本地广播 localBroadcastManager Android

使用localBroadcastManager发出的广播只能在本应用程序的内部进行传递。类似于iOS的NSNotificationCenter

App应用内广播可理解为一种局部广播，广播的发送者和接收者都同属于一个App。

相比于全局广播（普通广播），App应用内广播优势体现在：安全性高 & 效率高

步骤：

1.注册广播（onResume方法内）

2.发送广播

3.收到广播

4.销毁广播（onPause方法内）

package com.fengbang.localbroadcasttest;

import android.content.BroadcastReceiver;
import android.content.Context;
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.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private IntentFilter intentFilter;
    private LocalReceiver localReceiver;
    private LocalBroadcastManager localBroadcastManager;

    private static final String TAG = "MainActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        localBroadcastManager = LocalBroadcastManager.getInstance(this);

        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent("com.fengbang.localbroadcasttest.LOCAL_BROADCAST");
                localBroadcastManager.sendBroadcast(intent);//发送广播
            }
        });

    }

    @Override
    protected void onResume() {
        super.onResume();

        intentFilter = new IntentFilter();
        intentFilter.addAction("com.fengbang.localbroadcasttest.LOCAL_BROADCAST");
        localReceiver = new LocalReceiver();
        localBroadcastManager.registerReceiver(localReceiver,intentFilter);//注册广播
    }

    @Override
    protected void onPause() {
        super.onPause();

        localBroadcastManager.unregisterReceiver(localReceiver);//销毁广播
    }

    class LocalReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d(TAG, "onReceive: 收到广播");
        }
    }
}