Android APP：秒表

2023-11-17 01:40| 来源: 网络整理| 查看: 265

这几天一直在看安卓，也正好赶上老师布置的作业，所以就做了一个秒表。自己参考了一下别人的图标，有了一些灵感所以顺便也设计了一下界面。下面先贴一下秒表的界面：

打开秒表后的第一个界面：点击开始计时，开始键变为暂停，记录和停止开始变实：

点击记录：记录满了之后自动上移，通过滑动可以查看前面的：

点击暂停：停止：

重新开始和记录：双击返回键退出：

下面贴出Activity的代码：

package com.example.stopwatch; import java.util.Timer; import java.util.TimerTask; import android.R.bool; import android.app.Activity; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.app.Dialog; import android.content.DialogInterface; import android.content.Intent; import android.content.res.AssetManager; import android.content.res.ColorStateList; import android.graphics.Color; import android.graphics.Typeface; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.text.Html; import android.view.Gravity; import android.view.KeyEvent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ScrollView; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { private boolean mStart = false; private long mStartTime; private boolean mIsRecorded; private LinearLayout linearLayout; private int recordTimes; private long currentTime; private long lastTime = 0; private long tmpTime; private boolean isExit = false; //更新显示时间的关键 private Handler mHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case 1: if (mStart) { updateTime(); mHandler.sendEmptyMessage(1); } break; case 0: break; default: break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView textView1 = (TextView) findViewById(R.id.textView1); TextView textView2 = (TextView) findViewById(R.id.textView2); //修改时间的字体 AssetManager mgr=getAssets();//得到AssetManager Typeface tf=Typeface.createFromAsset(mgr, "fonts/lanting.TTF");//根据路径得到Typeface textView1.setTypeface(tf); textView2.setTypeface(tf); final Button button_start = (Button) findViewById(R.id.button_start); final Button button_record = (Button) findViewById(R.id.button_record); final Button button_stop = (Button) findViewById(R.id.button_stop); button_start.setText("开始"); //监听开始按钮 button_start.setOnClickListener(new OnClickListener(){ public void onClick(View V) { if(button_start.getText() == "开始") { mStart = true; mStartTime = System.currentTimeMillis(); button_start.setText("暂停"); button_record.setBackgroundResource(R.drawable.button_record_full); button_stop.setBackgroundResource(R.drawable.button_stop_full); lastTime = 0; recordTimes = 0; linearLayout = (LinearLayout) findViewById(R.id.linearlayout1); linearLayout.removeAllViewsInLayout(); mHandler.sendEmptyMessage(1); } else if(button_start.getText() == "暂停"){ mStart = false; tmpTime = System.currentTimeMillis(); button_start.setText("继续"); button_record.setBackgroundResource(R.drawable.button_record_half); mHandler.sendEmptyMessage(0); } else { mStart = true; long tmp = System.currentTimeMillis() - tmpTime; mStartTime = mStartTime + tmp; button_start.setText("暂停"); button_record.setBackgroundResource(R.drawable.button_record_full); mHandler.sendEmptyMessage(1); } } }); //监听停止按钮 button_stop.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub if(button_start.getText() != "开始"){ mStart = false; button_start.setText("开始"); button_stop.setBackgroundResource(R.drawable.button_stop_half); button_record.setBackgroundResource(R.drawable.button_record_half); TextView textView1 = (TextView) findViewById(R.id.textView1); TextView textView2 = (TextView) findViewById(R.id.textView2); textView1.setText("00:00:00"); textView2.setText("00"); } } }); //监听记录按钮 button_record.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub if(button_start.getText() == "暂停"){ mIsRecorded = true; mHandler.sendEmptyMessage(1); } } }); } //更新显示时间和显示记录的时间 private void updateTime() { TextView textView1 = (TextView) findViewById(R.id.textView1); TextView textView2 = (TextView) findViewById(R.id.textView2); currentTime = System.currentTimeMillis(); long aTime = currentTime - mStartTime; StringBuilder[] sb1 = new StringBuilder[2]; sb1[0] = new StringBuilder(); sb1[1] = new StringBuilder(); sb1 = getTimeFormat(aTime); String str; textView1.setText(sb1[0]); textView2.setText(sb1[1]); if(mIsRecorded) { recordTimes++; String rec; long bTime; if (recordTimes == 1) { bTime = aTime; } else { bTime = currentTime - lastTime; } StringBuilder[] sb2 = new StringBuilder[2]; sb2[0] = new StringBuilder(); sb2[1] = new StringBuilder(); sb2 = getTimeFormat(bTime); if(recordTimes < 10) { rec = '0' + String.valueOf(recordTimes); } else { rec = String.valueOf(recordTimes); } str = "" + rec + "" + " " + sb2[0].toString() +"." + sb2[1].toString() + "" + " "; str += "" + sb1[0].toString() + "." + sb1[1].toString() + "" + ""; CharSequence charSequence = Html.fromHtml(str); TextView text1 = new TextView(this); text1.setText(charSequence); text1.setTextSize(23); text1.setTextColor(Color.WHITE); text1.setGravity(Gravity.CENTER); AssetManager mgr=getAssets();//得到AssetManager Typeface tf=Typeface.createFromAsset(mgr, "fonts/lanting.TTF");//根据路径得到Typeface text1.setTypeface(tf); TextView text2 = new TextView(this); text2.setText(" "); text2.setTextSize(10); linearLayout.addView(text2); linearLayout.addView(text1); final ScrollView scrollView = (ScrollView) findViewById(R.id.scrollView1); Runnable mScrollToBottom = new Runnable() { @Override public void run() { int off = linearLayout.getMeasuredHeight() - scrollView.getHeight(); if (off > 0) { scrollView.scrollTo(0, off); } } }; mHandler.post(mScrollToBottom); mIsRecorded =false; lastTime = currentTime; } } //把毫秒转为要显示的格式 public StringBuilder[] getTimeFormat(long time) { long tmp = time; time = time / 1000; int second = (int) (time % 60); int minute = (int) (time / 60) % 60; int hour = (int) (time / 3600); int minsecond = (int) (tmp / 10 % 100); StringBuilder[] sb = new StringBuilder[2]; sb[0] = new StringBuilder(); sb[1] = new StringBuilder(); if(hour < 10) { sb[0].append('0'); sb[0].append(String.valueOf(hour)); } else { sb[0].append(String.valueOf(hour)); } sb[0].append(':'); if(minute < 10) { sb[0].append('0'); sb[0].append(String.valueOf(minute)); } else { sb[0].append(String.valueOf(minute)); } sb[0].append(':'); if(second < 10) { sb[0].append('0'); sb[0].append(String.valueOf(second)); } else { sb[0].append(String.valueOf(second)); } if(minsecond < 10) { sb[1].append('0'); sb[1].append(minsecond); } else { sb[1].append(minsecond); } return sb; } //监听返回键，实现点击返回键时弹出对话，连续两次点击退出 @Override public boolean onKeyDown(int keyCode, android.view.KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { toast(); return false; } else if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 1) { MainActivity.this.finish(); } return false; }; /*protected void gialog() { // TODO Auto-generated method stub AlertDialog.Builder builder = new Builder(MainActivity.this); builder.setTitle("提示"); builder.setMessage("确定要退出吗？"); builder.setPositiveButton("确认", new android.content.DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); MainActivity.this.finish(); } }); builder.setNegativeButton("取消", new android.content.DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); builder.create().show(); }*/ protected void toast() { Timer tExit = null; if (isExit == false) { isExit = true; // 准备退出 Toast textToast = Toast.makeText(this, "小样！想退出？！", Toast.LENGTH_LONG); textToast.show(); tExit = new Timer(); tExit.schedule(new TimerTask() { @Override public void run() { isExit = false; // 取消退出 } }, 2000); // 如果2秒钟内没有按下返回键，则启动定时器取消掉刚才执行的任务 } else { finish(); System.exit(0); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } }

布局文件的代码：

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