如何将复选框数据传递给另一个 activity

Question

如何将复选框数据从一个 activity 传递到另一个？如果复选框是checked/selected，它将以String形式从第一个activity到第二个activity传递数据。第二个 activity 将获取字符串并在 _Job_fx 上设置文本，但为什么在未选中复选框时会出现其他复选框字符串？我的数据绕过我的条件并在 _Job_fx 上设置文本。如何解决这个问题？

第一activity:

sharedPreferences = getSharedPreferences("Add_job_fx", MODE_PRIVATE);

_electric_item01 = (CheckBox) findViewById(R.id.electric_item01);
checkbox(_electric_item01);
_electric_item02 = (CheckBox) findViewById(R.id.electric_item02);
checkbox(_electric_item02);
_electric_item03 = (CheckBox) findViewById(R.id.electric_item03);
checkbox(_electric_item03);
_electric_item04 = (CheckBox) findViewById(R.id.electric_item04);
checkbox(_electric_item04);

    private void checkbox(final CheckBox check) {

        check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (check.isSelected()) {
                    //edit shared preference (put data)
                    SharedPreferences.Editor editor = sharedPreferences.edit();
                    //put data in shared preference
                    editor.putString(check.getText().toString(), check.getText().toString());
                    //apply changes to shared preference
                    editor.apply();
                }
                else {
                    SharedPreferences.Editor editor = sharedPreferences.edit();
                    editor.remove(check.getText().toString());
                    editor.clear();
                    editor.apply();
                }
            }
        });
    }

秒activity:

//shared preferences (Name, Mode)
sharedPreferences = getSharedPreferences("Add_job_fx", MODE_PRIVATE);
//get data from shared preference
s_electric_item01 = sharedPreferences.getString("Change lightbulb", "");
s_electric_item02 = sharedPreferences.getString("Change starter", "");
s_electric_item03 = sharedPreferences.getString("Change light set", "");
s_electric_item04 = sharedPreferences.getString("Change fan + regulator", "");
//pass data to container for view 
_Job_fx.setText("Job: " + s_electric_item01 +"\n"+ s_electric_item02 + "\n"+ s_electric_item03);

Answer 1

我想你需要先检查复选框是否被选中，如果被选中 returns true ，并相应地获取您的复选框值并将其用于共享首选项

 private void checkbox(final CheckBox check) {

          SharedPreferences sharedPreferences = 
        getSharedPreferences("Add_job_fx", MODE_PRIVATE); //add this line here 
        check.setOnCheckedChangeListener(new 
             CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean 
                isChecked) {
                if (isChecked) { // here check if the checkbox is checked 
                    // or not if yes then retreive the value and push it into 
                    // Sharedpreferences

                    SharedPreferences.Editor editor = sharedPreferences.edit();
                    editor.putString("put a key here ",
                            check.getText().toString());
                    editor.apply();
                }
                else {
                    SharedPreferences.Editor editor = sharedPreferences.edit();
                    editor.remove("put your key to remove from SP , the same key 
                     as 
                            above");
                            editor.clear();
                    editor.apply();
                }
            }
            
        });

Answer 2

我已经解决了，关于sharedpreferences的事情是即使应用程序关闭它也会自动保存数据。所以默认情况下，每次我在第一次尝试后转到第二个 activity 时，它会将前一个字符串保存到 _Job_fx.setText。解决方案只是通过删除以前的字符串将默认值设置为空。

sharedPreferences = getSharedPreferences("Add_job_fx", MODE_PRIVATE);

_electric_item01 = (CheckBox) findViewById(R.id.electric_item01);
checkbox(_electric_item01);
_electric_item02 = (CheckBox) findViewById(R.id.electric_item02);
checkbox(_electric_item02);
_electric_item03 = (CheckBox) findViewById(R.id.electric_item03);
checkbox(_electric_item03);
_electric_item04 = (CheckBox) findViewById(R.id.electric_item04);
checkbox(_electric_item04);

private void checkbox(final CheckBox check) {
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.remove(check.getText().toString());
        editor.apply();
        check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (check.isChecked()) {
                    SharedPreferences.Editor editor = sharedPreferences.edit();
                    editor.putString(check.getText().toString(), check.getText().toString());
                    editor.apply();
                } else if (!check.isChecked()) {
                    SharedPreferences.Editor editor = sharedPreferences.edit();
                    editor.remove(check.getText().toString());
                    editor.apply();
                }
            }
        });
    }

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