【Android】开发一个简单时钟应用每天看时间起床

news2024/10/6 22:25:22

有没有想过，家里闲置不用的旧手机可以当时钟闹钟来用，觉得这个想法可以吧，把闲置手机充分利用起来了呢，接下来给大家讲一下如何实现，功能简单，可以当作编程入门课。

在电脑上，打开我们熟悉的AndroidStudio开发工具，选择新建一个项目，名字自己随意填，例如我的叫AlarmClock，选择空页模板，然后等待它创建好

先找到文件activity_main.xml，去做一下布局，设置一下横屏，布局完成后，效果如下图所示
在这里插入图片描述
接下来，找到文件MainActivity.java，开始写代码，很简单的，只需少许代码，详细如下

public class MainActivity extends AppCompatActivity {

    TextView showTime,showHour,showMinue,showDiv;
    Timer timer = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Window w = getWindow();
        //保持屏显常亮
        w.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        //隐藏状态栏
        w.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

        //隐藏标题栏
        ActionBar aBar = getSupportActionBar();
        if(aBar!=null){
            aBar.hide();
        }else{
            this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        }

        setContentView(R.layout.activity_main);
        showTime = this.findViewById(R.id.show_time);
        showHour = this.findViewById(R.id.textView_h);
        showMinue = this.findViewById(R.id.textView_m);
        showDiv = this.findViewById(R.id.textView_div);

        //线程通信
        final Handler handler = new Handler();
        //更新UI
        final Runnable run = new Runnable() {
            @Override
            public void run() {
                updateShowTime();
            }
        };
        //定时器
        TimerTask tTask = new TimerTask() {

            @Override
            public void run() {
                handler.post(run);
            }
        };
        timer = new Timer();
        timer.schedule(tTask,0,1000);
    }

    private void updateShowTime() {
        Date time = new Date();

        showHour.setText(String.format("%02d",time.getHours()));
        showMinue.setText(String.format("%02d",time.getMinutes()));
        showTime.setText(String.format("%02d",time.getSeconds()));

        if(showDiv.getVisibility()== View.VISIBLE){
            showDiv.setVisibility(View.INVISIBLE);
        }else{
            showDiv.setVisibility(View.VISIBLE);
        }
    }

    @SuppressLint("SourceLockedOrientationActivity")
    @Override
    protected void onResume() {
        if(getRequestedOrientation()!= ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        }
        super.onResume();
    }

    @Override
    protected void onDestroy() {
        if(this.mReceiver!=null) {
            this.unregisterReceiver(this.mReceiver);
        }
        if(this.timer!=null) {
            this.timer.cancel();

        }
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        super.onDestroy();
    }
}