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一、前言：

这篇文章是关于当我们输入账号密码时，达到11位（自定义）时，自动隐藏键盘。

二、上代码：

界面布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <RadioGroup
        android:id="@+id/rg_login"
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/rb_password"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:checked="true"
            android:text="@string/login_by_password"
            android:textSize="@dimen/common_font_size" />

        <RadioButton
            android:id="@+id/rb_verifycode"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="@string/login_by_verifycode"
            android:textSize="@dimen/common_font_size" />

    </RadioGroup>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/phone_number"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />

        <EditText
            android:id="@+id/et_phone"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"
            android:layout_weight="1"
            android:inputType="number"
            android:hint="@string/input_phone_number"
            android:maxLength="11"
            android:textColorHint="@color/gray"
            android:textSize="@dimen/common_font_size" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/tv_password"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/login_password"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">

            <EditText
                android:id="@+id/et_password"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="5dp"
                android:layout_marginBottom="5dp"
                android:layout_weight="1"
                android:hint="@string/input_password"
                android:inputType="numberPassword"
                android:maxLength="11"
                android:textColorHint="@color/gray"
                android:textSize="@dimen/common_font_size" />

            <Button
                android:id="@+id/btn_forget"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_alignParentEnd="true"
                android:text="@string/foget_password"
                android:textColor="@color/black"
                android:textSize="@dimen/common_font_size" />
        </RelativeLayout>
    </LinearLayout>

    <CheckBox
        android:id="@+id/ck_remember"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/remember_password"
        android:textColor="@color/black"
        android:textSize="@dimen/common_font_size" />

    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/login"
        android:textSize="@dimen/buttom_font_size" />

</LinearLayout>

对应的Activity：LoginMainActivity

public class LoginMainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {

    private TextView tv_password;
    private EditText et_password;
    private Button btn_forget;
    private CheckBox ck_remember;
    private EditText et_phone;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_main);
        RadioGroup rg_login = findViewById(R.id.rg_login);
        tv_password = findViewById(R.id.tv_password);
        et_phone = findViewById(R.id.et_phone);
        et_password = findViewById(R.id.et_password);
        btn_forget = findViewById(R.id.btn_forget);
        ck_remember = findViewById(R.id.ck_remember);
        //给rg_login设置单选监听器
        rg_login.setOnCheckedChangeListener(this);
        //给et_phone添加文本变更器
        et_phone.addTextChangedListener(new HideTextWatcher(et_phone,11));
        //给et_password添加文本变更器
        et_password.addTextChangedListener(new HideTextWatcher(et_password,6));
    }

    @Override
    public void onCheckedChanged(RadioGroup radioGroup, int i) {
        switch (i){
            //选择密码登录
            case R.id.rb_password:
                tv_password.setText(getString(R.string.login_password));
                et_password.setHint(getString(R.string.input_password));
                btn_forget.setText(getString(R.string.foget_password));
                ck_remember.setVisibility(View.VISIBLE);
                break;
                //选择验证码登录
            case R.id.rb_verifycode:
                tv_password.setText(getString(R.string.verifycode));
                et_password.setHint(getString(R.string.input_verifycode));
                btn_forget.setText(getString(R.string.get_verifycode));
                ck_remember.setVisibility(View.GONE);
                break;
        }
    }

    //定义一个编辑框监听器，在输入文本达到指定长度时自动隐藏输入法
    private class HideTextWatcher implements TextWatcher {
        private  EditText mView;
        private int mMaxLength;
        public HideTextWatcher(EditText v, int maxLength) {
            this.mView = v;
            this.mMaxLength = maxLength;

        }

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

        }

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

        }

        //在编辑框的输入文本变化后触发
        @Override
        public void afterTextChanged(Editable s) {
          //获得已输入的文本字符串
            String str = s.toString();
            if (str.length() == mMaxLength){
                //隐藏输入法软键盘
                ViewUtil.hideOneInputMethod(LoginMainActivity.this,mView);
            }
        }
    }
}

新建一个工具类：ViewUtil

public class ViewUtil {
    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);
    }
}