TextView 的字数监听

textView.addTextChangedListener(new TextWatcher() {  
		    //对输入窗口的字数监听
		  
		    @Override  
		    public void beforeTextChanged(CharSequence s, int start, int count,  
		            int after) {  
		    }  
		  
		    @Override  
		    public void onTextChanged(CharSequence s, int start, int before,  
		            int count) {  
		    	String content = textView.getText().toString();  
		    	send_msg_top.setText(content.length() + "/140" );
		    }

			@Override
			public void afterTextChanged(Editable arg0) {
				// TODO Auto-generated method stub
				
			}  
		  
		});