发送标准广播失败，Android8.0 Intent发送广播和启动服务

发送标准广播失败，Android8.0 Intent发送广播和启动服务

老版本《第一行代码》与原来《菜鸟教程》的发送广播写法不太适用于Android8.0，可以参考以下代码书写。

主要就是MainActivity.java中的发送广播那几行，之所以把代码全贴出来，是方便查找相对应的字段。

AndroidManifest.xml

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

MainActivity.java

package com.example.broadcasttest;

import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
    private Button button;
    @Override
    protected void onCreate(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(new Intent(MainActivity.this,MyReceiver.class));
                intent.setAction("com.example.broadcasttest.MY_BROADCAST");
                sendBroadcast(intent);

            }
        });
    }

}

MyBroadcastReceiver.java

package com.example.broadcasttest;

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

public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "接收到一条服务", Toast.LENGTH_SHORT).show();
    }
}

activity_main.xml（布局文件）

	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <Button
            android:id="@+id/button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Send Broadcast"/>
    </LinearLayout>