Android---3种方式限制EditView输入字数

editText.addTextChangedListener(new TextWatcher() {   
           private CharSequence temp;   
           private boolean isEdit = true;   
           private int selectionStart ;   
           private int selectionEnd ;   
           @Override  
           public void beforeTextChanged(CharSequence s, int arg1, int arg2,   
                   int arg3) {   
               temp = s;   
           }   
              
           @Override  
           public void onTextChanged(CharSequence s, int arg1, int arg2,   
                   int arg3) {   
           }   
              
           @Override  
           public void afterTextChanged(Editable s) {   
                selectionStart = editText.getSelectionStart();   
               selectionEnd = editText.getSelectionEnd();   
               Log.i("gongbiao1",""+selectionStart);   
               if (temp.length() > Constant.TEXT_MAX) {   
                   Toast.makeText(KaguHomeActivity.this,   
                           R.string.edit_content_limit, Toast.LENGTH_SHORT)   
                           .show();   
                   s.delete(selectionStart-1, selectionEnd);   
                   int tempSelection = selectionStart;   
                   editText.setText(s);   
                   editText.setSelection(tempSelection);   
               }   
           }   
  
  
       }); 

 editText.addTextChangedListener(new TextWatcher() {
            private CharSequence temp;
            private boolean isEdit = true;
            private int selectionStart ;
            private int selectionEnd ;
            @Override
            public void beforeTextChanged(CharSequence s, int arg1, int arg2,
                    int arg3) {
                temp = s;
            }
            
            @Override
            public void onTextChanged(CharSequence s, int arg1, int arg2,
                    int arg3) {
            }
            
            @Override
            public void afterTextChanged(Editable s) {
                 selectionStart = editText.getSelectionStart();
                selectionEnd = editText.getSelectionEnd();
                Log.i("gongbiao1",""+selectionStart);
                if (temp.length() > Constant.TEXT_MAX) {
                    Toast.makeText(KaguHomeActivity.this,
                            R.string.edit_content_limit, Toast.LENGTH_SHORT)
                            .show();
                    s.delete(selectionStart-1, selectionEnd);
                    int tempSelection = selectionStart;
                    editText.setText(s);
                    editText.setSelection(tempSelection);
                }
            }

        });
 

方法二：利用InputFilter

    

editText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(100)});  //其中100最大输入字数 

editText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(100)});  //其中100最大输入字数

方法三：在XML中设定

Xml代码 
<EditText  
    .   
    .   
    .   
    Android:maxLength="100"  
/>