我正在使用一个片段,它应该显示一个网页视图。当我试图从使用它的类实例化它时,我在我的logcat中得到以下警告。
02-21 23:26:46.843: W/System.err(32468): android.content.ActivityNotFoundException: Unable to find explicit activity class {get.scanner/get.scanner.WebFrag}; have you declared this activity in your AndroidManifest.xml?
我只是在学习如何使用片段,我从来没有尝试过在我的清单中声明它们,我也没有看到任何地方告诉你这样做。
下面是WebFrag类。
public class WebFrag extends Fragment{
private WebView viewer = null;
// if we weren't just using the compat library, we could use WebViewFragment
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
viewer = (WebView) inflater
.inflate(R.layout.webview, container, false);
WebSettings settings = viewer.getSettings();
settings.setJavaScriptEnabled(true);
settings.setDefaultZoom(ZoomDensity.FAR);
return viewer;
}
@Override
public void onPause() {
if (viewer != null) {
viewer.onPause();
}
super.onPause();
}
@Override
public void onResume() {
super.onResume();
if (viewer != null) {
viewer.onResume();
}
}
public void updateUrl(String newUrl) {
if (viewer != null) {
viewer.loadUrl(newUrl);
}
}
}
编辑:将WebFrag作为活动添加到清单中会导致以下错误
02-22 00:17:55.711: E/AndroidRuntime(2524): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{get.scanner/get.scanner.WebFrag}: java.lang.ClassCastException: get.scanner.WebFrag
编辑:这里是我尝试使用我的类的主要片段活动
public class GetScannerActivity extends FragmentActivity {
private String mUrl = "http://www.yahoo.com/";
Button scanButton;
Button paint;
Button compTrans;
String yurl = "http://www.yahoo.com/";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
compTrans = (Button) findViewById(R.id.checkCurrentDeals);
compTrans.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
WebFrag viewer = (WebFrag) getSupportFragmentManager()
.findFragmentById(R.id.web_frag);
try{
if (viewer == null || !viewer.isInLayout()) {
Intent showContent = new Intent(getApplicationContext(),
WebFrag.class);
showContent.setData(Uri.parse(yurl));
try{
startActivity(showContent);
}catch(ActivityNotFoundException e){
e.printStackTrace();
}
} else {
viewer.updateUrl(yurl);
}
}catch(Exception e){
e.printStackTrace();
}
}
});
}
}
https://stackoverflow.com/questions/9390752
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