안드로이드 프로그래밍 제 7장 연습문제 (4, 5, 6번)

4번 ) 옵션 메뉴를 선택하면 동물의 사진이 바뀌는 프로젝트 만들기

 

 

activity_main.xml Code

 

<?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"
    android:padding="10dp"
    android:gravity="center_horizontal">

    <ImageView
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:scaleType="fitCenter"
        android:layout_margin="30dp"
        android:id="@+id/img1"/>

</LinearLayout>

 

Java Code

 

public class MainActivity extends AppCompatActivity {
    ImageView img;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("연습하기");
        img = (ImageView)findViewById(R.id.img1);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        menu.add(0,1,0,"고양이");
        menu.add(0,2,0,"라이언");
        menu.add(0,3,0,"토끼");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch(item.getItemId()){
            case 1:
                img.setImageResource(R.drawable.cat);
                return true;
            case 2:
                img.setImageResource(R.drawable.lion);
                return true;
            case 3:
                img.setImageResource(R.drawable.rabbit);
                return true;
        }
        return false;
    }

}

 

5번 ) 버튼을 클릭하면 임의의 위치에 이미지가 들어간 토스트가 나오는 프로젝트 만들기

 

 

activity_main.xml Code

 

<?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"
    android:padding="10dp"
    android:gravity="center">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="토스트 보이기"
        android:id="@+id/btn1"/>

</LinearLayout>

 

Java Code

 

public class MainActivity extends AppCompatActivity {
    Button btn;
    View toastView;

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

        btn = (Button)findViewById(R.id.btn1);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast toast = new Toast(MainActivity.this);
                toastView = (View)View.inflate(MainActivity.this,R.layout.toast1, null);
                toast.setView(toastView);
                int offsetX = (int)(Math.random()*800) - 400;
                int offsetY = (int)(Math.random()*800) - 400;
                toast.setGravity(Gravity.NO_GRAVITY, offsetX, offsetY);
                toast.show();
            }
        });
    }

}

 

6번 ) 초기화면에 라디오버튼으로 네 가지 동물 이름을 선택할 수 있고, <그림보기> 를 클릭하면 그림이 대화상자로 나오는 프로젝트 만들기

 

 

activity_main.xml Code

 

<?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"
    android:padding="10dp">

    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:id="@+id/rGroup1">

        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="고양이"
            android:id="@+id/rbtn1"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="라이언"
            android:id="@+id/rbtn2"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="토끼"
            android:id="@+id/rbtn3"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="강아지"
            android:id="@+id/rbtn4"/>

    </RadioGroup>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="그림보기"
        android:layout_margin="10dp"
        android:id="@+id/btn1"/>

</LinearLayout>

 

Dialog1.xml Code

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal">

    <ImageView
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:scaleType="fitCenter"
        android:id="@+id/img1"/>

</LinearLayout>

 

Java Code

 

public class MainActivity extends AppCompatActivity {
    RadioGroup rGroup;
    RadioButton rbtn1, rbtn2, rbtn3, rbtn4;
    Button btn, closeBtn;
    View dialogView;
    ImageView img;

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

        rGroup = (RadioGroup)findViewById(R.id.rGroup1);
        rbtn1 = (RadioButton)findViewById(R.id.rbtn1);
        rbtn2 = (RadioButton)findViewById(R.id.rbtn2);
        rbtn3 = (RadioButton)findViewById(R.id.rbtn3);
        rbtn4 = (RadioButton)findViewById(R.id.rbtn4);
        btn = (Button)findViewById(R.id.btn1);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dialogView = (View)View.inflate(MainActivity.this, R.layout.dialog1, null);
                AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this);
                String title = "";
                int src = 0;
                switch(rGroup.getCheckedRadioButtonId()){
                    case R.id.rbtn1:
                        title = "고양이";
                        src = R.drawable.cat;
                        break;
                    case R.id.rbtn2:
                        title = "라이언";
                        src = R.drawable.lion;
                        break;
                    case R.id.rbtn3:
                        title = "토끼";
                        src = R.drawable.rabbit;
                        break;
                    case R.id.rbtn4:
                        title = "강아지";
                        src = R.drawable.dog;
                        break;
                }
                dlg.setTitle(title);
                dlg.setView(dialogView);
                img = (ImageView)dialogView.findViewById(R.id.img1);
                img.setImageResource(src);
                dlg.setPositiveButton("닫기", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Toast.makeText(getApplicationContext(),"화면을 닫습니다.",Toast.LENGTH_SHORT).show();
                    }
                });
                dlg.show();
            }
        });
    }

}