Android-控制输入法及相关用法

一. 控制输入法关闭与获取EditView的最大输入长度

public class ViewUtils {

    // 获取编辑框的最大长度，通过反射机制调用隐藏方法
    public static int getMaxLength(EditText et) {
        int length = 0;
        try {
            InputFilter[] inputFilters = et.getFilters();
            for (InputFilter filter : inputFilters) {
                Class<?> c = filter.getClass();
                if (c.getName().equals("android.text.InputFilter$LengthFilter")) {
                    Field[] f = c.getDeclaredFields();
                    for (Field field : f) {
                        if (field.getName().equals("mMax")) {
                            field.setAccessible(true);
                            length = (Integer) field.get(filter);
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return length;
    }

    public static void hideAllInputMethod(Activity act) {
        // 从系统服务中获取输入法管理器
        InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
        if (imm.isActive()) { // 软键盘如果已经打开则关闭之
            imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
        }
    }

    public static void hideOneInputMethod(Activity act, View v) {
        // 从系统服务中获取输入法管理器
        InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
        // 关闭屏幕上的输入法软键盘
        imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
    }

}

二. 在输入框输入固定长度后输入法关闭

/**
 * 控制输入框自动关闭输入法
 */
public class HideEditWatcher implements TextWatcher {

    private int maxLength;//控件最大长度变量
    private EditText editText;//需要监控的控件
    private CharSequence sequence;
    private Activity activity;

    public HideEditWatcher(EditText view, Activity activity) {
        editText = view;
        this.activity = activity;
        maxLength = ViewUtils.getMaxLength(editText);
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        sequence = charSequence;
    }

    @Override
    public void afterTextChanged(Editable editable) {
        if (sequence == null || sequence.length() == 0) {
            return;
        }
        if (sequence.length() == maxLength) {
            ViewUtils.hideOneInputMethod(activity, editText);
        }
    }
}

<EditText
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:maxLength="11" />

 EditText textView = findViewById(R.id.text);
 textView.addTextChangedListener(new HideEditWatcher(textView, this));

三. 当前输入框点击回车自动跳转到下一个输入框

public class JumpTextWatcher implements TextWatcher {

    private EditText thisView;
    private EditText nextView;

    public JumpTextWatcher(EditText thisView, EditText nextView) {
        this.thisView = thisView;
        this.nextView = nextView;
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void afterTextChanged(Editable editable) {
        String str = editable.toString();
        if (str.contains("\t") || str.contains("\n")) {
            thisView.setText(str.replace("\t", "").replace("\n", ""));
            nextView.requestFocus();
            nextView.setSelection(nextView.getText().length());
        }
    }
}

<EditText
        android:id="@+id/thisText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/nextText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

 EditText thisText = findViewById(R.id.thisText);
 EditText nextText = findViewById(R.id.nextText);
 thisText.addTextChangedListener(new JumpTextWatcher(thisText, nextText));

本文地址：https://blog.csdn.net/m0_48440239/article/details/110286686