今日总结2023/03/09

今天只有一节体育课，继续完善个人作业的APP开发，今天学习了闹钟组件的应用，timepicker的设置，代码如下

package com.example.nao;

import androidx.appcompat.app.AppCompatActivity;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TimePicker;
import android.widget.Toast;

import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private Button btn_set;
    private Button btn_cancel;
    private AlarmManager alarmManager;
    private Timer timer;
    private TimerTask timerTask;
    private Intent intent1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        timer=new Timer();
        setContentView(R.layout.activity_main);timerTask = new TimerTask() {
            @Override
            public void run() {
                intent1=new Intent(MainActivity.this,ClockActivity.class);
                intent1.putExtra("nao","jjjjjjj");
                startActivity(intent1);
            }
        };
        bindViews();

    }

    private void bindViews() {
        btn_set = (Button) findViewById(R.id.btn_set);
        btn_cancel = (Button) findViewById(R.id.btn_cancel);
        btn_set.setOnClickListener(this);
        btn_cancel.setOnClickListener(this);

    }


    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btn_set:
                Calendar currentTime = Calendar.getInstance();
                new TimePickerDialog(MainActivity.this, 0,
                        new TimePickerDialog.OnTimeSetListener() {
                            @Override
                            public void onTimeSet(TimePicker view,
                                                  int hourOfDay, int minute) {
                                //设置当前时间
                                Calendar c = Calendar.getInstance();
                                c.setTimeInMillis(System.currentTimeMillis());
                                // 根据用户选择的时间来设置Calendar对象
                                c.set(Calendar.HOUR, hourOfDay);
                                c.set(Calendar.MINUTE, minute);
                                // ②设置AlarmManager在Calendar对应的时间启动Activity
timer.schedule(timerTask,c.getTimeInMillis()-currentTime.getTimeInMillis(),1000000);
                                Log.e("HEHE",c.getTimeInMillis()+"");   //这里的时间是一个unix时间戳
                                // 提示闹钟设置完毕:
                                Toast.makeText(MainActivity.this, "闹钟设置完毕~"+ c.getTimeInMillis(),
                                        Toast.LENGTH_SHORT).show();
                            }
                        }, currentTime.get(Calendar.HOUR_OF_DAY), currentTime
                        .get(Calendar.MINUTE), true).show();
                btn_cancel.setVisibility(View.VISIBLE);
                break;
            case R.id.btn_cancel:
                timer.cancel();
                btn_cancel.setVisibility(View.GONE);
                Toast.makeText(MainActivity.this, "闹钟已取消", Toast.LENGTH_SHORT)
                        .show();
                break;
        }
    }
}

ClockActivity.java

package com.example.nao;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;

/**
 * Created by Jay on 2015/10/25 0025.
 */
public class ClockActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_clock);
        Intent intent=new Intent();
        intent=getIntent();
        String nao = intent.getStringExtra("nao");

        //创建一个闹钟提醒的对话框,点击确定关闭铃声与页面
        new AlertDialog.Builder(ClockActivity.this).setTitle("闹钟").setMessage(nao)
                .setPositiveButton("关闭闹铃", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ClockActivity.this.finish();
                    }
                }).show();
    }
}