[Android]App之间发送和接收广播

这里使用不同模块来实现app之间的广播通信，以两个app为例，通过点击按钮来实现的~

1. broad模块 – 忽略BootCompleteReceiver和MainActivity（这是其他的~）

 步骤：

（1）创建 BroadOrderActivity，表示发送广播者

点击右下角的finish即完成创建

（BroadOrderActivity.java和在layout下的activity_broad_order.xml）

（2） 书写代码

 这部分代码如下：

BroadOrderActivity.java

package com.example.broad;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;

public class BroadOrderActivity extends AppCompatActivity implements View.OnClickListener {

    private BroadOrderReceiver broadOrderReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_broad_order);
        findViewById(R.id.btn_send_a).setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        Intent intent = new Intent("com.example.broad.BroadOrderReceiver");
        sendOrderedBroadcast(intent,"com.example.broad.BroadOrderReceiver");
    }

    @Override
    protected void onStart() {
        super.onStart();
        broadOrderReceiver = new BroadOrderReceiver();
        IntentFilter filter = new IntentFilter("com.example.broad.BroadOrderReceiver");
        registerReceiver(broadOrderReceiver,filter);
    }

    @Override
    protected void onStop() {
        super.onStop();
        unregisterReceiver(broadOrderReceiver);
    }
}

activity_broad_order.xml

（3）在同一个模块下创建一个接收者 BroadOrderReceiver

同样点击右下角的finish完成创建 

（4）接收者代码如下（在控制台打印消息表示接收到~）：

BroadOrderReceiver.java

package com.example.broad;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class BroadOrderReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("nn","BroadOrderAReceiver接收到广播");
    }
}

（5）重要的部分！我自己在这里纠结了好久，终于发现是这里的问题，才不能完成app之间通信

AndroidManifest.xml

小小提一下，主要是这里要设置用户的权限（完整代码在上面，这里就是记录一下下）：

2. broadb模块 – 在我的理解中，就是另一个app

（1）创建模块

 点击finish就完成模块的创建

（会自动生成MainActivity.java 和 activity_main.xml，只修改了MainActivity.java）

代码如下：

MainActivity.java

package com.example.broadb;

import androidx.appcompat.app.AppCompatActivity;

import android.content.IntentFilter;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    private BroadcastBReceiver broadcastBReceiver;

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

    @Override
    protected void onStart() {
        super.onStart();
        broadcastBReceiver = new BroadcastBReceiver();
        IntentFilter intentFilter = new IntentFilter("com.example.broad.BroadOrderReceiver");
        registerReceiver(broadcastBReceiver,intentFilter);
    }

    @Override
    protected void onStop() {
        super.onStop();
        unregisterReceiver(broadcastBReceiver);
    }
}

 （2）创建 BroadcastBReceiver

创建上一个模块一样~

这里就直接附上代码

BroadcastBReceiver.java

package com.example.broadb;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class BroadcastBReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("nn","BroadcastBReceiver收到广播");
    }
}

AndroidManifest.xml

3. 结果 – 成功~