java广播接收器在后台不工作
我正在创建一个应用程序,可以检测输入短信到安卓手机,但应用程序在后台不工作
这是我的主要活动。在java中,我请求用户允许我阅读短信
package com.example.times;
import 安卓x.appcompat.app.AppCompatActivity;
import 安卓x.core.app.ActivityCompat;
import 安卓x.core.content.ContextCompat;
import 安卓.Manifest;
import 安卓.content.pm.PackageManager;
import 安卓.os.Bundle;
import 安卓.widget.Switch;
import 安卓.widget.Toast;
public class MainActivity extends AppCompatActivity {
private static final int READ_SMS_PERMISSION=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECEIVE_SMS) != PackageManager.PERMISSION_GRANTED)
{
if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.RECEIVE_SMS))
{
// do nothing
}
else
{
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECEIVE_SMS}, READ_SMS_PERMISSION);
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)
{
switch(requestCode)
{
case READ_SMS_PERMISSION:
{
if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED)
{
Toast.makeText(this, "Thankyou for granting access", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(this, "No problem", Toast.LENGTH_LONG).show();
}
}
}
}
}
这是myreciver。在java中,我检测到输入短信,并用该消息制作吐司
当应用程序被打开时,它工作正常,但当我退出应用程序时,它没有检测到任何短信
package com.example.times;
import 安卓.content.BroadcastReceiver;
import 安卓.content.Context;
import 安卓.content.Intent;
import 安卓.os.Build;
import 安卓.os.Bundle;
import 安卓.telephony.SmsMessage;
import 安卓.util.Log;
import 安卓.widget.Toast;
public class MyReceiver extends BroadcastReceiver {
private static final String SMS_RECEIVED="安卓.provider.Telephony.SMS_RECEIVED";
private static final String TAG="SmsBroadcastReceiver";
String msg, phoneNo ="";
@Override
public void onReceive(Context context, Intent intent) {
// TODO: This method is called when the BroadcastReceiver is receiving
// an Intent broadcast.
// throw new UnsupportedOperationException("Not yet implemented");
Log.i(TAG, "Intent Received: " +intent.getAction());
if (intent.getAction()==SMS_RECEIVED)
{
Bundle dataBundle = intent.getExtras();
if (dataBundle!=null)
{
Object[] mypdu=(Object[])dataBundle.get("pdus");
final SmsMessage[] message = new SmsMessage[mypdu.length];
for (int i =0; i<mypdu.length; i++)
{
if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.M)
{
String format= dataBundle.getString("format");
message[i] = SmsMessage.createFromPdu((byte[])mypdu[i],format);
}
else
{
message[i] = SmsMessage.createFromPdu((byte[]) mypdu[i]);
}
msg =message[i].getMessageBody();
phoneNo= message[i].getOriginatingAddress();
}
Toast.makeText(context, "Message: " +msg +"\nNumber: " +phoneNo, Toast.LENGTH_SHORT).show();
}
}
}
}
告诉我我是否做错了什么
# 1 楼答案
确保你的Android Mainfest中有这些。xml
接下来呢
编辑
当你的应用程序关闭或处于后台时,你需要一个意向服务来阅读短信
Intent Service - Run in Background
步骤: