• 对话框

    1.焦点变更监听器

    1. "1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     android:orientation="vertical"
    8.     tools:context=".EditFocusActivity"
    9.     android:padding="5dp">
    10.  
    11.  
    12.     <EditText
    13.         android:id="@+id/et_phone"
    14.         android:layout_width="match_parent"
    15.         android:layout_height="wrap_content"
    16.         android:hint="请输入11位手机号码"
    17.         android:inputType="text"
    18.         android:maxLength="11"
    19.         android:padding="6dp"
    20.         android:layout_margin="5dp"
    21.         android:background="@drawable/edit_select"/>
    22.  
    23.     <EditText
    24.         android:id="@+id/et_password"
    25.         android:layout_width="match_parent"
    26.         android:layout_height="wrap_content"
    27.         android:hint="请输入密码"
    28.         android:padding="6dp"
    29.         android:inputType="numberPassword"
    30.         android:layout_margin="5dp"
    31.         android:background="@drawable/edit_select"
    32.         android:maxLength="11"/>
    33.  
    34.  
    35.     <Button
    36.         android:id="@+id/btn_login"
    37.         android:layout_width="match_parent"
    38.         android:layout_margin="5dp"
    39.         android:layout_height="wrap_content"
    40.         android:text="登录"/>
    41.  
    42.  
    43. LinearLayout>
    1. package com.tiger.chapter05;
    2.  
    3. import androidx.appcompat.app.AppCompatActivity;
    4.  
    5. import android.os.Bundle;
    6. import android.view.View;
    7. import android.widget.EditText;
    8. import android.widget.Toast;
    9.  
    10. public class EditFocusActivity extends AppCompatActivity implements View.OnFocusChangeListener {
    11.  
    12.     private EditText et_phone;
    13.     private EditText et_password;
    14.  
    15.     @Override
    16.     protected void onCreate(Bundle savedInstanceState) {
    17.         super.onCreate(savedInstanceState);
    18.         setContentView(R.layout.activity_edit_focus);
    19.  
    20.         et_phone = findViewById(R.id.et_phone);
    21.         et_password = findViewById(R.id.et_password);
    22.  
    23.         et_password.setOnFocusChangeListener(this);
    24.     }
    25.  
    26.     @Override
    27.     public void onFocusChange(View v, boolean hasFocus) {
    28.             if (hasFocus){
    29.                 String phone = et_phone.getText().toString();
    30.                 if (phone==null||phone.length()<11){
    31.                     //手机号码编辑框请求焦点，也就是把光标移回手机号码编辑框
    32.                     et_phone.requestFocus();
    33.                     Toast.makeText(this,"请输入11位手机号码",Toast.LENGTH_SHORT).show();//short短时间小时
    34.  
    35.                 }
    36.             }
    37.     }
    38. }

    2.文本变化监听器

     

    1. "1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     android:orientation="vertical"
    8.     android:padding="5dp"
    9.     tools:context=".EditHideActivity">
    10.  
    11.     <EditText
    12.         android:id="@+id/et_phone"
    13.         android:layout_width="match_parent"
    14.         android:layout_height="wrap_content"
    15.         android:hint="输入11位时自动隐藏输入法"
    16.         android:layout_margin="5dp"
    17.         android:padding="5dp"
    18.         android:background="@drawable/edit_select"
    19.         android:inputType="text"
    20.         android:maxLength="11"
    21.         />
    22.  
    23.     <EditText
    24.         android:id="@+id/et_password"
    25.         android:layout_width="match_parent"
    26.         android:layout_height="wrap_content"
    27.         android:hint="输入6位自动隐藏输入法"
    28.         android:layout_margin="5dp"
    29.         android:padding="5dp"
    30.         android:inputType="textPassword"
    31.         android:background="@drawable/edit_select"
    32.         android:maxLength="6"
    33.         />
    34.  
    35.  
    36.  
    37.  
    38. LinearLayout>
    1. package com.tiger.chapter05.util;
    2.  
    3. import android.app.Activity;
    4. import android.content.Context;
    5. import android.view.View;
    6. import android.view.inputmethod.InputMethodManager;
    7.  
    8. public class ViewUtil {
    9.     public static  void hideOneInputMethod(Activity act, View view){
    10.         //从系统服务中获取输入法管理器
    11.         InputMethodManager manager = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
    12.         //关闭屏幕上的输入法软键盘
    13.         manager.hideSoftInputFromWindow(view.getWindowToken(), 0);
    14.  
    15.     }
    16. }
    1. package com.tiger.chapter05;
    2.  
    3. import androidx.appcompat.app.AppCompatActivity;
    4.  
    5. import android.os.Bundle;
    6. import android.text.Editable;
    7. import android.text.TextWatcher;
    8. import android.view.View;
    9. import android.widget.EditText;
    10. import android.widget.ImageButton;
    11.  
    12. import com.tiger.chapter05.util.ViewUtil;
    13.  
    14. public class EditHideActivity extends AppCompatActivity {
    15.  
    16.     @Override
    17.     protected void onCreate(Bundle savedInstanceState) {
    18.         super.onCreate(savedInstanceState);
    19.         setContentView(R.layout.activity_edit_hide);
    20.         EditText et_phone = findViewById(R.id.et_phone);
    21.         EditText et_password = findViewById(R.id.et_password);
    22.  
    23.         et_phone.addTextChangedListener(new HideTextWatcher(et_phone,11));
    24.         et_password.addTextChangedListener(new HideTextWatcher(et_password,6));
    25.     }
    26.  
    27. //内存泄漏
    28.     private  class HideTextWatcher implements TextWatcher {
    29.         private EditText mView;
    30.         private Integer maxLength;
    31.  
    32.         public HideTextWatcher(EditText mView, Integer maxLength) {
    33.             this.mView = mView;
    34.             this.maxLength = maxLength;
    35.         }
    36.  
    37.         @Override
    38.         public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    39.  
    40.         }
    41.  
    42.         @Override
    43.         public void onTextChanged(CharSequence s, int start, int before, int count) {
    44.  
    45.         }
    46.  
    47.         @Override
    48.         public void afterTextChanged(Editable s) {
    49.  
    50.             //获得已输入的文本字符串
    51.             String str = s.toString();
    52.  
    53.             //输入文本达到11位 （如手机号码）,或者达到6位 (如登录密码)时 关闭输入法
    54.  
    55.             if (str.length()== maxLength){
    56.                 ViewUtil.hideOneInputMethod(EditHideActivity.this,mView);
    57.             }
    58.  
    59.         }
    60.     }
    61. }

    3. 提醒对话框

    1. "1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     android:orientation="vertical"
    8.     android:padding="5dp"
    9.     tools:context=".CheckBoxActivity">
    10.  
    11.  
    12.     <Button
    13.         android:id="@+id/btn_alert"
    14.         android:layout_width="match_parent"
    15.         android:layout_height="wrap_content"
    16.         android:text="弹出提醒对话框" />
    17.  
    18.     <TextView
    19.         android:id="@+id/tv_alert"
    20.         android:layout_width="match_parent"
    21.         android:layout_height="wrap_content"
    22.         android:layout_marginTop="5dp" />
    23.  
    24.  
    25. LinearLayout>

     

    1. package com.tiger.chapter05;
    2.  
    3. import androidx.appcompat.app.AlertDialog;
    4. import androidx.appcompat.app.AppCompatActivity;
    5.  
    6. import android.content.DialogInterface;
    7. import android.os.Bundle;
    8. import android.view.View;
    9. import android.widget.Button;
    10. import android.widget.TextView;
    11.  
    12. public class AlertDialogActivity extends AppCompatActivity implements View.OnClickListener {
    13.  
    14.     private TextView tv_alert;
    15.  
    16.     @Override
    17.     protected void onCreate(Bundle savedInstanceState) {
    18.         super.onCreate(savedInstanceState);
    19.         setContentView(R.layout.activity_alert_dialog);
    20.         findViewById(R.id.btn_alert).setOnClickListener(this);
    21.         tv_alert = findViewById(R.id.tv_alert);
    22.     }
    23.  
    24.     @Override
    25.     public void onClick(View v) {
    26.         //创建提醒对话框的建造器
    27.         //这个Builder是个静态内部类
    28.         AlertDialog.Builder builder = new AlertDialog.Builder(this)//将上下文放进去
    29.                 .setTitle("尊敬的用户")//设置对话框的标题文本
    30.                 .setMessage("你真的要卸载我吗?")//设置对话框的内容文本
    31.                 .setPositiveButton("残忍卸载", new DialogInterface.OnClickListener() {
    32.                     @Override
    33.                     public void onClick(DialogInterface dialog, int which) {
    34.                         tv_alert.setText("虽然依依不舍，但是只能离开了");
    35.                     }
    36.                 })//设置对话框的肯定按钮文本及其点击监听器
    37.                 .setNegativeButton("我再想想", new DialogInterface.OnClickListener() {
    38.                     @Override
    39.                     public void onClick(DialogInterface dialog, int which) {
    40.                         tv_alert.setText("让我再陪你三百六十五个日夜");
    41.                     }
    42.                 });//设置对话框的否定按钮文本及其点击监听器
    43.  
    44.         //根据建造起创建提醒对话框对象
    45.         AlertDialog alertDialog = builder.create();
    46.         //显示提醒对话框
    47.         alertDialog.show();
    48.  
    49.  
    50.  
    51.     }
    52. }

    4.日期对话框

    1. "1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     android:orientation="vertical"
    8.     android:padding="5dp"
    9.     tools:context=".DatePickerActivity">
    10.  
    11.     <ScrollView
    12.         android:layout_width="match_parent"
    13.         android:layout_height="wrap_content">
    14.  
    15.         <LinearLayout
    16.             android:layout_width="match_parent"
    17.             android:layout_height="wrap_content"
    18.             android:orientation="vertical">
    19.  
    20.             <DatePicker
    21.                 android:id="@+id/dp_date1"
    22.                 android:layout_width="match_parent"
    23.                 android:layout_height="wrap_content"
    24.                 android:datePickerMode="spinner"
    25.                 android:calendarViewShown="false"/>
    26.  
    27.             <LinearLayout
    28.                 android:layout_width="match_parent"
    29.                 android:layout_height="wrap_content"
    30.                 android:gravity="center">
    31.                 <DatePicker
    32.                     android:id="@+id/dp_date2"
    33.                     android:layout_width="wrap_content"
    34.                     android:layout_height="wrap_content"
    35.                     android:datePickerMode="calendar"
    36.                     />
    37.             LinearLayout>
    38.  
    39.             <Button
    40.                 android:id="@+id/btn_ok"
    41.                 android:layout_width="match_parent"
    42.                 android:layout_height="wrap_content"
    43.                 android:text="确定" />
    44.  
    45.  
    46.             <TextView
    47.                 android:id="@+id/tv_date"
    48.                 android:layout_width="match_parent"
    49.                 android:layout_height="wrap_content"/>
    50.  
    51.  
    52.  
    53.             <Button
    54.                 android:id="@+id/btn_date"
    55.                 android:layout_width="match_parent"
    56.                 android:layout_height="wrap_content"
    57.                 android:text="弹出日期对话框" />
    58.  
    59.  
    60.         LinearLayout>
    61.  
    62.  
    63.  
    64.  
    65.     ScrollView>
    66.  
    67.  
    68.  
    69.  
    70.  
    71.     
    72. LinearLayout>

     

    1. package com.tiger.chapter05;
    2.  
    3. import androidx.appcompat.app.AppCompatActivity;
    4.  
    5. import android.os.Bundle;
    6. import android.view.View;
    7. import android.widget.Button;
    8. import android.widget.DatePicker;
    9. import android.widget.TextView;
    10.  
    11. public class DatePickerActivity extends AppCompatActivity implements View.OnClickListener {
    12.  
    13.     private DatePicker dp_date1;
    14.     private DatePicker dp_date2;
    15.  
    16.     private TextView viewById;
    17.  
    18.     private Button button;
    19.  
    20.     @Override
    21.     protected void onCreate(Bundle savedInstanceState) {
    22.         super.onCreate(savedInstanceState);
    23.         setContentView(R.layout.activity_date_picker);
    24.         findViewById(R.id.btn_ok).setOnClickListener(this);
    25.         dp_date1 = findViewById(R.id.dp_date1);
    26.         dp_date2 = findViewById(R.id.dp_date2);
    27.         viewById = findViewById(R.id.tv_date);
    28.         button = findViewById(R.id.btn_date);
    29.  
    30.  
    31.     }
    32.  
    33.     @Override
    34.     public void onClick(View v) {
    35.         if (v.getId() == R.id.btn_ok) {
    36.             //月份 是0开始 所以加一
    37.             String desc = String.format("您选择的日期是 %d年%d月%d日", dp_date1.getYear(), dp_date1.getMonth()+1, dp_date1.getDayOfMonth())+"\n";
    38.             String desc2 = String.format("您选择的日期是 %d年%d月%d日", dp_date2.getYear(), dp_date2.getMonth()+1, dp_date2.getDayOfMonth());
    39.         String result = desc+desc2;
    40.  
    41.         viewById.setText(result);
    42.  
    43.  
    44.         }else {
    45.  
    46.         }
    47.  
    48.  
    49.     }
    50. }

    1. package com.tiger.chapter05;
    2.  
    3. import androidx.appcompat.app.AppCompatActivity;
    4.  
    5. import android.app.DatePickerDialog;
    6. import android.os.Bundle;
    7. import android.view.View;
    8. import android.widget.Button;
    9. import android.widget.DatePicker;
    10. import android.widget.TextView;
    11.  
    12. import java.util.Calendar;
    13.  
    14. public class DatePickerActivity extends AppCompatActivity implements View.OnClickListener, DatePickerDialog.OnDateSetListener {
    15.  
    16.     private DatePicker dp_date1;
    17.     private DatePicker dp_date2;
    18.  
    19.     private TextView viewById;
    20.  
    21.     private Button button;
    22.  
    23.     @Override
    24.     protected void onCreate(Bundle savedInstanceState) {
    25.         super.onCreate(savedInstanceState);
    26.         setContentView(R.layout.activity_date_picker);
    27.         findViewById(R.id.btn_ok).setOnClickListener(this);
    28.         dp_date1 = findViewById(R.id.dp_date1);
    29.         dp_date2 = findViewById(R.id.dp_date2);
    30.         viewById = findViewById(R.id.tv_date);
    31.         button = findViewById(R.id.btn_date);
    32.  
    33.         button.setOnClickListener(this);
    34.     }
    35.  
    36.     @Override
    37.     public void onClick(View v) {
    38.         if (v.getId() == R.id.btn_ok) {
    39.             //月份 是0开始 所以加一
    40.             String desc = String.format("您选择的日期是 %d年%d月%d日", dp_date1.getYear(), dp_date1.getMonth() + 1, dp_date1.getDayOfMonth()) + "\n";
    41.             String desc2 = String.format("您选择的日期是 %d年%d月%d日", dp_date2.getYear(), dp_date2.getMonth() + 1, dp_date2.getDayOfMonth());
    42.             String result = desc + desc2;
    43.  
    44.             viewById.setText(result);
    45.  
    46.  
    47.         } else {
    48.             //获取日历的一个实例 ，里面包含了当前的年月日
    49.             Calendar instance = Calendar.getInstance();
    50.             int year = instance.get(Calendar.YEAR);
    51.             int month = instance.get(Calendar.MONTH);
    52.             int day = instance.get(Calendar.DATE);
    53.             //不用减1
    54.             DatePickerDialog datePickerDialog = new DatePickerDialog(this, this, year, month, day);
    55.             //显示日期对话框
    56.             datePickerDialog.show();
    57.  
    58.         }
    59.  
    60.  
    61.     }
    62.  
    63.     @Override
    64.     public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
    65.         String result = String.format("您选择的日期是 %d年%d月%d日", year, month + 1, dayOfMonth);
    66.         viewById.setText(result);
    67.     }
    68. }
    1. "1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     android:orientation="vertical"
    8.     android:padding="5dp"
    9.     tools:context=".DatePickerActivity">
    10.  
    11.     <ScrollView
    12.         android:layout_width="match_parent"
    13.         android:layout_height="wrap_content">
    14.  
    15.         <LinearLayout
    16.             android:layout_width="match_parent"
    17.             android:layout_height="wrap_content"
    18.             android:orientation="vertical">
    19.  
    20.             <DatePicker
    21.                 android:id="@+id/dp_date1"
    22.                 android:layout_width="match_parent"
    23.                 android:layout_height="wrap_content"
    24.                 android:calendarViewShown="false"
    25.                 android:datePickerMode="spinner" />
    26.  
    27.             <LinearLayout
    28.                 android:layout_width="match_parent"
    29.                 android:layout_height="wrap_content"
    30.                 android:gravity="center">
    31.  
    32.                 <DatePicker
    33.                     android:id="@+id/dp_date2"
    34.                     android:layout_width="wrap_content"
    35.                     android:layout_height="wrap_content"
    36.                     android:datePickerMode="calendar" />
    37.             LinearLayout>
    38.  
    39.             <Button
    40.                 android:id="@+id/btn_ok"
    41.                 android:layout_width="match_parent"
    42.                 android:layout_height="wrap_content"
    43.                 android:text="确定" />
    44.  
    45.  
    46.             <TextView
    47.                 android:id="@+id/tv_date"
    48.                 android:layout_width="match_parent"
    49.                 android:layout_height="wrap_content" />
    50.  
    51.  
    52.             <Button
    53.                 android:id="@+id/btn_date"
    54.                 android:layout_width="match_parent"
    55.                 android:layout_height="wrap_content"
    56.                 android:text="弹出日期对话框" />
    57.  
    58.  
    59.         LinearLayout>
    60.  
    61.  
    62.     ScrollView>
    63.  
    64.  
    65. LinearLayout>

    TimePicker&TimePickerDialog

    TimePicker 有两种 clock  spinner

    1. "1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     android:orientation="vertical"
    8.     tools:context=".TimePickerActivity">
    9.  
    10.  
    11.     <Button
    12.         android:id="@+id/btn_time"
    13.         android:layout_width="match_parent"
    14.         android:layout_height="wrap_content"
    15.         android:text="请选择时间" />
    16.  
    17.     <TimePicker
    18.         android:id="@+id/tp_date"
    19.         android:layout_width="match_parent"
    20.         android:layout_height="wrap_content"
    21.         android:timePickerMode="spinner" />
    22.  
    23.  
    24.     <TextView
    25.         android:id="@+id/tv_date"
    26.         android:layout_width="match_parent"
    27.         android:layout_height="wrap_content" />
    28.     <Button
    29.         android:id="@+id/btn_d"
    30.         android:layout_width="match_parent"
    31.         android:layout_height="wrap_content"
    32.         android:text="时间对话框" />
    33.  
    34. LinearLayout>
    1. package com.tiger.chapter05;
    2.  
    3. import androidx.appcompat.app.AppCompatActivity;
    4.  
    5. import android.app.AlertDialog;
    6. import android.app.TimePickerDialog;
    7. import android.os.Bundle;
    8. import android.view.View;
    9. import android.widget.TextView;
    10. import android.widget.TimePicker;
    11.  
    12. public class TimePickerActivity extends AppCompatActivity implements View.OnClickListener, TimePickerDialog.OnTimeSetListener {
    13.  
    14.     private TimePicker timePicker;
    15.     private TextView textView;
    16.  
    17.     @Override
    18.     protected void onCreate(Bundle savedInstanceState) {
    19.         super.onCreate(savedInstanceState);
    20.         setContentView(R.layout.activity_time_picker);
    21.  
    22.         findViewById(R.id.btn_time).setOnClickListener(this);
    23.         findViewById(R.id.btn_d).setOnClickListener(this);
    24.         timePicker = findViewById(R.id.tp_date);
    25.         timePicker.setIs24HourView(true);
    26.         textView = findViewById(R.id.tv_date);
    27.     }
    28.  
    29.  
    30.     @Override
    31.     public void onClick(View v) {
    32.             if (v.getId() ==R.id.btn_time ){
    33.                 String desc2 = String.format("您选择的时间是 %d:%d", timePicker.getHour(), timePicker.getMinute() );
    34.                 textView.setText(desc2);
    35.             }else {
    36.                 //构建一个时间对话框，该对话框已经集成了时间选择器
    37.                 TimePickerDialog timePickerDialog = new TimePickerDialog(this, AlertDialog.THEME_HOLO_LIGHT,this, 21, 12, true);
    38.                 timePickerDialog.show();
    39.             }
    40.     }
    41.  
    42.     @Override
    43.     public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
    44.         String desc2 = String.format("您选择的时间是 %d:%d", hourOfDay, minute );
    45.         textView.setText(desc2);
    46.     }
    47. }

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  • 原文地址：https://blog.csdn.net/qq_53374893/article/details/136456908