Question

我刚刚接触到android studio，我遇到了这个问题。我有3个不同的标签与不同的片段，我有复选框。我使用comomunicator为浮动片段设置值。但每次我更改选项卡并选择其他选项卡中的复选框。第一个选项卡的值将不再计数，它将开始为零，因此我计划在该片段中创建一个全局变量而不是局部变量，因为在java中我使用全局变量来提高效率。所以我的问题是如何创建一个全局变量并将所有值存储到它。

继承人我的Tab1：

public class Tab1 extends android.support.v7.app.AppCompatDialogFragment implements View.OnClickListener {
    CheckBox mc1,mc2,mc3,mc4,mc5,mc6,mc7,mc8,mc9,mc10,mc11,mc12;
    communicator comm;
    int total;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.tab1, container, false);

    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        comm=(communicator)getActivity();
        mc1=(CheckBox)getActivity().findViewById(R.id.mc1);
        mc1.setOnClickListener(this);
        mc2=(CheckBox)getActivity().findViewById(R.id.mc2);
        mc2.setOnClickListener(this);
        mc3=(CheckBox)getActivity().findViewById(R.id.mc3);
        mc3.setOnClickListener(this);
        mc4=(CheckBox)getActivity().findViewById(R.id.mc4);
        mc4.setOnClickListener(this);
        mc5=(CheckBox)getActivity().findViewById(R.id.mc5);
        mc5.setOnClickListener(this);
        mc6=(CheckBox)getActivity().findViewById(R.id.mc6);
        mc6.setOnClickListener(this);
        mc7=(CheckBox)getActivity().findViewById(R.id.mc7);
        mc7.setOnClickListener(this);
        mc8=(CheckBox)getActivity().findViewById(R.id.mc8);
        mc8.setOnClickListener(this);
        mc9=(CheckBox)getActivity().findViewById(R.id.mc9);
        mc9.setOnClickListener(this);
        mc10=(CheckBox)getActivity().findViewById(R.id.mc10);
        mc10.setOnClickListener(this);
        mc11=(CheckBox)getActivity().findViewById(R.id.mc11);
        mc11.setOnClickListener(this);
        mc12=(CheckBox)getActivity().findViewById(R.id.mc12);
        mc12.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        boolean checked = ((CheckBox) v).isChecked();
        switch (v.getId()){
            case R.id.mc1:
                if(checked){
                    total=total+400;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-400;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc2:
                if(checked){
                    total=total+250;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-250;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc3:
                if(checked){
                    total=total+350;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-350;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc4:
                if(checked){
                    total=total+400;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-400;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc5:
                if(checked){
                    total=total+250;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-250;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc6:
                if(checked){
                    total=total+250;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-250;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc7:
                if(checked){
                    total=total+250;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-250;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc8:
                if(checked){
                    total=total+200;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-200;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc9:
                if(checked){
                    total=total+150;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-150;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc10:
                if(checked){
                    total=total+150;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-150;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc11:
                if(checked){
                    total=total+450;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-450;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
            case R.id.mc12:
                if(checked){
                    total=total+550;
                    comm.respond("Total:\n"+total+" Php.");
                }
                else{
                    total=total-550;
                    comm.respond("Total:\n"+total+" Php.");
                }
                break;
        }
    }
}

继承人我的Tab2：

public class Tab2 extends android.support.v7.app.AppCompatDialogFragment implements View.OnClickListener{
    CheckBox aoc1,aoc2,aoc3,aoc4;
    communicator comm;
    int total;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.tab2,container,false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        comm=(communicator)getActivity();
        aoc1=(CheckBox)getActivity().findViewById(R.id.aoc1);
        aoc1.setOnClickListener(this);
        aoc2=(CheckBox)getActivity().findViewById(R.id.aoc2);
        aoc2.setOnClickListener(this);
        aoc3=(CheckBox)getActivity().findViewById(R.id.aoc3);
        aoc3.setOnClickListener(this);
        aoc4=(CheckBox)getActivity().findViewById(R.id.aoc4);
        aoc4.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        boolean checked = ((CheckBox) v).isChecked();
        switch (v.getId()) {
            case R.id.aoc1:
                if (checked) {
                    total = total + 50;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 50;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.aoc2:
                if (checked) {
                    total = total + 100;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 100;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.aoc3:
                if (checked) {
                    total = total + 100;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 100;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.aoc4:
                if (checked) {
                    total = total + 150;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 150;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
        }
    }
}

继承人我的Tab3：

public class Tab3 extends android.support.v7.app.AppCompatDialogFragment implements  View.OnClickListener{
    CheckBox fc1,fc2,fc3,fc4,fc5,fc6,fc7,fc8;
    int total=0;
    communicator comm;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.tab3,container,false);
    }
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        comm=(communicator)getActivity();
        fc1=(CheckBox)getActivity().findViewById(R.id.fc1);
        fc1.setOnClickListener(this);
        fc2=(CheckBox)getActivity().findViewById(R.id.fc2);
        fc2.setOnClickListener(this);
        fc3=(CheckBox)getActivity().findViewById(R.id.fc3);
        fc3.setOnClickListener(this);
        fc4=(CheckBox)getActivity().findViewById(R.id.fc4);
        fc4.setOnClickListener(this);
        fc5=(CheckBox)getActivity().findViewById(R.id.fc5);
        fc5.setOnClickListener(this);
        fc6=(CheckBox)getActivity().findViewById(R.id.fc6);
        fc6.setOnClickListener(this);
        fc7=(CheckBox)getActivity().findViewById(R.id.fc7);
        fc7.setOnClickListener(this);
        fc8=(CheckBox)getActivity().findViewById(R.id.fc8);
        fc8.setOnClickListener(this);

    }
    @Override
    public void onClick(View v) {
        boolean checked = ((CheckBox) v).isChecked();
        switch (v.getId()) {
            case R.id.fc1:
                if (checked) {
                    total = total + 70;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 70;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.fc2:
                if (checked) {
                    total = total + 80;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 80;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.fc3:
                if (checked) {
                    total = total + 300;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 300;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.fc4:
                if (checked) {
                    total = total + 300;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 300;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.fc5:
                if (checked) {
                    total = total + 200;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 200;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.fc6:
                if (checked) {
                    total = total + 260;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 260;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.fc7:
                if (checked) {
                    total = total + 180;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 180;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
            case R.id.fc8:
                if (checked) {
                    total = total + 180;
                    comm.respond("Total:\n" + total + " Php.");
                } else {
                    total = total - 180;
                    comm.respond("Total:\n" + total + " Php.");
                }
                break;
        }
    }
}

提前致谢！ PS。我使用communicator在浮动片段中抛出值。

Answer 1

使用应用程序类。创建一个扩展Application的类，在类中声明所有变量并为变量创建getter和setter。您现在可以使用该类来存储和检索任何片段中的数据。

This链接可以帮助您入门。

如何创建一个全局变量并将值抛入其中

1 个答案: