这个方法很安全:

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

public class CustomEditText extends EditText {
    public CustomEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomEditText(Context context) {
        super(context);
    }

    public CustomEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }


    @Override
    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
        super.onFocusChanged(focused, direction, previouslyFocusedRect);
        this.setSelection(this.getText().length());
    }

    @Override
    protected void onSelectionChanged(int selStart, int selEnd) {

    }
}

在XML文件中使用此CustomEditText，这将起作用。我已经测试过了，它对我很有效。

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);

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

editText.accessibilityDelegate = object : View.AccessibilityDelegate() {
    override fun sendAccessibilityEvent(host: View?, eventType: Int) {
        super.sendAccessibilityEvent(host, eventType)
        if (eventType == TYPE_VIEW_TEXT_SELECTION_CHANGED) {
            editText.setSelection(editText.length())
        }
    }
}

在我的情况下，我创建了以下Kotlin ext.函数，可能对某人有用:

private fun EditText.focus(){
    requestFocus()
    setSelection(length())
}

然后按如下方式使用:

mEditText.focus()