Android学习笔记3

public class CheckBoxActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {
    @Override 
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_check_box);
        CheckBox system_checkbox = findViewById(R.id.system_checkbox);
        CheckBox custom_checkbox = findViewById(R.id.custom_checkbox);
        system_checkbox.setOnCheckedChangeListener(this);
        custom_checkbox.setOnCheckedChangeListener(this);
    }
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        String desc = String.format("你%s了这个CheckBox", isChecked ? "勾选" : "取消勾选");
        buttonView.setText(desc);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="请选择你的性别" />
    <RadioGroup
        android:id="@+id/select_gender"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="10dp">
        <RadioButton
            android:id="@+id/sex_male"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="男" />
        <RadioButton
            android:id="@+id/sex_female"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="女" />
    </RadioGroup>
    <TextView
        android:id="@+id/show_sex"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp" />
</LinearLayout>

public class RadioHorizaontalActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {
    private TextView show_sex;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_radio_horizaontal);
        RadioGroup select_gender = findViewById(R.id.select_gender);
        show_sex = findViewById(R.id.show_sex);
        select_gender.setOnCheckedChangeListener(this);
    }
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch (checkedId){
            case R.id.sex_male:
                show_sex.setText("你是一个man");
                break;
            case R.id.sex_female:
                show_sex.setText("你是一个women");
                break;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">
    <EditText
        android:id="@+id/phone_num"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:background="@drawable/edittext_slelect"
        android:hint="请输入手机号码"
        android:inputType="number"
        android:maxLength="11" />
    <EditText
        android:id="@+id/input_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:background="@drawable/edittext_slelect"
        android:hint="请输入6位密码"
        android:inputType="numberPassword"
        android:textColor="@color/green"
        android:maxLength="6"/>
    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="登录" />
</LinearLayout>

public class EditFocusActivity extends AppCompatActivity implements View.OnFocusChangeListener {
    private TextView input_phone;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_focus);
        input_phone = findViewById(R.id.phone_num);
        EditText password = findViewById(R.id.input_password);
        password.setOnFocusChangeListener(this);
    }
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            String phone = input_phone.getText().toString();
            //提示手机号码不足11位
            if (TextUtils.isEmpty(phone) || phone.length() < 11){
                input_phone.requestFocus();
                Toast.makeText(this, "请输入11位手机号码", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

public class EditHideActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_hind);
        EditText input_phone1 = findViewById(R.id.phone_num1);
        EditText password1 = findViewById(R.id.input_password1);
        input_phone1.addTextChangedListener(new HideTextWather(input_phone1, 11));
        password1.addTextChangedListener(new HideTextWather(password1, 6));
    }
    //编辑框监听器，输入文本达到要求自动隐藏输入法
    private class HideTextWather implements TextWatcher {
        //编辑框对象
        private EditText mView;
        //最大长度变量
        private int mMaxLenght;
        public HideTextWather(EditText mView, int mMaxLenght) {
            this.mView = mView;
            this.mMaxLenght = mMaxLenght;
        }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }
        //编辑框输入文本变化之后触发
        @Override
        public void afterTextChanged(Editable s) {
            //获得输入的文本字符串
            String str =s.toString();
            //输入文本达到11 位或者 6 位时关闭输入法
            if (str.length() == mMaxLenght){
                //就隐藏输入法键盘
                ViewUtil.hideOneInputMethod(EditHideActivity.this,mView);
            }
        }
    }
}

public class DatePickerActivity extends AppCompatActivity implements View.OnClickListener, DatePickerDialog.OnDateSetListener {
    private DatePicker date;
    private TextView tv_date_text;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_date_picker);
        findViewById(R.id.tv_btn_date).setOnClickListener(this);
        findViewById(R.id.tv_btn_date_alert).setOnClickListener(this);
        tv_date_text = findViewById(R.id.tv_date_text);
        date = findViewById(R.id.date_picker1);
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.tv_btn_date:
                String desc = String.format("您选择的日期是 %d 年 %d 月 %d 日", date.getYear(), date.getMonth() + 1, date.getDayOfMonth());
                tv_date_text.setText(desc);
                break;
            case R.id.tv_btn_date_alert:
                //获取日历的当前时间
                Calendar ca = Calendar.getInstance();
                DatePickerDialog dialog = new DatePickerDialog(this, this,
                        ca.get(Calendar.YEAR), ca.get(Calendar.MONTH), ca.get(Calendar.DAY_OF_MONTH));
                //显示日期对话框
                dialog.show();
                break;
        }
    }
    @Override
    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
        String desc = String.format("您选择的日期是 %d 年 %d 月 %d 日", year, month + 1, dayOfMonth);
        tv_date_text.setText(desc);
    }
}

package com.example.datastorage;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.contentcapture.ContentCaptureSession;
import android.widget.CheckBox;
import android.widget.EditText;
public class ShareWriteActivity extends AppCompatActivity implements View.OnClickListener {
    private EditText et_name;
    private EditText et_age;
    private EditText et_height;
    private EditText et_weight;
    private CheckBox ck_married;
    private SharedPreferences preferences;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_share_write);
        et_name = findViewById(R.id.et_name);
        et_age = findViewById(R.id.et_age);
        et_height = findViewById(R.id.et_height);
        et_weight = findViewById(R.id.et_weight);
        ck_married = findViewById(R.id.ck_married);
        findViewById(R.id.btn_save).setOnClickListener(this);
        preferences = getSharedPreferences("config", Context.MODE_PRIVATE);
        reload();
    }
    private void reload() {
        String name = preferences.getString("name", null);
        if (name != null) {
            et_name.setText(name);
        }
        int age = preferences.getInt("age", 0);
        if (age != 0) {
            et_age.setText(String.valueOf(age));
        }
        float height = preferences.getFloat("height", 0f);
        if (height != 0f) {
            et_height.setText(String.valueOf(height));
        }
        float weight = preferences.getFloat("weight", 0f);
        if (weight != 0f) {
            et_weight.setText(String.valueOf(weight));
        }
        boolean married = preferences.getBoolean("married", false);
        ck_married.setChecked(married);
    }
    @Override
    public void onClick(View v) {
        String name = et_name.getText().toString();
        String age = et_age.getText().toString();
        String height = et_height.getText().toString();
        String weight = et_weight.getText().toString();
        //编辑器
        SharedPreferences.Editor editor = preferences.edit();
        editor.putString("name", name);
        editor.putInt("age", Integer.parseInt(age));
        editor.putFloat("height", Float.parseFloat(height));
        editor.putFloat("weight", Float.parseFloat(weight));
        editor.putBoolean("married", ck_married.isChecked());
        editor.commit();
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/tv_name"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="姓名："
            android:textColor="@color/black"
            android:textSize="17sp" />
        <EditText
            android:id="@+id/et_name"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="3dp"
            android:layout_marginBottom="3dp"
            android:layout_weight="1"
            android:background="@drawable/edittext_select"
            android:hint="请输入姓名"
            android:inputType="text"
            android:maxLength="12"
            android:textColor="@color/black"
            android:textSize="17sp" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/tv_age"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="年龄："
            android:textColor="@color/black"
            android:textSize="17sp" />
        <EditText
            android:id="@+id/et_age"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="3dp"
            android:layout_marginBottom="3dp"
            android:layout_weight="1"
            android:background="@drawable/edittext_select"
            android:hint="请输入年龄"
            android:inputType="number"
            android:maxLength="2"
            android:textColor="@color/black"
            android:textSize="17sp" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/tv_height"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="身高："
            android:textColor="@color/black"
            android:textSize="17sp" />
        <EditText
            android:id="@+id/et_height"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="3dp"
            android:layout_marginBottom="3dp"
            android:layout_weight="1"
            android:background="@drawable/edittext_select"
            android:hint="请输入身高"
            android:inputType="number"
            android:maxLength="3"
            android:textColor="@color/black"
            android:textSize="17sp" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/tv_weight"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="体重："
            android:textColor="@color/black"
            android:textSize="17sp" />
        <EditText
            android:id="@+id/et_weight"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="3dp"
            android:layout_marginBottom="3dp"
            android:layout_weight="1"
            android:background="@drawable/edittext_select"
            android:hint="请输入体重"
            android:inputType="numberDecimal"
            android:maxLength="5"
            android:textColor="@color/black"
            android:textSize="17sp" />
    </LinearLayout>
    <CheckBox
        android:id="@+id/ck_married"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="false"
        android:gravity="center"
        android:text="已婚"
        android:textColor="@color/black"
        android:textSize="17sp" />
    <Button
        android:id="@+id/btn_save"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="保存到共享参数"
        android:textColor="@color/black"
        android:textSize="17sp" />
</LinearLayout>