[转载]设置TabHost的透明标签-Android开发问题解答-eoe Android开发者社区_Android开发论坛.
图1
图2
理想的情况应该是图1的效果,但是发现background中使用png图片默认还是会有黑色底色,请问应该如何达到透明的效果
布局如下
< span class = "com" > <!--?xml version="1.0" encoding="utf-8"?--> </ span >< span class = "pln" > </ span > |
代码如下
<span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >app</span><span class = "pun" >.</span><span class = "typ" >TabActivity</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >content</span><span class = "pun" >.</span><span class = "typ" >Intent</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >os</span><span class = "pun" >.</span><span class = "typ" >Bundle</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >view</span><span class = "pun" >.</span><span class = "typ" >View</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >view</span><span class = "pun" >.</span><span class = "typ" >View</span><span class = "pun" >.</span><span class = "typ" >OnFocusChangeListener</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >widget</span><span class = "pun" >.</span><span class = "typ" >RadioButton</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >widget</span><span class = "pun" >.</span><span class = "typ" >RadioGroup</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >widget</span><span class = "pun" >.</span><span class = "typ" >RadioGroup</span><span class = "pun" >.</span><span class = "typ" >OnCheckedChangeListener</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > import </span><span class = "pln" > android</span><span class = "pun" >.</span><span class = "pln" >widget</span><span class = "pun" >.</span><span class = "typ" >TabHost</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > public </span><span class = "pln" > </span><span class = "kwd" > class </span><span class = "pln" > </span><span class = "typ" >TabHostActivity</span><span class = "pln" > </span><span class = "kwd" > extends </span><span class = "pln" > </span><span class = "typ" >TabActivity</span><span class = "pln" > </span><span class = "kwd" > implements </span><span class = "pln" > </span><span class = "typ" >OnCheckedChangeListener</span><span class = "pun" >,</span><span class = "pln" > </span><span class = "typ" >OnFocusChangeListener</span><span class = "pln" > </span><span class = "pun" >{</span><span class = "pln" > </span><span class = "kwd" > private </span><span class = "pln" > </span><span class = "typ" >TabHost</span><span class = "pln" > tabHost</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > private </span><span class = "pln" > </span><span class = "typ" >RadioGroup</span><span class = "pln" > tabs</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > private </span><span class = "pln" > </span><span class = "typ" >RadioButton</span><span class = "pln" > btn_login</span><span class = "pun" >,</span><span class = "pln" > btn_register</span><span class = "pun" >,</span><span class = "pln" > btn_forgot</span><span class = "pun" >;</span><span class = "pln" > </span><span class = "lit" > @Override </span><span class = "pln" > </span><span class = "kwd" > protected </span><span class = "pln" > </span><span class = "kwd" > void </span><span class = "pln" > onCreate</span><span class = "pun" >(</span><span class = "typ" >Bundle</span><span class = "pln" > savedInstanceState</span><span class = "pun" >)</span><span class = "pln" > </span><span class = "pun" >{</span><span class = "pln" > </span><span class = "kwd" > super </span><span class = "pun" >.</span><span class = "pln" >onCreate</span><span class = "pun" >(</span><span class = "pln" >savedInstanceState</span><span class = "pun" >);</span><span class = "pln" > setContentView</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "pln" >layout</span><span class = "pun" >.</span><span class = "pln" >tabhost_layout</span><span class = "pun" >);</span><span class = "pln" > tabs </span><span class = "pun" >=</span><span class = "pln" > </span><span class = "pun" >(</span><span class = "typ" >RadioGroup</span><span class = "pun" >)</span><span class = "pln" > findViewById</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >main_tabs</span><span class = "pun" >);</span><span class = "pln" > btn_login </span><span class = "pun" >=</span><span class = "pln" > </span><span class = "pun" >(</span><span class = "typ" >RadioButton</span><span class = "pun" >)</span><span class = "pln" > findViewById</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio01</span><span class = "pun" >);</span><span class = "pln" > btn_register </span><span class = "pun" >=</span><span class = "pln" > </span><span class = "pun" >(</span><span class = "typ" >RadioButton</span><span class = "pun" >)</span><span class = "pln" > findViewById</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio02</span><span class = "pun" >);</span><span class = "pln" > btn_forgot </span><span class = "pun" >=</span><span class = "pln" > </span><span class = "pun" >(</span><span class = "typ" >RadioButton</span><span class = "pun" >)</span><span class = "pln" > findViewById</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio03</span><span class = "pun" >);</span><span class = "pln" > btn_login</span><span class = "pun" >.</span><span class = "pln" >setOnFocusChangeListener</span><span class = "pun" >(</span><span class = "kwd" > this </span><span class = "pun" >);</span><span class = "pln" > btn_register</span><span class = "pun" >.</span><span class = "pln" >setOnFocusChangeListener</span><span class = "pun" >(</span><span class = "kwd" > this </span><span class = "pun" >);</span><span class = "pln" > btn_forgot</span><span class = "pun" >.</span><span class = "pln" >setOnFocusChangeListener</span><span class = "pun" >(</span><span class = "kwd" > this </span><span class = "pun" >);</span><span class = "pln" > tabs</span><span class = "pun" >.</span><span class = "pln" >setOnCheckedChangeListener</span><span class = "pun" >(</span><span class = "kwd" > this </span><span class = "pun" >);</span><span class = "pln" > tabHost </span><span class = "pun" >=</span><span class = "pln" > getTabHost</span><span class = "pun" >();</span><span class = "pln" > tabHost</span><span class = "pun" >.</span><span class = "pln" >addTab</span><span class = "pun" >(</span><span class = "pln" >tabHost </span><span class = "pun" >.</span><span class = "pln" >newTabSpec</span><span class = "pun" >(</span><span class = "str" > "login" </span><span class = "pun" >)</span><span class = "pln" > </span><span class = "pun" >.</span><span class = "pln" >setIndicator</span><span class = "pun" >(</span><span class = "pln" >getResources</span><span class = "pun" >().</span><span class = "pln" >getString</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "kwd" >string</span><span class = "pun" >.</span><span class = "pln" >login</span><span class = "pun" >),</span><span class = "pln" > getResources</span><span class = "pun" >().</span><span class = "pln" >getDrawable</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "pln" >drawable</span><span class = "pun" >.</span><span class = "pln" >login</span><span class = "pun" >))</span><span class = "pln" > </span><span class = "pun" >.</span><span class = "pln" >setContent</span><span class = "pun" >(</span><span class = "kwd" > new </span><span class = "pln" > </span><span class = "typ" >Intent</span><span class = "pun" >(</span><span class = "kwd" > this </span><span class = "pun" >,</span><span class = "pln" > </span><span class = "typ" >LoginActivity</span><span class = "pun" >.</span><span class = "kwd" > class </span><span class = "pun" >)));</span><span class = "pln" > tabHost</span><span class = "pun" >.</span><span class = "pln" >addTab</span><span class = "pun" >(</span><span class = "pln" >tabHost </span><span class = "pun" >.</span><span class = "pln" >newTabSpec</span><span class = "pun" >(</span><span class = "str" > "register" </span><span class = "pun" >)</span><span class = "pln" > </span><span class = "pun" >.</span><span class = "pln" >setIndicator</span><span class = "pun" >(</span><span class = "pln" >getResources</span><span class = "pun" >().</span><span class = "pln" >getString</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "kwd" >string</span><span class = "pun" >.</span><span class = "kwd" >register</span><span class = "pun" >),</span><span class = "pln" > getResources</span><span class = "pun" >().</span><span class = "pln" >getDrawable</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "pln" >drawable</span><span class = "pun" >.</span><span class = "kwd" >register</span><span class = "pun" >))</span><span class = "pln" > </span><span class = "pun" >.</span><span class = "pln" >setContent</span><span class = "pun" >(</span><span class = "kwd" > new </span><span class = "pln" > </span><span class = "typ" >Intent</span><span class = "pun" >(</span><span class = "kwd" > this </span><span class = "pun" >,</span><span class = "pln" > </span><span class = "typ" >RegisterActivity</span><span class = "pun" >.</span><span class = "kwd" > class </span><span class = "pun" >)));</span><span class = "pln" > tabHost</span><span class = "pun" >.</span><span class = "pln" >addTab</span><span class = "pun" >(</span><span class = "pln" >tabHost </span><span class = "pun" >.</span><span class = "pln" >newTabSpec</span><span class = "pun" >(</span><span class = "str" > "forgot" </span><span class = "pun" >)</span><span class = "pln" > </span><span class = "pun" >.</span><span class = "pln" >setIndicator</span><span class = "pun" >(</span><span class = "pln" >getResources</span><span class = "pun" >().</span><span class = "pln" >getString</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "kwd" >string</span><span class = "pun" >.</span><span class = "pln" >forgotPass</span><span class = "pun" >),</span><span class = "pln" > getResources</span><span class = "pun" >().</span><span class = "pln" >getDrawable</span><span class = "pun" >(</span><span class = "pln" >R</span><span class = "pun" >.</span><span class = "pln" >drawable</span><span class = "pun" >.</span><span class = "pln" >forgot_password</span><span class = "pun" >))</span><span class = "pln" > </span><span class = "pun" >.</span><span class = "pln" >setContent</span><span class = "pun" >(</span><span class = "kwd" > new </span><span class = "pln" > </span><span class = "typ" >Intent</span><span class = "pun" >(</span><span class = "kwd" > this </span><span class = "pun" >,</span><span class = "pln" > </span><span class = "typ" >ForgotPassActivity</span><span class = "pun" >.</span><span class = "kwd" > class </span><span class = "pun" >)));</span><span class = "pln" > </span><span class = "pun" >}</span><span class = "pln" > </span><span class = "lit" > @Override </span><span class = "pln" > </span><span class = "kwd" > public </span><span class = "pln" > </span><span class = "kwd" > void </span><span class = "pln" > onFocusChange</span><span class = "pun" >(</span><span class = "typ" >View</span><span class = "pln" > v</span><span class = "pun" >,</span><span class = "pln" > </span><span class = "kwd" > boolean </span><span class = "pln" > hasFocus</span><span class = "pun" >)</span><span class = "pln" > </span><span class = "pun" >{</span><span class = "pln" > </span><span class = "kwd" > switch </span><span class = "pln" > </span><span class = "pun" >(</span><span class = "pln" >v</span><span class = "pun" >.</span><span class = "pln" >getId</span><span class = "pun" >())</span><span class = "pln" > </span><span class = "pun" >{</span><span class = "pln" > </span><span class = "kwd" > case </span><span class = "pln" > R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio01</span><span class = "pun" >:</span><span class = "pln" > </span><span class = "kwd" > break </span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > case </span><span class = "pln" > R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio02</span><span class = "pun" >:</span><span class = "pln" > </span><span class = "kwd" > break </span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > case </span><span class = "pln" > R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio03</span><span class = "pun" >:</span><span class = "pln" > </span><span class = "kwd" > break </span><span class = "pun" >;</span><span class = "pln" > </span><span class = "pun" >}</span><span class = "pln" > </span><span class = "pun" >}</span><span class = "pln" > </span><span class = "lit" > @Override </span><span class = "pln" > </span><span class = "kwd" > public </span><span class = "pln" > </span><span class = "kwd" > void </span><span class = "pln" > onCheckedChanged</span><span class = "pun" >(</span><span class = "typ" >RadioGroup</span><span class = "pln" > </span><span class = "kwd" >group</span><span class = "pun" >,</span><span class = "pln" > </span><span class = "kwd" > int </span><span class = "pln" > checkedId</span><span class = "pun" >)</span><span class = "pln" > </span><span class = "pun" >{</span><span class = "pln" > </span><span class = "kwd" > switch </span><span class = "pln" > </span><span class = "pun" >(</span><span class = "pln" >checkedId</span><span class = "pun" >)</span><span class = "pln" > </span><span class = "pun" >{</span><span class = "pln" > </span><span class = "kwd" > case </span><span class = "pln" > R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio01</span><span class = "pun" >:</span><span class = "pln" > tabHost</span><span class = "pun" >.</span><span class = "pln" >setCurrentTabByTag</span><span class = "pun" >(</span><span class = "str" > "login" </span><span class = "pun" >);</span><span class = "pln" > </span><span class = "kwd" > break </span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > case </span><span class = "pln" > R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio02</span><span class = "pun" >:</span><span class = "pln" > tabHost</span><span class = "pun" >.</span><span class = "pln" >setCurrentTabByTag</span><span class = "pun" >(</span><span class = "str" > "register" </span><span class = "pun" >);</span><span class = "pln" > </span><span class = "kwd" > break </span><span class = "pun" >;</span><span class = "pln" > </span><span class = "kwd" > case </span><span class = "pln" > R</span><span class = "pun" >.</span><span class = "pln" >id</span><span class = "pun" >.</span><span class = "pln" >tab_radio03</span><span class = "pun" >:</span><span class = "pln" > tabHost</span><span class = "pun" >.</span><span class = "pln" >setCurrentTabByTag</span><span class = "pun" >(</span><span class = "str" > "forgot" </span><span class = "pun" >);</span><span class = "pln" > </span><span class = "kwd" > break </span><span class = "pun" >;</span><span class = "pln" > </span><span class = "pun" >}</span><span class = "pln" > </span><span class = "pun" >}</span><span class = "pln" > </span><span class = "pun" >}</span> |