限定EditText只能输入两位小数的两种方式

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一，布局文件

    <EditText        android:id="@+id/num_et"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:numeric="decimal"/>    <EditText        android:id="@+id/num_et2"        android:layout_below="@id/num_et"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:numeric="decimal"/>

二，java文件

/** * 限定EditText只能输入最多两位小数 * @author Administrator * */public class MainActivity extends ActionBarActivity {private EditText num_et;private EditText num_et2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);num_et = (EditText) findViewById(R.id.num_et);num_et2 = (EditText) findViewById(R.id.num_et2);/** * 第一种方法 */num_et.addTextChangedListener(new TextWatcher() {             @Override            public void onTextChanged(CharSequence s, int start, int before,                    int count) {                if (s.toString().contains(".")) {                    if (s.length() - 1 - s.toString().indexOf(".") > 2) {                        s = s.toString().subSequence(0,                                s.toString().indexOf(".") + 3);                        num_et.setText(s);                        num_et.setSelection(s.length());                    }                }                if (s.toString().trim().substring(0).equals(".")) {                    s = "0" + s;                    num_et.setText(s);                    num_et.setSelection(2);                }                 if (s.toString().startsWith("0")                        && s.toString().trim().length() > 1) {                    if (!s.toString().substring(1, 2).equals(".")) {                    num_et.setText(s.subSequence(0, 1));                    num_et.setSelection(1);                        return;                    }                }            }             @Override            public void beforeTextChanged(CharSequence s, int start, int count,                    int after) {             }             @Override            public void afterTextChanged(Editable s) {                // TODO Auto-generated method stub                             }         });/** * 第二种方法 */num_et2.addTextChangedListener(new TextWatcher()   {      public void afterTextChanged(Editable edt)       {          String temp = edt.toString();          int posDot = temp.indexOf(".");          if (posDot <= 0) return;          if (temp.length() - posDot - 1 > 2)          {              edt.delete(posDot + 3, posDot + 4);          }      }      public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {}      public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {}  });}}

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