Question

我正在制作桶列表应用程序，它为每个任务创建一个切换按钮，所以如果按下按钮它会从状态“false”变为“true”但是我怎么能保存它们的状态所以它们不会重新启动应用后更改？它只适用于单个按钮，但是如何使它适用于连接到列表视图的每个切换按钮？

public class MainActivity extends AppCompatActivity {
private TaskDbHelper mHelper;
private ListView mTaskListView;
private ArrayAdapter<String> mAdapter;
SharedPreferences sp;
@Override

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mHelper = new TaskDbHelper(this);
    updateUI();
    LayoutInflater myinflater = getLayoutInflater();
    View myview = myinflater.inflate(R.layout.item_todo, (ViewGroup) findViewById(R.id.lld),false);
    ToggleButton togglebut = (ToggleButton) myview.findViewById(R.id.toggleButton);
    sp = getSharedPreferences("sp",MainActivity.MODE_PRIVATE);

                                      if (sp.getString("sp","").equals("0")){
                                          togglebut.setChecked(true);
                                      } else if (sp.getString("sp","").equals("1")){
                                          togglebut.setChecked(false);
                                      }

                                      if (togglebut.isChecked()){
                                          sp.edit().putString("sp","0").apply();
                                      } else {sp.edit().putString("sp","0").apply();
                                      }


    togglebut.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            sp = getSharedPreferences("sp",MainActivity.MODE_PRIVATE);
            if (isChecked){
                sp.edit().putString("sp","0").apply();
            } else {
                sp.edit().putString("sp","1").apply();
            }
                                          }
                                      });
    }

Answer 1

您可以创建一个SharedPreference来保持按钮的状态。

这高于OnCreate：

SharedPreference sp;

这是OnCreate：

    sp = getSharedPreferences("sp",Activity.MODE_PRIVATE);
    String newsp = noise.getString("sp","");
    int spnum;
    try{
        spnum = Integer.parseInt(newsp);
    }catch (NumberFormatException e) {
        spnum = 0;
    }
    sp.edit().putString("sp",Integer.toString(spnum)).apply();

    ToggleButton togglebut = (ToggleButton) findViewById(R.id.togglebut);


        if (sp.getString("sp","").equals("0")){
            togglebut.setChecked(true);
        } else if (sp.getString("sp","").equals("1")){
            togglebut.setChecked(false);
           }

        if (togglebut.isChecked()){
            sp.edit().putString("sp","0").apply();
        } else {sp.edit().putString("sp","0").apply();
           }


        togglebut.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                    sp = getSharedPreferences("sp",Activity.MODE_PRIVATE);
                    if (isChecked){
                        sp.edit().putString("sp","0").apply();
                    } else {
                        sp.edit().putString("sp","1").apply();
                    }

                }
            });

重启应用后如何保存无限制切换按钮状态？

1 个答案: