Open in app

Sign in

Write

Sign in

用JAVA寫的安卓筆記2

黃滋滋
39 min readOct 31, 2020

--

就是筆記~

被操作要有ID命名

按紐=toggleButton

常用switch

黃色!可以~ 紅色!不行因為代表錯誤

要確認4邊至少要有一邊有綁

按紐=Button (沒有綁ID)

程式碼新增:

package com.huang.myapp01;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

宣告變數

input=findViewById(R.id.input)

找到(R.id.input)傳到input

初始化元件

package com.huang.myapp01;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.ToggleButton;

public class MainActivity extends AppCompatActivity {

    EditText input;
    ToggleButton toggleButton;
    Switch switch1;


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

        input=findViewById(R.id.input);
        toggleButton=findViewById(R.id.toggleButton);
        switch1=findViewById(R.id. switch1);
    }

    public void onClick(View view){

    }
}

賦予功能:toggleButton.setOnCheckedChangeListener();

把元件附上設定:檢查是否改變,當被改變要在()裡面填去執行

打new Com可以選

但是舊版的長的不同..要用手改public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

package com.huang.myapp01;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.ToggleButton;

public class MainActivity extends AppCompatActivity {

    EditText input;
    ToggleButton toggleButton;
    Switch switch1;


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

        input=findViewById(R.id.input);
        toggleButton=findViewById(R.id.toggleButton);
        switch1=findViewById(R.id. switch1);

toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

    }
});

    }

    public void onClick(View view){

    }
}

放入if…else

畫面短暫出現的原件Toast

if(isChecked){
    Toast.makeText().show();
}
else{}

在這個頁面顯示

f(isChecked){
    Toast.makeText(MainActivity.this,"OK",Toast.LENGTH_SHORT).show();
}
else{}
else{}裡面也寫

沒有出現錯誤

package com.huang.myapp01;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.Toast;
import android.widget.ToggleButton;

public class MainActivity extends AppCompatActivity {

    EditText input;
    ToggleButton toggleButton;
    Switch switch1;

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

        input = findViewById(R.id.input);
        toggleButton = findViewById(R.id.toggleButton);
        switch1 = findViewById(R.id.switch1);
        //toggleButton賦予功能
        toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
                }
                else{
                    Toast.makeText(MainActivity.this, "NO", Toast.LENGTH_SHORT).show();
                }
            }
        });
        //switch1賦予功能
        switch1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
                }
                else{
                    Toast.makeText(MainActivity.this, "NO", Toast.LENGTH_SHORT).show();
                }
            }
        });

    }

    public void onClick(View view) {
    }
}

但是我按模擬器下面一直顯示E/eglCodecCommon: glUtilsParamSize: unknow param 0x000082da
glUtilsParamSize: unknow param 0x000082da

似乎就是要連真的手機

Android 學習筆記 glUtilsParamSize: unknow param ...

在 Android 放 WebView 時，利用 AVD 跑 app 時一直出現類似這樣的 log: 02-12 18:07:53.976 7739-7808/today.winwu.blog.demoApp…

yiyingloveart.blogspot.com

有時是模擬器卡住~要看下面有沒有跑出來~

沒有V有GPU功能的模擬器是方形的

Toast跳太快截不到圖

package com.huang.myapp01;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.Toast;
import android.widget.ToggleButton;
public class MainActivity extends AppCompatActivity {
    //宣告變數
    EditText input;
    ToggleButton toggleButton;
    Switch switch1;
    String str1, str2, str3;

    //初始化元件
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        input = findViewById(R.id.input);
        toggleButton = findViewById(R.id.toggleButton);
        switch1 = findViewById(R.id.switch1);
        //toggleButton賦予功能
        toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
                    str1 = "toggleButton-->OK";
                }
                else{
                    Toast.makeText(MainActivity.this, "NO", Toast.LENGTH_SHORT).show();
                    str1 = "toggleButton-->NO";
                }
            }
        });
        //switch1賦予功能
        switch1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
                    str2 = "switch1-->OK";
                }
                else{
                    Toast.makeText(MainActivity.this, "NO", Toast.LENGTH_SHORT).show();
                    str2 = "switch1-->OK";
                }
            }
        });
    }
    //透過 button 收集全部的資料
    public void onClick(View view) {
        str3 = input.getText().toString();
        Toast.makeText(MainActivity.this,
                str1+"\n"+str2+"\n"+str3,
                Toast.LENGTH_LONG).show();
    }
}
package com.huang.myapp01;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.Toast;
import android.widget.ToggleButton;
public class MainActivity extends AppCompatActivity {
    //宣告變數
    EditText input;
    ToggleButton toggleButton;
    Switch switch1;
    String str1, str2, str3;

    //初始化元件
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        input = findViewById(R.id.input);
        input.setText("NO INPUT");
        str1 = "toggleButton-->NO";
        str2 = "switch1-->NO";
        str3 = input.getText().toString();

        toggleButton = findViewById(R.id.toggleButton);
        switch1 = findViewById(R.id.switch1);
        //toggleButton賦予功能
        toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
                    str1 = "toggleButton-->OK";
                }
                else{
                    Toast.makeText(MainActivity.this, "NO", Toast.LENGTH_SHORT).show();
                    str1 = "toggleButton-->NO";
                }
            }
        });
        //switch1賦予功能
        switch1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    Toast.makeText(MainActivity.this, "OK", Toast.LENGTH_SHORT).show();
                    str2 = "switch1-->OK";
                }
                else{
                    Toast.makeText(MainActivity.this, "NO", Toast.LENGTH_SHORT).show();
                    str2 = "switch1-->OK";
                }
            }
        });
    }
    //透過 button 收集全部的資料
    public void onClick(View view) {
        str3 = input.getText().toString();
        Toast.makeText(MainActivity.this,
                str1+"\n"+str2+"\n"+str3,
                Toast.LENGTH_LONG).show();
    }
}

但是…發現…我的模擬器..原來建的”請輸入姓名”的地方會不見
還是我要把他往下移

可能畫面過長, 可改變對上的距離

NAME的地方還會被疊到

用完要用close關掉才不會佔記憶體

另一個~專案開始-單選RadioButton+複選CheckBox

開工~

Group先做再做button

button一定會縮排-要有2個選項要選2個button

Compontaint Tree預設是由上往下排

要橫的排要放入Layouts

要記得綁定

放checkBox

Layouts不好調-按紐和字都會跑入~要靠移動旁邊的tree

或許調程式碼還比較快

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="36dp"
        android:text="調查表"
        android:textSize="36sp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView">

        <RadioButton
            android:id="@+id/radioButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="RadioButton" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="RadioButton" />
    </RadioGroup>

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="409dp"
        android:layout_height="139dp"
        android:layout_marginTop="36dp"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup">

        <CheckBox
            android:id="@+id/checkBox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="CheckBox" />

        <CheckBox
            android:id="@+id/checkBox2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="CheckBox" />

        <CheckBox
            android:id="@+id/checkBox3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="CheckBox" />
    </LinearLayout>

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="36dp"
        android:text="Button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/linearLayout2" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="36dp"
        android:text="TextView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

</androidx.constraintlayout.widget.ConstraintLayout>

要GROUP去管理...所以要有ID

button也重命名ID

如果text不能改就要從CODE去改

到onClick的orientation可以看到變橫的horizontal

讓linerlayout跟著副容器的大小

在Declared Attributs裡layout_wiudth和match_wiudth 選wrap_content或0dp

然後讓邊邊有留邊要選到padding

命名checkbox的變數

Button-onCilck可以動做

回到程式碼.java檔

package com.huang.myui3;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    public void onClick(View view){

    }
}

預先被V只能選一個

回到程式碼.java檔

從放入變數開始~

package com.huang.myui3;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    RadioGroup sex;
    CheckBox c1,c2,c3;
    TextView show;

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

    public void onClick(View view){

    }
}

顯示字串:String all=””;

就是顯示有人打的東西

package com.huang.myui3;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    RadioGroup sex;
    CheckBox c1,c2,c3;
    TextView show;
    String all="";


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

    public void onClick(View view){

    }
}

繼續寫.java程式碼=讓他去檢查誰被勾選

sex=findViewById(R.id.sex);
sex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(RadioGroup grroup, int checkedId) {
        
    }
});

新增變數String s1,s2;

逐一檢查:

package com.huang.myui3;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    RadioGroup sex;
    CheckBox c1,c2,c3;
    TextView show;
    String all="";
    String s1,s2;

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

        sex = findViewById(R.id.sex);
        sex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch(checkedId){
                    case R.id.r1:
                        s1 = "先生";
                        Toast.makeText(MainActivity.this,
                                s1,
                                Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.r2:
                        s1 = "女士";
                        Toast.makeText(MainActivity.this, s1, Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.r3:
                        s1 = "不顯示";
                        Toast.makeText(MainActivity.this, s1, Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        });

        //CheckBox
    }

    public void onClick(View view) {
    }
}

再來是各做各的CheckBox

c1=findViewById(R.id.c1);
c2=findViewById(R.id.c2);
c3=findViewById(R.id.c3);

加入偵聽器c1.setOnCheckedChangeListener(new MM());..看自己有沒有被V

都命名MM是制定的

c1.setOnCheckedChangeListener(new MM());
c2.setOnCheckedChangeListener(new MM());
c3.setOnCheckedChangeListener(new MM());

還有最下面的textview

package com.huang.myui3;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    RadioGroup sex;
    CheckBox c1,c2,c3;
    TextView show;
    String all="";
    String s1,s2;

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

        sex = findViewById(R.id.sex);
        sex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch(checkedId){
                    case R.id.r1:
                        s1 = "先生";
                        Toast.makeText(MainActivity.this,
                                s1,
                                Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.r2:
                        s1 = "女士";
                        Toast.makeText(MainActivity.this, s1, Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.r3:
                        s1 = "不顯示";
                        Toast.makeText(MainActivity.this, s1, Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        });

        //CheckBox
        c1=findViewById(R.id.c1);
        c2=findViewById(R.id.c2);
        c3=findViewById(R.id.c3);

        c1.setOnCheckedChangeListener(new MM());
        c2.setOnCheckedChangeListener(new MM());
        c3.setOnCheckedChangeListener(new MM());

        show=findViewById(R.id.show);
    }

    public void onClick(View view) {
    }
}

加入checkBOX偵聽器

要選下面的~因為是內部類-要往上搬

反紅的地方往前按燈泡/右鍵general/alt+insert也可以選implement

private class MM implements CompoundButton.OnCheckedChangeListener {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        
    }
}

要使用CheckBox相關的功能指令轉換

CheckBox box = (CheckBox)buttonView;

取出字面上的名稱

String name = box.getText().toString();

是被選到還是被取消

if(isChecked){
                Toast.makeText(MainActivity.this, name+"被選中", Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(MainActivity.this, name+"被取消", Toast.LENGTH_SHORT).show();
            }
        }
    }

按鈕蒐集資料顯示在show

public void onClick(View view) {


}

宣告物件被取出來

for(int i:cbs){
            //CheckBox cc = findViewById(i);
            cc = findViewById(i);
            if(cc.isChecked()){
                s2 += cc.getText()+"\t";
            }

偵聽器可以被改寫

//c1.setOnCheckedChangeListener(new MM());
//c2.setOnCheckedChangeListener(new MM());
//c3.setOnCheckedChangeListener(new MM());

改寫成

c1 = findViewById(R.id.c1);
c2 = findViewById(R.id.c2);
c3 = findViewById(R.id.c3);
package com.huang.myui3;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {
    //宣告變數
    RadioGroup sex;
    CheckBox c1, c2, c3;
    TextView show;
    String all="";
    String s1="先生", s2="沒有點選";

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

        //RadioGroup
        sex = findViewById(R.id.sex);
        sex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch(checkedId){
                    case R.id.r1:
                        s1 = "先生";
                        Toast.makeText(MainActivity.this, s1, Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.r2:
                        s1 = "女士";
                        Toast.makeText(MainActivity.this, s1, Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.r3:
                        s1 = "不顯示";
                        Toast.makeText(MainActivity.this, s1, Toast.LENGTH_SHORT).show();
                        break;
                }
            }
        });

        //CheckBox
        c1 = findViewById(R.id.c1);
        c2 = findViewById(R.id.c2);
        c3 = findViewById(R.id.c3);
        //c1.setOnCheckedChangeListener(new MM());
        //c2.setOnCheckedChangeListener(new MM());
        //c3.setOnCheckedChangeListener(new MM());

        show = findViewById(R.id.show);
    }
    //CheckBox的偵聽器:內部類
    private class MM implements CompoundButton.OnCheckedChangeListener {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            //判斷元件
            CheckBox box = (CheckBox)buttonView;
            //取出元件的名稱
            String name = box.getText().toString();
            //判斷點選狀態
            if(isChecked){
                Toast.makeText(MainActivity.this, name+"被選中", Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(MainActivity.this, name+"被取消", Toast.LENGTH_SHORT).show();
            }
        }
    }
    //按鈕收集資料,顯示在show
    public void onClick(View view) {

        //先清空s2
        s2 = "";
        //收集CheckBox的結果
        int[] cbs = {R.id.c1, R.id.c2, R.id.c3};
        CheckBox cc;
        for(int i:cbs){
            //CheckBox cc = findViewById(i);
            cc = findViewById(i);
            if(cc.isChecked()){
                s2 += cc.getText()+"\t";
            }
        }
        //判斷文字欄位是否為空
        //TextUtils需 import android.text.TextUtils;(舊版)
        if(TextUtils.isEmpty(s2)){
            s2 = "沒有點選";
        }
        all = s1+"\n"+s2;
        show.setText(all);
    }
}

--

--

黃滋滋
黃滋滋

Written by 黃滋滋

60 Followers
17 Following

表現我會寫程式的作品集-https://hackmd.io/@huangtzutzu others 讀書筆記-https://hackmd.io/@sSA6NW2ZToCxgSaVETWNCg KOTLIN讀書會筆記-https://huangtzutzu.wordpress.com/ 自己規劃進度跟作品

No responses yet

Help

Status

About

Careers

Press

Blog

Privacy

Terms

Text to speech

Teams