我有一些问题，我无法在模拟器中重建，但我不断收到错误报告，在安卓市场，我不知道如何解决…其他任何可能看到它的人都是伟大的
有时这个报告
java.lang.NullPointerException
at android.webkit.WebViewDatabase.getCacheTotalSize(WebViewDatabase.java:734)
at android.webkit.CacheManager.trimCacheIfNeeded(CacheManager.java:548)
at android.webkit.WebViewWorker.handleMessage(WebViewWorker.java:190)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.os.HandlerThread.run(HandlerThread.java:60)
有时这份报告
java.lang.RuntimeException: Unable to start activity ComponentInfo{polis.koll/polis.koll.WebPageLoader}: java.lang.IllegalArgumentException: provider==null
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2737)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2753)
at android.app.ActivityThread.access$2500(ActivityThread.java:129)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2107)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4701)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: provider==null
at android.location.LocationManager.requestLocationUpdates(LocationManager.java:625)
at polis.koll.WebPageLoader.getLocation(WebPageLoader.java:54)
at polis.koll.WebPageLoader.onCreate(WebPageLoader.java:70)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2701)
这是我的密码
public class WebPageLoader extends Activity implements LocationListener{
public static String Android_ID = null;
final Activity activity = this;
private Location mostRecentLocation;
private void CheckEnableGPS(){
String provider = Settings.Secure.getString(getContentResolver(),
Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if(!provider.equals("")){
//GPS Enabled
getLocation();
}else{
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
}
private void getLocation() {
String provider = Settings.Secure.getString(getContentResolver(),
Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if(!provider.equals("")){
LocationManager locationManager =
(LocationManager)getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
String bestprovider = locationManager.getBestProvider(criteria,true);
locationManager.requestLocationUpdates(bestprovider, 1, 500, this);
mostRecentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}else{
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
}
@Override
public void onCreate(Bundle savedInstanceState)
{
//AdManager.setTestDevices( new String[] { AdManager.TEST_EMULATOR } );
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.main);
getLocation();
Android_ID = Secure.getString(getContentResolver(), Secure.ANDROID_ID);
WebView webView = (WebView) findViewById(R.id.webView);
webView.getSettings().setJavaScriptEnabled(true);
/** Allows JavaScript calls to access application resources **/
webView.addJavascriptInterface(new JavaScriptInterface(), "android16");
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress)
{
activity.setTitle("Letar poliskontroller");
activity.setProgress(progress * 100);
if(progress == 100)
activity.setTitle(R.string.app_name);
}
});
webView.setWebViewClient(new WebViewClient() {
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)
{
// Handle the error
}
// Testade att ta bort denna override för att få market länkar att fungera
// @Override
// public boolean shouldOverrideUrlLoading(WebView view, String url)
// {
// view.loadUrl(url);
// return true;
// }
});
if (Locale.getDefault().getLanguage().equals("sv")){
//webView.loadUrl("file:///android_asset/android.html");
webView.loadUrl("file:///android_asset/findgps_sv.html");
}else{
//webView.loadUrl("http://m.bryggplatsen.se/android/polis/index.php");
//webView.loadUrl("file:///android_asset/android_en.html");
webView.loadUrl("file:///android_asset/findgps_en.html");
}
}
/** Sets up the interface for getting access to Latitude and Longitude data from device
**/
private class JavaScriptInterface {
public double getLatitude(){
return mostRecentLocation != null ? mostRecentLocation.getLatitude() : Double.NaN;
}
public double getLongitude(){
return mostRecentLocation != null ? mostRecentLocation.getLongitude() : Double.NaN;
}
public String getAndroid_ID(){
return Android_ID;
}
public void sharethisapp(){
startActivity(Intent.createChooser(sharespotIntent(), "Share this warning"));
}
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
getLocation();
//CheckEnableGPS();
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
getLocation();
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
getLocation();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
getLocation();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuItem item = menu.add("Shut down");
item.setIcon(R.drawable.exit);
item = menu.add("Share");
item.setIcon(R.drawable.m_share);
item = menu.add("Fix GPS");
item.setIcon(R.drawable.globe);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getTitle() == "Shut down") {
System.exit(0);
finish();
}
if (item.getTitle() == "Fix GPS") {
getLocation();
}
if (item.getTitle() == "Share") {
if (Locale.getDefault().getLanguage().equals("sv")){
startActivity(Intent.createChooser(shareIntent(), "Dela denna app"));
}else{
startActivity(Intent.createChooser(shareIntent(), "Share this app"));
}
}
return true;
}
private Intent shareIntent() {
Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
shareIntent.setType("text/plain");
if (Locale.getDefault().getLanguage().equals("sv")){
shareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Testa denna android app...");
return shareIntent.putExtra(android.content.Intent.EXTRA_TEXT, "index.php");
}else{
shareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Try this cool android app...");
return shareIntent.putExtra(android.content.Intent.EXTRA_TEXT, "index_en.php");
}
}
private Intent sharespotIntent() {
Intent sharespotIntent = new Intent(android.content.Intent.ACTION_SEND);
sharespotIntent.setType("text/plain");
if (Locale.getDefault().getLanguage().equals("sv")){
sharespotIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, " la just upp en ny varning i appen Polisradar");
return sharespotIntent.putExtra(android.content.Intent.EXTRA_TEXT, "warn.php?lat=" + mostRecentLocation.getLatitude() + "&lng=" + mostRecentLocation.getLongitude() + "");
}else{
sharespotIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, " just added a new warning in the app Policeradar");
return sharespotIntent.putExtra(android.content.Intent.EXTRA_TEXT, "warn_en.php?lat=" + mostRecentLocation.getLatitude() + "&lng=" + mostRecentLocation.getLongitude() + "");
}
}
}
最佳答案
如果请求的名称不在数据库中，那么settings.secure.getstring（）方法可以返回null。不过，我不知道为什么找不到settings.secure.location_providers_allowed。但是，在检查提供程序不是空字符串之前，您的代码不会（在getLocation（）中）检查该提供程序不是空字符串。我想这就是你第二个例外的原因。
框架中看似随机的错误也可能是由于试图在不支持代码中某些内容的操作系统版本上运行应用程序造成的。确保您的代码是根据清单中设置的minsdkversion编译的，而不仅仅是targetsdkversion。
关于android - 获取位置时java.lang.NullPointerException，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/4702450/