java - 无法从按钮监听器接收数据

Question

我想制作按钮，当我点击它时会出现一个对话框，然后我从该对话框中读取数据。在对话框中，我只有 EditText 用于数据。我的数据是数字。这是我的代码:

Button mSaveButton = (Button) findViewById(R.id.saveButton);
        mSaveButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder mBuilder = new AlertDialog.Builder(ReportActivity.this);
                View mView = getLayoutInflater().inflate(R.layout.dialog_for_percent , null);
                EditText savingsDialog = (EditText) mView.findViewById(R.id.percentEditText);
                mBuilder.setView(mView)
                        .setPositiveButton(R.string.done, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int id) {

                                Context context = getApplicationContext();
                                Toast.makeText(context, "Done", Toast.LENGTH_SHORT).show();
                            }
                        })
                        .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int id) {
                                dialog.dismiss();
                            }
                        });
                AlertDialog dialog = mBuilder.create();
                dialog.show();
                //if (savingsDialog.getText().toString().length() > 0) { I tried this if, but I receive empty data
                    SharedPreferences savings = getSharedPreferences(PREFS_NAME, 0);
                    SharedPreferences.Editor editor = savings.edit();
                    editor.putString("percent", savingsDialog.getText().toString());
                    editor.commit();

                    updateSavingsView(Integer.parseInt(savingsDialog.getText().toString()));// here I want to put my data in method which update my TextView
                //}
            }
        });

方法(如果你需要的话)

public void updateSavingsView(int savings){

        TextView savingsTextView = (TextView) findViewById(R.id.saverTextView);
        savingsTextView.setText("Save " + savings + "% per month");

        TextView monthlySavings = (TextView) findViewById(R.id.savingsMoney);
        if(savings == 0 || Integer.parseInt(income.getText().toString()) == 0 ) {
            monthlySavings.setText("0");
        }
        else{

            monthlySavings.setText(Integer.toString((Integer.parseInt(income.getText().toString()) * savings) / 100));
        }

所以问题是，当我在没有 if 语句的情况下运行程序时，出现错误 java.lang.NumberFormatException: For input string: ""。这是因为它读取空字符串并想要解析它。然后我添加 if 语句来避免这个问题，但它不起作用。我的问题是。我如何重写此监听器以避免这些问题并存储正确的数据？

Answer 1

将你的代码放在积极的监听器中

    Button mSaveButton = (Button) findViewById(R.id.saveButton);
        mSaveButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder mBuilder = new AlertDialog.Builder(ReportActivity.this);
                View mView = getLayoutInflater().inflate(R.layout.dialog_for_percent , null);
                final EditText savingsDialog = (EditText) mView.findViewById(R.id.percentEditText);
                mBuilder.setView(mView)
                        .setPositiveButton(R.string.done, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int id) {

                                Context context = getApplicationContext();
                                Toast.makeText(context, "Done", Toast.LENGTH_SHORT).show();

                    SharedPreferences savings = getSharedPreferences(PREFS_NAME, 0);
                    SharedPreferences.Editor editor = savings.edit();
                    editor.putString("percent", savingsDialog.getText().toString());
                    editor.commit();

                    updateSavingsView(Integer.parseInt(savingsDialog.getText().toString()));
                            }
                        })
                        .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int id) {
                                dialog.dismiss();
                            }
                        });
                AlertDialog dialog = mBuilder.create();
                dialog.show();
             }
            }
        });