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当编辑文本字段（数字输入）留空时，我在处理错误时遇到了一些麻烦。所以我想要的是将edittext的值存储到一个字符串中，然后如果该值不是“”，我将转换为整数并执行一些操作。但是，该应用程序甚至在转换为整数行之前就停止了。有什么建议么？这是我的代码：

        bConfirm.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            //number input edit field
            etInputValue = etInput.getText().toString();

            if (etInputValue.equals("")){
                AlertDialog.Builder inpte = new AlertDialog.Builder(ManualInputActivity.this);
                inpte.setTitle("Error");
                inpte
                    .setMessage("Please Fill in all Fields")
                    .setCancelable(false)
                    .setNegativeButton("Ok", new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog, int id1) {
                            // TODO Auto-generated method stub
                            dialog.cancel();
                            Intent i4 = new Intent(getApplicationContext(), MainActivity.class);
                            startActivity(i4);
                        }
                    });
                AlertDialog inptDia = inpte.create();
                inptDia.show();
            }
else{//Do some calculations}

日志猫：

    10-21 21:18:00.725: E/AndroidRuntime(1025): FATAL EXCEPTION: main
10-21 21:18:00.725: E/AndroidRuntime(1025): java.lang.NumberFormatException: Invalid int: ""
10-21 21:18:00.725: E/AndroidRuntime(1025):     at java.lang.Integer.invalidInt(Integer.java:138)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at java.lang.Integer.parseInt(Integer.java:359)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at java.lang.Integer.parseInt(Integer.java:332)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at java.lang.Integer.valueOf(Integer.java:490)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at com.diatrack.app.ManualInputActivity$2.onClick(ManualInputActivity.java:97)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at android.view.View.performClick(View.java:4084)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at android.view.View$PerformClick.run(View.java:16966)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at android.os.Handler.handleCallback(Handler.java:615)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at android.os.Handler.dispatchMessage(Handler.java:92)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at android.os.Looper.loop(Looper.java:137)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at android.app.ActivityThread.main(ActivityThread.java:4745)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at java.lang.reflect.Method.invokeNative(Native Method)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at java.lang.reflect.Method.invoke(Method.java:511)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-21 21:18:00.725: E/AndroidRuntime(1025):     at dalvik.system.NativeStart.main(Native Method)
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