wangqi060934: 2014

2014年10月29日星期三

判断虚拟按键是否存在

不用考虑emulator的话，直接用hasPermanentMenuKey就可以了.

    
    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
    private boolean hasNavBar(Context context) {
 Resources res = context.getResources();
 int resourceId = res.getIdentifier("config_showNavigationBar", 
             "bool","android");
 if (resourceId != 0) {
     boolean hasNav = res.getBoolean(resourceId);
     String sNavBarOverride = null;
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
     try {
  Class c = Class.forName("android.os.SystemProperties");
  Method m = c.getDeclaredMethod("get", String.class);
  m.setAccessible(true);
  sNavBarOverride = (String) m.invoke(null,"qemu.hw.mainkeys");
  } catch (Throwable e) {
     sNavBarOverride = null;
     }
  }

  // check override flag (see static block)
  if ("1".equals(sNavBarOverride)) {
      hasNav = false;
  } else if ("0".equals(sNavBarOverride)) {
      hasNav = true;
  }
      return hasNav;
  } else { // fallback
             return !ViewConfiguration.get(context).hasPermanentMenuKey();
  }
 }

2014年7月17日星期四

DexClassLoader加载未安装的apk

参考: http://wangleyiang.iteye.com/blog/1791947

用DexClassLoader加载jar没什么难度，不过用无参数的构造行数反射调用apk中的Activity就有问题，被调用的Activity中

super.onCreate(savedInstanceState);

会报错，这个Activity没有被正常的初始化，Activity的父父类ContextWrapper的构造函数需要Context。只能修改要被调用的Activity了，注释掉上面出错的那行，然后提供一个有参构造函数，传一个Context过去，以后被调用的Activity里面只能使用这个Context了.

       String dexPath = Environment.getExternalStorageDirectory()
  + "/Test/AAA.apk";
 PackageInfo packageInfo = getPackageManager().getPackageArchiveInfo(
  dexPath, PackageManager.GET_ACTIVITIES);
 String activityName = packageInfo.activities[0].name;
 File dirFile = getDir("whocares", 0);
 DexClassLoader loader = new DexClassLoader(dexPath,
  dirFile.getAbsolutePath(), null,
  ClassLoader.getSystemClassLoader());
 try {
      Class clz = loader.loadClass(activityName);
      Constructor constructor = clz
   .getConstructor(new Class[] { Context.class });
      Activity activity = (Activity) constructor
   .newInstance(new Object[] { this });
      Method create = clz.getDeclaredMethod("onCreate",
   new Class[] { Bundle.class });
      create.setAccessible(true);
      create.invoke(activity, new Object[] { null });
 } catch (ClassNotFoundException e) {
  e.printStackTrace();
 } catch (NoSuchMethodException e) {
  e.printStackTrace();
 } catch (InstantiationException e) {
  e.printStackTrace();
 } catch (IllegalAccessException e) {
  e.printStackTrace();
 } catch (IllegalArgumentException e) {
  e.printStackTrace();
 } catch (InvocationTargetException e) {
  e.printStackTrace();
 }

2014年7月16日星期三

get the URI of an image resource in android

Reference:http://androidbook.blogspot.jp/2009/08/referring-to-android-resources-using.html

Two methods:

```
android.resource://[package]/[res id]
```

android.resource://[package]/[res type]/[res name]

Example:

Uri.parse("android.resource://com.example.test/“ + R.drawable.ic_launcher)

Uri.parse("android.resource://com.example.test/drawable/ic_launcher")

2014年7月15日星期二

修改长按home后出现的app

长按home默认出现的是Google Search，可以改成选择任意的Activity:

   <intent-filter>
      <action android:name="android.intent.action.ASSIST" />
      <category android:name="android.intent.category.DEFAULT" />
   </intent-filter>

     <meta-data
        android:name="com.android.systemui.action_assist_icon"
        android:resource="@android:drawable/sym_def_app_icon" />

2014年6月27日星期五

Android sdk manger cannot download anything in China

因为goagent不能用了，所以只能用改hosts了。
1.先选中Force https://... sources to be fetched using http://...
2. hosts里面添加：

203.208.46.146 dl.google.com
203.208.46.146 dl-ssl.google.com

2014年6月15日星期日

proguard与gson,searchview (v7)

与proguard同时使用要注意：

使用gson时(参见https://code.google.com/p/google-gson/source/browse/trunk/examples/android-proguard-example/proguard.cfg)：

##---------------Begin: proguard configuration for Gson  ----------
# Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
-keepattributes Signature

# For using GSON @Expose annotation
-keepattributes *Annotation*

# Gson specific classes
-keep class sun.misc.Unsafe { *; }
#-keep class com.google.gson.stream.** { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }

##---------------End: proguard configuration for Gson  ----------

使用android support v7中的searchview时：

-keep class android.support.v7.widget.SearchView { *; }

wangqi060934