所以我有一个微调器需要使用assets文件夹中的HTML文件填充WebView。我的代码看起来很下降，但显然不起作用。我将附加Java和错误。
我知道我在这里犯错，需要了解我做错了什么。
public class atcSectionWeb extends Activity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;
Spinner spLoadFrom;
private ArrayAdapter<CharSequence> 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<CharSequence>(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的：
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$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-28 23:40:09.438: E/AndroidRuntime(584): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-28 23:40:09.438: E/AndroidRuntime(584): at dalvik.system.NativeStart.main(Native Method)
错误：
07-29 01:04:58.290: E/AndroidRuntime(532): FATAL EXCEPTION: main
07-29 01:04:58.290: E/AndroidRuntime(532): java.lang.NullPointerException
07-29 01:04:58.290: E/AndroidRuntime(532): at com.assistant.atcSectionWeb$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)
答案 0 :(得分：1)
粘贴应用程序的整个代码只是为了您的目的。
package asdasd.adasd.ad;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;
public class AsdasdasActivity extends Activity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;
Spinner spLoadFrom;
private ArrayAdapter<CharSequence> spinnerArrayAdapter;
String name[] = { "1.html", "2.html", "3.html"};
String displayName[] = {"1st Name", "2nd Name", "3rd name" };
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mProgressDialog = new ProgressDialog(AsdasdasActivity.this);
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
spLoadFrom = (Spinner) findViewById(R.id.Spinner02);
spinnerArrayAdapter = new ArrayAdapter<CharSequence>(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);
WebView wv = (WebView)findViewById(R.id.webView1);
wv.getSettings().setJavaScriptEnabled(true);
/* wv.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
});
*/
wv.loadUrl("file:///android_asset/htmlfileMine.html");
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();
}
});
}
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(
AsdasdasActivity.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) {
WebView wv = (WebView)findViewById(R.id.webView1);
wv.getSettings().setJavaScriptEnabled(true);
wv.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
});
wv.loadUrl("file:///android_asset/"+name[position]);
}
public void onNothingSelected(AdapterView<?> arg0) {
}
}
}
/// XML LAYOUT
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Spinner
android:id="@+id/Spinner02"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<ProgressBar
android:id="@+id/progressBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/atcSubmitweb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<Button
android:id="@+id/atcBacksecweb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
<WebView
android:id="@+id/webView1"
android:layout_width="300dp"
android:layout_height="300dp" />
</LinearLayout>
感谢。
答案 1 :(得分：1)
//call that class on button click evevnt
WebDialog dialog =new WebDialog(this,"file:///android_asset/index.html");
dialog.show();
//Put this class into your package
public class WebDialog extends Dialog
{
static final int BLUE = 0xFF6D84B4;
static final float[] DIMENSIONS_DIFF_LANDSCAPE =
{ 20, 60 };
static final float[] DIMENSIONS_DIFF_PORTRAIT =
{ 40, 60 };
static final FrameLayout.LayoutParams FILL = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
static final int MARGIN = 4;
static final int PADDING = 2;
static final String DISPLAY_STRING = "touch";
private String mUrl;
// private DialogListener mListener;
private ProgressDialog mSpinner;
private WebView mWebView;
private LinearLayout mContent;
private TextView mTitle;
public WebDialog(Context context, String url)
{
super(context);
mUrl = url;
}
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
mSpinner = new ProgressDialog(getContext());
mSpinner.requestWindowFeature(Window.FEATURE_NO_TITLE);
mSpinner.setMessage("Loading...");
mContent = new LinearLayout(getContext());
mContent.setOrientation(LinearLayout.VERTICAL);
setUpTitle();
setUpWebView();
Display display = getWindow().getWindowManager().getDefaultDisplay();
final float scale = getContext().getResources().getDisplayMetrics().density;
int orientation = getContext().getResources().getConfiguration().orientation;
float[] dimensions = (orientation == Configuration.ORIENTATION_LANDSCAPE) ? DIMENSIONS_DIFF_LANDSCAPE : DIMENSIONS_DIFF_PORTRAIT;
addContentView(mContent, new LinearLayout.LayoutParams(display.getWidth() - ((int) (dimensions[0] * scale + 0.5f)), display.getHeight() - ((int) (dimensions[1] * scale + 0.5f))));
}
private void setUpTitle()
{
requestWindowFeature(Window.FEATURE_NO_TITLE);
Drawable icon = getContext().getResources().getDrawable(R.drawable.ic_launcher);
mTitle = new TextView(getContext());
mTitle.setText("Website");
mTitle.setTextColor(Color.WHITE);
mTitle.setTypeface(Typeface.DEFAULT_BOLD);
mTitle.setBackgroundColor(BLUE);
mTitle.setPadding(MARGIN + PADDING, MARGIN, MARGIN, MARGIN);
// mTitle.setCompoundDrawablePadding(MARGIN + PADDING);
// mTitle.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null);
mContent.addView(mTitle);
}
private void setUpWebView()
{
mWebView = new WebView(getContext());
mWebView.setVerticalScrollBarEnabled(false);
mWebView.setHorizontalScrollBarEnabled(false);
mWebView.setWebViewClient(new WebDialog.DialogWebViewClient());
mWebView.getSettings().setJavaScriptEnabled(true);
System.out.println(" mURL = "+mUrl);
mWebView.loadUrl(mUrl);
mWebView.setLayoutParams(FILL);
mContent.addView(mWebView);
}
private class DialogWebViewClient extends WebViewClient
{
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)
{
super.onReceivedError(view, errorCode, description, failingUrl);
WebDialog.this.dismiss();
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
super.onPageStarted(view, url, favicon);
mSpinner.show();
}
@Override
public void onPageFinished(WebView view, String url)
{
super.onPageFinished(view, url);
String title = mWebView.getTitle();
if (title != null && title.length() > 0)
{
mTitle.setText(title);
}
mSpinner.dismiss();
}
}
}