我试图构建一个最多占用6个整数然后将其转换为单词的程序，不幸的是，当我尝试运行时，我无法确定我是做对还是错。它强制关闭。
这是我的MainActivity.java
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
final EditText numbers = (EditText) findViewById(R.id.editText1);
String numberz =numbers.getText().toString();
final long number = Long.parseLong(numberz);
Button btnConvert = (Button) findViewById(R.id.button1);
btnConvert.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
String returnz = Words.convert(number);
} });
}}
这是我单击按钮Words.java时应该调用的类：
import android.support.v7.app.ActionBarActivity;
import android.widget.EditText;
public class Words extends ActionBarActivity {
final EditText result = (EditText) findViewById(R.id.editText2);
private static final String[] tensNames = {
"",
" ten",
" twenty",
" thirty",
" forty",
" fifty",
" sixty",
" seventy",
" eighty",
" ninety"
};
private static final String[] numNames = {
"",
" one",
" two",
" three",
" four",
" five",
" six",
" seven",
" eight",
" nine",
" ten",
" eleven",
" twelve",
" thirteen",
" fourteen",
" fifteen",
" sixteen",
" seventeen",
" eighteen",
" nineteen"
};
private Words() {}
private static String convertLessThanOneThousand(int number) {
String soFar;
if (number % 100 < 20){
soFar = numNames[number % 100];
number /= 100;
}
else {
soFar = numNames[number % 10];
number /= 10;
soFar = tensNames[number % 10] + soFar;
number /= 10;
}
if (number == 0) return soFar;
return numNames[number] + " hundred" + soFar;
}
public static String convert(long number) {
// 0 to 999 999 999 999
if (number == 0) { return "zero"; }
String snumber = Long.toString(number);
// pad with "0"
String mask = "000000000000";
DecimalFormat df = new DecimalFormat(mask);
snumber = df.format(number);
// XXXnnnnnnnnn
int billions = Integer.parseInt(snumber.substring(0,3));
// nnnXXXnnnnnn
int millions = Integer.parseInt(snumber.substring(3,6));
// nnnnnnXXXnnn
int hundredThousands = Integer.parseInt(snumber.substring(6,9));
// nnnnnnnnnXXX
int thousands = Integer.parseInt(snumber.substring(9,12));
String tradBillions;
switch (billions) {
case 0:
tradBillions = "";
break;
case 1 :
tradBillions = convertLessThanOneThousand(billions)
+ " billion ";
break;
default :
tradBillions = convertLessThanOneThousand(billions)
+ " billion ";
}
String result = tradBillions;
String tradMillions;
switch (millions) {
case 0:
tradMillions = "";
break;
case 1 :
tradMillions = convertLessThanOneThousand(millions)
+ " million ";
break;
default :
tradMillions = convertLessThanOneThousand(millions)
+ " million ";
}
result = result + tradMillions;
String tradHundredThousands;
switch (hundredThousands) {
case 0:
tradHundredThousands = "";
break;
case 1 :
tradHundredThousands = "one thousand ";
break;
default :
tradHundredThousands = convertLessThanOneThousand(hundredThousands)
+ " thousand ";
}
result = result + tradHundredThousands;
String tradThousand;
tradThousand = convertLessThanOneThousand(thousands);
result = result + tradThousand;
// remove extra spaces!
return result.replaceAll("^\\s+", "").replaceAll("\\b\\s{2,}\\b", " ");}
public void main(String[] args) {
result.setText("*** " + Words.convert(0));
result.setText("*** " + Words.convert(1));
result.setText("*** " + Words.convert(16));
result.setText("*** " + Words.convert(100));
result.setText("*** " + Words.convert(118));
result.setText("*** " + Words.convert(200));
result.setText("*** " + Words.convert(219));
result.setText("*** " + Words.convert(800));
result.setText("*** " + Words.convert(801));
result.setText("*** " + Words.convert(1316));
result.setText("*** " + Words.convert(1000000));
result.setText("*** " + Words.convert(2000000));
result.setText("*** " + Words.convert(3000200));
result.setText("*** " + Words.convert(700000));
result.setText("*** " + Words.convert(9000000));
result.setText("*** " + Words.convert(9001000));
result.setText("*** " + Words.convert(123456789));
result.setText("*** " + Words.convert(2147483647));
result.setText("*** " + Words.convert(3000000010L));
}}
我的logcat：
04-22 02:18:05.144: D/dalvikvm(1066): GC_FOR_ALLOC freed 109K, 6% free 3078K/3256K, paused 30ms, total 32ms
04-22 02:18:05.334: D/gralloc_goldfish(1066): Emulator without GPU emulation detected.
04-22 02:18:09.134: I/Choreographer(1066): Skipped 78 frames! The application may be doing too much work on its main thread.
04-22 02:18:21.704: I/Choreographer(1066): Skipped 37 frames! The application may be doing too much work on its main thread.
04-22 02:51:00.024: I/Choreographer(1066): Skipped 33 frames! The application may be doing too much work on its main thread.
04-22 03:00:00.054: I/Choreographer(1066): Skipped 40 frames! The application may be doing too much work on its main thread.
04-22 03:00:01.084: I/Choreographer(1066): Skipped 46 frames! The application may be doing too much work on its main thread.
04-22 03:27:10.474: I/Choreographer(1066): Skipped 121 frames! The application may be doing too much work on its main thread.
04-22 03:29:35.064: D/AndroidRuntime(1122): Shutting down VM
04-22 03:29:35.064: W/dalvikvm(1122): threadid=1: thread exiting with uncaught exception (group=0xb2abfba8)
04-22 03:29:35.094: E/AndroidRuntime(1122): FATAL EXCEPTION: main
04-22 03:29:35.094: E/AndroidRuntime(1122): Process: com.example.torres, PID: 1122
04-22 03:29:35.094: E/AndroidRuntime(1122): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.torres/com.example.torres.MainActivity}: java.lang.NumberFormatException: Invalid long: ""
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.os.Handler.dispatchMessage(Handler.java:102)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.os.Looper.loop(Looper.java:136)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-22 03:29:35.094: E/AndroidRuntime(1122): at java.lang.reflect.Method.invokeNative(Native Method)
04-22 03:29:35.094: E/AndroidRuntime(1122): at java.lang.reflect.Method.invoke(Method.java:515)
04-22 03:29:35.094: E/AndroidRuntime(1122): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-22 03:29:35.094: E/AndroidRuntime(1122): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-22 03:29:35.094: E/AndroidRuntime(1122): at dalvik.system.NativeStart.main(Native Method)
04-22 03:29:35.094: E/AndroidRuntime(1122): Caused by: java.lang.NumberFormatException: Invalid long: ""
04-22 03:29:35.094: E/AndroidRuntime(1122): at java.lang.Long.invalidLong(Long.java:124)
04-22 03:29:35.094: E/AndroidRuntime(1122): at java.lang.Long.parseLong(Long.java:345)
04-22 03:29:35.094: E/AndroidRuntime(1122): at java.lang.Long.parseLong(Long.java:318)
04-22 03:29:35.094: E/AndroidRuntime(1122): at com.example.torres.MainActivity.onCreate(MainActivity.java:19)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.app.Activity.performCreate(Activity.java:5231)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-22 03:29:35.094: E/AndroidRuntime(1122): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-22 03:29:35.094: E/AndroidRuntime(1122): ... 11 more
04-22 03:29:35.134: D/dalvikvm(1122): GC_FOR_ALLOC freed 100K, 6% free 3087K/3256K, paused 39ms, total 43ms
答案 0 :(得分：0)
应用程序启动时，您的numberz变量为null。试试这个....
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
final EditText numbers = (EditText) findViewById(R.id.editText1);
Button btnConvert = (Button) findViewById(R.id.button1);
btnConvert.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
String numberz =numbers.getText().toString();
try {
final long number = Long.parseLong(numberz);
String returnz = Words.convert(number);
} catch ( NumberFormatException e) {
//Toast.makeToast("illegal number or empty number" , toast.long)
}
}
});
}
}
答案 1 :(得分：0)
String numberz =numbers.getText().toString();
将在numberz="";类中返回convert(和Words}方法，结果为NumberFormatException : Invalid Long。因此，您必须在onClickListener()按钮中编写以下代码。
btnConvert.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0) {
String numberz =numbers.getText().toString();
try {
final long number = Long.parseLong(numberz);
String returnz = Words.convert(number);
} catch ( NumberFormatException e) {
//Toast.makeToast("illegal number or empty number" , toast.long)
}
}
});