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2021 iThome 鐵人賽

DAY 8
0

上偏加入字串空的

String all ="";

這裡多了餐選的,飲料選的,全部選的

String mealString,drinkString,all ="";

現在長這樣~

package com.huang.myapplication8;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    //宣告變數
    EditText uName,uPhone,uNum;
    TextView uPrice;
    RadioGroup uMeal,uDrink;
    RadioButton m1,m2,m3,m4,d1,d2,d3;
    CheckBox memo1,memo2,memo3;

    String mealString,drinkString,all ="";

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

    public void onClick(View view) {
    }
}

開始做初始化-findViewById

https://ithelp.ithome.com.tw/upload/images/20220131/20119035lrqwFzrH2s.png

package com.huang.myapplication8;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    //宣告變數
    EditText uName,uPhone,uNum;
    TextView uPrice;
    RadioGroup uMeal,uDrink;
    RadioButton m1,m2,m3,m4,d1,d2,d3;
    CheckBox memo1,memo2,memo3;

    String mealString,drinkString,all ="";

    //初始化

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

        uName =findViewById(R.id.uName);
        uPhone =findViewById(R.id.uPhone);
        uNum =findViewById(R.id.uNum);
        uPrice =findViewById(R.id.uPrice);

        //uMeal


    }

    public void onClick(View view) {
    }
}

https://ithelp.ithome.com.tw/upload/images/20220131/20119035oAmHlpIJF4.png

//uMealt初始化

uMeal=findViewById(R.id.uMeal);

https://ithelp.ithome.com.tw/upload/images/20220131/20119035kHwvtFEKPW.png

加工能-偵測是否有改變setOnCheckedChangeListener-()裡面是物件

https://ithelp.ithome.com.tw/upload/images/20220131/20119035a3AzSKitZU.png

新增RadioGroup專用-單選

https://ithelp.ithome.com.tw/upload/images/20220131/201190358WUGALs6Oh.png

這裡看看-(RadioGroup radioGroup, int i)改成(RadioGroup group, int checkedId)會怎樣

//uMeal
        uMeal=findViewById(R.id.uMeal);
        uMeal.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton rb =findViewById(checkedId);
                mealString = rb.getText().toString();
                Toast.makeText(MainActivity.this,mealString,Toast.LENGTH_SHORT).show();

rb在這裡是準備操作的臨時變數-

再來看mealString是點到誰-->然後轉成字串

用toast測試.最後註解掉:
https://ithelp.ithome.com.tw/upload/images/20220131/20119035PWWJ6kna3j.png

package com.huang.myapplication8;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    //宣告變數
    EditText uName,uPhone,uNum;
    TextView uPrice;
    RadioGroup uMeal,uDrink;
    RadioButton m1,m2,m3,m4,d1,d2,d3;
    CheckBox memo1,memo2,memo3;

    String mealString,drinkString,all ="";

    //初始化

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

        uName =findViewById(R.id.uName);
        uPhone =findViewById(R.id.uPhone);
        uNum =findViewById(R.id.uNum);
        uPrice =findViewById(R.id.uPrice);

        //uMeal
        uMeal=findViewById(R.id.uMeal);
        uMeal.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton rb =findViewById(checkedId);
                mealString = rb.getText().toString();
                Toast.makeText(MainActivity.this,mealString,Toast.LENGTH_SHORT).show();


            }
        });



    }

    public void onClick(View view) {
    }
}

toast要用手機測試:
https://ithelp.ithome.com.tw/upload/images/20220131/2011903550C3hs1fga.jpg


這裡來寫uDrink要注意}

//uDrink
        uDrink=findViewById(R.id.uDrink);
        uDrink.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton rb =findViewById(checkedId);
                drinkString = rb.getText().toString();
                Toast.makeText(MainActivity.this,mealString,Toast.LENGTH_SHORT).show();

            }
        });

再來寫checkBox-初始化
https://ithelp.ithome.com.tw/upload/images/20220131/20119035KJWh5KFmNI.png

https://ithelp.ithome.com.tw/upload/images/20220131/20119035gpk7489ov3.png

package com.huang.myapplication8;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    //宣告變數
    EditText uName,uPhone,uNum;
    TextView uPrice;
    RadioGroup uMeal,uDrink;
    RadioButton m1,m2,m3,m4,d1,d2,d3;
    CheckBox memo1,memo2,memo3;

    String mealString,drinkString,all ="";

    //初始化

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

        uName =findViewById(R.id.uName);
        uPhone =findViewById(R.id.uPhone);
        uNum =findViewById(R.id.uNum);
        uPrice =findViewById(R.id.uPrice);

        //uMeal
        uMeal=findViewById(R.id.uMeal);
        uMeal.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton rb =findViewById(checkedId);
                mealString = rb.getText().toString();
                Toast.makeText(MainActivity.this,mealString,Toast.LENGTH_SHORT).show();


            }
        });

        //uDrink
        uDrink=findViewById(R.id.uDrink);
        uDrink.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton rb =findViewById(checkedId);
                drinkString = rb.getText().toString();
                Toast.makeText(MainActivity.this,mealString,Toast.LENGTH_SHORT).show();

            }
        });

        //checkBox
        memo1 =findViewById(R.id.memo1);
        memo2 =findViewById(R.id.memo2);
        memo3 =findViewById(R.id.memo3);

        

    }

    public void onClick(View view) {
    }
}

利用按鈕整合起來-收集資料並送到下一頁-一個一個字串string收集到下一頁

1-撰寫Andorid的時候,有時程式的功能會需要取得Button、TextView、EditText等等元件的內容,一般會認為getText()這個方法所回傳的類型是String,但是情況卻不是這樣,需要加上toString()的方法強制轉型為String

2-num數字欄位計算.但是如果是要字串轉數字就要用Integer.parseInt

public void onClick(View view) {
        //文字欄位的收集
        String name = uName.getText().toString();
        String phone = uPhone.getText().toString();
        int num = Integer.parseInt(uNum.getText().toString());

        
    }

再來是checkBox-用陣列選取一下
用for each的寫法
https://lakesd6531.pixnet.net/blog/post/342603565-java-for-each%E8%BF%B4%E5%9C%88%E7%9A%84%E7%94%A8%E6%B3%95

i依序取出R.id.memo1,R.id.memo2,R.id.memo3

字串空的=全部選的

String all ="";

https://ithelp.ithome.com.tw/upload/images/20220131/201190359s0ReTII2H.png

package com.huang.myapplication8;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    //宣告變數
    EditText uName,uPhone,uNum;
    TextView uPrice;
    RadioGroup uMeal,uDrink;
    RadioButton m1,m2,m3,m4,d1,d2,d3;
    CheckBox memo1,memo2,memo3;

    String mealString,drinkString,all ="";

    //初始化

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

        uName =findViewById(R.id.uName);
        uPhone =findViewById(R.id.uPhone);
        uNum =findViewById(R.id.uNum);
        uPrice =findViewById(R.id.uPrice);

        //uMeal
        uMeal=findViewById(R.id.uMeal);
        uMeal.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton rb =findViewById(checkedId);
                mealString = rb.getText().toString();
                Toast.makeText(MainActivity.this,mealString,Toast.LENGTH_SHORT).show();


            }
        });

        //uDrink
        uDrink=findViewById(R.id.uDrink);
        uDrink.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton rb =findViewById(checkedId);
                drinkString = rb.getText().toString();
                Toast.makeText(MainActivity.this,mealString,Toast.LENGTH_SHORT).show();

            }
        });

        //checkBox
        memo1 =findViewById(R.id.memo1);
        memo2 =findViewById(R.id.memo2);
        memo3 =findViewById(R.id.memo3);



    }

    //收集資料並送到下一頁

    public void onClick(View view) {
        //文字欄位的收集
        String name = uName.getText().toString();
        String phone = uPhone.getText().toString();
        int num = Integer.parseInt(uNum.getText().toString());

        //checkBox
        int[] cbs ={R.id.memo1,R.id.memo2,R.id.memo3};
        for(int i:cbs){
            CheckBox cc =findViewById(i);
            if(cc.isChecked()){
                all += cc.getText().toString()+"\t";
            }
        }

    }
}



xml+java檔就是activity就是活動畫面

再來是送到第2頁:Intent意圖 from->page2

https://ithelp.ithome.com.tw/upload/images/20220131/20119035p0jeLgHwSo.png

按app-->java--mainActivity第2頁的建立開始很像開新檔:要V--layout file

https://ithelp.ithome.com.tw/upload/images/20220131/20119035nVbGuqZAGG.png

等他初始化完成-java檔和layout檔案個多一個
https://ithelp.ithome.com.tw/upload/images/20220131/20119035FPf68cSYdZ.png

看到manifests-設定權限要求(打開相機之類的)-活動畫面的清冊

https://ithelp.ithome.com.tw/upload/images/20220131/201190354NaOtKFU10.png

裡面顯示一個APP可以看到多少頁面

https://ithelp.ithome.com.tw/upload/images/20220131/20119035gllNnFuiPT.png

<intent-filter的功能是:

1-指定-頁面
2-條件action

MAIN是指主要開始

<intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

繼續從 送到第2頁

https://ithelp.ithome.com.tw/upload/images/20220131/20119035PJIfPTYCZG.png

//送到第2頁
        Intent it = new Intent();//送貨員
        it.setClass(MainActivity.this,Page2.class);//送到哪裡去
        startActivity(it);//出發了

目前手動回到上一頁~


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