SQLiteDatabase

在DDMS的File Explorer中的data\data\PACKAGE_NAME\databases中可以看到数据库的创建和删除

public class MainActivity extends Activity implements OnClickListener {
    public static final String DATABASE_NAME = "mdb";
    private SQLiteDatabase database;
    private Button bt1, bt2, bt3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt1 = (Button) findViewById(R.id.button1);
        bt2 = (Button) findViewById(R.id.button2);
        bt3 = (Button) findViewById(R.id.button3);
        bt1.setOnClickListener(this);
        bt2.setOnClickListener(this);
        bt3.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
        case R.id.button1:
            database = openOrCreateDatabase(DATABASE_NAME, MODE_PRIVATE, null);
            if (database != null) {
                Toast.makeText(getBaseContext(),
                        getString(R.string.create_success) + DATABASE_NAME,
                        Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(getBaseContext(),
                        getString(R.string.create_failure) + DATABASE_NAME,
                        Toast.LENGTH_LONG).show();
            }
            break;
        case R.id.button2:
            database.close();
            Toast.makeText(getBaseContext(),
                    getString(R.string.close_success) + DATABASE_NAME,
                    Toast.LENGTH_LONG).show();
            break;
        case R.id.button3:
            Boolean isDeleted = deleteDatabase(DATABASE_NAME);
            if (isDeleted) {
                Toast.makeText(getBaseContext(),
                        getString(R.string.delete_success) + DATABASE_NAME,
                        Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(getBaseContext(),
                        getString(R.string.delete_failure) + DATABASE_NAME,
                        Toast.LENGTH_LONG).show();
            }
            break;
        }

    }

}