方法：

Question

在Gosms应用程序中，我们希望在手机桌面上看到新收到的短信，我想在自己的应用程序中拥有此功能。我尝试简单使用并在AlertDialog中显示onStop()，就像这样：

protected void onStop() {
        builder.setMessage("Test message")
                .setCancelable(true)
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                });
        AlertDialog alert = builder.create();
        alert.show();
        super.onStop();
        Log.e(" onStop","");
    }

但这可能无法正常工作。之后，我试图通过服务显示此对话框。各种方式都不适合我。请帮助我有这种能力

截图： enter image description here

Answer 1

您需要检测您的应用当前是在后台还是前台。

方法：

添加BroadcastReceiver以收听传入消息
检查您的应用是否在前台
如果是在后台，请显示对话框

代码段：

实现更改应用程序状态的自定义Application类

public class MyApplication extends Application {

  public static boolean isActivityVisible() {
    return activityVisible;
  }  

  public static void activityResumed() {
    activityVisible = true;
  }

  public static void activityPaused() {
    activityVisible = false;
  }

  private static boolean activityVisible;
}

将onPause和onResume添加到项目中的每个活动以更改应用程序状态：

@Override
protected void onResume() {
  super.onResume();
  MyApplication.activityResumed();
}

@Override
protected void onPause() {
  super.onPause();
  MyApplication.activityPaused();
}

添加权限并在清单中注册接收者：

<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
<uses-permission android:name="android.permission.READ_SMS"></uses-permission>
     <receiver android:name=".SMSBroadcastReceiver">
            <intent-filter>
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            </intent-filter>
        </receiver>

SMSBroadcastReceiver：

public class SMSBroadcastReceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    Bundle bundle = intent.getExtras();
    SmsMessage[] msgs = null;
    String str = "no message received";
    if(bundle != null){

        Object[] pdus = (Object[]) bundle.get("pdus");
        msgs = new SmsMessage[pdus.length];
        for(int i=0; i<msgs.length;i++){

            msgs[i]= SmsMessage.createFromPdu((byte[])pdus[i]);
            str += "SMS from Phone No: " +msgs[i].getOriginatingAddress();
            str +="\n"+"Message is: ";
            str += msgs[i].getMessageBody().toString();
            str +="\n";
        }

        Toast.makeText(context, str, Toast.LENGTH_SHORT).show(); //contact number and the message

     // Now as soon as you get the message check whether your application is running or not and show the dialog

        if(!MyAppliction.isActivityVisible())
       {
               // code to show a dialog box
       }
    }
}}

与GoSMS一样的Android显示对话框

1 个答案:

方法：

代码段：