安卓 spinner html,html - Android - Load WebView from Asset using a Spinner - Stack Overflow

So I have a spinner that needs to populate a WebView using an HTML file located in the assets folder. I have my code that looks descent but obviously doesn't work. I will attach the Java and the error.

I know I'm making mistakes here and need to learn what I am doing wrong.

public class atcSectionWeb extends Activity {

public static final int DIALOG_DOWNLOAD_PROGRESS = 0;

private ProgressDialog mProgressDialog;

Spinner spLoadFrom;

private ArrayAdapter spinnerArrayAdapter;

String name[] = { "1.html", "2.html", "3.html", "etc.html" };

String displayName[] = {"1st Name", "2nd Name", "3rd name", "And So On" };

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.atcsectionweb);

mProgressDialog = new ProgressDialog(atcSectionWeb.this);

mProgressDialog.setIndeterminate(false);

mProgressDialog.setMax(100);

mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

spLoadFrom = (Spinner) findViewById(R.id.Spinner02);

spinnerArrayAdapter = new ArrayAdapter(this,

android.R.layout.simple_spinner_item, displayName);

spinnerArrayAdapter

.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

spLoadFrom.setAdapter(spinnerArrayAdapter);

SpinnerListener spListener = new SpinnerListener();

spLoadFrom.setOnItemSelectedListener(spListener);

Button atcBack = (Button) findViewById(R.id.atcBacksecweb);

atcBack.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// TODO Auto-generated method stub

setResult(RESULT_OK);

finish();

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

MenuInflater inflater = getMenuInflater();

inflater.inflate(R.menu.menu2, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.atcAbout2:

Intent atcAboutWeb = new Intent(atcSectionWeb.this,

atcAboutWeb.class);

startActivity(atcAboutWeb);

break;

case R.id.atcContact2:

emailme();

break;

}

return true;

}

private void emailme() {

// TODO Auto-generated method stub

try{

String domsEmail = "";

String message = "Insert Message Here";

String myemail[] = { domsEmail };

Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);

emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, myemail);

emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "");

emailIntent.setType("plain/text");

emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, message);

startActivity(emailIntent);

}catch (Exception e) {

Toast.makeText(

atcSectionWeb.this,

"No email application is available, please download one from Play store.",

Toast.LENGTH_LONG).show();

}

}

public class SpinnerListener implements OnItemSelectedListener {

public SpinnerListener() {

}

public void onItemSelected(AdapterView> arg0, View arg1,

final int position, long arg2) {

Button atcSection = (Button) findViewById(R.id.atcSubmitweb);

atcSection.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

WebView wv = (WebView)findViewById(R.id.ctiWebView);

wv.setWebViewClient(new WebViewClient() {

@Override

public boolean shouldOverrideUrlLoading(WebView view, String url)

{

view.loadUrl(url);

return true;

}

});

wv.loadUrl("file:///android_asset/" + position);

}

});

}

public void onNothingSelected(AdapterView> arg0) {

}

}

}

LogCat:

07-28 23:40:09.438: E/AndroidRuntime(584): FATAL EXCEPTION: main

07-28 23:40:09.438: E/AndroidRuntime(584): java.lang.NullPointerException

07-28 23:40:09.438: E/AndroidRuntime(584): at com.assistant.atcSectionWeb$SpinnerListener$1.onClick(atcSectionWeb.java:240)

07-28 23:40:09.438: E/AndroidRuntime(584): at android.view.View.performClick(View.java:2485)

07-28 23:40:09.438: E/AndroidRuntime(584): at android.view.View$PerformClick.run(View.java:9080)

07-28 23:40:09.438: E/AndroidRuntime(584): at android.os.Handler.handleCallback(Handler.java:587)

07-28 23:40:09.438: E/AndroidRuntime(584): at android.os.Handler.dispatchMessage(Handler.java:92)

07-28 23:40:09.438: E/AndroidRuntime(584): at android.os.Looper.loop(Looper.java:123)

07-28 23:40:09.438: E/AndroidRuntime(584): at android.app.ActivityThread.main(ActivityThread.java:3683)

07-28 23:40:09.438: E/AndroidRuntime(584): at java.lang.reflect.Method.invokeNative(Native Method)

07-28 23:40:09.438: E/AndroidRuntime(584): at java.lang.reflect.Method.invoke(Method.java:507)

07-28 23:40:09.438: E/AndroidRuntime(584): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)

07-28 23:40:09.438: E/AndroidRuntime(584): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

07-28 23:40:09.438: E/AndroidRuntime(584): at dalvik.system.NativeStart.main(Native Method)

Error after copying SALMAN's code:

07-29 01:04:58.290: E/AndroidRuntime(532): FATAL EXCEPTION: main

07-29 01:04:58.290: E/AndroidRuntime(532): java.lang.NullPointerException

07-29 01:04:58.290: E/AndroidRuntime(532): at com.assistant.atcSectionWeb$SpinnerListener.onItemSelected(atcSectionWeb.java:236)

07-29 01:04:58.290: E/AndroidRuntime(532): at android.widget.AdapterView.fireOnSelected(AdapterView.java:871)

07-29 01:04:58.290: E/AndroidRuntime(532): at android.widget.AdapterView.access$200(AdapterView.java:42)

07-29 01:04:58.290: E/AndroidRuntime(532): at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:837)

07-29 01:04:58.290: E/AndroidRuntime(532): at android.os.Handler.handleCallback(Handler.java:587)

07-29 01:04:58.290: E/AndroidRuntime(532): at android.os.Handler.dispatchMessage(Handler.java:92)

07-29 01:04:58.290: E/AndroidRuntime(532): at android.os.Looper.loop(Looper.java:123)

07-29 01:04:58.290: E/AndroidRuntime(532): at android.app.ActivityThread.main(ActivityThread.java:3683)

07-29 01:04:58.290: E/AndroidRuntime(532): at java.lang.reflect.Method.invokeNative(Native Method)

07-29 01:04:58.290: E/AndroidRuntime(532): at java.lang.reflect.Method.invoke(Method.java:507)

07-29 01:04:58.290: E/AndroidRuntime(532): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)

07-29 01:04:58.290: E/AndroidRuntime(532): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

07-29 01:04:58.290: E/AndroidRuntime(532): at dalvik.system.NativeStart.main(Native Method)