android输入框输入价格，小数点后留两位简单实现

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正好碰到这种情况，就记录下来吧，实现起来很简单

xml文件里加个靠右限制就把光标移到右边去了，初始值设置成0.00

<EditText        android:id="@+id/id_edit"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:gravity="center_vertical|right"         android:numeric="integer"        android:text="0.00" />

然后代码里实现

代码中要注意不要在字符未改变时对editText.setText,否则会报 StackOverflowError

public class MainActivity extends Activity {EditText edit;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);edit = (EditText) findViewById(R.id.id_edit);          edit.addTextChangedListener(new TextWatcher() {              private boolean isChanged = false;                @Override              public void onTextChanged(CharSequence s, int start, int before,                      int count) {                  // TODO Auto-generated method stub              }                @Override              public void beforeTextChanged(CharSequence s, int start, int count,                      int after) {                  // TODO Auto-generated method stub              }                @Override              public void afterTextChanged(Editable s) {                  // TODO Auto-generated method stub                  if (isChanged) {// ----->如果字符未改变则返回                      return;                  }                  String str = s.toString();                    isChanged = true;                  String cuttedStr = str;                  /* 删除字符串中的dot */                  for (int i = str.length() - 1; i >= 0; i--) {                      char c = str.charAt(i);                      if ('.' == c) {                          cuttedStr = str.substring(0, i) + str.substring(i + 1);                          break;                      }                  }                  /* 删除前面多余的0 */                  int NUM = cuttedStr.length();                 int zeroIndex = -1;                for (int i = 0; i < NUM - 2; i++) {                  char c = cuttedStr.charAt(i);                  if (c != '0') {                  zeroIndex = i;                break;                }else if(i == NUM - 3){                zeroIndex = i;                break;                }                }                  if(zeroIndex != -1){                cuttedStr = cuttedStr.substring(zeroIndex);                }                /* 不足3位补0 */                  if (cuttedStr.length() < 3) {                      cuttedStr = "0" + cuttedStr;                  }                  /* 加上dot，以显示小数点后两位 */                  cuttedStr = cuttedStr.substring(0, cuttedStr.length() - 2)                          + "." + cuttedStr.substring(cuttedStr.length() - 2);                                edit.setText(cuttedStr);                    edit.setSelection(edit.length());                  isChanged = false;              }          });  }@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}