안드로이드 java 소스를 통한 layout 구성해보기

Main_Activity.class

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

        ViewGroup layout = findViewById(R.id.container);

        String message = "Java 소스를 통한 화면 구성";

        TextView tv = new TextView(this);
        tv.setTextSize(20);
        tv.setText(message);

        Button btn = new Button(this);
        btn.setText("토스트 띄우기");
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "뷰 화면 띄우기", Toast.LENGTH_SHORT).show();
            }
        });

        DisplayMetrics metrics = getResources().getDisplayMetrics();
        int widthPixels = metrics.widthPixels * 1;
        int heightPixels = widthPixels * 1;

        LinearLayout linearLayout = new LinearLayout(this);
        linearLayout.setBackgroundResource(R.color.teal_200);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(widthPixels,heightPixels);
        linearLayout.setLayoutParams(params);

        Button tBtn = new Button(this);
        tBtn.setText("Java 소스로 만들어진 레이아웃의 차일드");
        // tBtn.setBackgroundColor(Color.WHITE);

        layout.addView(tv);
        layout.addView(btn);
        layout.addView(linearLayout);
        linearLayout.addView(tBtn);

    }
}

 

 

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:background="#FFFFFF"
    android:orientation="vertical"
    tools:context=".MainActivity"
    android:id="@+id/container"
    >

</LinearLayout>