android studio秒表代码

以下是一个简单的 Android Studio 秒表代码：

public class MainActivity extends AppCompatActivity {

    private TextView mTextView;
    private Button mStartButton;
    private Button mStopButton;
    private Button mResetButton;

    private Handler mHandler = new Handler();
    private long mStartTime;
    private long mElapsedTime;

    private Runnable mRunnable = new Runnable() {
        @Override
        public void run() {
            mElapsedTime = System.currentTimeMillis() - mStartTime;
            int seconds = (int) (mElapsedTime / 1000);
            int minutes = seconds / 60;
            seconds = seconds % 60;
            int milliseconds = (int) (mElapsedTime % 1000);
            mTextView.setText(String.format("%d:%02d:%03d", minutes, seconds, milliseconds));
            mHandler.postDelayed(this, 10);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = findViewById(R.id.text_view);
        mStartButton = findViewById(R.id.start_button);
        mStopButton = findViewById(R.id.stop_button);
        mResetButton = findViewById(R.id.reset_button);

        mStartButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mStartTime = System.currentTimeMillis();
                mHandler.postDelayed(mRunnable, 0);
            }
        });

        mStopButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mHandler.removeCallbacks(mRunnable);
            }
        });

        mResetButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mHandler.removeCallbacks(mRunnable);
                mTextView.setText("0:00:000");
            }
        });
    }
}

这个代码实现了一个简单的秒表功能，包括开始、停止和重置按钮。当用户点击开始按钮时，秒表开始计时，当用户点击停止按钮时，秒表停止计时，当用户点击重置按钮时，秒表归零。