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我的標題很自我解釋。這裏是我的代碼：應用程序第一次運行良好，但第二次崩潰
public class MainActivity extends Activity {
private WebView browse;
private TextView t;
private String address="http://www.google.com";
private int refresh, clearcache, time, refreshTime, cacheTime;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SharedPreferences gPrefs = PreferenceManager
.getDefaultSharedPreferences(getBaseContext());
address = gPrefs.getString("Address", "http://www.google.com");
refresh = gPrefs.getInt("Refresh", 1);
clearcache = gPrefs.getInt("ClearCache", 1);
time = gPrefs.getInt("Time", 0);
switch (time) {
case 0:
refreshTime = refresh * 60 * 60 * 1000;
break;
case 1:
refreshTime = refresh * 60 * 1000;
break;
case 2:
refreshTime = refresh * 1000;
break;
}
switch (time) {
case 0:
cacheTime = clearcache * 60 * 60 * 1000;
break;
case 1:
cacheTime = clearcache * 60 * 1000;
break;
case 2:
cacheTime = clearcache * 1000;
break;
}
browse = (WebView) findViewById(R.id.webView1);
t = (TextView) findViewById(R.id.t);
browse.getSettings().setJavaScriptEnabled(true);
browse.getSettings().setPluginsEnabled(true);
browse.getSettings().setLoadWithOverviewMode(true);
browse.getSettings().setUseWideViewPort(true);
browse.getSettings().setBuiltInZoomControls(true);
browse.getSettings().setSupportZoom(true);
browse.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
browse.setScrollbarFadingEnabled(true);
browse.getSettings().setLoadsImagesAutomatically(true);
browse.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
browse.getSettings().setAppCacheMaxSize(1024 * 1024 * 8);
browse.setWebViewClient(new WebViewClient() {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
t.setVisibility(TextView.VISIBLE);
}
@Override
public void onPageFinished(WebView view, String url) {
// do your stuff here
super.onPageFinished(view, url);
t.setVisibility(TextView.GONE);
}
});
try {
browse.loadUrl(address);
} catch (Exception e) {
e.printStackTrace();
}
refreshRRryan();
cacheRRryan();
}
final Handler refreshhandler = new Handler();
final Timer refreshtimer = new Timer();
final Runnable refreshdoA = new Runnable() {
@Override
public void run() {
browse.reload();
}
};
public void refreshRRryan() {
TimerTask refreshtask = new TimerTask() {
@Override
public void run() {
refreshhandler.post(refreshdoA);
}
};
refreshtimer.scheduleAtFixedRate(refreshtask, refreshTime, refreshTime);
}
final Handler cachehandler = new Handler();
final Timer cachetimer = new Timer();
final Runnable cachedoA = new Runnable() {
@Override
public void run() {
browse.clearCache(true);
getApplicationContext().deleteDatabase("webview.db");
getApplicationContext().deleteDatabase("webviewCache.db");
}
};
public void cacheRRryan() {
TimerTask cachetask = new TimerTask() {
@Override
public void run() {
cachehandler.post(cachedoA);
}
};
cachetimer.scheduleAtFixedRate(cachetask, cacheTime, cacheTime);
}
@Override
public File getCacheDir() {
// NOTE: this method is used in Android 2.1
return getApplicationContext().getCacheDir();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
super.onCreateOptionsMenu(menu);
MenuInflater blowUp = getMenuInflater();
blowUp.inflate(R.menu.activity_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.aboutUs:
Intent i = new Intent("ABOUT");
startActivity(i);
break;
case R.id.preferences:
Intent p = new Intent("PREFS");
startActivityForResult(p, 101);
break;
}
return false;
}
}
而這裏的logcat的：
08-17 11:08:05.997: E/AndroidRuntime(1197): FATAL EXCEPTION: main
08-17 11:08:05.997: E/AndroidRuntime(1197): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fit.world.browser/com.fit.world.browser.MainActivity}: java.lang.ClassCastException: java.lang.String
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.os.Handler.dispatchMessage(Handler.java:99)
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.os.Looper.loop(Looper.java:123)
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-17 11:08:05.997: E/AndroidRuntime(1197): at java.lang.reflect.Method.invokeNative(Native Method)
08-17 11:08:05.997: E/AndroidRuntime(1197): at java.lang.reflect.Method.invoke(Method.java:507)
08-17 11:08:05.997: E/AndroidRuntime(1197): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-17 11:08:05.997: E/AndroidRuntime(1197): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-17 11:08:05.997: E/AndroidRuntime(1197): at dalvik.system.NativeStart.main(Native Method)
08-17 11:08:05.997: E/AndroidRuntime(1197): Caused by: java.lang.ClassCastException: java.lang.String
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.app.ContextImpl$SharedPreferencesImpl.getInt(ContextImpl.java:2817)
08-17 11:08:05.997: E/AndroidRuntime(1197): at com.fit.world.browser.MainActivity.onCreate(MainActivity.java:37)
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-17 11:08:05.997: E/AndroidRuntime(1197): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
08-17 11:08:05.997: E/AndroidRuntime(1197): ... 11 more
而且我敢肯定我的表現很好，因爲該活動第一次運行時。
請幫助我。
哪些代碼是在37沒有行？ – 2012-08-17 06:34:16
請在'SharedSetference'編輯的'put'和'commit'處顯示代碼。 – Eric 2012-08-17 06:35:33
我會在崩潰前放一個Log.d（「debug」，variable）;看看它打印出來了。錯誤發生在你的主要活動的第37行，我猜測它是switch（time）{'因此在交換機之前放置Log.d（「debug」，time）;'看看每次打印出來的內容它崩潰。 – Rawr 2012-08-17 06:44:47