문story) 안드로이드 BroadcastReceiver 사용하는 간단한 코드

package app.app1;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    TextView t1;
    Button button;

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



        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("firebase");
                sendBroadcast(intent);
            }
        });

    }


}

package app.app1;

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

/**
 * Created by Byun YB on 2017-01-07.
 */

public class BroadCast extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {

        Intent intent1 = new Intent(context, WorkActivity.class);
        intent1.putExtra("firebase", "방송을 받았다");
        intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //이게 꼭 필요하다,, 새로운 액티비를 연다? 이런 문장인듯
        context.startActivity(intent1);
    }
}

package app.app1;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

/**
 * Created by Byun YB on 2017-01-07.
 */

public class WorkActivity extends Activity {
    TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.textView);

        Intent intent = getIntent();
        textView.setText(intent.getStringExtra("firebase"));
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="app.app1">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".WorkActivity"></activity>
        <receiver android:name=".BroadCast">
            <intent-filter>
                <action android:name="firebase"></action>
            </intent-filter>
        </receiver>
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="app.app1.MainActivity">

    <TextView
        android:text="TextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="76dp"
        android:id="@+id/textView" />

    <Button
        android:text="Button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="35dp"
        android:id="@+id/button"
        android:layout_below="@+id/textView"
        android:layout_alignRight="@+id/textView"
        android:layout_alignEnd="@+id/textView" />
</RelativeLayout>