Question

我试图让我的AlertDialog框发送消息。为此，我在对话框的按钮上使用了SmsManagers。我创建的对话框使用自定义布局。我想要的是，当我点击“确定”按钮时，会将一条消息发送到我在SmsManager中声明的预定义数字。相反，当我单击“确定”按钮时，应用程序崩溃

AlertDialog代码框：

public class MainActivity extends Activity implements OnClickListener {
Button addnew, dialog;
ListView lvInb;
ArrayAdapter<String> adapter;
int count = 0;
EditText editSMS;
SharedPreferences prefs=null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ListView lvInb = (ListView) findViewById(R.id.lvInb);
    addnew = (Button)findViewById(R.id.btnaddnew);
    addnew.setOnClickListener(this);
    dialog = (Button)findViewById(R.id.btnproperty);
    dialog.setOnClickListener(this);

    editSMS = (EditText) findViewById(R.id.editSMS);
    prefs = PreferenceManager.getDefaultSharedPreferences(this);
    count=prefs.getInt("count", 0);
    for(int i=0;i<count;i++){
        Button myButton = new Button(this);
        myButton.setOnClickListener(this);
        myButton.setText("New Button");
        myButton.setId(count);
        LinearLayout ll = (LinearLayout)findViewById(R.id.layout1);
        LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        ll.addView(myButton, lp);
    }
    lvInb = (ListView) findViewById(R.id.lvInb);
    lvInb.setOnCreateContextMenuListener(this);
    if(fetchInbox()!=null)
    {
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_activated_1 , fetchInbox());
        lvInb.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        lvInb.setAdapter(adapter);
    }
}

public ArrayList<String> fetchInbox()
{
     ArrayList<String> sms = new ArrayList<String>();
     Uri uriSms = Uri.parse("content://sms/inbox");
     Cursor cr = getContentResolver().query(uriSms, new String[]{"_id", "address", "date", "body"},null,null,null);
     cr.moveToFirst();
        while  (cr.moveToNext())
        {
             sms.add(cr.getString(1)+"\n"+cr.getString(3)+"\n");
        }
        return sms;


    }





@Override
public void onClick(View v) {
    if(v == dialog)
    {


        AlertDialog.Builder alertDialog2 = new AlertDialog.Builder(MainActivity.this);
        alertDialog2.setTitle("Message");
        alertDialog2.setMessage("Enter Related Text");
        final EditText input = new EditText(MainActivity.this);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);
        input.setLayoutParams(lp);
        alertDialog2.setView(input);
        alertDialog2.setPositiveButton("Ok",new DialogInterface.OnClickListener(){
            public void onClick(DialogInterface dialog, int which){

                String phoneNo = "111";
                 String sms = editSMS.getText().toString();
                 try {
                         SmsManager smsManager = SmsManager.getDefault();
                         smsManager.sendTextMessage(phoneNo, null, sms, null, null);
                         Toast.makeText(getApplicationContext(), "SMS Sent!",Toast.LENGTH_LONG).show();


                 } catch (Exception e) {
                     Toast.makeText(getApplicationContext(),"SMS failed, please try again later!",Toast.LENGTH_LONG).show();
                     e.printStackTrace();
                 }

            }


        });
    alertDialog2.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which){
            Toast.makeText(getApplicationContext(), "Reverting Changes", Toast.LENGTH_SHORT).show();
            dialog.cancel();

        }
    });
    alertDialog2.show();

    }


    if(v == addnew)
    {

        Button myButton = new Button(this);
        myButton.setText("New Button");
        LinearLayout ll = (LinearLayout)findViewById(R.id.layout1);
        LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        ll.addView(myButton, lp);
        count++;
        Editor editor = prefs.edit();
        editor.putInt("count", count);
        editor.commit();
    }


}

}

此外，logcat显示如下错误：

Shutting down VM
W/dalvikvm(2537): threadid=1: thread exiting with uncaught exception (group=0xb3a3bb90)
FATAL EXCEPTION: main
Process: com.example.helloworld, PID: 2470
java.lang.NullPointerException
com.example.helloworld.MainActivity$1.onClick(MainActivity.java:198)
com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
android.os.Handler.dispatchMessage(Handler.java:102)
android.app.ActivityThread.main(ActivityThread.java:4998 at java.lang.reflect.Method.invokeNative(Native Method)
java.lang.reflect.Method.invoke(Method.java:515)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
dalvik.system.NativeStart.main(Native Method)

Answer 1

请删除第alertDialog2.show();行

并使用这些行

AlertDialog alertDialog = alertDialog2.create();

                // show it
                alertDialog.show();

也不要在清单

添加权限

<uses-permission android:name="android.permission.SEND_SMS"></uses-permission>

Answer 2

尝试在EditText MainActivity内OnCreate

中初始化

editSMS = (EditText) findViewById(R.id.idname);

，如下所示

editSMS

为你{{1}}

Answer 3

String sms = editSMS.getText（）。toString（）;

将此更改为

String sms = input.getText（）。toString（）;

Answer 4

消息长度可能是问题所在。尝试使用sendMultipartTextMessage()方法而不是sendTextMessage()。以下是我的示例代码：

    private static void sendMessage(String message){

    String number = m_Text;

    try {
        SmsManager smsManager = SmsManager.getDefault();
        //smsManager.sendTextMessage(number, null, message, null, null);
        ArrayList<String> messageParts = smsManager.divideMessage(message);

        smsManager.sendMultipartTextMessage(number, null, messageParts, null, null);
        Toast.makeText(sContext, "Message Sent",
                Toast.LENGTH_LONG).show();
    } catch (Exception ex) {
        Toast.makeText(sContext,ex.getMessage(),
                Toast.LENGTH_LONG).show();
        ex.printStackTrace();
    }
}

AlertDialog框发送消息

4 个答案: