我想制作一个简单的项目,可以在计时器中显示Toast。计时器将使用服务启动。然后,当服务启动时,计时器开始计时,并在服务停止时停止计时。
第一类
package com.example.connect;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button button1,button2;
private Handler mHandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1=(Button)findViewById(R.id.button1);
button2=(Button)findViewById(R.id.button2);
}
public void Start(View v)
{
startService(new Intent(MainActivity.this , Connect_service.class));
}
public void Stop(View v)
{
stopService(new Intent(MainActivity.this , Connect_service.class));
}
}
第二课
package com.example.connect;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;
public class Connect_service extends Service{
Timer timer = new Timer();
TimerTask updateProfile = new CustomTimerTask(Connect_service.this);
public void onCreate() {
super.onCreate();
Toast.makeText(this, "Service Started", Toast.LENGTH_SHORT).show();
timer.scheduleAtFixedRate(updateProfile, 0, 5000);
}
@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Stopped", Toast.LENGTH_SHORT).show();
timer.cancel();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
第三课
package com.example.connect;
import java.util.TimerTask;
import android.content.Context;
import android.os.Handler;
import android.widget.Toast;
public class CustomTimerTask extends TimerTask {
private Context context;
private Handler mHandler = new Handler();
public CustomTimerTask(Context con) {
this.context = con;
}
@Override
public void run() {
new Thread(new Runnable() {
public void run() {
mHandler.post(new Runnable() {
public void run() {
Toast.makeText(context, "In Timer", Toast.LENGTH_SHORT).show();
}
});
}
}).start();
}
}