广播接收者案例_开机启动

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

public class BootReceiver extends BroadcastReceiver {

    //当手机重启会执行这个方法
    @Override
    public void onReceive(Context context, Intent intent) {

        //开启mainActivity
        Intent intent2 = new Intent(context,MainActivity.class);
        
        //☆ 如果在广播里面开启Activity 要设置一个任务栈环境
        intent2.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        
        
        //在广播接收者里面开启activity
        context.startActivity(intent2);
        
        
        
    }

}

　　　　　<receiver android:name="com.itheima.bootreceiver.BootReceiver">
            
            <intent-filter >
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
            </intent-filter>
        </receiver>

09-08 03:26:15.926: E/AndroidRuntime(1152): java.lang.RuntimeException: Unable to start receiver com.itheima.bootreceiver.BootReceiver: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?