App基本界面组件案例

       今天的收获颇大呀，我发现了一个更高效快速的学习方法，如果真的是因为学习内容太多，无从下手的话，不妨去别人或者自己崇拜的大佬里的博客园里面转一转，你就会有意外的收获，不仅给你学习的压力，还更直观的给介绍了学习的方向和重点，这真的是捷径，我们要学会观看别人的博客园，从里面找到重点，获得收获。像一些零散的知识点里面都罗列的特别的详细，大佬就是大佬，总有我们崇拜的理由。在一位大佬的博客园里我看到了几个有趣的简易的app，感觉很有趣，就学习了一下。下面的内容我就是学习大佬之精华：

并且为了保存和加强对GitHub的学习，并且把一下代码上传到了GitHub上面，命名（playtest_married)：

婚姻建议程序:

   一：单选框按钮样例(RadioGroup和RadioButton建立单选框按钮)

strings.xml:

<resources>
    <string name="app_name">婚姻建议程序app</string>
    <string name="sex">性别</string>
    <string name="age">年龄</string>
    <string name="btn_ok">确定</string>
    <string name="result">建议：</string>
    <string name="not_hurry">青春还很富裕，先奋斗，结婚还不急！</string>
    <string name="find_couple">时候到了，可以尝试找个对象了！</string>
    <string name="get_married">你已经事业有成了，该结婚了！</string>
    <string name="boy">男生</string>
    <string name="gril">女生</string>
    <string name="boy_age_1">小于25岁</string>
    <string name="boy_age_2">25岁到30岁</string>
    <string name="boy_age_3">大于30岁</string>
    <string name="gril_age_1">小于25岁</string>
    <string name="gril_age_2">25岁到30岁</string>
    <string name="gril_age_3">大于30岁</string>
</resources>

activity_main.xml:

<?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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/sex"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/sex"
        android:textSize="25sp" />
    <RadioGroup
        android:id="@+id/radgrpsex"
        android:checkedButton="@+id/radbtnboy"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">
         <RadioButton
             android:id="@+id/radbtnboy"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:textSize="20sp"
             android:text="@string/boy"/>
        <RadioButton
              android:id="@+id/radbtngril"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:textSize="20sp"
              android:text="@string/gril"/>
    </RadioGroup>
    <TextView
        android:id="@+id/age"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/age"
        android:textSize="25sp"/>

        <RadioGroup
            android:id="@+id/radgrpage"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:checkedButton="@+id/radbtnage1">

            <RadioButton
                android:id="@+id/radbtnage1"
                android:textSize="20sp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/boy_age_1"/>
           <RadioButton
               android:id="@+id/radbtnage2"
               android:textSize="20sp"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="@string/boy_age_2"/>
          <RadioButton
                android:id="@+id/radbtnage3"
                android:textSize="20sp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/boy_age_3"/>
        </RadioGroup>
    <Button
        android:id="@+id/btn_ok"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:background="#4CAF50"
        android:text="@string/btn_ok"/>
    <TextView
        android:id="@+id/txtresult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/result"
        android:textSize="25sp"/>

</LinearLayout>

MainActivity.java:

package com.example.playtest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private Button mbtnok;
    private TextView mtxtr;
    private RadioGroup mradgrpsex,mradgrpage;
    private RadioButton mradbtnage1,mradbtnage2,mradbtnage3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mbtnok=(Button)findViewById(R.id.btn_ok);
        mbtnok.setOnClickListener(btnokOnClick);
        mtxtr=(TextView)findViewById(R.id.txtresult);
        mradgrpage=(RadioGroup)findViewById(R.id.radgrpage);
        mradgrpsex=(RadioGroup)findViewById(R.id.radgrpsex);
        mradbtnage1=(RadioButton) findViewById(R.id.radbtnage1);
        mradbtnage2=(RadioButton) findViewById(R.id.radbtnage2);
        mradbtnage3=(RadioButton) findViewById(R.id.radbtnage3);

        mradgrpsex.setOnCheckedChangeListener(radgrpsexOnClickedChange);
    }

    private View.OnClickListener btnokOnClick=new View.OnClickListener(){
        @Override
        public void onClick(View v){
            String strres=getString(R.string.result);

            switch(mradgrpage.getCheckedRadioButtonId()){
                case R.id.radbtnage1:
                    strres+=getString(R.string.not_hurry);break;
                case R.id.radbtnage2:
                    strres+=getString(R.string.find_couple);break;
                case R.id.radbtnage3:
                    strres+=getString(R.string.get_married);break;
            }
            mtxtr.setText(strres);
        }
    };

    private RadioGroup.OnCheckedChangeListener radgrpsexOnClickedChange=new RadioGroup.OnCheckedChangeListener(){
        @Override
        public void onCheckedChanged(RadioGroup group,int checkedid){
            if(checkedid==R.id.radbtnboy){
                mradbtnage1.setText(getString(R.string.boy_age_1));
                mradbtnage2.setText(getString(R.string.boy_age_2));
                mradbtnage3.setText(getString(R.string.boy_age_3));
            }
            else{
                mradbtnage1.setText(getString(R.string.gril_age_1));
                mradbtnage2.setText(getString(R.string.gril_age_2));
                mradbtnage3.setText(getString(R.string.gril_age_3));
            }
        }
    };
}

运行结果显示：

 二：下拉框（Spinner）和数字转轮（NumberPicker）的使用

这个是在上面的婚姻建议程序app的基础上改的，将其换成了下拉框和数字转轮的形式

 strings.xml:

<resources>
    <string name="app_name">婚姻建议程序app</string>
    <string name="sex">性别</string>
    <string name="age">年龄</string>
    <string name="btn_ok">确定</string>
    <string name="result">建议：</string>
    <string name="not_hurry">青春还很富裕，先奋斗，结婚还不急！</string>
    <string name="find_couple">时候到了，可以尝试找个对象了！</string>
    <string name="get_married">你已经事业有成了，该结婚了！</string>
    <string name="boy">男生</string>
   <string-array name="sex_list">
       <item>男生</item>
       <item>女生</item>
   </string-array>
    <string name="sex_select">请选择性别：</string>
    <string name="boy_age_1">小于25岁</string>
    <string name="boy_age_2">25岁到30岁</string>
    <string name="boy_age_3">大于30岁</string>
    <string name="gril_age_1">小于25岁</string>
    <string name="gril_age_2">25岁到30岁</string>
    <string name="gril_age_3">大于30岁</string>
</resources>

activity_main.xml:

<?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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/sex"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/sex"
        android:textSize="25sp" />
    <Spinner
        android:id="@+id/spnsex"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/sex_list"
        android:spinnerMode="dialog"
        android:prompt="@string/sex_select"/>
    <TextView
        android:id="@+id/age"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/age"
        android:textSize="25sp"/>
    <TextView
        android:id="@+id/txtage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="25sp"/>
    <NumberPicker
        android:id="@+id/numage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"/>

    <Button
        android:id="@+id/btn_ok"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:background="#4CAF50"
        android:text="@string/btn_ok"/>
    <TextView
        android:id="@+id/txtresult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/result"
        android:textSize="25sp"/>

</LinearLayout>

MainActivity.java:

package com.example.playtest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.NumberPicker;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private NumberPicker numage;
    private Spinner spsex;
    private Button mbtnok;
    private TextView mtxtresult,mtxtage;
    private String strsex;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mtxtage=(TextView)findViewById(R.id.txtage);
        mtxtage.setText("25");

        numage=(NumberPicker)findViewById((R.id.numage));
        numage.setMinValue(0);
        numage.setMaxValue(100);
        numage.setValue(25);
        numage.setOnValueChangedListener(numChange);

        mbtnok=(Button)findViewById(R.id.btn_ok);
        mbtnok.setOnClickListener(btnonClick);

        mtxtresult=(TextView)findViewById(R.id.txtresult);
        spsex=(Spinner)findViewById(R.id.spnsex);
        spsex.setOnItemSelectedListener(spsexOnItemSelected);
    }

    private View.OnClickListener btnonClick=new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int age=numage.getValue();
            String strresult=getString(R.string.result);

            if(age<25)
                strresult+=getString(R.string.not_hurry);
            else if(age>30)
                strresult+=getString(R.string.get_married);
            else
                strresult+=getString(R.string.find_couple);
            mtxtresult.setText(strresult);
        }
    };

    private AdapterView.OnItemSelectedListener spsexOnItemSelected=new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            strsex=parent.getSelectedItem().toString();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    };

    private NumberPicker.OnValueChangeListener numChange=new NumberPicker.OnValueChangeListener() {
        @Override
        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
            mtxtage.setText(String.valueOf(newVal));
        }
    };
}

运行结果：