使用 sharedpreferences 将字符串 IP 地址设置为数据库连接 class

Question

这是我的连接class我真正想要的是如何获取 SharedPreference 中的数据并将其设置到我的 String IPadd 中。

 public class ConnectionClass  {



    String IPadd ="192.168.254.117";


    String classs = "com.mysql.jdbc.Driver";

    String url = "jdbc:mysql://"+IPadd+"/dblight";
    String un = "light";
    String password = "12345";


    @SuppressLint("NewApi")
    public Connection CONN() {


        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                .permitAll().build();
        StrictMode.setThreadPolicy(policy);
        Connection conn = null;
        String ConnURL = null;
        try {

            Class.forName(classs);

            conn = DriverManager.getConnection(url, un, password);


            conn = DriverManager.getConnection(ConnURL);
        } catch (SQLException se) {
            Log.e("ERRO", se.getMessage());
        } catch (ClassNotFoundException e) {
            Log.e("ERRO", e.getMessage());
        } catch (Exception e) {
            Log.e("ERRO", e.getMessage());
        }
        return conn;
    }

}

我的SharedPreference设置数据的代码

   try {
                         String strIP = ip.getText().toString();
                         SharedPreferences sharedPref = getSharedPreferences(Filename, Context.MODE_PRIVATE);
                        SharedPreferences.Editor editor = sharedPref.edit();
                         editor.putString("name", strIP);
                         editor.commit();
                         Toast.makeText(getBaseContext(), "IP Saved Successfully", Toast.LENGTH_LONG).show();
                            }
                        catch (Exception ex)
                            {

                            }

Answer 1

1)添加应用程序class

public class MyApplication extends Application {

private static final String TAG = MyApplication.class.getSimpleName();

private static MyApplication sInstance;

@Nullable
public static Context getAppContext() {
    return sInstance;
}

@Override
public void onCreate() {
    super.onCreate();
    Log.d(TAG, "onCreate() called");
    sInstance = this;
 }
}

2) 将 android:name 行添加到您的清单应用程序标签

<application
    android:name="your.package.name.MyApplication"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">

3) 在您的 ConnectionClass 中 class 执行此操作

IPadd = MyApplication.getAppContext().getSharedPreferences(Filename,Context.MODE_PRIVATE).getString("name","defaultValue");

使用 sharedpreferences 将字符串 IP 地址设置为数据库连接 class

Set string IP address using sharedpreferences into database connection class

android

sharedpreferences

android-sharedpreferences