Android基础：Broadcast

一.对话框

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private boolean[] checkedItems;//记录各列表项的状态
    private String[] items;//各列表项要显示的内容

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button1 = (Button) findViewById(R.id.button1); // 获取“显示带取消、确定按钮的对话框”按钮
        // 为“显示带取消、确定按钮的对话框”按钮添加单击事件监听器
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建对话框对象
                AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
                alertDialog.setIcon(R.drawable.advise); //设置对话框的图标
                alertDialog.setTitle("乔布斯:");      //设置对话框的标题
                alertDialog.setMessage("活着就是为了改变世界，难道还有其他原因吗？");    //设置要显示的内容
                //添加取消按钮
                alertDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "否", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "您单击了否按钮", Toast.LENGTH_SHORT).show();
                    }
                });
                //添加确定按钮
                alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "是", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "您单击了是按钮 ", Toast.LENGTH_SHORT).show();
                    }
                });
                alertDialog.show(); //显示对话框
            }
        });
        Button button2 = (Button) findViewById(R.id.button2);  // 获取“显示带列表的对话框”按钮
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建名言字符串数组
                final String[] items = new String[]{"当你有使命，它会让你更专注", "要么出众，要么出局", "活着就是为了改变世界",
                        "求知若饥，虚心若愚"};
                //创建列表对话框对象
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setIcon(R.drawable.advise1);                    //设置对话框的图标
                builder.setTitle("请选择你喜欢的名言：");            //设置对话框的标题
                //添加列表项
                builder.setItems(items, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this,
                                "您选择了" + items[which], Toast.LENGTH_SHORT).show();

                    }
                });
                builder.create().show();  // 创建对话框并显示
            }
        });
        Button button3 = (Button) findViewById(R.id.button3);  // 获取“显示带单选列表项的对话框”按钮
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建名字字符串数组
                final String[] items = new String[]{"扎克伯格", "乔布斯", "拉里.埃里森", "安迪.鲁宾", "马云"};
                // 显示带单选列表项的对话框
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setIcon(R.drawable.advise2);                            //设置对话框的图标
                builder.setTitle("如果让你选择，你最想做哪一个：");                    //设置对话框的标题
                builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this,
                                "您选择了" + items[which], Toast.LENGTH_SHORT).show();    //显示选择结果
                    }
                });
                builder.setPositiveButton("确定", null);                            //添加确定按钮
                builder.create().show();                                    // 创建对话框并显示
            }
        });
        Button button4 = (Button) findViewById(R.id.button4);  // 获取“显示带多选列表项的对话框”按钮
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkedItems = new boolean[]{false, true, false, true, false}; //记录各列表项的状态
                //各列表项要显示的内容
                items = new String[]{"开心消消乐", "球球大作战", "欢乐斗地主", "梦幻西游", "超级玛丽"};
                // 显示带单选列表项的对话框
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setIcon(R.drawable.advise2);                        //设置对话框的图标
                builder.setTitle("请选择您喜爱的游戏：");                    //设置对话框标题
                builder.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        checkedItems[which] = isChecked;            //改变被操作列表项的状态

                    }
                });
                //为对话框添加“确定”按钮
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String result = "";
                        for (int i = 0; i < checkedItems.length; i++) {
                            if (checkedItems[i]) {                        //当选项被选择时
                                result += items[i] + "、";                    //将选项的内容添加到result中
                            }
                        }
                        //当result不为空时，通过消息提示框显示选择的结果
                        if (!"".equals(result)) {
                            result = result.substring(0, result.length() - 1);        //去掉最后面添加的“、”号
                            Toast.makeText(MainActivity.this,
                                    "您选择了[ " + result + " ]", Toast.LENGTH_LONG).show();
                        }

                    }
                });
                builder.create().show();                                // 创建对话框并显示
            }
        });
    }
}

二.通知栏
1.获取通知管理器并创建一个Notification对象

final NotificationManager notificationManager =
                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Notification.Builder notification = new Notification.Builder(this); 

2.设置通知
3.发送通知

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends Activity {
    final int NOTIFYID = 0x123;            //通知的ID

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取通知管理器，用于发送通知
        final NotificationManager notificationManager =
                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Notification.Builder notification = new Notification.Builder(this); // 创建一个Notification对象
        // 设置打开该通知，该通知自动消失
        notification.setAutoCancel(true);
        // 设置通知的图标
        notification.setSmallIcon(R.drawable.packet);
        // 设置通知内容的标题
        notification.setContentTitle("奖励百万红包！！！");
        // 设置通知内容
        notification.setContentText("点击查看详情！");
        //设置使用系统默认的声音、默认震动
        notification.setDefaults(Notification.DEFAULT_SOUND
                | Notification.DEFAULT_VIBRATE);
        //设置发送时间
        notification.setWhen(System.currentTimeMillis());
        // 创建一个启动其他Activity的Intent
        Intent intent = new Intent(MainActivity.this
                , DetailActivity.class);
        PendingIntent pi = PendingIntent.getActivity(
                MainActivity.this, 0, intent, 0);
        //设置通知栏点击跳转
        notification.setContentIntent(pi);
        //发送通知
        notificationManager.notify(NOTIFYID, notification.build());

    }
}

三.广播
1.在Activity中发送广播
sendBroadcast(intent);
2.编写广播接收器代码

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {
    private static final String action1="com.mingrisoft";//声明第一个动作
    private static final String action2="mingrisoft";   //声明第二个动作
    public MyReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(action1)){
            Toast.makeText(context, "MyReceiver收到:com.mingrisoft的广播",
                    Toast.LENGTH_SHORT).show(); //回复该动作收到广播
        }else if (intent.getAction().equals(action2)){
            Toast.makeText(context, "MyReceiver收到:mingrisoft的广播",
                    Toast.LENGTH_SHORT).show();//回复该动作收到广播
        }

    }
}

3.在AndroidManifest中注册广播

<receiver
            android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.mingrisoft"></action>
                <action android:name="mingrisoft"></action>
            </intent-filter>
        </receiver>

四.闹钟

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TimePicker;
import android.widget.Toast;

import java.util.Calendar;

public class MainActivity extends Activity {
    TimePicker timepicker; 			// 时间拾取器
    Calendar c; 					// 日历对象

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        c=Calendar.getInstance();                  //获取日历对象
        timepicker = (TimePicker) findViewById(R.id.timePicker1);            // 获取时间拾取组件
        timepicker.setIs24HourView(true);                            // 设置使用24小时制
        Button button1 = (Button) findViewById(R.id.button1); 					// 获取“设置闹钟”按钮
        // 为“设置闹钟”按钮添加单击事件监听器
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,
                        AlarmActivity.class);                            // 创建一个Intent对象
                PendingIntent pendingIntent = PendingIntent.getActivity(
                        MainActivity.this, 0, intent, 0);                    // 获取显示闹钟的PendingIntent对象
                // 获取AlarmManager对象
                AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
                c.set(Calendar.HOUR_OF_DAY, timepicker.getCurrentHour());    // 设置闹钟的小时数
                c.set(Calendar.MINUTE, timepicker.getCurrentMinute());        // 设置闹钟的分钟数
                c.set(Calendar.SECOND,0);                                      // 设置闹钟的秒数
                alarm.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(),
                        pendingIntent);                                // 设置一个闹钟
                Toast.makeText(MainActivity.this, "闹钟设置成功", Toast.LENGTH_SHORT)
                        .show();                                    // 显示一个消息提示
            }
        });

    }
}

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

/**
 * Created by Administrator on 2016/3/23.
 */
public class AlarmActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AlertDialog alert = new AlertDialog.Builder(this).create();
        alert.setIcon(R.drawable.alarm);						//设置对话框的图标
        alert.setTitle("传递正能量：");							//设置对话框的标题
        alert.setMessage("要么出众，要么出局");			//设置要显示的内容
        //添加确定按钮
        alert.setButton(DialogInterface.BUTTON_POSITIVE,"确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {}
        });
        alert.show();  									// 显示对话框

    }
}