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我有兩個TextView，兩個EditText和兩個Buttons。當按鈕被點擊而沒有在文本框中輸入任何值時，我想設置DialogBox或Toast。我有兩個刺，s和s1。如果s和s1或者s或s1沒有被輸入到edittext中，我必須得到一個敬酒。我寫了一個敬酒的代碼，但它不能正常工作！
你能幫我嗎？驗證爲空編輯文本字段不起作用
這是我的代碼：
public class MainActivity extends Activity implements OnClickListener {
TextView name1;
TextView name2;
Button click;
Button samegender;
EditText boyname;
EditText girlname;
ImageView imgview;
AnimationDrawable frameanimation;
Bitmap bmp;
String bread;
String cheese;
char sauce;
MediaPlayer song;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//fullscreen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow(). setFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN , WindowManager LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
name1 = (TextView) findViewById(R.id.tvname1);
name2 = (TextView) findViewById(R.id.tvname2);
click = (Button) findViewById(R.id.btclick);
samegender=(Button) findViewById(R.id.btsamegender);
samegender.setOnClickListener(this);
boyname = (EditText) findViewById(R.id.etboyname);
boyname.setInputType(InputType.TYPE_CLASS_TEXT);
girlname = (EditText) findViewById(R.id.etgirlname);
girlname.setInputType(InputType.TYPE_CLASS_TEXT);
imgview=(ImageView)findViewById(R.id.imageanim);
imgview.setBackgroundResource(R.drawable.myanim);
frameanimation=(AnimationDrawable) imgview.getBackground();
frameanimation.start();
click.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btclick:
DataInputStream dis = new DataInputStream(System.in);
int i,
j = 0;
int d = 0;
int totlen;
String flames;
int[] newarr = new int[20];
int[] newarr1 = new int[20];
System.out.println("enter name");
String s = boyname.getText().toString();
StringBuffer sb = new StringBuffer(s);
char namearr[] = s.toCharArray();
System.out.println("enter name");
String s1 = girlname.getText().toString();
//code for toast//
//if s nd s1 is empty then execute this else executee the rest//
if((s==" ") && (s1==" "))
{
Toast.makeText(getBaseContext(),"cnt b empty" ,Toast.LENGTH_SHORT). show();
}
else
{
StringBuffer sb1 = new StringBuffer(s1);
System.out.println("the string1=" + s);
System.out.println("the string2=" + s1);
char namearr1[] = s1.toCharArray();
try {
for (i = 0; i < sb.length(); i++) {
for (j = 0, d = 0; j < sb1.length(); j++) {
if (sb.charAt(i) == sb1.charAt(j)) {
sb.deleteCharAt(i);
System.out.println("the buff=" + sb);
sb1.deleteCharAt(j);
System.out.println("the buff=" + sb1);
i = 0;
break;
}
}
}
} catch (Exception e) {
System.out.println(e);
}
sb.length();
System.out.println("string length=" + sb.length());
sb1.length();
System.out.println("string length=" + sb1.length());
int len = sb.length() + sb1.length();
totlen = len - 1;
System.out.println("string length=" + totlen);
String str = "flames";
StringBuffer sb2 = new StringBuffer(str);
int index = 0;
str.length();
int length = str.length();
System.out.println("the length of flames is=" + str.length());
while (index < length) {
char letter = str.charAt(index);
System.out.println(letter);
index = index + 1;
}
System.out.println(sb2.length());
int m = 0,
n = 0;
for (m = 0;;) {
if (n == totlen) {
sb2.deleteCharAt(m);
System.out.println(sb2 + " m:" + m + " n:" + n);
System.out.println(sb2);
n = 0;
m--;
} else {
n++;
}
if (m == sb2.length() - 1) {
m = 0;
} else {
m++;
}
if (sb2.length() == 1) {
break;
}
}
char res = sb2.charAt(0);
System.out.println("the final char is=" + res);
String bread = boyname.getText().toString();
String cheese = girlname.getText().toString();
char sauce = res;
Bundle basket = new Bundle();
basket.putString("name1", bread);
basket.putString("name2", cheese);
basket.putChar("ans", sauce);
Intent a = new Intent(MainActivity.this, ResultActivity.class);
a.putExtras(basket);
startActivity(a);
}
break;
可能重複（http://stackoverflow.com/questions/14250791/comparing-string- [比較串來串不工作當字符串從SQLiteDatabase來到] to-string-not-working-when-the-string-came-from-sqlitedatabase） – codeMagic