(R.id.query_data);
        mTvShow = (TextView) findViewById(R.id.tv_show);

        mBtnAdd.setOnClickListener(this);
        mBtnQuery.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if (v == mBtnAdd) {
            ContentValues values = new ContentValues();
            values.put("name", "密码");
            values.put("pages", 566);
            db.insert("Book", null, values);
        } else if (v == mBtnQuery) {
            Cursor cursor = db.query("Book", null, null, null, null, null, null);
            if (cursor != null) {
                while (cursor.moveToNext()) {
                    String name = cursor.getString(cursor.getColumnIndex("name"));
                    int pages = cursor.getInt(cursor.getColumnIndex("pages"));
                    result += "book name is " + name + "\n";
                    result += "book pages is " + pages + "\n";
                }
            }
            cursor.close();

            mTvShow.setText(result);
            result = "";
        }
    }
}

6、参考博文：https://discuss.zetetic.net/t/android-studio-integration/65

                   http://blog.csdn.net/sziicool/article/details/18728153