android 编辑文本通过焦点事件隐藏hint属性

	renwu_lr=(EditText) findViewById(R.id.renwu_lr); 
		//输入文本框的焦点事件 
		renwu_lr.setOnFocusChangeListener(new OnFocusChangeListener(){ 
			@Override 
			public void onFocusChange(View v, boolean hasFocus) { 
				EditText edit=(EditText)v; 
			   if(hasFocus){ 
				  edit.setHint("");				    
			   }				 
			}			 
		});