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package cn.itcast.time; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends Activity { private TextView minText; private TextView secText; private boolean paused = false; private String timeUsed; private int timeUsedInSec; private Handler uiHandler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what) { case 1: if (!paused) { addTimeUsed(); updateClockUI(); } uiHandler.sendEmptyMessageDelayed(1, 1000); break; default: break; } } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); minText = (TextView) this.findViewById(R.id.min); secText = (TextView) this.findViewById(R.id.sec); Button button = (Button) this.findViewById(R.id.button); Button sbutton=(Button)this.findViewById(R.id.stop); sbutton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { paused = true; timeUsedInSec=0; } }); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { uiHandler.removeMessages(1); startGame(); paused = false; } }); } @Override protected void onPause() { super.onPause(); paused = true; } @Override protected void onResume() { super.onResume(); paused = false; } private void startGame() { uiHandler.sendEmptyMessageDelayed(1, 1000); } // 更新时间的显示 private void updateClockUI() { minText.setText(getMin()+":"); secText.setText(getSec()); } public void addTimeUsed() { timeUsedInSec=timeUsedInSec+1; timeUsed = this.getMin() + ":" + this.getSec(); } public CharSequence getMin() { return String.valueOf(timeUsedInSec / 60); } public CharSequence getSec() { int sec = timeUsedInSec % 60; return sec < 10 ? "0" + sec : String.valueOf(sec); } }