Question

我正在尝试创建一个允许用户在特定时间段内阻止应用的Android应用。所以我在一个片段中有一个已安装应用的列表视图，旁边有一个切换按钮。

我希望它在用户检查时保持检查状态，或在用户按下并退出应用程序后取消选中它。

enter image description here

我正在尝试使用setOnCheckedChangeListener和Shared Preferences实现此目的;然而;我在BaseAdapter类中保存按钮状态时遇到问题。

    holder.ck1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            if (holder.ck1.isChecked()) {
                //itemChecked[position] = true;
                b = true;
                holder.ck1.setChecked(b);
                Log.i("This is", " checked: " + position);
                SharedPreferences.Editor editor = context.getSharedPreferences("com.ibc.android.demo.appslist.app", Context.MODE_PRIVATE).edit();
                editor.putBoolean("checkBox1", b);
                editor.commit();

            } else {
                //itemChecked[position] = false;
                b= false;
                holder.ck1.setChecked(b);
                Log.i("This is", " not checked: " + position);
                SharedPreferences.Editor editor = context.getSharedPreferences("com.ibc.android.demo.appslist.app", Context.MODE_PRIVATE).edit();
                editor.putBoolean("checkBox1", b);
                editor.commit();

            }
        }

    });
    sharedPrefs = context.getSharedPreferences("PACKAGE_NAME", Context.MODE_PRIVATE);
    holder.ck1.setChecked(sharedPrefs.getBoolean("checkBox1",false));

    // I think that maybe instead of false I should put the boolean b I defined in the method but I am not sure how to get it .


    return convertView;

}

我如何修改此项以达到预期效果？

Answer 1

我认为每当活动创建它时，它会自动调用onCheckedChange，并且您的SharedPreferences会默认值覆盖。所以我认为你可以使用onStop来更新SharedPreferences。

Answer 2

holder.ck1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) 
        { 
                SharedPreferences.Editor editor = context.getSharedPreferences("PACKAGE_NAME", Context.MODE_PRIVATE).edit();
                editor.putBoolean(pakagename, b);
                editor.commit();
        }

});

sharedPrefs = context.getSharedPreferences("PACKAGE_NAME", Context.MODE_PRIVATE);
holder.ck1.setChecked(sharedPrefs.getBoolean(pakagename,false));
return convertView;

}

pakagename保存该特定listitem的包名称。否则，如果您的目标是api级别11以上，则可以使用sharedpreferences中的集合来存储所有已检查的软件包名称。这是简单的方法。否则，您可以将已检查的应用程序列表保存在数据库中。

Answer 3

我已经达到了要求的功能。检查我的代码：

final SharedPreferences sharedPreferences = getSharedPreferences("conditionCheck", MODE_PRIVATE); 
switchCompat.setChecked(sharedPreferences.getBoolean("switchCondition",false));        
switchCompat.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        final SharedPreferences sharedPreferences = getSharedPreferences("conditionCheck", MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        if (switchCompat.isChecked()) {
            Toast.makeText(getApplicationContext(), "Checked Condition True", Toast.LENGTH_LONG).show();
            editor.putBoolean("switchCondition",switchCompat.isChecked());
            editor.commit();    
        } else {
            Toast.makeText(getApplicationContext(), "Checked Condition False", Toast.LENGTH_LONG).show();
            editor.putBoolean("switchCondition",switchCompat.isChecked());
            editor.commit();
        }
    }
});

按下后退按钮或使用SharedPreferences和onCheckChangeListener退出应用程序时保存选中的按钮状态

3 个答案: