Question

我正在创建一个短信应用程序，用户键入联系人和消息，然后单击按钮butenc。该按钮必须将可变电话号码和消息发送到另一个java类，其中方法接收数据并对其进行操作。 Ecc java文件是一个独立的java类，它链接到各种其他java类以对消息进行操作。我有时会得到一个stackoverflow错误，当我操作代码中的一些东西时，应用程序运行，当我点击enc按钮没有任何反应，但当我点击发送按钮时，消息被发送。我确信我在将变量传递给Ecc类时遇到了问题。我在操作系统上遇到了各种问题，但没有一个能解决问题。我所做的改变给出了我上面提到的任何一个问题。我如何克服这个问题？

SMSTest.java（主要的android活动）

package com.example.smsTest;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


@TargetApi(Build.VERSION_CODES.DONUT)
@SuppressLint("NewApi")
public class SMSTest extends Activity 
{
    public final static String SMS_Message = "com.example.SMSTest.MESSAGE";
public final static String SMS_Phone = "com.example.SMSTest.MESSAGE";
Button btnSendSMS;
Button btnEnc;
EditText txtPhoneNo;
EditText txtMessage;

Ecc ecc;

/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);        
    btnSendSMS = (Button) findViewById(R.id.btnSendSMS);
    btnEnc = (Button) findViewById(R.id.btnEnc);
    txtPhoneNo = (EditText) findViewById(R.id.txtPhoneNo);
    txtMessage = (EditText) findViewById(R.id.txtMessage);

    ecc=new Ecc(this);

    /*
    Intent sendIntent = new Intent(Intent.ACTION_VIEW);
    sendIntent.putExtra("sms_body", "Content of the SMS goes here..."); 
    sendIntent.setType("vnd.android-dir/mms-sms");
    startActivity(sendIntent);
    */

    btnEnc.setOnClickListener(new View.OnClickListener() 
    {
        public void onClick(View v) 
        {               
            String phoneNo = txtPhoneNo.getText().toString(); 
            String message = txtMessage.getText().toString();
            if (phoneNo.length()>0 && message.length()>0){
                System.out.println("details verified");
                ecc.recv(phoneNo, message);    
                Toast.makeText(getBaseContext(), 
                    "Ecc started", 
                    Toast.LENGTH_SHORT).show();
            }
        });

    btnSendSMS.setOnClickListener(new View.OnClickListener() 
    {
        public void onClick(View v) 
        {               
            String phoneNo = txtPhoneNo.getText().toString(); 
            String message = txtMessage.getText().toString();               
            if (phoneNo.length()>0 && message.length()>0)                
                sendSMS(phoneNo, message);
            else
                Toast.makeText(getBaseContext(), 
                    "Please enter both phone number and message.", 
                    Toast.LENGTH_SHORT).show();
        }
    });        
}

//---sends a SMS message to another device---
@TargetApi(Build.VERSION_CODES.DONUT)
@SuppressLint("NewApi")    
public void sendSMS(String phoneNumber, String message)
{      
    /*
    PendingIntent pi = PendingIntent.getActivity(this, 0,
            new Intent(this, test.class), 0);                
        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, pi, null);        
    */

    String SENT = "SMS_SENT";
    String DELIVERED = "SMS_DELIVERED";

    PendingIntent sentPI = PendingIntent.getBroadcast(this, 0,
        new Intent(SENT), 0);

    PendingIntent deliveredPI = PendingIntent.getBroadcast(this, 0,
        new Intent(DELIVERED), 0);

    //---when the SMS has been sent---
    registerReceiver(new BroadcastReceiver(){
        @Override
        public void onReceive(Context arg0, Intent arg1) {
            switch (getResultCode())
            {
                case Activity.RESULT_OK:
                    Toast.makeText(getBaseContext(), "SMS sent", 
                            Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                    Toast.makeText(getBaseContext(), "Generic      failure", 
                            Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_NO_SERVICE:
                    Toast.makeText(getBaseContext(), "No service", 
                            Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_NULL_PDU:
                    Toast.makeText(getBaseContext(), "Null PDU", 
                            Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_RADIO_OFF:
                    Toast.makeText(getBaseContext(), "Radio off", 
                            Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    }, new IntentFilter(SENT));

    //---when the SMS has been delivered---
    registerReceiver(new BroadcastReceiver(){
        @TargetApi(Build.VERSION_CODES.DONUT)
        @SuppressLint("NewApi")
        @Override
        public void onReceive(Context arg0, Intent arg1) {
            switch (getResultCode())
            {
                case Activity.RESULT_OK:
                    Toast.makeText(getBaseContext(), "SMS delivered", 
                            Toast.LENGTH_SHORT).show();
                    break;
                case Activity.RESULT_CANCELED:
                    Toast.makeText(getBaseContext(), "SMS not delivered", 
                            Toast.LENGTH_SHORT).show();
                            break;                  
            }
        }
    },new IntentFilter(DELIVERED));        

    SmsManager sms = SmsManager.getDefault();
    sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);               
    }  
}

这是我的另一个班级（Ecc.java）

package com.example.smsTest;
import java.util.*;
public class Ecc{

//code
private SMSTest smsTest;


// Constructor
public Ecc(SMSTest smsTest) {
    this.smsTest = smsTest;
}


public void recv(String phn, String smsg){

/*performs manipulation on phn and msg taken 
from the main activity using various other 
java files linked with it and again sends it 
back to themaina ctivities sendSMS method*/
smsTest.sendSMS(pnh,smsg)
}

//code
}

我的main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Enter the phone number of recipient"
    />     
<EditText 
    android:id="@+id/txtPhoneNo"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"        
    />
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"         
    android:text="Message"
    />     
<EditText 
    android:id="@+id/txtMessage"  
    android:layout_width="fill_parent" 
    android:layout_height="150px"
    android:gravity="top"         
    />

<Button
    android:id="@+id/btnEnc"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Ecc" />

<Button 
    android:id="@+id/btnSendSMS"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:text="Send SMS"
    />

</LinearLayout>

当我点击发送按钮时，正在发送消息但是当我点击ecc ecc类加载开始...

这是我的logcat

02-26 13:04:36.337: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:36.447: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:36.447: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:36.797: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:36.797: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.077: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.117: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.247: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.247: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.318: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.391: I/Choreographer(1265): Skipped 74 frames!  The application may be doing too much work on its main thread.
02-26 13:04:37.416: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.416: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.427: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.427: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.437: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0
02-26 13:04:37.447: W/Trace(1265): Unexpected value from nativeGetEnabledTags: 0

Answer 1

当您实例化Ecc对象时，它会创建一个SMSTest对象，创建一个Ecc对象，无限制地创建SMSTest个对象。这会产生堆栈溢出。

这可能不对。

您的Ecc课程中需要这样的内容：

// Reference to the SMSTest instance
private SMSTest smsTest;

// Constructor
public Ecc(SMSTest smsTest) {
    this.smsTest = smsTest;
}

在SMSTest中，更改

Ecc ecc=new Ecc();

到

Ecc ecc; // This variable gets initialized in onCreate()

然后，在SMSTest.onCreate()执行：

ecc=new Ecc(this);

Answer 2

欢迎使用 StackoverFlow ！

你的做法是错误的。

活动永远不会以这种方式创建。 SMSTest smstest=new SMSTest();

最好在创建Ecc对象时传递对此活动的引用，然后使用该引用调用活动中的任何方法。

Answer 3

在java类中创建静态方法并在具有类名的活动中调用它。如果要在java类中调用activity方法然后在活动中使该方法静态并通过actvity名称调用该方法，则可以反之。

无法从活动类调用java类的方法

3 个答案: