MainActivity.java
package com.example.androidcountdowntimer;
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity{
CountDownTimer countDownTimer;
int state;
final static int STATE_IDLE = 0;
final static int STATE_RED = 1;
final static int STATE_GREEN = 2;
final static int STATE_BLUE = 3;
TextView myState, myCounter;
Button btnStart;
SpotView mySpotView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mySpotView = (SpotView)findViewById(R.id.myspotview);
myState = (TextView) findViewById(R.id.mystate);
myCounter = (TextView) findViewById(R.id.mycounter);
btnStart = (Button) findViewById(R.id.start);
btnStart.setOnClickListener(btnStartOnClickListener);
state = STATE_IDLE;
}
OnClickListener btnStartOnClickListener =
new OnClickListener(){
@Override
public void onClick(View v) {
if(countDownTimer!=null){
countDownTimer.cancel();
}
state = STATE_RED;
countDownTimer = new CountDownTimer(3000, 500) {
@Override
public void onTick(long millisUntilFinished) {
myCounter.setText("onTick: " + millisUntilFinished);
}
@Override
public void onFinish() {
if(state == STATE_RED){
state = STATE_GREEN;
mySpotView.setSpots(false, true, false);
myState.setText("GREEN");
}else if(state == STATE_GREEN){
state = STATE_BLUE;
mySpotView.setSpots(false, false, true);
myState.setText("BLUE");
}else if(state == STATE_BLUE){
state = STATE_RED;
mySpotView.setSpots(true, false, false);
myState.setText("RED");
}
countDownTimer.start();
}
};
mySpotView.setSpots(true, false, false);
myState.setText("RED");
countDownTimer.start();
}
};
}
SpotView.java
package com.example.androidcountdowntimer;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
public class SpotView extends View{
boolean spotRedOn, spotGreenOn, spotBlueOn;
Paint paintRed, paintGreen, paintBlue;
public SpotView(Context context) {
super(context);
init();
}
public SpotView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public SpotView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init(){
paintRed = new Paint();
paintRed.setColor(Color.RED);
paintRed.setStrokeWidth(1);
paintRed.setStyle(Paint.Style.FILL);
paintGreen = new Paint();
paintGreen.setColor(Color.GREEN);
paintGreen.setStrokeWidth(1);
paintGreen.setStyle(Paint.Style.FILL);
paintBlue = new Paint();
paintBlue.setColor(Color.BLUE);
paintBlue.setStrokeWidth(1);
paintBlue.setStyle(Paint.Style.FILL);
spotRedOn = spotGreenOn = spotBlueOn = false;
}
public void setSpots(boolean r, boolean g, boolean b){
spotRedOn = r;
spotGreenOn = g;
spotBlueOn = b;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
float w = getWidth();
float h = getHeight();
if(spotRedOn){
canvas.drawCircle(w/4, h/2, 100, paintRed);
}
if(spotGreenOn){
canvas.drawCircle(w/2, h/2, 100, paintGreen);
}
if(spotBlueOn){
canvas.drawCircle(3*w/4, h/2, 100, paintBlue);
}
}
}
Keep using the same layout in previous example.
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