标签: android

为android创建密钥库的步骤(在eclipse环境中)？我需要在我的应用程序中使用谷歌地图,我不知道我错过了哪些步骤.请向我提供具体的详细步骤(我从指南中了解不到).

如何通过任何程序而不是代码来截取手机屏幕的选定区域？

片段似乎非常适合将UI逻辑分离为某些模块.但随着ViewPager它的生命周期对我来说仍然是迷雾.因此迫切需要大师的想法!

编辑

见下面的哑解决方案;-)

范围

主要活动有ViewPager碎片.这些片段可以为其他(子域)活动实现一些不同的逻辑,因此片段的数据通过活动内部的回调接口填充.第一次发布时一切正常,但是!...

问题

当重新创建活动时(例如,在方向改变时),那么ViewPager碎片也是如此.代码(你会在下面找到)说每次创建活动时我尝试创建一个ViewPager与片段相同的新片段适配器(也许这就是问题)但FragmentManager已经将所有这些片段存储在某个地方(其中？)和为那些人启动娱乐机制.因此,重新启动机制使用我的回调接口调用来调用"旧"片段的onAttach,onCreateView等,以通过Activity的实现方法启动数据.但是这个方法指向通过Activity的onCreate方法创建的新创建的片段.

问题

也许我使用了错误的模式,但即便是Android 3 Pro也没有太多关于它的内容.所以,请给我一两拳,并指出如何以正确的方式做到这一点.非常感谢!

码

主要活动

public class DashboardActivity extends BasePagerActivity implements OnMessageListActionListener {

private MessagesFragment mMessagesFragment;

@Override
protected void onCreate(Bundle savedInstanceState) {
    Logger.d("Dash onCreate");
    super.onCreate(savedInstanceState);

    setContentView(R.layout.viewpager_container);
    new DefaultToolbar(this);

    // create fragments to use
    mMessagesFragment = new MessagesFragment();
    mStreamsFragment = new StreamsFragment();

    // set titles and fragments for view pager
    Map<String, Fragment> screens = new LinkedHashMap<String, Fragment>();
    screens.put(getApplicationContext().getString(R.string.dashboard_title_dumb), new DumbFragment());
    screens.put(getApplicationContext().getString(R.string.dashboard_title_messages), mMessagesFragment);

    // …

我可以使用Android模拟器访问我的笔记本电脑网络服务器,我使用10.0.2.2:portno 效果很好.

但是当我连接我真正的Android手机时,手机浏览器无法连接到笔记本电脑上的同一个Web服务器.手机通过USB线连接到笔记本电脑.如果我运行adb devices命令,我可以看到我的手机.

我错过了什么？

试图移动我的东西Toolbar而不是动作栏,但我不断收到错误说

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tyczj.weddingalbum/com.xxx.xxx.MainActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5039)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. …

<ImageButton android:id="@+id/previous"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/media_skip_backward"
android:background="@drawable/transparent"></ImageButton>

这就是我试图获得透明的ImageButton以便将这些按钮放在SurfaceView上.但是,只要我在xml中包含透明线,Eclipse就会在项目中出现错误.

请帮忙.

我从我的应用程序中获取用户报告,提供以下异常:

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1109)
at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:399)
at android.app.Activity.onBackPressed(Activity.java:2066)
at android.app.Activity.onKeyUp(Activity.java:2044)
at android.view.KeyEvent.dispatch(KeyEvent.java:2529)
at android.app.Activity.dispatchKeyEvent(Activity.java:2274)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1855)
at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1277)
at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.widget.TabHost.dispatchKeyEvent(TabHost.java:297)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1855)
at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1277)
at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803)
at android.view.ViewRoot.deliverKeyEventPostIme(ViewRoot.java:2880)
at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2853)
at android.view.ViewRoot.handleMessage(ViewRoot.java:2028)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:132)
at android.app.ActivityThread.main(ActivityThread.java:4028)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844) …

在Android SDK文档中,与@ drawable/my_image xml语法一起使用的所有示例都直接处理存储在项目的res/drawable目录中的图像.

我想知道在drawable目录中创建子目录是否明确不可行.

例如,如果我有以下目录布局:

res/drawable
-- sandwiches
  -- tunaOnRye.png
  -- hamAndSwiss.png
-- drinks
  -- coldOne.png
  -- hotTea.png

我可以参考金枪鱼沙拉三明治的图像@ drawable/sandwiches/tunaOnRye

或者我必须将层次结构保持在drawable目录中.

我怎么能转换List成ArrayJava中？

检查以下代码:

ArrayList<Tienda> tiendas;
List<Tienda> tiendasList; 
tiendas = new ArrayList<Tienda>();

Resources res = this.getBaseContext().getResources();
XMLParser saxparser =  new XMLParser(marca,res);

tiendasList = saxparser.parse(marca,res);
tiendas = tiendasList.toArray();

this.adaptador = new adaptadorMarca(this, R.layout.filamarca, tiendas);
setListAdapter(this.adaptador);  

我需要tiendas使用值填充数组tiendasList.

我写了一个Android应用程序.现在,我想让设备在某个动作发生时振动.我怎样才能做到这一点？