如何在单选按钮 android 之间切换

Question

我有三个单选按钮..现在，当我想在单选按钮之间切换时，我正在使用警报对话框..现在单击 YES，另一个单选按钮是选中但在 NO 上它无法转到上一个单选按钮..

这是我的代码：

RadioGroup radioGroup;
RadioButton pre, during, post;
String lastChecked = "pre";   //This is the Flag which i m using 

radioGroup.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            lastCheckedid = radioGroup.getCheckedRadioButtonId();
        }
    });
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            lastCheckedid = radioGroup.getCheckedRadioButtonId();
            if (pre.isChecked()) {
                lastChecked = "pre";
                getlastchecked();
            } else if (during.isChecked()) {
                lastChecked = "during";
                getlastchecked();
            } else if (post.isChecked()) {
                lastChecked = "post";
                getlastchecked();
            }
        }
    });
private void getlastchecked() {
        AlertDialog.Builder alertDialog2 = new AlertDialog.Builder(MainActivity.this);
        alertDialog2.setTitle("Confirm Delete...");
        alertDialog2.setMessage("Are you sure you want delete this post ?");
        alertDialog2.setIcon(R.drawable.delete);
        alertDialog2.setPositiveButton("YES", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                imageView1.setImageDrawable(null);
                textview_imagename1.setText("");
                imageView2.setImageDrawable(null);
                textview_imagename2.setText("");
                imageView3.setImageDrawable(null);
                textview_imagename3.setText("");
            }
        });
        alertDialog2.setNegativeButton("NO", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                switch (lastCheckedid) {
                    case R.id.pre:
if (lastChecked.equals("during")){
during.setChecked(true);}
else if (lastCheck.equals("post")){
post.setChecked(true);}
                        break;
                    case R.id.during:
if (lastChecked.equals("pre")){
pre.setChecked(true);}
else if (lastCheck.equals("post")){
post.setChecked(true);}
                        break;
                    case R.id.post:
if (lastChecked.equals("during")){
during.setChecked(true);}
else if (lastCheck.equals("pre")){
pre.setChecked(true);}
                        break;
                }
    }
        });
        alertDialog2.show();
    }

NO 的条件不工作...请帮助

Answer 1

试试这个：

RadioGroup registerGender = (RadioGroup)findViewById(R.id.regsiter_gender);
int selectedId = registerGender.getCheckedRadioButtonId();
// find the radiobutton by returned id
radioButtonGender = (RadioButton) findViewById(selectedId);
radioButtonGender.getText().toString().trim()

Answer 2

只需从 OnCheckedCHangeListener 中删除这一行

lastCheckedid = radioGroup.getCheckedRadioButtonId();

这一行会将新检查的值保存到 lastCheckedId 中，然后创建 AlertDialog。现在，在 switch 中，不会发生任何事情，因为 lastCheckedId 具有当前选中的 Id。只需删除该行并重试

Answer 3

您的问题很难获取选中按钮的先前值并返回检查到该状态。首先，您的编码具有 lastCheckedid，这根据使用名称是不正确的。因此，我已将其更改为 curCheckedid 并尝试在演示中实施您的问题的解决方案。我希望这会解决你的问题。试试下面的代码：-

在定义变量中

RadioGroup radioGroup;
RadioButton pre, during, post;
String lastChecked = "pre";   //This is the Flag which i m using
int curCheckedid;
boolean isClickSet = true;

之后是初始化侦听器：-

    lastChecked = "pre";
    curCheckedid = pre.getId();
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            curCheckedid = radioGroup.getCheckedRadioButtonId();
            if (pre.isChecked()) {
                if(lastChecked != "pre" && isClickSet)
                    getlastchecked();
                else {
                    isClickSet = true;
                    lastChecked = "pre";
                }
            } else if (during.isChecked()&& isClickSet) {
                if(lastChecked != "during")
                    getlastchecked();
                else {
                    isClickSet = true;
                    lastChecked = "during";
                }
            } else if (post.isChecked()&& isClickSet) {
                if(lastChecked != "post")
                    getlastchecked();
                else {
                    isClickSet = true;
                    lastChecked = "post";
                }
            }
        }
    });

和单独的 getlastchecked() 方法：-

private void getlastchecked() {
    AlertDialog.Builder alertDialog2 = new AlertDialog.Builder(MainActivity.this);
    alertDialog2.setTitle("Confirm Delete...");
    alertDialog2.setMessage("Are you sure you want delete this post ?");
    alertDialog2.setIcon(R.drawable.delete);
    alertDialog2.setPositiveButton("YES", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            imageView1.setImageDrawable(null);
            textview_imagename1.setText("");
            imageView2.setImageDrawable(null);
            textview_imagename2.setText("");
            imageView3.setImageDrawable(null);
            textview_imagename3.setText("");

            if (pre.isChecked())
                lastChecked = "pre";
            else if (during.isChecked())
                lastChecked = "during";
            else if (post.isChecked())
                lastChecked = "post";
            isClickSet = true;
        }
    });
    alertDialog2.setNegativeButton("NO", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            switch (curCheckedid) {
                case R.id.pre:
                    if (lastChecked.equals("during")){
                        isClickSet = false;
                        during.setChecked(true);
                        isClickSet = true;
                        lastChecked = "during";}
                    else if (lastChecked.equals("post")){
                        isClickSet = false;
                        post.setChecked(true);
                        isClickSet = true;
                        lastChecked = "post";}
                    break;
                case R.id.during:
                    if (lastChecked.equals("pre")){
                        isClickSet = false;
                        pre.setChecked(true);
                        isClickSet = true;
                        lastChecked = "pre";}
                    else if (lastChecked.equals("post")){
                        isClickSet = false;
                        post.setChecked(true);
                        isClickSet = true;
                        lastChecked = "post";}
                    break;
                case R.id.post:
                    if (lastChecked.equals("during")){
                        isClickSet = false;
                        during.setChecked(true);
                        isClickSet = true;
                        lastChecked = "during";}
                    else if (lastChecked.equals("pre")){
                        isClickSet = false;
                        pre.setChecked(true);
                        isClickSet = true;
                        lastChecked = "pre";}
                    break;
            }
        }
    });
    alertDialog2.show();
}

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