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01src/XiaoMiNotes/MyApplication/app/src/main/java/net/micode/notes/timer/CountDown.java

@@ -0,0 +1,156 @@
+package net.micode.notes.timer;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.Button;
+import android.widget.Toast;
+import android.widget.TextView;
+import android.os.CountDownTimer;
+import android.media.MediaPlayer;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.MenuInflater;
+import android.view.MenuItem.OnMenuItemClickListener;
+
+import androidx.activity.EdgeToEdge;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+
+
+import net.micode.notes.R;
+
+public class CountDown extends AppCompatActivity implements CountDownListener {
+    private Button startButton,resetButton,stopButton;
+    private static final int HOUR = 60*60*1000;//小时
+    private static final int MIN = 60*1000;//分钟
+    private static final int SEC = 1000;//秒
+    private long hour,min,sec;
+    private boolean IsRunning;//是不是在跑
+    private long startTime;//开始时间
+    private long currentTime;//还剩多久
+    private CountDownTimer timer;
+    private CountDownListener listener;
+
+
+
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+        //getWindow().setBackgroundDrawableResource(R.drawable.cloud);
+        setContentView(R.layout.activity_count_down);
+        startButton = findViewById(R.id.button_start);
+        resetButton = findViewById(R.id.button_reset);
+        stopButton = findViewById(R.id.button_stop);//按钮
+        startButton.setOnClickListener(new View.OnClickListener() {
+            @Override public void onClick(View view) {
+                start();
+            }
+        });
+
+        resetButton.setOnClickListener(new View.OnClickListener() {
+            @Override public void onClick(View view) {
+                reset();
+            }
+        });
+
+        stopButton.setOnClickListener(new View.OnClickListener() {
+            @Override public void onClick(View view) {
+                stop();
+            }
+        });
+        Intent intent = this.getIntent();
+        hour=intent.getLongExtra("hour", 0L);
+        min=intent.getLongExtra("min", 0L);
+        sec=intent.getLongExtra("sec", 0L);
+        currentTime=startTime=hour*HOUR+min*MIN+sec*SEC;
+        updateTime(startTime);
+        IsRunning=false;
+        start();//开始跑
+
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
+            return insets;
+        });
+
+    }
+    public void setTime(long duration){
+        if(IsRunning)return;
+        currentTime=startTime=duration;
+        updateTime(duration);
+    }
+
+    public void start() {
+        if(IsRunning) {return;}//还在跑
+        IsRunning = true;
+        timer = new CountDownTimer(currentTime, 100){//精度100ms
+            @Override public void onTick(long millis){
+                currentTime = millis;
+                updateTime(millis);
+                //invalidate();
+            }
+
+            @Override public void onFinish() {
+                stop();
+                if (listener != null) {
+                    listener.onFinishCountDown();
+                }
+
+            }
+        };
+        timer.start();
+    }
+
+    public void reset() {
+        stop();
+        setTime(startTime);
+        //invalidate();
+    }
+
+    public void stop() {
+        if(!IsRunning){return;}//已经停了
+        IsRunning=false;
+        timer.cancel();
+        setListener(this);//监听器
+    }
+
+    public void updateTime(long duration){//展示倒计时数字
+        TextView timeView = findViewById(R.id.timeshow);
+        String res=getTimeShow(duration);
+        timeView.setText(res);
+    }
+    public String getTimeShow(long duration){//获取显示数字
+        int hour=(int)duration/HOUR;
+        duration%=HOUR;
+        int min=(int)duration/MIN;
+        duration%=MIN;
+        int sec=(int)duration/SEC;
+        String format="%02d";
+        String Shour = String.format(format, hour);
+        String Smin = String.format( format, min);
+        String Ssec = String.format(format, sec);
+        return String.format("%s h : %s m : %s s", Shour, Smin, Ssec);
+    }
+    public void setListener(CountDownListener listener) {
+        this.listener = listener;
+    }
+    @Override
+    public void onFinishCountDown() {//倒计时截至
+        //Toast.makeText(this, "Time up !!!", Toast.LENGTH_SHORT).show();
+        TextView timeView = findViewById(R.id.timeshow);
+        timeView.setText("Time up ！！！");
+        MediaPlayer player=MediaPlayer.create(this,R.raw.timedown);
+        player.start();
+    }
+
+
+}
+
+
+

01src/XiaoMiNotes/MyApplication/app/src/main/java/net/micode/notes/timer/CountDownListener.java

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+package net.micode.notes.timer;
+
+public interface CountDownListener {//监听器
+	public void onFinishCountDown();//是否完成倒计时
+}

01src/XiaoMiNotes/MyApplication/app/src/main/res/layout/activity_count_down.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center"
+    android:orientation="vertical"
+    tools:context=".timer.CountDown">
+
+    <TextView
+        android:id="@+id/timeshow"
+        android:layout_width="match_parent"
+        android:layout_height="100dp"
+        android:gravity="center"
+        android:textSize="50dp"
+        android:orientation="horizontal"
+        app:layout_constraintBottom_toTopOf="@+id/button_stop"
+        app:layout_constraintTop_toTopOf="parent"
+        />
+
+
+    <Button
+        android:id="@+id/button_reset"
+
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Reset"
+        android:textSize="30dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/button_stop"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.9" />
+
+    <Button
+        android:id="@+id/button_stop"
+
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Stop"
+        android:textSize="30dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.9" />
+
+    <Button
+        android:id="@+id/button_start"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Start"
+        android:textSize="30dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toStartOf="@+id/button_stop"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.9" />
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>