实例介绍
【实例截图】
【核心代码】
package com.example.brewclock; 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 BrewClockActivity extends Activity implements OnClickListener { /** Properties **/ protected Button brewAddTime; protected Button brewDecreaseTime; protected Button startBrew; protected TextView brewCountLabel; protected TextView brewTimeLabel; protected int brewTime = 3; protected CountDownTimer brewCountDownTimer; protected int brewCount = 0; protected boolean isBrewing = false; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Connect interface elements to properties brewAddTime = (Button) findViewById(R.id.brew_time_up); brewDecreaseTime = (Button) findViewById(R.id.brew_time_down); startBrew = (Button) findViewById(R.id.brew_start); brewCountLabel = (TextView) findViewById(R.id.brew_count_label); brewTimeLabel = (TextView) findViewById(R.id.brew_time); // Setup ClickListeners brewAddTime.setOnClickListener(this); brewDecreaseTime.setOnClickListener(this); startBrew.setOnClickListener(this); // Set the initial brew values setBrewCount(0); setBrewTime(3); } /** Methods **/ /** * Set an absolute value for the number of minutes to brew. Has no effect if a brew * is currently running. * @param minutes The number of minutes to brew. */ public void setBrewTime(int minutes) { if(isBrewing) return; brewTime = minutes; if(brewTime < 1) { brewTime = 1; } brewTimeLabel.setText(String.valueOf(brewTime) "m"); } /** * Set the number of brews that have been made, and update the interface. * @param count The new number of brews */ public void setBrewCount(int count) { brewCount = count; brewCountLabel.setText(String.valueOf(brewCount)); } /** * Start the brew timer */ public void startBrew() { // Create a new CountDownTimer to track the brew time brewCountDownTimer = new CountDownTimer(brewTime * 60 * 1000, 1000) { @Override public void onTick(long millisUntilFinished) { brewTimeLabel.setText(String.valueOf(millisUntilFinished / 1000) "s"); } @Override public void onFinish() { isBrewing = false; setBrewCount(brewCount 1); brewTimeLabel.setText("Brew Up!"); startBrew.setText("Start"); } }; brewCountDownTimer.start(); startBrew.setText("Stop"); isBrewing = true; } /** * Stop the brew timer */ public void stopBrew() { if(brewCountDownTimer != null) { brewCountDownTimer.cancel(); } isBrewing = false; startBrew.setText("Start"); } /** Interface Implementations **/ /* (non-Javadoc) * @see android.view.View.OnClickListener#onClick(android.view.View) */ public void onClick(View v) { if(v == brewAddTime) { setBrewTime(brewTime 1); } else if(v == brewDecreaseTime) { setBrewTime(brewTime -1); } else if(v == startBrew) { if(isBrewing) { stopBrew(); } else { startBrew(); } } } }
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