广播和复习部分知识

最新推荐文章于 2024-12-22 23:45:43 发布

原创最新推荐文章于 2024-12-22 23:45:43 发布 · 222 阅读

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本文详细介绍如何在Android中使用BroadcastReceiver接收广播并触发通知，同时展示了如何通过广播接收器改变图片资源，深入解析了权限配置及应用实例。

Day10.17作业

广播和通知

Main

package com.example.day1017homwork;

import android.content.Intent;
import android.content.IntentFilter;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private Button bt;
    private MyReceiver myReceiver;
    private LocalBroadcastManager instance;


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

        //初始化
        bt = (Button) findViewById(R.id.bt);

        //创建一个本地的广播
        instance = LocalBroadcastManager.getInstance(this);

        myReceiver = new MyReceiver();
        //注册一个动态的广播
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("com.ludan.egg");
        //进行注册
        instance.registerReceiver(myReceiver,intentFilter);

        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("com.ludan.egg");
                instance.sendBroadcast(intent);
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //销毁
        instance.unregisterReceiver(myReceiver);
    }
}

创建一个继承BroadcastReceiver的类（邮件直接创建）和通知

package com.example.day1017homwork;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals("com.ludan.egg")){
            Toast.makeText(context, "广播发送成功", Toast.LENGTH_SHORT).show();
            //发送通知
            //创建构造者
            Notification.Builder builder = new Notification.Builder(context);
            //设置属性
            builder.setSmallIcon(R.mipmap.ic_launcher);
            builder.setContentTitle("广播发送的消息");
            builder.setContentText("你家猪跑了");

            //设置声音
            builder.setDefaults(Notification.DEFAULT_ALL);

            //设置弹出
            builder.setPriority(Notification.PRIORITY_MAX);

            //创建这个对象
            Notification build = builder.build();
            NotificationManager systemService = (NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);
            systemService.notify(1,build);

        }

    }
}

通知和改变图片

Main

package com.example.app2;

import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

    public class MainActivity extends AppCompatActivity {

    private Button bt;
    private ImageView iv;
    private  Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
        }
    };

    private MyReceiver myReceiver;
    private IntentFilter intentFilter;

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

        bt = (Button) findViewById(R.id.bt);
        iv = (ImageView) findViewById(R.id.iv);

        myReceiver= new MyReceiver(handler,iv);

        intentFilter = new IntentFilter();
        intentFilter.addAction("com.ludan.111");
        registerReceiver(myReceiver,intentFilter);

        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("com.ludan.111");
                sendBroadcast(intent);
            }
        });

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(myReceiver);
    }
}

创建一个继承BroadcastReceiver的类（邮件直接创建）和改变图片

package com.example.app2;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.widget.ImageView;



public class MyReceiver extends BroadcastReceiver {

    private Handler handler;
    private ImageView imageView;

    public MyReceiver(Handler handler, ImageView imageView) {
        this.handler = handler;
        this.imageView = imageView;
    }

    @Override
    public void onReceive(Context context, final Intent intent) {
        String action = intent.getAction();
        if (action.equals("com.ludan.111")){
             handler.post(new Runnable() {
                 @Override
                 public void run() {
                            imageView.setImageResource(R.drawable.a);
                 }
             });
        }
    }
}

复习

权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.app3">
    <uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_CONTACTS"></uses-permission>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".Main2Activity"></activity>
        <activity android:name=".RegisterActivity" />
        <activity android:name=".LogiActivity" />
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>