editText.setOnKeyListener(new View.OnKeyListener() {
    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        editText.setSelection(editText.getText().length());
        return false;
    }
});

如果你想选择所有文本，只是输入新的文本而不是旧的，你可以使用

    android:selectAllOnFocus="true"

/**
 * Set cursor to end of text in edittext when user clicks Next on Keyboard.
 */
View.OnFocusChangeListener onFocusChangeListener = new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View view, boolean b) {
        if (b) {
            ((EditText) view).setSelection(((EditText) view).getText().length());
        }
    }
};

mEditFirstName.setOnFocusChangeListener(onFocusChangeListener); 
mEditLastName.setOnFocusChangeListener(onFocusChangeListener);

这对我很有用!

科特林：

将光标设置到起始位置:

val editText = findViewById(R.id.edittext_id) as EditText
editText.setSelection(0)

将光标设置到EditText的末尾:

val editText = findViewById(R.id.edittext_id) as EditText
editText.setSelection(editText.text.length)

下面的Code是将光标放在第二个字符之后:

val editText = findViewById(R.id.edittext_id) as EditText
editText.setSelection(2)

JAVA:

将光标设置到起始位置:

 EditText editText = (EditText)findViewById(R.id.edittext_id);
 editText.setSelection(0);

将光标设置到EditText的末尾:

EditText editText = (EditText)findViewById(R.id.edittext_id);
editText.setSelection(editText.getText().length());

下面的Code是将光标放在第二个字符之后:

EditText editText = (EditText)findViewById(R.id.edittext_id);
editText.setSelection(2);

这个方法很安全:

    editText.setText("");
    if (!TextUtils.isEmpty(text)) {
        editText.append(text);
    }

我认为这可以达到你想要的效果。

 Editable etext = mSubjectTextEditor.getText();
 Selection.setSelection(etext, etext.length());