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问题：编写的Android应用出现The application has stopped unexpected,Please try again
描述: Logcat是这样的..
05-25 08:57:37.636: E/AndroidRuntime(510): FATAL EXCEPTION: main
05-25 08:57:37.636: E/AndroidRuntime(510): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{sim.activity/sim.activity.SIMActivity}: java.lang.NullPointerException
05-25 08:57:37.636: E/AndroidRuntime(510): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.os.Looper.loop(Looper.java:123)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.app.ActivityThread.main(ActivityThread.java:3683)
05-25 08:57:37.636: E/AndroidRuntime(510): at java.lang.reflect.Method.invokeNative(Native Method)
05-25 08:57:37.636: E/AndroidRuntime(510): at java.lang.reflect.Method.invoke(Method.java:507)
05-25 08:57:37.636: E/AndroidRuntime(510): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-25 08:57:37.636: E/AndroidRuntime(510): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-25 08:57:37.636: E/AndroidRuntime(510): at dalvik.system.NativeStart.main(Native Method)
05-25 08:57:37.636: E/AndroidRuntime(510): Caused by: java.lang.NullPointerException
05-25 08:57:37.636: E/AndroidRuntime(510): at android.content.ContextWrapper.getResources(ContextWrapper.java:80)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.view.View.(View.java:1874)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.view.View.(View.java:1921)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.view.ViewGroup.(ViewGroup.java:292)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.widget.AbsoluteLayout.(AbsoluteLayout.java:52)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.webkit.WebView.(WebView.java:975)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.webkit.WebView.(WebView.java:958)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.webkit.WebView.(WebView.java:948)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.webkit.WebView.(WebView.java:939)
05-25 08:57:37.636: E/AndroidRuntime(510): at sim.activity.SIMActivity.(SIMActivity.java:33)
05-25 08:57:37.636: E/AndroidRuntime(510): at java.lang.Class.newInstanceImpl(Native Method)
05-25 08:57:37.636: E/AndroidRuntime(510): at java.lang.Class.newInstance(Class.java:1409)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
05-25 08:57:37.636: E/AndroidRuntime(510): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
05-25 08:57:37.636: E/AndroidRuntime(510): ... 11 more
之前出现过一次..有个String忘了加null判定..但是这次我实在找不出问题了..求帮助= =
代码还没写完..见笑=。=package sim.activity;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
public class SIMActivity extends Activity {
/** Called when the activity is first created. */
private WebView webView = new WebView(this);
private Menu menu;
private int group1 = 1;
private int group2 = 2;
private Context mContext;
private Notification mNotification;
private NotificationManager mNotificationManager;
private final static int NOTIFICATION_ID = 0x0001;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView tv = (TextView)findViewById(R.id.tv1);
TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
tm.getLine1Number();
String imei1 = tm.getDeviceId();
tm.getSubscriberId();
String imei2 ="0";
//这里为了安全起见我删掉了我的URL=-=
String url1 = "MyURL";
String Format1 = getResources().getString(R.string.imeis);
String imei = "";
int len = imei1.length();
if(len == 14){
imei = String.format(Format1,imei2,imei1);
}
else {imei = imei1;}
String urll = String.format(Format1,url1,imei);
//浏览器界面
webView.loadUrl(urll);
webView.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
setTitle("页面加载中，请稍候..." + progress + "%");
setProgress(progress * 100);
if (progress == 100) {
setTitle(R.string.app_name);
}
}
});
webView.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
});
setContentView(webView,new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
//这里为了安全起见我删掉了我的URL=-=
String httpUrl = "myURL";
StringBuffer sb = new StringBuffer();
URL urlx = null;
try{
urlx = new URL(httpUrl);
}catch(MalformedURLException e){
e.printStackTrace();
}
if (urlx != null){
try{
HttpURLConnection urlConn =
(HttpURLConnection) urlx.openConnection();
urlConn.connect();
InputStream input = urlConn.getInputStream();
InputStreamReader inputReader = new InputStreamReader(input);
BufferedReader reader = new BufferedReader(inputReader);
String inputLine = null;
while((inputLine = reader.readLine()) != null){
sb.append(inputLine).append("\n");
}
reader.close();
inputReader.close();
input.close();
urlConn.disconnect();
}catch(IOException e){
e.printStackTrace();
}
}else{
Log.i("TAG","url is null");
}
String sbstr =null;
if (sb != null){
String sbtr = sb.toString();
int sblen = sbtr.length();
int index=sbtr.lastIndexOf("|");
sbstr=sbtr.substring(index+1,sblen);
tv.setText(sbstr);
}else{
tv.setText("cannot get page");
}
if (sbstr != null){
if (sbstr == "none"){
menu.setGroupVisible(group1, false);
menu.setGroupVisible(group2, true);
}else{
menu.setGroupVisible(group1, true);
menu.setGroupVisible(group2, true);
}
}else{System.out.println("null");}
}
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(group2,1,1,"后退");
menu.add(group2,2,2,"前进");
SubMenu subMenu = menu.addSubMenu(group1, 100, 100, "系统通知");
subMenu.add(group1, 101, 101, "接收");
subMenu.add(group1, 102, 102, "不接收");
return true; }
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()){
case 1:
if(webView.canGoBack()){
webView.goBack();
return true;
}
break;
case 2:
if(webView.canGoForward()){
webView.goForward();
return true;
}
break;
case 101:
Intent mIntent = new Intent(mContext,SIMActivity.class);
mIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent mContentIntent =PendingIntent.getActivity(mContext,0, mIntent, 0);
mNotification.setLatestEventInfo(mContext, "通知", "有新的通知", mContentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mNotification);
break;
case 102:
mNotificationManager.cancel(NOTIFICATION_ID);
break;
default:
return super.onOptionsItemSelected(item);
}
return true;
}
public void setupViews(){
mContext = SIMActivity.this;
mNotification = new Notification(R.drawable.ic_launcher,"new notification.",System.currentTimeMillis());
mNotification.defaults = Notification.DEFAULT_SOUND;
mNotificationManager = (NotificationManager)this.getSystemService(NOTIFICATION_SERVICE);
}
}
解决方案1: 将private WebView webView = new WebView(this);改为
private WebView webView;
然后在onCreate()的这段代码setContentView(R.layout.main);后面增加
webView = new WebView(this);
以上介绍了“编写的Android应用出现The application has stopped unexpected,Please try again”的问题解答，希望对有需要的网友有所帮助。
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