android.content.Context#getApplicationInfo ( )源码实例Demo

/**
 * MUST be called on non-Main Thread
 * @param names array of file names in 'assets' directory
 */
public static void copyJarsFromAssets(final Context cxt, final String[] names) {
    if(debug) {
        Log.d(TAG, "copyJarsFromAssets(" + Arrays.deepToString(names) + ")");
    }
    final File dexDir = cxt.getDir(DIR_SUBDEX, Context.MODE_PRIVATE); // this API creates the directory if not exist
    File apkFile = new File(cxt.getApplicationInfo().sourceDir);
    // should copy subdex JARs to dexDir?
    final boolean shouldInit = shouldDexOpt(apkFile, dexDir, names);
    if (shouldInit) {
        try {
            copyToInternal(cxt, dexDir, names);
            appendOdexesToClassPath(cxt, dexDir, names);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    } else {
        if (!inAppended(names)) {
            appendOdexesToClassPath(cxt, dexDir, names);
        }
    }
}
 

public static String getVersionName(Context context) {
    if (!TextUtils.isEmpty(sAppVersion)) {
        return sAppVersion;
    } else {
        String appVersion = "";
        try {
            String pkgName = context.getApplicationInfo().packageName;
            appVersion = context.getPackageManager().getPackageInfo(pkgName, 0).versionName;
            if (appVersion != null && appVersion.length() > 0) {
                Matcher matcher = VERSION_NAME_PATTERN.matcher(appVersion);
                if (matcher.matches()) {
                    appVersion = matcher.group(1);
                    sAppVersion = appVersion;
                }
            }
        } catch (Throwable t) {
            LogHelper.e(TAG, t.toString());
        }

        return appVersion;
    }
}
 

public boolean validateSignature(Context context, String packageName) {
    String brand = Build.BRAND;
    int applicationFlags = context.getApplicationInfo().flags;
    if (brand.startsWith("generic") && (applicationFlags & ApplicationInfo.FLAG_DEBUGGABLE) != 0) {
        // We are debugging on an emulator, don't validate package signature.
        return true;
    }

    PackageInfo packageInfo = null;
    try {
        packageInfo = context.getPackageManager().getPackageInfo(packageName,
                PackageManager.GET_SIGNATURES);
    } catch (PackageManager.NameNotFoundException e) {
        return false;
    }

    for (Signature signature : packageInfo.signatures) {
        String hashedSignature = Utility.sha1hash(signature.toByteArray());
        if (validAppSignatureHashes.contains(hashedSignature)) {
            return true;
        }
    }

    return false;
}
 

/**
 * @return the path to native libraries.
 */
@SuppressWarnings("unused")
@CalledByNative
private static String getNativeLibraryDirectory(Context appContext) {
    ApplicationInfo ai = appContext.getApplicationInfo();
    if ((ai.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0 ||
        (ai.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
        return ai.nativeLibraryDir;
    }

    return "/system/lib/";
}
 

/**
 * Gets the application name to display on the UI.
 */
final String getApplicationName() {
    final Context context = getActivity();
    final Resources res = getResources();
    final int applicationLabelRes = context.getApplicationInfo().labelRes;
    return res.getString(applicationLabelRes);
}
 

public static void toggleAppIcon(final Context context) {
    final int appInfoFlags = context.getApplicationInfo().flags;
    final boolean isSystemApp = (appInfoFlags & ApplicationInfo.FLAG_SYSTEM) > 0;
    if (Log.isLoggable(TAG, Log.INFO)) {
        Log.i(TAG, "toggleAppIcon() : FLAG_SYSTEM = " + isSystemApp);
    }
    final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
    context.getPackageManager().setComponentEnabledSetting(
            new ComponentName(context, SetupActivity.class),
            Settings.readShowSetupWizardIcon(prefs, context)
                    ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
                    : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
            PackageManager.DONT_KILL_APP);
}
 

/**
 * 判断当前应用是否是debug状态
 */

public static boolean isApkInDebug(Context context) {
    try {
        ApplicationInfo info = context.getApplicationInfo();
        return (info.flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0;
    } catch (Exception e) {
        return false;
    }
}
 

public static boolean isDebug(Context c) {
    try {
        return (c.getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0;
    } catch (Exception ignored) {

    }
    return false;
}
 

static int calculateMemoryCacheSize(Context context) {
  ActivityManager am = ContextCompat.getSystemService(context, ActivityManager.class);
  boolean largeHeap = (context.getApplicationInfo().flags & FLAG_LARGE_HEAP) != 0;
  int memoryClass = largeHeap ? am.getLargeMemoryClass() : am.getMemoryClass();
  // Target ~15% of the available heap.
  return (int) (1024L * 1024L * memoryClass / 7);
}
 

/**
 * @hide
 */
public DownloadManager(Context context) {
    mResolver = context.getContentResolver();
    mPackageName = context.getPackageName();

    // Callers can access filename columns when targeting old platform
    // versions; otherwise we throw telling them it's deprecated.
    mAccessFilename = context.getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.N;
}
 

public static String getDataDir(Context ctx) {
    ApplicationInfo ai = ctx.getApplicationInfo();
    if (ai.dataDir != null)
        return fixLastSlash(ai.dataDir);
    else
        return "/data/data/" + ai.packageName + "/";
}
 

private void init(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || context.getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.M) {
        mForegroundDelegate = new ForegroundDelegate(this);
        mForegroundDelegate.init(context, attrs, defStyleAttr, defStyleRes);
    }
}
 

public SpaceCalculateTask(Context context, StorageSettingsAdapter adapter) {
    mServerManager = ServerConfigManager.getInstance(context);
    mDataDir = new File(context.getApplicationInfo().dataDir);
    mAdapter = new WeakReference<>(adapter);
}
 

public static String getApplicationName(Context context) {
    ApplicationInfo applicationInfo = context.getApplicationInfo();
    int stringId = applicationInfo.labelRes;
    return stringId == 0 ? applicationInfo.nonLocalizedLabel.toString() : context.getString(stringId);
}
 

/**
 * Creates a new ViewTreeObserver. This constructor should not be called
 */
ViewTreeObserver(Context context) {
    sIllegalOnDrawModificationIsFatal =
            context.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.O;
}
 

@Override
public Activity newActivity(ClassLoader cl, String className, Intent intent) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
    try {
        cl.loadClass(className);
        Log.i(TAG, String.format("newActivity[%s]", className));
        
    } catch (ClassNotFoundException e) {
        ComponentName component = PluginUtil.getComponent(intent);
        
        if (component == null) {
            return newActivity(mBase.newActivity(cl, className, intent));
        }

        String targetClassName = component.getClassName();
        Log.i(TAG, String.format("newActivity[%s : %s/%s]", className, component.getPackageName(), targetClassName));

        LoadedPlugin plugin = this.mPluginManager.getLoadedPlugin(component);

        if (plugin == null) {
            // Not found then goto stub activity.
            boolean debuggable = false;
            try {
                Context context = this.mPluginManager.getHostContext();
                debuggable = (context.getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0;
            } catch (Throwable ex) {
    
            }

            if (debuggable) {
                throw new ActivityNotFoundException("error intent: " + intent.toURI());
            }
            
            Log.i(TAG, "Not found. starting the stub activity: " + StubActivity.class);
            return newActivity(mBase.newActivity(cl, StubActivity.class.getName(), intent));
        }
        
        Activity activity = mBase.newActivity(plugin.getClassLoader(), targetClassName, intent);
        activity.setIntent(intent);

        // for 4.1+
        Reflector.QuietReflector.with(activity).field("mResources").set(plugin.getResources());

        return newActivity(activity);
    }

    return newActivity(mBase.newActivity(cl, className, intent));
}
 

/**
 * Construct a new Switch with a default style determined by the given theme
 * attribute or style resource, overriding specific style attributes as
 * requested.
 *
 * @param context The Context that will determine this widget's theming.
 * @param attrs Specification of attributes that should deviate from the
 *        default styling.
 * @param defStyleAttr An attribute in the current theme that contains a
 *        reference to a style resource that supplies default values for
 *        the view. Can be 0 to not look for defaults.
 * @param defStyleRes A resource identifier of a style resource that
 *        supplies default values for the view, used only if
 *        defStyleAttr is 0 or can not be found in the theme. Can be 0
 *        to not look for defaults.
 */
public Switch(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);

    mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);

    final Resources res = getResources();
    mTextPaint.density = res.getDisplayMetrics().density;
    mTextPaint.setCompatibilityScaling(res.getCompatibilityInfo().applicationScale);

    final TypedArray a = context.obtainStyledAttributes(
            attrs, com.android.internal.R.styleable.Switch, defStyleAttr, defStyleRes);
    mThumbDrawable = a.getDrawable(com.android.internal.R.styleable.Switch_thumb);
    if (mThumbDrawable != null) {
        mThumbDrawable.setCallback(this);
    }
    mTrackDrawable = a.getDrawable(com.android.internal.R.styleable.Switch_track);
    if (mTrackDrawable != null) {
        mTrackDrawable.setCallback(this);
    }
    mTextOn = a.getText(com.android.internal.R.styleable.Switch_textOn);
    mTextOff = a.getText(com.android.internal.R.styleable.Switch_textOff);
    mShowText = a.getBoolean(com.android.internal.R.styleable.Switch_showText, true);
    mThumbTextPadding = a.getDimensionPixelSize(
            com.android.internal.R.styleable.Switch_thumbTextPadding, 0);
    mSwitchMinWidth = a.getDimensionPixelSize(
            com.android.internal.R.styleable.Switch_switchMinWidth, 0);
    mSwitchPadding = a.getDimensionPixelSize(
            com.android.internal.R.styleable.Switch_switchPadding, 0);
    mSplitTrack = a.getBoolean(com.android.internal.R.styleable.Switch_splitTrack, false);

    mUseFallbackLineSpacing = context.getApplicationInfo().targetSdkVersion >= VERSION_CODES.P;

    ColorStateList thumbTintList = a.getColorStateList(
            com.android.internal.R.styleable.Switch_thumbTint);
    if (thumbTintList != null) {
        mThumbTintList = thumbTintList;
        mHasThumbTint = true;
    }
    PorterDuff.Mode thumbTintMode = Drawable.parseTintMode(
            a.getInt(com.android.internal.R.styleable.Switch_thumbTintMode, -1), null);
    if (mThumbTintMode != thumbTintMode) {
        mThumbTintMode = thumbTintMode;
        mHasThumbTintMode = true;
    }
    if (mHasThumbTint || mHasThumbTintMode) {
        applyThumbTint();
    }

    ColorStateList trackTintList = a.getColorStateList(
            com.android.internal.R.styleable.Switch_trackTint);
    if (trackTintList != null) {
        mTrackTintList = trackTintList;
        mHasTrackTint = true;
    }
    PorterDuff.Mode trackTintMode = Drawable.parseTintMode(
            a.getInt(com.android.internal.R.styleable.Switch_trackTintMode, -1), null);
    if (mTrackTintMode != trackTintMode) {
        mTrackTintMode = trackTintMode;
        mHasTrackTintMode = true;
    }
    if (mHasTrackTint || mHasTrackTintMode) {
        applyTrackTint();
    }

    final int appearance = a.getResourceId(
            com.android.internal.R.styleable.Switch_switchTextAppearance, 0);
    if (appearance != 0) {
        setSwitchTextAppearance(context, appearance);
    }
    a.recycle();

    final ViewConfiguration config = ViewConfiguration.get(context);
    mTouchSlop = config.getScaledTouchSlop();
    mMinFlingVelocity = config.getScaledMinimumFlingVelocity();

    // Refresh display with current params
    refreshDrawableState();
    setChecked(isChecked());
}
 

public static void toggleLogging(Context ctx) {
	mLoggingEnabled = (0 != (ctx.getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE));
}
 

/**
 * Initialize the GcmHelper class. To be called from the application class onCreate or from the
 * onCreate of the main activity
 *
 * @param context An instance of the Application Context
 */
public synchronized void init(@NonNull Context context) {
  if(!isGooglePlayservicesAvailable(context)){
    throw new IllegalArgumentException("Not using the recommended Play Services version");
  }
  //get the GCM sender id from strings.xml
  if (TextUtils.isEmpty(senderID)) {
    int id =
            context.getResources().getIdentifier("gcm_authorized_entity", "string", context.getPackageName());
    senderID = context.getResources().getString(id);
  }

  if(TextUtils.isEmpty(senderID)){
    throw new IllegalArgumentException("No SenderId provided!! Cannot instantiate");
  }

  SharedPreferences localPref = getSharedPreference(context);
  //get topics array
  if (localPref.contains(PREF_KEY_SUBSCRIPTION)) {
    String subscription = localPref.getString(PREF_KEY_SUBSCRIPTION, null);
    if (!TextUtils.isEmpty(subscription)) {
      try {
        JSONArray array = new JSONArray(subscription);
        int length = array.length();
        topics = new ArrayList<>();
        for (int i = 0; i < length; i++) {
          topics.add(array.getString(i));
        }
      } catch (JSONException ignored) {
        if (DEBUG_ENABLED) Log.e(TAG, "init: while processing subscription list", ignored);
      }
    }
  }

  boolean registrationReq = true;
  if (localPref.contains(PREF_KEY_TOKEN)) {
    pushToken = localPref.getString(PREF_KEY_TOKEN, null);
    if(!TextUtils.isEmpty(pushToken)){
      registrationReq = false;
      //don't pass token if already present
    }
  }
  if(registrationReq){
    //register for push token
    Intent registration = new Intent(context, RegistrationIntentService.class);
    registration.setAction(RegistrationIntentService.ACTION_REGISTER);
    context.startService(registration);
  }
  //check if debug build and enable DEBUG MODE
  DEBUG_ENABLED = (0 != (context.getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE));
  initialized = true;
}
 

/**
 * Returns the integer identifier for the default app icon.
 *
 * @param context The Android context
 * @return The integer identifier for the image resource
 */
static int getAppIconAsIntId(final Context context) {
    ApplicationInfo ai = context.getApplicationInfo();
    return ai.icon;
}