[英]Android app crashes when clicked on the actionbar/titlebar
我正在開發一個Android應用程序(用於軟糖),其中有9個與意圖相關的活動。 當我單擊頂部的欄時,該應用程序崩潰(應該將我帶到我猜之前的活動)。 我不確定該欄的名稱,但是它顯示了當前活動的名稱。 當我單擊硬件“后退”按鈕時,它不會崩潰,但是當我單擊該欄時,它顯示“應用程序已停止”。 我正在添加模擬器的屏幕截圖,以顯示我正在談論的欄:
這是我的主要活動代碼和個人資料活動代碼:
主要活動:
package com.ecotravel.eco_travel;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.content.Intent;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
EditText usernamefield= (EditText) findViewById(R.id.usernamefield);
EditText passwordfield = (EditText) findViewById(R.id.passwordfield);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/** Called when the user clicks the Log In button */
public void loginFunc(View view) {
Intent intent = new Intent(this, ProfileActivity.class);
startActivity(intent);
EditText usernamefield= (EditText) findViewById(R.id.usernamefield);
EditText passwordfield = (EditText) findViewById(R.id.passwordfield);
}
/** Called when the user clicks the Register button */
public void registerFunc(View view) {
Intent intent = new Intent(this, RegisterActivity.class);
startActivity(intent);
}
}
配置文件活動(屏幕截圖中的一個):
package com.ecotravel.eco_travel;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.support.v4.app.NavUtils;
import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
public class ProfileActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
// Show the Up button in the action bar.
setupActionBar();
}
/**
* Set up the {@link android.app.ActionBar}, if the API is available.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setupActionBar() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.profile, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
/** Called when the user clicks the Search button */
public void searchFunc(View view) {
Intent intent = new Intent(this, SearchActivity.class);
startActivity(intent);
}
/** Called when the user clicks the Wishlist button */
public void wishFunc(View view) {
Intent intent = new Intent(this, WishlistActivity.class);
startActivity(intent);
}
}
有人可以解釋為什么會這樣嗎? 如果沒有,如何從活動中刪除該欄?
編輯:logcat在下面:
06-08 17:50:12.140: E/AndroidRuntime(3235): FATAL EXCEPTION: main
06-08 17:50:12.140: E/AndroidRuntime(3235): java.lang.NoClassDefFoundError: android.support.v4.app.NavUtils
06-08 17:50:12.140: E/AndroidRuntime(3235): at com.ecotravel.eco_travel.ProfileActivity.onOptionsItemSelected(ProfileActivity.java:51)
06-08 17:50:12.140: E/AndroidRuntime(3235): at android.app.Activity.onMenuItemSelected(Activity.java:2548)
06-08 17:50:12.140: E/AndroidRuntime(3235): at com.android.internal.widget.ActionBarView$3.onClick(ActionBarView.java:167)
06-08 17:50:12.140: E/AndroidRuntime(3235): at android.view.View.performClick(View.java:4204)
06-08 17:50:12.140: E/AndroidRuntime(3235): at android.view.View$PerformClick.run(View.java:17355)
06-08 17:50:12.140: E/AndroidRuntime(3235): at android.os.Handler.handleCallback(Handler.java:725)
06-08 17:50:12.140: E/AndroidRuntime(3235): at android.os.Handler.dispatchMessage(Handler.java:92)
06-08 17:50:12.140: E/AndroidRuntime(3235): at android.os.Looper.loop(Looper.java:137)
06-08 17:50:12.140: E/AndroidRuntime(3235): at android.app.ActivityThread.main(ActivityThread.java:5041)
06-08 17:50:12.140: E/AndroidRuntime(3235): at java.lang.reflect.Method.invokeNative(Native Method)
06-08 17:50:12.140: E/AndroidRuntime(3235): at java.lang.reflect.Method.invoke(Method.java:511)
06-08 17:50:12.140: E/AndroidRuntime(3235): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-08 17:50:12.140: E/AndroidRuntime(3235): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-08 17:50:12.140: E/AndroidRuntime(3235): at dalvik.system.NativeStart.main(Native Method)
我找到了解決方案。 問題是升級到adt22。 在adt22中,更改了android-support-v4.jar的位置,這導致了此錯誤。 解決方案在這里: 升級到ADT 22后,不再將庫添加到APK
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