安卓作業----慕課移動應用開發作業18之運用AlarmManager和PendingIntent實現簡單鬧鐘

本篇通過AlarmManager和PendingIntent實現定時提醒功能，界面運用Button、TextView、Switch進行佈局

同時這也是中國大學慕課移動終端應用開發的網課作業18，我會持續更新我的作業，如果有需要關注一下吧

說明

具體的組件介紹請點擊上面鏈接，觀看課程內詳細信息，這裏不多贅述，只貼我實現的代碼。

界面展示

代碼部分

代碼包括時間設置Activity—TimePickerActivity和其對應佈局以及鬧鐘Activity—MyClockActivity

1.先在AndroidManifest.xml中設置權限

同時記得註冊Activity

 <uses-permission android:name="android.permission.VIBRATE" />

2.TimePickerActivity.java

public class TimePickerActivity extends AppCompatActivity {
    private Button mButtonChooseTime,mButtonStart,mButtonCancel;
    private TextView mTextView;
    private Switch mSwitch;
    private boolean flag = false;//是否應該震動

    private PendingIntent mPendingIntent;
    private AlarmManager mAlarmManager;
    private Intent mIntent;
    private int requestCode = 0;
    private Calendar mCalendar;

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

        mButtonChooseTime.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //用於存放當前時間
                Calendar currentTime = Calendar.getInstance();
                new TimePickerDialog(TimePickerActivity.this, new TimePickerDialog.OnTimeSetListener() {
                    @Override
                    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                        mCalendar = Calendar.getInstance();
                        long systemTime = System.currentTimeMillis();//取出當前的時間毫秒值
                        mCalendar.set(Calendar.HOUR,hourOfDay);
                        mCalendar.set(Calendar.MINUTE,minute);
                        mCalendar.set(Calendar.SECOND,0);
                        mCalendar.set(Calendar.MILLISECOND,0);

                        long setTime = mCalendar.getTimeInMillis();
                        if (systemTime>setTime){
                            mCalendar.add(Calendar.DAY_OF_MONTH,1);
                        }

                        mTextView.setText("您選擇了"+hourOfDay+"時"+minute+"分");
                    }
                }, currentTime.get(Calendar.HOUR_OF_DAY), currentTime.get(Calendar.MINUTE), false).show();
            }
        });

        mButtonStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                mAlarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
                mIntent = MyClockActivity.createIntent(TimePickerActivity.this,flag);
                mPendingIntent = PendingIntent.getActivity(TimePickerActivity.this,requestCode,mIntent,PendingIntent.FLAG_UPDATE_CURRENT);

                //設置鬧鈴
                mAlarmManager.setExact(AlarmManager.RTC,mCalendar.getTimeInMillis(),mPendingIntent);
                mButtonStart.setEnabled(false);
                mButtonCancel.setEnabled(true);
            }
        });

        mButtonCancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mAlarmManager.cancel(mPendingIntent);
                mButtonStart.setEnabled(true);
                mButtonCancel.setEnabled(false);
            }
        });

        mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                flag = isChecked;
                mButtonStart.setEnabled(true);
                mButtonCancel.setEnabled(false);
            }
        });
    }

    private void init(){
        mButtonChooseTime = findViewById(R.id.time_picker_button_choose_time);
        mButtonStart = findViewById(R.id.time_picker_button_start);
        mButtonCancel = findViewById(R.id.time_picker_button_cancel);
        mTextView = findViewById(R.id.time_picker_text_show_info);
        mSwitch = findViewById(R.id.time_picker_switch_choose);
        mButtonStart.setEnabled(false);
        mButtonCancel.setEnabled(false);
    }
}

2.activity_time_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    
    <TextView
        android:id="@+id/time_picker_text_show_info"
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:textSize="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:id="@+id/time_picker_button_choose_time"
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:text="選擇時間"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <LinearLayout
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:text="是否震動  "
            android:textSize="20dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <Switch
            android:id="@+id/time_picker_switch_choose"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </LinearLayout>
    <Button
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:id="@+id/time_picker_button_start"
        android:text="開啓定時"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:layout_gravity="center"
        android:layout_marginTop="30dp"
        android:id="@+id/time_picker_button_cancel"
        android:text="取消定時"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

3.MyClockActivity.java

public class MyClockActivity extends AppCompatActivity {
    private MediaPlayer mMediaPlayer;
    private boolean flag;
    private Vibrator mVibrator;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_clock);
        //獲取傳遞過來的信息
        flag = getIntent().getBooleanExtra("flag",false);

        mMediaPlayer = MediaPlayer.create(this,R.raw.music);
        mMediaPlayer.start();
//        彈出一個鬧鐘提醒對話框---關閉鬧鐘，讓播放鬧鐘的media play停止播放聲音
        new AlertDialog.Builder(this)
                .setTitle("鬧鐘")
                .setMessage("時間到了")
                .setPositiveButton("關閉鬧鐘", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        mMediaPlayer.stop();
                        if (flag){
                            mVibrator.cancel();
                        }
                        MyClockActivity.this.finish();

                    }
                }).show();

        if (flag){
            //震動
            mVibrator = (Vibrator) MyClockActivity.this.getSystemService(MyClockActivity.VIBRATOR_SERVICE);
            long [] patter = {1000, 1000, 2000, 50};
            mVibrator.vibrate(patter, 0);
        }
    }

    public static Intent createIntent(Context context,boolean flag){
        Intent intent = new Intent(context,MyClockActivity.class);
        intent.putExtra("flag",flag);
        return intent;
    }
}

鈴聲資源

在res下新建一個raw文件夾，將音頻文件放入，命名爲music.xxx

總結

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