[Android] 3rd Class

2017.06.09

3rd Class

* 상수로 선언 해주는 법 : final

* 안드로이드 스튜디오 예제 : https://codelabs.developers.google.com/

* 코드로 레이아웃 생성시 intent를 조정해줘야 한다.

- app-manifests 가서 해당 클래스 명 뒤 액티비티에 intent-filter를 옮겨줘야 한다.

<은비 >

package com.oneplus.admin9.class0609;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    Button btnRemove;
    Button btnLeft;
    Button btnRight;
    ImageView img;
    int cnt = 0;
    int[] imgs = {R.drawable.cat, R.drawable.cat2, R.drawable.cat3, R.drawable.cat4, R.drawable.cat5}; //이미지가 많을 경우가 있어서 배열에 넣어 두는게 좋다. R파일 안에 16진수로 들어 있어서 int로 선언한거다.

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


        btnRemove = (Button) findViewById(R.id.btnRemove);
        btnLeft = (Button) findViewById(R.id.btnLeft);
        btnRight = (Button) findViewById(R.id.btnRight);
        img = (ImageView) findViewById(R.id.img);


        btnRemove.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (((Button) v).getText().equals("REMOVE")) {
                    img.setVisibility(View.INVISIBLE);
                    ((Button) v).setText("SHOW");
                } else {
                    img.setVisibility(View.VISIBLE);
                    ((Button) v).setText("REMOVE");
                }
            }
        });

        btnLeft.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                if (cnt == imgs.length - 1) {
                    Toast.makeText(getApplicationContext(), "사진없음", Toast.LENGTH_SHORT).show(); //getApplicationContext() 현재 화면 정보를 넘기는 메소드
                    cnt = 4;
                } else {
                    img.setImageResource(imgs[++cnt]);
                }


            }
        });
        btnRight.setOnClickListener(new View.OnClickListener()

        {
            @Override
            public void onClick(View v) {
                if (cnt == -1) {
                    Toast.makeText(getApplicationContext(), "사진없음", Toast.LENGTH_SHORT).show(); //getApplicationContext() 현재 화면 정보를 넘기는 메소드
                    cnt = 0;
                } else {
                    img.setImageResource(imgs[--cnt]);
                }


            }
        });
    }


//    private class ChangeImage {
//        public void invoke() {
//            if (cnt == 0) {
//                img.setImageResource(R.drawable.cat);
//            } else if (cnt == 1) {
//                img.setImageResource(R.drawable.cat2);
//            } else if (cnt == 2) {
//                img.setImageResource(R.drawable.cat3);
//            } else if (cnt == 3) {
//                img.setImageResource(R.drawable.cat4);
//            } else if (cnt == 4) {
//                img.setImageResource(R.drawable.cat5);
//            } else if (cnt > 4) {
//                cnt = 0;
//                img.setImageResource(R.drawable.cat);
//            } else if (cnt < 0) {
//                cnt = 4;
//                img.setImageResource(R.drawable.cat5);
//            }
//        }
//    }
}

<준영>

package com.oneplus.admin9.class0608_park;

import android.content.res.Resources;
import android.graphics.Color;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;


public class JavaLayoutActivity extends AppCompatActivity {

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

        //RelativeLayout myLayout = getGenerateLayout(); //메소드로 빼주기 ctrl + alt + m

        setContentView(getGenerateLayout());
        //이대로 실행하면 전에 것이 run된다. 그래서 app-manifests 가서 intent-filter를 옮겨줘야 한다.

        findViewById(R.id.myButtonId).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                EditText et = (EditText) findViewById(R.id.myEditTextId);
                et.setText("");
            }
        });

    }

    @NonNull
    private RelativeLayout getGenerateLayout() {
        Button myButton = new Button(this);
        myButton.setText("Press Me");
        myButton.setBackgroundColor(Color.YELLOW);
        myButton.setTransformationMethod(null);

        RelativeLayout myLayout = new RelativeLayout(this);
        myLayout.setBackgroundColor(Color.WHITE);
        EditText myEditText = new EditText(this);

        myButton.setId(R.id.myButtonId);
        myEditText.setId(R.id.myEditTextId);

        RelativeLayout.LayoutParams buttonParams = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        RelativeLayout.LayoutParams textParams = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

        textParams.addRule(RelativeLayout.ABOVE, myButton.getId());
        textParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
        textParams.setMargins(0, 0, 0, 20);

        Resources r = getResources();
        int px = (int) TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, 300, r.getDisplayMetrics());
        myEditText.setWidth(px);


        buttonParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
        buttonParams.addRule(RelativeLayout.CENTER_VERTICAL);


        myLayout.addView(myButton, buttonParams);
        myLayout.addView(myEditText, textParams);
        return myLayout;
    }
}