我是Android编程的绝对初学者,我有以下代码:
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<img src="https://cdn0.iconfinder.com/data/icons/gcons-2/24/laptop1-16.png" />
我几乎没有问题:
1)为什么我有错误&#34;无法解决方法&#34; findViewById(int)&#34;&#34;在部分
public class First_Fragment extends Fragment {
View myView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
myView = inflater.inflate(R.layout.first_layout, container, false);
return myView;
}
public boolean executeCommand(){
System.out.println("executeCommand");
Runtime runtime = Runtime.getRuntime();
try
{
Process mIpAddrProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
int mExitValue = mIpAddrProcess.waitFor();
System.out.println(" mExitValue " + mExitValue);
if(mExitValue==0){
return true;
}else{
return false;
}
TextView tv = (TextView)findViewById(R.id.textView2);
tv.setText(mExitValue);
}
catch (InterruptedException ignore)
{
ignore.printStackTrace();
System.out.println(" Exception:"+ignore);
}
catch (IOException e)
{
e.printStackTrace();
System.out.println(" Exception:"+e);
}
return false;
}
}
将其更改为&#34; ... view.findViewById(...&#34;不起作用(&#34;无法解析方法&#34;查看(整数)&#34;&#34 ;
2)当我想要那个&#34;标签&#34;作为&#34; ping&#34;
的文本输出3)如何使用&#34; ping&#34;仅导出该部分如果服务器没有响应(超时或等),它会将该标签的文本更改为其他内容等#34;服务器关闭&#34;)
如果你帮助我,我会很高兴,我只想再说一遍,我是绝对的初学者,所以请不要怪我。谢谢!
答案 0 :(得分:1)
试试这个:
tv = (TextView) myView.findViewById(R.id.textView2);
此外,片段需要定义正在使用其组件的视图。这里myView是布局膨胀的视图,因此我们需要通过以下方式定义该片段使用myView的textview:
var myfunc = {
copy: function(message){
window.setTimeout(function(){
console.log(message);
},1000);
return this;
}
};
myfunc.copy('hello').copy('world');
// wait a second then log:
// hello
// wait until first function completion (1000ms), wait a second then log:
// world