隐藏:

edtPassword.setInputType(InputType.TYPE_CLASS_TEXT);
edtPassword.setTransformationMethod(null);

显示:

edtPassword.setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD);                    
edtPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());

我知道期望的答案是Java。但这里是我的2美分的建议，总是尝试处理XML中的视图相关的东西(至少基本的东西)，所以我宁愿使用XML属性，而不是在java中处理这个用例

    <EditText
     android:inputType="textPassword"/>

取消隐藏密码:

editText.setInputType(
      InputType.TYPE_CLASS_TEXT|
      InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD
);

再次隐藏密码:

editText.setTransformationMethod(PasswordTransformationMethod.getInstance());

下面是标准键盘上显示的各种输入类型。

以编程方式设置输入类型

editText.setInputType(InputType.TYPE_CLASS_TEXT);

除了TYPE_CLASS_TEXT之外的其他选项可以在文档中找到。

在XML中设置输入类型

<EditText
    android:inputType="text"
/>

文本之外的其他选项可以在文档中找到。

附加的代码

下面是上面图像的代码。

public class MainActivity extends AppCompatActivity {

    EditText editText;
    TextView textView;
    List<InputTypeItem> inputTypes;
    int counter = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = findViewById(R.id.editText);
        textView = findViewById(R.id.textView);
        initArray();
    }

    public void onChangeInputTypeButtonClick(View view) {
        if (counter >= inputTypes.size()) {
            startOver();
            return;
        }
        textView.setText(inputTypes.get(counter).name);
        editText.setInputType(inputTypes.get(counter).value);
        editText.setSelection(editText.getText().length());
        counter++;
    }

    private void startOver() {
        counter = 0;
        textView.setText("");
        editText.setInputType(InputType.TYPE_CLASS_TEXT);
        InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(editText.getWindowToken(), 0);
    }


    private void initArray() {
        inputTypes = new ArrayList<>();
        inputTypes.add(new InputTypeItem("date",  InputType.TYPE_CLASS_DATETIME | InputType.TYPE_DATETIME_VARIATION_DATE));
        inputTypes.add(new InputTypeItem("datetime", InputType.TYPE_CLASS_DATETIME | InputType.TYPE_DATETIME_VARIATION_NORMAL));
        inputTypes.add(new InputTypeItem("none", InputType.TYPE_NULL));
        inputTypes.add(new InputTypeItem("number",  InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_VARIATION_NORMAL));
        inputTypes.add(new InputTypeItem("numberDecimal",  InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL));
        inputTypes.add(new InputTypeItem("numberPassword",  InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_VARIATION_PASSWORD));
        inputTypes.add(new InputTypeItem("numberSigned", InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_SIGNED));
        inputTypes.add(new InputTypeItem("phone",  InputType.TYPE_CLASS_PHONE));
        inputTypes.add(new InputTypeItem("text",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_NORMAL));
        inputTypes.add(new InputTypeItem("textAutoComplete", InputType.TYPE_TEXT_FLAG_AUTO_COMPLETE));
        inputTypes.add(new InputTypeItem("textAutoCorrect",  InputType.TYPE_TEXT_FLAG_AUTO_CORRECT));
        inputTypes.add(new InputTypeItem("textCapCharacters",  InputType.TYPE_TEXT_FLAG_CAP_CHARACTERS));
        inputTypes.add(new InputTypeItem("textCapSentences",  InputType.TYPE_TEXT_FLAG_CAP_SENTENCES));
        inputTypes.add(new InputTypeItem("textCapWords",  InputType.TYPE_TEXT_FLAG_CAP_WORDS));
        inputTypes.add(new InputTypeItem("textEmailAddress",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS));
        inputTypes.add(new InputTypeItem("textEmailSubject", InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_EMAIL_SUBJECT));
        inputTypes.add(new InputTypeItem("textFilter",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_FILTER));
        inputTypes.add(new InputTypeItem("textLongMessage",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_LONG_MESSAGE));
        inputTypes.add(new InputTypeItem("textMultiLine",  InputType.TYPE_TEXT_FLAG_MULTI_LINE));
        inputTypes.add(new InputTypeItem("textNoSuggestions", InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS));
        inputTypes.add(new InputTypeItem("textPassword",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD));
        inputTypes.add(new InputTypeItem("textPersonName", InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PERSON_NAME));
        inputTypes.add(new InputTypeItem("textPhonetic",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PHONETIC));
        inputTypes.add(new InputTypeItem("textPostalAddress", InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_POSTAL_ADDRESS));
        inputTypes.add(new InputTypeItem("textShortMessage", InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_SHORT_MESSAGE));
        inputTypes.add(new InputTypeItem("textUri",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_URI));
        inputTypes.add(new InputTypeItem("textVisiblePassword",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD));
        inputTypes.add(new InputTypeItem("textWebEditText",  InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_WEB_EDIT_TEXT));
        inputTypes.add(new InputTypeItem("textWebEmailAddress", InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_WEB_EMAIL_ADDRESS));
        inputTypes.add(new InputTypeItem("textWebPassword", InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_WEB_PASSWORD));
        inputTypes.add(new InputTypeItem("time", InputType.TYPE_CLASS_DATETIME | InputType.TYPE_DATETIME_VARIATION_TIME));
    }

    class InputTypeItem {
        private String name;
        private int value;
        InputTypeItem(String name, int value) {
            this.name = name;
            this.value = value;
        }
    }
}

另请参阅

获取当前的InputType

尝试将此添加到布局中的EditText/TextView标签

android:password="true"

编辑:我刚刚重读了你的帖子，也许你需要在施工后这样做。我不明白你的片段为什么不管用。

只允许数字:

password1.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_CLASS_NUMBER);

转换(隐藏)密码:

password1.setTransformationMethod(PasswordTransformationMethod.getInstance());