[7] SharedPreferences, Tutorial, Canvas 1,2

1. SharedPreferences

Sample Source

package com.ssh.user.ex_1207; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.TextView; public class PrefereActivity extends AppCompatActivity { Button btn_up, btn_down, btn_reset; TextView value; int num = 0; //값을 저장하기 위한 클래스 SharedPreferences pref; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_prefere); pref = PreferenceManager.getDefaultSharedPreferences( PrefereActivity.this ); // 저장되어 있는 값을 Load num = pref.getInt("save", 0); value = (TextView)findViewById(R.id.value); value.setText(String.valueOf(num)); btn_up = (Button)findViewById(R.id.btn_up); btn_down = (Button)findViewById(R.id.btn_down); btn_reset = (Button)findViewById(R.id.btn_reset); btn_up.setOnClickListener(click); btn_down.setOnClickListener(click); btn_reset.setOnClickListener(click); }//onCreate() View.OnClickListener click = new View.OnClickListener() { @Override public void onClick(View view) { switch(view.getId()) { case R.id.btn_up: num++; break; case R.id.btn_down: num--; break; case R.id.btn_reset: num = 0; break; } value.setText( String.valueOf(num) ); } }; @Override protected void onDestroy() { super.onDestroy(); //app이 완전히 종료될 때 num 값을 저장. SharedPreferences.Editor edit = pref.edit(); edit.putInt("save", num ); edit.commit(); } }

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_prefere" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.ssh.user.ex_1207.PrefereActivity" android:gravity="center" android:orientation="vertical"> <TextView android:id="@+id/value" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center" android:textSize="40dp" android:text="0"/> <Button android:id="@+id/btn_up" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="value++"/> <Button android:id="@+id/btn_down" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="value--"/> <Button android:id="@+id/btn_reset" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="reset"/> </LinearLayout>

2. Tutorial

Sample Sourece

package com.ssh.user.ex_1208; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.CheckBox; public class TutorialActivity extends AppCompatActivity { CheckBox check; Button start; SharedPreferences pref; boolean b; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_tutorial); pref = PreferenceManager.getDefaultSharedPreferences(TutorialActivity.this); b = pref.getBoolean("myTutorial", false); if(b == true) startActivityTutorial(); check = (CheckBox) findViewById(R.id.check); start = (Button) findViewById(R.id.start); start.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { //체크박스의 현재 상태를 저장 SharedPreferences.Editor edit = pref.edit(); edit.putBoolean("myTutorial", check.isChecked()); edit.commit(); startActivityTutorial(); } }); }//onCreate() //화면전환 메서드 private void startActivityTutorial() { Intent i = new Intent(TutorialActivity.this, MainActivity.class); i.setFlags( Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP); startActivity(i); finish(); } }

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_tutorial" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:background="#aaf" tools:context="com.ssh.user.ex_1208.TutorialActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textColor="#000" android:textSize="30dp" android:textStyle="italic" android:text="tutorlal" /> <CheckBox android:id="@+id/check" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Totorial 다시 보지 않기" android:layout_alignParentBottom="true" android:layout_alignParentRight="true"/> <Button android:id="@+id/start" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="start" android:layout_alignParentBottom="true"/> </RelativeLayout>

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.ssh.user.ex_1208.MainActivity"> <Button android:id="@+id/btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="tutorial"/> </RelativeLayout>

3. Canvas 1

Sample Source

package com.ssh.user.ex_1208; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class Canvas01Activity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView( new MyView(Canvas01Activity.this) ); } }

package com.ssh.user.ex_1208; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.view.View; /** * Created by USER on 2016-12-08. */ public class MyView extends View{ public MyView(Context context) { super(context); } // View에서는 onDraw에서 작업한내용만 적용 // 화면에 그림을 갱신하는 메서드 @Override protected void onDraw(Canvas canvas) { // 그림을 그리기 위한 붓과 같은 객체 Paint paint = new Paint(); paint.setColor(Color.BLUE); //캔버스에 사각형 그리기. Rect rt = new Rect(); // top right // ______ // ㅣ____ㅣ // left bottom rt.set(100, 200, 300, 400); canvas.drawRect(rt, paint); //캔버스에 원 그리기. paint.setColor(Color.RED); canvas.drawCircle(200, 600, 100, paint); //테두리만 있는 색상의 원 paint.setStyle(Paint.Style.STROKE); canvas.drawCircle(400, 600, 100, paint); } }

4. Canvas 2

Sample Source

package com.ssh.user.ex_1208; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class Canvas02Activity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new MyView2(Canvas02Activity.this)); } }

package com.ssh.user.ex_1208; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.view.MotionEvent; import android.view.View; /** * Created by USER on 2016-12-08. */ public class MyView2 extends View { public MyView2(Context context) { super(context); } Paint paint = new Paint(); // Path : 화면에 그리기 위한 정보를 모아서 한번에 출력해 주는 클래스 Path path = new Path(); int x, y; @Override protected void onDraw(Canvas canvas) { paint.setColor(Color.GREEN); paint.setStrokeWidth( 3 ); paint.setStyle(Paint.Style.STROKE); //path가 기억하는 좌표를 화면에 갱신 canvas.drawPath(path, paint); }//onDraw() // 터치 감지 @Override public boolean onTouchEvent(MotionEvent event) { x = (int)event.getX(); y = (int)event.getY(); switch(event.getAction()) { case MotionEvent.ACTION_DOWN: //터치된 x,y 좌표를 기억. path.moveTo(x,y); break; case MotionEvent.ACTION_MOVE: x = (int)event.getX(); y = (int)event.getY(); path.lineTo(x,y); break; } //onDraw() (화면갱신) 호출 invalidate(); return true; } }