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直接贴代码吧 _ok.setClickable(false); // 初始化不可点击 _ok.setEnabled(false); _edit = (EditText)findViewById(R.id.fb_status_eidt); //主要是监听器里接口的实现 _edit.addTextChangedListener(new TextWatcher(){ @Override public void afterTextChanged(Editable s) { // 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 onTextChanged(CharSequence s, int start, int before, int count) { // TODO Auto-generated method stub //关键是这里,监听输入的字符串,如果大于零,则可点击,enable. if(s.length()>0){ _ok.setClickable(true); _ok.setEnabled(true); }else{ _ok.setClickable(false); _ok.setEnabled(false); } } }); 下面是selector(btn_bg_ok.xml)的内容,不同状态下,button的颜色不同 <?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_focused="true" android:drawable="@drawable/d_btbg_over" /> <item android:state_pressed="true" android:drawable="@drawable/d_btbg_over" /> <item android:state_selected="true" android:drawable="@drawable/d_btbg_over" /> <item android:state_enabled="false" android:drawable="@drawable/d_btbg_over"/> <item android:state_enabled="true" android:drawable="@drawable/d_btbg_out"/> <item android:drawable="@drawable/d_btbg_out" /> </selector> button关联btn_bg_ok.xml <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/fb_status_ok" android:text="@string/str_status_ok" android:textColor="#ffffffff" android:background="@drawable/btn_bg_ok" android:layout_marginRight="3dip" android:layout_marginLeft="3dip"/>

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