我正在创建一个应用程序，它接受用户通过 EditText 输入的字符串，将它们放入 sharedpreference 中，然后在收到短信时发送自动短信，使用来自 sharedpreference 的字符串来指示电话号码和短信将自动发送。
只要我硬编码要发送的电话号码和短信，该应用程序就可以完美运行。一旦我尝试将共享首选项中的字符串放入 SendSMS 方法中，应用程序就会崩溃，并且出现调试错误“hasUserDataHeader：false”
下面的代码是我尝试从名称 EditText 中获取字符串并将其用作要通过参数 TextMessage 发送的消息的版本（请参阅广播接收器中的这行代码）。如果我用“TextMessage”替换它，那会很好，但显然这不会使发送的文本动态
下面的代码：
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Button;
import android.app.PendingIntent;
import android.content.Intent;
import android.telephony.SmsManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.IntentFilter;
import android.widget.TextView;
import android.app.Notification;
import android.app.NotificationManager;
import android.content.SharedPreferences;
public class MainActivity extends Activity {
int notificationID = 1;
String[] excuses;
String excuseSelected;
IntentFilter intentFilter;
private SharedPreferences prefs;
private String prefName = "MyPref";
private static final String NUMBER_KEY = "number";
private static final String NAME_KEY = "name";
private static final String EXCUSE_KEY = "excuse";
private BroadcastReceiver intentReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//---gather up all the necessary user input---
prefs = getSharedPreferences(prefName, MODE_PRIVATE);
String textMessage = (String) prefs.getString(NAME_KEY, "");
sendSMS("0403579838", textMessage);
// }
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//---intent to filter for SMS messages received---
intentFilter = new IntentFilter();
intentFilter.addAction("SMS_RECEIVED_ACTION");
final Button btn1 = (Button)findViewById(R.id.buttonToggle);
excuses = getResources().getStringArray(R.array.excuses_array);
Spinner s1 = (Spinner) findViewById(R.id.spinnerExcuse);
final EditText EditTextNumber = (EditText) findViewById(R.id.editTextNumber);
final EditText EditTextName = (EditText) findViewById(R.id.editTextName);
//---Sorting the spinner view out for excuses selection---
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, excuses);
s1.setAdapter(adapter);
s1.setOnItemSelectedListener(new OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3)
{
int index = arg0.getSelectedItemPosition();
excuseSelected = excuses[index];
}
public void onNothingSelected(AdapterView<?> arg0) {}
});
//---Setting the button to toggle between on and off---
btn1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (btn1.getText().equals("Turn on"))
{
btn1.setText("Turn off");
//---register the receiver---
registerReceiver(intentReceiver, intentFilter);
//---get the SharedPreferences object---
prefs = getSharedPreferences(prefName, MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
//---set the user inputs to prefo's---
editor.putString(NUMBER_KEY, EditTextNumber.getText().toString());
editor.putString(NAME_KEY, EditTextName.getText().toString());
editor.putString(EXCUSE_KEY, excuseSelected);
}
else
{
btn1.setText("Turn on");
//---unregister the receiver---
unregisterReceiver(intentReceiver);
}
}
});
}
//---sends an SMS message to another device---
public void sendSMS(String phoneNumber, String message)
{
SmsManager sms = SmsManager.getDefault();
sms.sendTextMessage(phoneNumber, null, message, null, null);
displayNotification();
}
protected void displayNotification()
{
Intent i = new Intent(this, NotificationView.class);
i.putExtra("notificationID", notificationID);
PendingIntent pendingIntent =
PendingIntent.getActivity(this, 0, i, 0);
NotificationManager nm = (NotificationManager)
getSystemService(NOTIFICATION_SERVICE);
Notification notif = new Notification(
R.drawable.ic_launcher,
"SMS has been sent by GirlfriendMinder",
System.currentTimeMillis());
CharSequence from = "GirlfriendMinder";
CharSequence message = "SMS has been sent by GirlfriendMinder";
notif.setLatestEventInfo(this, from, message, pendingIntent);
//---100ms delay, vibrate for 250ms, pause for 100ms, and then vibrate for 500ms---
notif.vibrate = new long[] { 100, 250, 100, 500};
nm.notify(notificationID, notif);
}
@Override
protected void onDestroy() {
//---unregister the receiver---
unregisterReceiver(intentReceiver);
super.onPause();
}
}