Question

晚上好。我试图保存用户在SharedPreferences中在Spinner中做出的选择，当他点击OK，但我没有得到它，有人可以帮助我吗？然后我想要重新打开再次打开应用程序时所做的选择并将其放在textView中。

关注我的代码。

mShowDialog = (Button) findViewById(R.id.btnEscolhaCidade);

    mShowDialog.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            AlertDialog.Builder mBuilder = new AlertDialog.Builder(MainActivity.this);
            View mView = getLayoutInflater().inflate(R.layout.dialog_spinner, null);
            mBuilder.setTitle("Em qual Cidade Você está?");

            final Spinner mSpinner = (Spinner) mView.findViewById(R.id.spinner2);
            ArrayAdapter<String> adapter3 = new ArrayAdapter<String>(MainActivity.this,
                    android.R.layout.simple_spinner_item,
                    getResources().getStringArray(R.array.cidades));
            adapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            mSpinner.setAdapter(adapter3);

            mBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    if (!mSpinner.getSelectedItem().toString().equalsIgnoreCase("Escolha uma Cidade")) {
                        cidade_Escolhida.setText(mSpinner.getSelectedItem().toString());
                        SharedPreferences.Editor editor = preferences2.edit();
                        editor.putString(getString(R.string.cidade_escolhida_salvo), mSpinner.getSelectedItem().toString());
                        editor.apply();

                                Toast.makeText(MainActivity.this,
                                mSpinner.getSelectedItem().toString(),
                                Toast.LENGTH_LONG)
                                .show();
                        dialogInterface.dismiss();
                    }

                }
            });

            mBuilder.setNegativeButton("Cancelar", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    dialogInterface.dismiss();

                }
            });
            mBuilder.setView(mView);
            AlertDialog dialog = mBuilder.create();
            dialog.show();
        }
    });

Answer 1

检查一下，

public class PreferenceManager {
private Context context;
private SharedPreferences sharedPreferences;
private SharedPreferences.Editor editor;


public PreferenceManager(Context context) {
    this.context = context;
    sharedPreferences = context.getSharedPreferences("General", Context.MODE_PRIVATE);
    editor = sharedPreferences.edit();
    editor.apply();
}

public void saveString(String key, String value) {
    editor.putString(key, value);
    editor.commit();
}

public String getString(String key) {
    return sharedPreferences.getString(key, "NA");
}
}

保存字符串

PreferenceManager preferenceManager = new PreferenceManager(context);
preferenceManager.saveString("key","StringValue");

获取存储的字符串

 PreferenceManager preferenceManager = new PreferenceManager(context);
 String savedString = preferenceManager.getString("key");

带有SharedPreferences的微调器

1 个答案: