Question

这是我的连接类，我真正想要的是如何在SharedPreference中获取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代码来设置数据

   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）添加一个应用程序类

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行添加到清单应用程序标签中

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

3）在ConnectionClass类中执行此操作

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类

1 个答案: