Question

RES /菜单/ mainmenu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

<item
    android:id="@+id/action_settings"
    android:logo="@drawable/ic_action_settings"
    android:showAsAction="ifRoom|withText"
    android:title="@string/action_settings"/>

<item
    android:id="@+id/action_logout"
    android:logo="@drawable/logout"
    android:showAsAction="ifRoom|withText"
    android:title="@string/action_logout"/>


</menu>

MainMenu.java 公共类MainMenu扩展了ActionBarActivity {

    Button userinfo, requestservice, makepayment, trackparcel, checkcard;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_menu);
        // Show the Up button in the action bar.
        // setupActionBar();
        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(false);

        userinfo = (Button) findViewById(R.id.userinfo);
        requestservice = (Button) findViewById(R.id.requestservice);
        makepayment = (Button) findViewById(R.id.makepayment);
        trackparcel = (Button) findViewById(R.id.usertrackbutton);
        checkcard = (Button) findViewById(R.id.checkcard);

        userinfo.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MainMenu.this, UserInfo.class);
                startActivity(intent);
            }
        });
        requestservice.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MainMenu.this, RequestService.class);
                startActivity(intent);

            }
        });
        makepayment.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MainMenu.this, Payment.class);
                startActivity(intent);

            }
        });
        trackparcel.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MainMenu.this, TrackParcel.class);
                startActivity(intent);
            }
        });
        checkcard.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(MainMenu.this, CheckCard.class);
                startActivity(intent);
            }
        });

    }

    public void onBackPressed() {
        new AlertDialog.Builder(MainMenu.this)
                .setTitle("Logout")
                .setMessage("Would you like to logout?")
                .setPositiveButton("Yes",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,
                                    int which) {
                                Intent intent = new Intent(MainMenu.this,
                                        Login.class);
                                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                SharedPreferences sp = PreferenceManager
                                        .getDefaultSharedPreferences(MainMenu.this);
                                Editor edit = sp.edit();
                                edit.clear();
                                edit.commit();
                                startActivity(intent);
                                finish();

                            }
                        })
                .setNegativeButton("No", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        // user doesn't want to logout
                    }
                }).show();
    }

    @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, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case 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;

        case R.id.action_logout: {
            new AlertDialog.Builder(MainMenu.this)
                    .setTitle("Logout")
                    .setMessage("Would you like to logout?")
                    .setPositiveButton("Yes",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog,
                                        int which) {
                                    Intent intent = new Intent(MainMenu.this,
                                            Login.class);
                                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                    SharedPreferences sp = PreferenceManager
                                            .getDefaultSharedPreferences(MainMenu.this);
                                    Editor edit = sp.edit();
                                    edit.clear();
                                    edit.commit();
                                    startActivity(intent);
                                    finish();

                                }
                            })
                    .setNegativeButton("No",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog,
                                        int which) {
                                    // user doesn't want to logout
                                }
                            }).show();
        }
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

}

我想问的是，为什么我的行动项目不会出现在我的ActionBar活动中，尽管我已经写过android:showAsAction="ifRoom|withText" 或 android:showAsAction="always"我没有＆＃39;我知道它为什么会这样。

Answer 1

您正在扩展ActionbarActivity建议您使用支持库中的Actionbar。

更改为

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
 xmlns:app="http://schemas.android.com/apk/res-auto">
<item
    android:id="@+id/action_settings"
    android:logo="@drawable/ic_action_settings"
    app:showAsAction="ifRoom|withText"
    android:title="@string/action_settings"/>

<item
    android:id="@+id/action_logout"
    android:logo="@drawable/logout"
    app:showAsAction="ifRoom|withText"
    android:title="@string/action_logout"/>


</menu>

引用文档

请注意，上面的showAsAction属性使用自定义命名空间在标签中定义。使用任何XML时都需要这样做由支持库定义的属性，因为这些属性可以旧设备上的Android框架中不存在。所以你必须使用您自己的命名空间作为由...定义的所有属性的前缀支持图书馆。

Answer 2

我在这里做了一个愚蠢的错误.. 这是我更改的正确代码

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:yourapp="http://schemas.android.com/apk/res-auto" >

    <item
        android:id="@+id/action_settings"
        android:icon="@drawable/ic_action_settings"
        yourapp:showAsAction="always"
        android:title="@string/action_settings"/>

    <item
        android:id="@+id/action_logout"
        android:icon="@drawable/logout"
        yourapp:showAsAction="always"
        android:title="@string/action_logout"/>

</menu>

将android:logo="@drawable/ic_action_settings"更改为android:icon="@drawable/ic_action_settings"

为什么我的ActionButton不会出现在我的ActionBar中

2 个答案: