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    <pre><code>//ok here is the final changed code which works well import android.app.Activity; import android.os.Bundle; import android.os.SystemClock; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Chronometer; import android.widget.LinearLayout; import android.widget.Toast; public class HelloWidgetActivity extends Activity { Chronometer mChronometer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout layout = new LinearLayout(this); layout.setOrientation(LinearLayout.VERTICAL); mChronometer = new Chronometer(this); layout.addView(mChronometer); Button startButton = new Button(this); startButton.setText("Start"); startButton.setOnClickListener(mStartListener); layout.addView(startButton); Button stopButton = new Button(this); stopButton.setText("Stop"); stopButton.setOnClickListener(mStopListener); layout.addView(stopButton); Button resetButton = new Button(this); resetButton.setText("Reset"); resetButton.setOnClickListener(mResetListener); layout.addView(resetButton); setContentView(layout); } private void showElapsedTime() { long elapsedMillis = SystemClock.elapsedRealtime() - mChronometer.getBase(); Toast.makeText(HelloWidgetActivity.this, "Elapsed milliseconds: " + elapsedMillis, Toast.LENGTH_SHORT).show(); } View.OnClickListener mStartListener = new OnClickListener() { public void onClick(View v) { int stoppedMilliseconds = 0; String chronoText = mChronometer.getText().toString(); String array[] = chronoText.split(":"); if (array.length == 2) { stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 1000 + Integer.parseInt(array[1]) * 1000; } else if (array.length == 3) { stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 60 * 1000 + Integer.parseInt(array[1]) * 60 * 1000 + Integer.parseInt(array[2]) * 1000; } mChronometer.setBase(SystemClock.elapsedRealtime() - stoppedMilliseconds); mChronometer.start(); } }; View.OnClickListener mStopListener = new OnClickListener() { public void onClick(View v) { mChronometer.stop(); showElapsedTime(); } }; View.OnClickListener mResetListener = new OnClickListener() { public void onClick(View v) { mChronometer.setBase(SystemClock.elapsedRealtime()); mChronometer.stop(); showElapsedTime(); } }; } </code></pre>
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