Question

美好的一天，

我有一个问题，我会保存whith SharedPreference简单的int值变量，但我遇到了困难。我有一个Flag-Variable“signum”，根据所选的ImageButton更改值，我会保存此Flag-Value。一个Activity使用两次方法SharedPreferences是可能的吗？对我来说，如果Flag-Value是String或int变量并不重要，我需要一个简单的方法。我想（但我甚至不确定）我在代码行中的错误存储中我在代码行中：salvum2.putInt（“semper2”，1或2）;插入正确的方式为所有人提供帮助并为您提供帮助！

public class MainActivity extends Activity {
private static final String MUTATIO = "semper";
private static final String MUTATIO2 = "semper2";
private ImageButton button;
int signum ;  //this is the variable that I want to save

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

    choicheimagebutton();
    operation();
}


private void choicheimagebutton() {
    final SharedPreferences optio =         
            getSharedPreferences(MUTATIO, Context.MODE_PRIVATE);

    final SharedPreferences optio2 = 
            getSharedPreferences(MUTATIO2, Context.MODE_PRIVATE);

    button = (ImageButton) findViewById(R.id.imageButton1);
    button.setImageResource(optio.getInt(MUTATIO, R.drawable.default)); 

    button.setOnLongClickListener(new OnLongClickListener(){

        @Override
        public boolean onLongClick(View v) {




final Dialog dialog = new Dialog(MainActivity.this);
            dialog.setContentView(R.layout.dialog);
            dialog.setTitle("Titolo menù scelta");



            TextView text = (TextView) dialog.findViewById(R.id.text);
            text.setText("Scegli l'icona");
            ImageView image = (ImageView) dialog.findViewById(R.id.image);
            image.setImageResource(R.drawable.ic_launcher);

            dialog.show();

            Button dialogButtonLuce = (Button) dialog.findViewById(R.id.dialogButtonLuceID);

            dialogButtonLuce.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {


                    button.setImageResource(R.drawable.lux);
                    signum = 1 ;
    SharedPreferences.Editor salvum = optio.edit();
    salvum.putInt("semper", R.drawable.lux);

         //Now I would save the flag-int-variable

    salvum.putInt("semper", 1);
    salvum.commit();
                    dialog.dismiss();

                }
            });


  Button dialogButtonGas = (Button) dialog.findViewById(R.id.dialogButtonGasID);

    dialogButtonGas.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {

                button.setImageResource(R.drawable.gas);
                signum = 2;
                SharedPreferences.Editor salvum = optio.edit();
                salvum.putInt("semper", R.drawable.gas);
                salvum.commit();



                salvum.putInt("semper", 2);
                salvum.commit();
 dialog.dismiss();}});

 Button RESET = (Button) dialog.findViewById(R.id.dialogRipristinaID);
 RESET.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
    optio.edit().clear().commit();

    dialog.dismiss();
    }});return true;}});}

private void operation() {
    button.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {

            if (signum==1) {
                Toast.makeText(MainActivity.this, "I have a LUX", Toast.LENGTH_LONG)
                .show();
                }
            if (signum==2) {
                Toast.makeText(MainActivity.this, "I have GAS GAS", Toast.LENGTH_LONG)
                .show();
            }
            else  {
                Toast.makeText(MainActivity.this, "VACUUM", Toast.LENGTH_LONG)
                .show();
            }}});}}

Answer 1

SharedPreferences prefs = getSharedPreferences(MUTATIO, Context.MODE_PRIVATE);
Editor editor = prefs.edit();
editor.putInt("semper", R.drawable.lux );
editor.putInt("semper2", 1);
editor.commit();

Answer 2

如果semper2是 STRING ，那么这是错误的（所有事件）：salvum2.putString("semper2", 2);
它应该是：salvum2.putString("semper2", "2");

如果semper2是 INT ，那么这是错误的（所有事件）：salvum2.putString("semper2", 2);
它应该是：salvum2.putInt("semper2", 2);

另请注意，您不需要为要保存的每个首选项键创建一个编辑器：一个就够了。
在您节省的所有费用结束时，提交一次操作。

Answer 3

保存使用此

private SharedPreferences prefs;
 prefs = PreferenceManager.getDefaultSharedPreferences(cntx);
 prefs.edit().putInt("userId", userId).commit();
prefsCommit();

并且可以使用此

int userId = prefs.getInt("userId", 0);

如何使用SharedPreferences保存int变量？

3 个答案: