问题描述

当我的一个 OptionsMenuItems 被点击时，我试图打开一个警告对话框.如果用户单击是"则继续操作，如果单击否"则取消.我只是不知道如何编写代码.这就是我所拥有的:

I'm trying to bring up an alert dialog box when one of my OptionsMenuItems is clicked. Proceed with operation if user clicks "yes", cancels if clicks no. I just don't know how to do the code. This is what I have:

@Override
public boolean onOptionsItemSelected(MenuItem item)
{ 

    switch (item.getItemId()) { 
    case R.id.exit:
        this.finish();
        return true;
    case R.id.about:
        Intent i = new Intent(this, AboutActivity.class);
        this.startActivity(i);
    case R.id.skip:
        AlertDialog.Builder alertbox = new AlertDialog.Builder(this);

            // set the message to display
            alertbox.setMessage("The yoga pose will be skipped from now on!").show();
           alertbox.setCancelable(true);
           alertbox.setNegativeButton("no").setPositiveButton("OK", new DialogClicklistener() { 

             // click listener on the alert box
            public boolean onClick(DialogInterface arg0, int arg1) {
                // the button was clicked
                boolean success = myDbHelper.setSkip(PoseID);
                SetImageView2(myDbHelper);
                return success;
              }

           });

           // add a neutral button to the alert box and assign a click listener
           alertbox.setCancelable(true).set(onCancelListener) {

              // click listener on the alert box
               public boolean onClick(DialogInterface arg0, int arg1) {
                // the button was clicked

              }
           });
           // show it
           alertbox.show();

     default: 
            return super.onOptionsItemSelected(item);
    }
}

推荐答案

以下内容直接来自我目前正在开发的应用程序.它会弹出一个 AlertDialog，然后将用户带到不同的活动(在他们输入密码之后).如果我能澄清任何事情，请告诉我.

The following is directly from the app I'm currently working on. It brings up an AlertDialog which then takes the user to a different activity (after they enter a password). Please let me know if I can clarify anything about it.

现在包括整个方法.

@Override
public boolean onOptionsItemSelected(MenuItem item) { 
    LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
    final int menuItem = item.getItemId();
    if ((menuItem == R.id.survey) || (menuItem == R.id.syncMode)) {
        View layout = inflater.inflate(R.layout.survey_password_dialog, (ViewGroup) findViewById(R.id.layout_root));
        final EditText password = (EditText) layout.findViewById(R.id.passwordText);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);            
        builder.setView(layout)
        .setCancelable(false)
        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int id) {   
            }
        })
        .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                dialog.cancel();
            }
        });
        final AlertDialog alertDialog = builder.create();
        alertDialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface dialog) {
                Button b = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE);
                b.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        if (password.getText().toString().equalsIgnoreCase("the_password")) {
                            if (menuItem == R.id.survey) {
                                Intent intent = new Intent(AsthmaAppActivity.this, SurveyActivity.class);
                                startActivity(intent);
                                alertDialog.dismiss();
                            }
                            else { //(menuItem == R.id.syncMode) 
                                startActivity(new Intent(AsthmaAppActivity.this, SyncMode.class));
                                alertDialog.dismiss();
                            }
                        }
                        else Toast.makeText(AsthmaAppActivity.this, "Password incorrect", Toast.LENGTH_LONG).show();
                    }
                });
            }
        });
        alertDialog.getWindow().setSoftInputMode (WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
        alertDialog.show();
    }
    else {  //dialog for setting application parameters "on the fly" for application testing
        View layout = inflater.inflate(R.layout.parameter_change, (ViewGroup) findViewById(R.id.layout_root));
        final EditText parameter = (EditText) layout.findViewById(R.id.parameterText);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setView(layout)
        .setCancelable(false)
        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {  
                String parameterString = parameter.getText().toString();
                if(parameterString == null || parameterString.isEmpty()) {
                    testParam = 0.0;
                } 
                else {
                    testParam = Double.parseDouble(parameterString);
                }
            }
        })
        .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                dialog.cancel();
            }
        })
        .show();
    }
    return(super.onOptionsItemSelected(item));
} 

这篇关于onOptionsItemSelected android中的警报对话框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！