Android Open Source - firstcodeandroid Main Activity

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License

The source code is released under:

MIT License

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Java Source Code

package com.jikexueyuan.counttime;
//from   w w w  . ja v a2 s.com
import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class MainActivity extends Activity implements OnClickListener{
  
  private EditText inputet;
  private Button getTime,startTime,stopTime;
  private TextView time;
  private int i = 0;
  private Timer timer = null;
  private TimerTask task = null;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }
    
    private void initView(){
      inputet = (EditText) findViewById(R.id.inputtime);
        getTime = (Button) findViewById(R.id.gettime);
        startTime = (Button) findViewById(R.id.starttime);
        stopTime = (Button) findViewById(R.id.stoptime);
        time = (TextView) findViewById(R.id.time);
        getTime.setOnClickListener(this);
        startTime.setOnClickListener(this);
        stopTime.setOnClickListener(this);
    }

  @Override
  public void onClick(View v) {
    switch (v.getId()) {
    case R.id.gettime:
      time.setText(inputet.getText().toString());
      i = Integer.parseInt(inputet.getText().toString());
      break;

    case R.id.starttime:
      startTime();
      break;
    case R.id.stoptime:
      stopTime();
      break;
    }
  }
  
  private Handler mHandler = new Handler(){
    public void handleMessage(Message msg) {
      time.setText(msg.arg1+"");
      startTime();
    };
  };
  
  public void startTime(){
    timer = new Timer();
    task = new TimerTask() {
      
      @Override
      public void run() {
        i--;
        Message  message = mHandler.obtainMessage();
        message.arg1 = i;
        mHandler.sendMessage(message);
      }
    };
    timer.schedule(task, 1);
  }
  
  public void stopTime(){
    timer.cancel();
  }
    
}

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