android开发备忘录

      程序描述:实现备忘录的设置和提醒，当运行软件时，在主界面可以设定备忘录内容，单击"设置闹钟"按钮设置提醒的时间。每设置一个备忘录，会在按钮下方记录所设定的备忘录，方便用户查看。当设定备忘录的时间到时，在主界面上自动弹出一个对话框。

程序效果图:

给出布局文件:

布局比较简单，垂直排列。

下面给出功能代码:

package com.example.memodemo;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.AlertDialog;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;

public class MainActivity extends Activity {

	private EditText et;
	private Button btn;
	private TextView tv;
	private int count;
	private StringBuilder sb;
	private String msg;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		sb = new StringBuilder();
		Bundle bundle = this.getIntent().getExtras();
		if(bundle != null){
			new AlertDialog.Builder(MainActivity.this)
			.setIcon(null)
			.setTitle("温馨提示")
			.setMessage("备忘录时间到了,请注意")
			.setPositiveButton("关闭", new DialogInterface.OnClickListener() {
				
				@Override
				public void onClick(DialogInterface dialog, int which) {
					MainActivity.this.finish();
				}
			})
			.create().show();
		}
		InitViews();
	}

	private void InitViews() {
		et = (EditText) findViewById(R.id.et);
		btn = (Button) findViewById(R.id.btn);
		tv = (TextView) findViewById(R.id.tv);
		
		final Calendar c = Calendar.getInstance();
		c.setTimeInMillis(System.currentTimeMillis());//设置当前时间为c的时间
		final int hour = c.get(Calendar.HOUR_OF_DAY);
		final int minute = c.get(Calendar.MINUTE);
		btn.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				msg = et.getText().toString().trim();
				sb.append(count++);
				sb.append("备忘录的内容为:");
				sb.append(msg);
				sb.append("\n");
				tv.setText(sb.toString().trim());
				new TimePickerDialog(
						MainActivity.this, 
						new TimePickerDialog.OnTimeSetListener(){

							@Override
							public void onTimeSet(TimePicker view,int hourOfDay, int minute) {
								c.setTimeInMillis(System.currentTimeMillis());
								c.set(Calendar.HOUR_OF_DAY, hourOfDay);
								c.set(Calendar.MINUTE, minute);
								c.set(Calendar.SECOND, 0);
								c.set(Calendar.MILLISECOND, 0);
								AlarmManager am = (AlarmManager) MainActivity.this.getSystemService(Context.ALARM_SERVICE);
								Intent intent = new Intent(MainActivity.this,AlarmReceive.class);
								PendingIntent pi = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);
								am.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pi);
							
								String tempHour = (hour+"").length()>1?hour+"":"0"+hour;
								String tempMinute = (minute+"").length()>1?minute+"":"0"+minute;
								Toast.makeText(MainActivity.this, "设置时间为:"+tempHour+":"+tempMinute, Toast.LENGTH_SHORT).show();
							}
						}, 
						hour, 
						minute, 
						true).show();
			}
		});
	}
}

当点击按钮时，会弹出一个时间提示框，该控件可以参考博客:设定好时间后，获取系统提供的闹钟服务，将当前设定的时间传入闹钟第二个参数:

AlarmManager am = (AlarmManager) MainActivity.this.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(MainActivity.this,AlarmReceive.class);
PendingIntent pi = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);
am.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pi);

然后通过广播监听该闹铃，如果时间一到，广播接受者发送一个消息到主界面，在主界面判断传入的Bunble是否为空，不为空，则提示备忘录时间到了。代码如下:

package com.example.memodemo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;

public class AlarmReceive extends BroadcastReceiver{

	@Override
	public void onReceive(Context context, Intent intent) {
		Intent tempIntent = new Intent(context,MainActivity.class);
		Bundle bundle = new Bundle();
		bundle.putString("msg", "msg");
		tempIntent.putExtras(bundle);
		tempIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//设置新的task
		context.startActivity(tempIntent);
	}
}

然后需要在清单文件注册该广播:

代码链接: