你好再次感謝的答案,但是這不是我想要什麼切換+進入位置設置
這是錯誤,當我點擊按鈕看起來
09-15 06:25:41.936:D /錯誤點擊(442):這裏是onclick方法中的錯誤 09-15 06:25:41.936:點擊時發生D /錯誤(442):這裏是if語句中的錯誤 09-15 06:25:41.947:D/AndroidRuntime(442):關閉VM 09-15 06:25:41.947:W/dalvikvm(442):threadid = 1:線程退出時未捕獲的異常(group = 0x4001d800 ) 09-15 06:25:41。 957:E/AndroidRuntime(442):致命例外:主 09-15 06:25:41.957:E/AndroidRuntime(442):java.lang.NullPointerException 09-15 06:25:41.957:E/AndroidRuntime(442) ):com.androidhive.googlemaps.ShowMap.onClick(ShowMap.java:42) 09-15 06:25:41.957:E/AndroidRuntime(442):at android.view.View.performClick(View.java:2408) ) 09-15 06:25:41.957:E/AndroidRuntime(442):at android.view.View $ PerformClick.run(View.java:8816) 09-15 06:25:41.957:E/AndroidRuntime(442) ):at android.os.Handler.handleCallback(Handler.java:587) 09-15 06:25:41.957:E/AndroidRuntime(442):at android.os.Handler.dispatchMessage(Handler.java:92) 09-15 06:25:41.957:E/AndroidRuntime(442):at android.os.Looper.loop(Looper.java:123) 09-15 06:25:41.957:E/AndroidRuntime(442)在android.app.ActivityThread.main(ActivityThread.java:4627) 09-15 06:25:41.957:E/AndroidRuntime(442):at java.lang.reflect.Method.invokeNative(Native Method) 09-15 06:25:41.957:E/AndroidRuntime(442):在java.lang.reflect.Method.invoke(Method.java:521) 09-15 06:25:41.957:E/AndroidRuntime(442):at com。 android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868) 09-15 06:25:41.957:E/AndroidRuntime(442):at com.android.internal.os.ZygoteInit.main(ZygoteInit。 java:626) 09-15 06:25:41.957:E/AndroidRuntime(442):at dalvik.system.NativeStart.main(Native Method) 09-15 06:25:45.266:I/Process(442)發送信號。 PID:442 SIG:9
,這是該按鈕的代碼單擊
public void onClick(View v) {
gps = new NetworkSettings();
Log.d("error on click ", "here is the error in the onclick method ");
if(isGPSEnabled)
{
// Log.d("error on click ", "here is the error in the if statement ");
Intent intent = new Intent(this, AndroidGoogleMapsActivity.class);
mContext.startActivity(intent);
}
Log.d("error on click ", "here is the error out the if statement ");
gps.showSettingsAlert();
}
這就是showSettingsAlert()方法
公共無效showSettingsAlert(){ alertDialog =新AlertDialog。助洗劑(mContext);
Log.d("error on click ", "here is the error inthe top of the method ");
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog
.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
我知道錯誤是在點擊按鈕,但我不知道它是什麼,如何解決它,請幫我
謝謝你的答案,但那不是我想要的,所以我編輯我的問題,通過添加一些錯誤代碼似乎更容易理解 – jiji