단순 텍스트 로그용 액티비티

Log_Activity.java

package com.abyser.activity;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.View;
import android.widget.Button;
import android.widget.ScrollView;
import android.widget.TextView;

import com.abyser.R;

import java.text.SimpleDateFormat;

/**
 * <pre>
 * 텍스트 결과 출력 액티비티. 
 * </pre>
 * Created by abyser on 2017-11-23.
 */

public class Log_Activity extends Activity {

    private static final String LOG_TAG = "Log_Activity";

    private ScrollView sv_log;
    private TextView tv_log;
    private Button btn_log;

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

        initLayout();

    }

    private void initLayout() {

        sv_log = (ScrollView) findViewById(R.id.log_sv_log);
        tv_log = (TextView) findViewById(R.id.log_tv_log);
        btn_log = (Button) findViewById(R.id.log_btn);
        btn_log.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                try {

                    // TODO 이벤트
                    
                } catch (Exception e) {
                    e.printStackTrace();
                }

            }

        });

    }

    public void setLog(String msg) {

        String origin_msg = "";

        if (tv_log.getText().toString() != null && tv_log.getText().toString().length() > 0) {
            origin_msg = tv_log.getText().toString();
        }

        String time = new SimpleDateFormat("HH:mm:ss").format(System.currentTimeMillis());

        if (msg == null || msg.length() <= 0) {
            tv_log.setText(origin_msg + "\n" + time + " : empty");
        } else {
            tv_log.setText(origin_msg + "\n" + time + " : " + msg);
        }

        sv_log.fullScroll(ScrollView.FOCUS_DOWN);

    }

}

activity_log.xml

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

    <ScrollView
        android:id="@+id/log_sv_log"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <TextView
                android:id="@+id/log_tv_log"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:text="this is log textview"
                android:textSize="15dp" />
        </LinearLayout>
    </ScrollView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">

        <Button
            android:id="@+id/log_btn"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </LinearLayout>

</LinearLayout>