Java Question How can i get (in java-lib) a reference to the Activityobject

DonManfred

Expert
Licensed User
How can i get (in java-lib) a reference to the Activityobject from b4a´s running activity?
Maybe as parameter given to a library-method-call

B4X:
/**
*
*/
package de.donmanfred.b4a.TintManager;

//import android.annotation.SuppressLint;
//import android.annotation.TargetApi;
import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.FrameLayout.LayoutParams;
import anywheresoftware.b4a.BA;
import anywheresoftware.b4a.BA.ActivityObject;
//import anywheresoftware.b4a.BA.DependsOn;
//import anywheresoftware.b4a.BA.Events;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.BA.Version;

import java.lang.reflect.Method;

@Version(0.01f)
@ShortName("TintManager")
//@Permissions(values={"android.permission.INTERNET", "android.permission.ACCESS_NETWORK_STATE"})
//@Events(values={"AccountReady (Success As Boolean)"})
//@DependsOn(values={"google-play-services","android-support-v4"})


/**
* @author DonManfred
*
*/

/**
* Class to manage status and navigation bar tint effects when using KitKat
* translucent system UI modes.
*
*/
@SuppressWarnings({ "rawtypes", "unused"})
public class SystemBarTintManager {

   
   
    public void Initialize(final BA ba){
        SystemBarTintManager tintManager = new SystemBarTintManager();
        tintManager.setStatusBarTintEnabled(true);
        tintManager.setNavigationBarTintEnabled(true);
    }
   
    static {
        // Android allows a system property to override the presence of the navigation bar.
    // Used by the emulator.
        // See https://github.com/android/platform_frameworks_base/blob/master/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java#L1076
        if (Build.VERSION.SDK_INT >= 19) {
            try {
                Class c = Class.forName("android.os.SystemProperties");
                @SuppressWarnings("unchecked")
                Method m = c.getDeclaredMethod("get", String.class);
                m.setAccessible(true);
                sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
            } catch (Throwable e) {
                sNavBarOverride = null;
            }
        }
    }


    /**
     * The default system bar tint color value.
     */
    public static final int DEFAULT_TINT_COLOR = 0x99000000;

    private static String sNavBarOverride;

    private SystemBarConfig mConfig;
    private boolean mStatusBarAvailable;
    private boolean mNavBarAvailable;
    private boolean mStatusBarTintEnabled;
    private boolean mNavBarTintEnabled;
    private View mStatusBarTintView;
    private View mNavBarTintView;

    /**
     * Constructor. Call this in the host activity onCreate method after its
     * content view has been set. You should always create new instances when
     * the host activity is recreated.
     *
     * @param activity The host activity.
     */
    //@TargetApi(19)
    @ActivityObject
    public SystemBarTintManager() {
        final Activity act = BA.activity;
        Window win = act.getWindow();
        ViewGroup decorViewGroup = (ViewGroup) win.getDecorView();
        //        if (Build.VERSION.SDK_INT >= 19) {
        //            // check theme attrs
        //            int[] attrs = {android.R.attr.windowTranslucentStatus,
        //                    android.R.attr.windowTranslucentNavigation};
        //            TypedArray a = activity.obtainStyledAttributes(attrs);
        //            try {
        //                mStatusBarAvailable = a.getBoolean(0, false);
        //                mNavBarAvailable = a.getBoolean(1, false);
        //            } finally {
        //                a.recycle();
        //            }
        //
        //            // check window flags
        //            WindowManager.LayoutParams winParams = win.getAttributes();
        //            int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
        //            if ((winParams.flags & bits) != 0) {
        //                mStatusBarAvailable = true;
        //            }
        //            bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
        //            if ((winParams.flags & bits) != 0) {
        //                mNavBarAvailable = true;
        //            }
        //        }
   
        mConfig = new SystemBarConfig(act, mStatusBarAvailable, mNavBarAvailable);
        // device might not have virtual navigation keys
        if (!mConfig.hasNavigtionBar()) {
            mNavBarAvailable = false;
        }
   
        if (mStatusBarAvailable) {
            setupStatusBarView( act, decorViewGroup);
        }
        if (mNavBarAvailable) {
            setupNavBarView( act, decorViewGroup);
        }
    }


    /**
     * Enable tinting of the system status bar.
     *
     * If the platform is running Jelly Bean or earlier, or translucent system
     * UI modes have not been enabled in either the theme or via window flags,
     * then this method does nothing.
     *
     * @param enabled True to enable tinting, false to disable it (default).
     */
  public void setStatusBarTintEnabled(boolean enabled) {
      mStatusBarTintEnabled = enabled;
      if (mStatusBarAvailable) {
          mStatusBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
      }
  }

  /**
   * Enable tinting of the system navigation bar.
   *
   * If the platform does not have soft navigation keys, is running Jelly Bean
   * or earlier, or translucent system UI modes have not been enabled in either
   * the theme or via window flags, then this method does nothing.
   *
   * @param enabled True to enable tinting, false to disable it (default).
   */
  public void setNavigationBarTintEnabled(boolean enabled) {
      mNavBarTintEnabled = enabled;
      if (mNavBarAvailable) {
          mNavBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
      }
  }

  /**
   * Apply the specified color tint to all system UI bars.
   *
   * @param color The color of the background tint.
   */
  public void setTintColor(int color) {
      setStatusBarTintColor(color);
      setNavigationBarTintColor(color);
  }

  /**
   * Apply the specified drawable or color resource to all system UI bars.
   *
   * @param res The identifier of the resource.
   */
  public void setTintResource(int res) {
      setStatusBarTintResource(res);
      setNavigationBarTintResource(res);
  }

  /**
   * Apply the specified drawable to all system UI bars.
   *
   * @param drawable The drawable to use as the background, or null to remove it.
   */
  public void setTintDrawable(Drawable drawable) {
      setStatusBarTintDrawable(drawable);
      setNavigationBarTintDrawable(drawable);
  }

  /**
   * Apply the specified alpha to all system UI bars.
   *
   * @param alpha The alpha to use
   */
  public void setTintAlpha(float alpha) {
      setStatusBarAlpha(alpha);
      setNavigationBarAlpha(alpha);
  }

  /**
   * Apply the specified color tint to the system status bar.
   *
   * @param color The color of the background tint.
   */
  public void setStatusBarTintColor(int color) {
      if (mStatusBarAvailable) {
          mStatusBarTintView.setBackgroundColor(color);
      }
  }

  /**
   * Apply the specified drawable or color resource to the system status bar.
   *
   * @param res The identifier of the resource.
   */
  public void setStatusBarTintResource(int res) {
      if (mStatusBarAvailable) {
          mStatusBarTintView.setBackgroundResource(res);
      }
  }

  /**
   * Apply the specified drawable to the system status bar.
   *
   * @param drawable The drawable to use as the background, or null to remove it.
   */
  @SuppressWarnings("deprecation")
  public void setStatusBarTintDrawable(Drawable drawable) {
      if (mStatusBarAvailable) {
          mStatusBarTintView.setBackgroundDrawable(drawable);
      }
  }

  /**
   * Apply the specified alpha to the system status bar.
   *
   * @param alpha The alpha to use
   */
  //@TargetApi(11)
  public void setStatusBarAlpha(float alpha) {
      if (mStatusBarAvailable && Build.VERSION.SDK_INT >= 11) {
          mStatusBarTintView.setAlpha(alpha);
      }
  }

  /**
   * Apply the specified color tint to the system navigation bar.
   *
   * @param color The color of the background tint.
   */
  public void setNavigationBarTintColor(int color) {
      if (mNavBarAvailable) {
          mNavBarTintView.setBackgroundColor(color);
      }
  }

  /**
   * Apply the specified drawable or color resource to the system navigation bar.
   *
   * @param res The identifier of the resource.
   */
  public void setNavigationBarTintResource(int res) {
      if (mNavBarAvailable) {
          mNavBarTintView.setBackgroundResource(res);
      }
  }

  /**
   * Apply the specified drawable to the system navigation bar.
   *
   * @param drawable The drawable to use as the background, or null to remove it.
   */
  @SuppressWarnings("deprecation")
  public void setNavigationBarTintDrawable(Drawable drawable) {
      if (mNavBarAvailable) {
          mNavBarTintView.setBackgroundDrawable(drawable);
      }
  }

  /**
   * Apply the specified alpha to the system navigation bar.
   *
   * @param alpha The alpha to use
   */
  //@TargetApi(11)
  public void setNavigationBarAlpha(float alpha) {
      if (mNavBarAvailable && Build.VERSION.SDK_INT >= 11) {
          mNavBarTintView.setAlpha(alpha);
      }
  }

  /**
   * Get the system bar configuration.
   *
   * @return The system bar configuration for the current device configuration.
   */
  public SystemBarConfig getConfig() {
      return mConfig;
  }

  /**
   * Is tinting enabled for the system status bar?
   *
   * @return True if enabled, False otherwise.
   */
  public boolean isStatusBarTintEnabled() {
      return mStatusBarTintEnabled;
  }

  /**
   * Is tinting enabled for the system navigation bar?
   *
   * @return True if enabled, False otherwise.
   */
  public boolean isNavBarTintEnabled() {
      return mNavBarTintEnabled;
  }

  private void setupStatusBarView(Context context, ViewGroup decorViewGroup) {
      mStatusBarTintView = new View(context);
      LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getStatusBarHeight());
      params.gravity = Gravity.TOP;
      if (mNavBarAvailable && !mConfig.isNavigationAtBottom()) {
          params.rightMargin = mConfig.getNavigationBarWidth();
      }
      mStatusBarTintView.setLayoutParams(params);
      mStatusBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
      mStatusBarTintView.setVisibility(View.GONE);
      decorViewGroup.addView(mStatusBarTintView);
  }

  private void setupNavBarView(Context context, ViewGroup decorViewGroup) {
      mNavBarTintView = new View(context);
      LayoutParams params;
      if (mConfig.isNavigationAtBottom()) {
          params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getNavigationBarHeight());
          params.gravity = Gravity.BOTTOM;
      } else {
          params = new LayoutParams(mConfig.getNavigationBarWidth(), LayoutParams.MATCH_PARENT);
          params.gravity = Gravity.RIGHT;
      }
      mNavBarTintView.setLayoutParams(params);
      mNavBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
      mNavBarTintView.setVisibility(View.GONE);
      decorViewGroup.addView(mNavBarTintView);
  }

  /**
   * Class which describes system bar sizing and other characteristics for the current
   * device configuration.
   *
   */
  public static class SystemBarConfig {

      private static final String STATUS_BAR_HEIGHT_RES_NAME = "status_bar_height";
      private static final String NAV_BAR_HEIGHT_RES_NAME = "navigation_bar_height";
      private static final String NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME = "navigation_bar_height_landscape";
      private static final String NAV_BAR_WIDTH_RES_NAME = "navigation_bar_width";
      private static final String SHOW_NAV_BAR_RES_NAME = "config_showNavigationBar";

      private final boolean mTranslucentStatusBar;
      private final boolean mTranslucentNavBar;
      private final int mStatusBarHeight;
      private final int mActionBarHeight;
      private final boolean mHasNavigationBar;
      private final int mNavigationBarHeight;
      private final int mNavigationBarWidth;
      private final boolean mInPortrait;
      private final float mSmallestWidthDp;

      private SystemBarConfig(Activity activity, boolean translucentStatusBar, boolean traslucentNavBar) {
          Resources res = activity.getResources();
          mInPortrait = (res.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT);
          mSmallestWidthDp = getSmallestWidthDp(activity);
          mStatusBarHeight = getInternalDimensionSize(res, STATUS_BAR_HEIGHT_RES_NAME);
          mActionBarHeight = getActionBarHeight(activity);
          mNavigationBarHeight = getNavigationBarHeight(activity);
          mNavigationBarWidth = getNavigationBarWidth(activity);
          mHasNavigationBar = (mNavigationBarHeight > 0);
          mTranslucentStatusBar = translucentStatusBar;
          mTranslucentNavBar = traslucentNavBar;
      }

      //@TargetApi(14)
      private int getActionBarHeight(Context context) {
          int result = 0;
          if (Build.VERSION.SDK_INT >= 14) {
              TypedValue tv = new TypedValue();
              context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);
              result = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources().getDisplayMetrics());
          }
          return result;
      }

      //@TargetApi(14)
      private int getNavigationBarHeight(Context context) {
          Resources res = context.getResources();
          int result = 0;
          if (Build.VERSION.SDK_INT >= 14) {
              if (hasNavBar(context)) {
                  String key;
                  if (mInPortrait) {
                      key = NAV_BAR_HEIGHT_RES_NAME;
                  } else {
                      key = NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME;
                  }
                  return getInternalDimensionSize(res, key);
              }
          }
          return result;
      }

      //@TargetApi(14)
      private int getNavigationBarWidth(Context context) {
          Resources res = context.getResources();
          int result = 0;
          if (Build.VERSION.SDK_INT >= 14) {
              if (hasNavBar(context)) {
                  return getInternalDimensionSize(res, NAV_BAR_WIDTH_RES_NAME);
              }
          }
          return result;
      }

      //@TargetApi(14)
      private boolean hasNavBar(Context context) {
          Resources res = context.getResources();
          int resourceId = res.getIdentifier(SHOW_NAV_BAR_RES_NAME, "bool", "android");
          if (resourceId != 0) {
              boolean hasNav = res.getBoolean(resourceId);
              // 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();
          }
      }

      private int getInternalDimensionSize(Resources res, String key) {
          int result = 0;
          int resourceId = res.getIdentifier(key, "dimen", "android");
          if (resourceId > 0) {
              result = res.getDimensionPixelSize(resourceId);
          }
          return result;
      }

      //@SuppressLint("NewApi")
      private float getSmallestWidthDp(Activity activity) {
          DisplayMetrics metrics = new DisplayMetrics();
          //if (Build.VERSION.SDK_INT >= 16) {
              //activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
          //} else {
              // TODO this is not correct, but we don't really care pre-kitkat
              activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
          //}
          float widthDp = metrics.widthPixels / metrics.density;
          float heightDp = metrics.heightPixels / metrics.density;
          return Math.min(widthDp, heightDp);
      }

      /**
       * Should a navigation bar appear at the bottom of the screen in the current
       * device configuration? A navigation bar may appear on the right side of
       * the screen in certain configurations.
       *
       * @return True if navigation should appear at the bottom of the screen, False otherwise.
       */
      public boolean isNavigationAtBottom() {
          return (mSmallestWidthDp >= 600 || mInPortrait);
      }

      /**
       * Get the height of the system status bar.
       *
       * @return The height of the status bar (in pixels).
       */
      public int getStatusBarHeight() {
          return mStatusBarHeight;
      }

      /**
       * Get the height of the action bar.
       *
       * @return The height of the action bar (in pixels).
       */
      public int getActionBarHeight() {
          return mActionBarHeight;
      }

      /**
       * Does this device have a system navigation bar?
       *
       * @return True if this device uses soft key navigation, False otherwise.
       */
      public boolean hasNavigtionBar() {
          return mHasNavigationBar;
      }

      /**
       * Get the height of the system navigation bar.
       *
       * @return The height of the navigation bar (in pixels). If the device does not have
       * soft navigation keys, this will always return 0.
       */
      public int getNavigationBarHeight() {
          return mNavigationBarHeight;
      }

      /**
       * Get the width of the system navigation bar when it is placed vertically on the screen.
       *
       * @return The width of the navigation bar (in pixels). If the device does not have
       * soft navigation keys, this will always return 0.
       */
      public int getNavigationBarWidth() {
          return mNavigationBarWidth;
      }

      /**
       * Get the layout inset for any system UI that appears at the top of the screen.
       *
       * @param withActionBar True to include the height of the action bar, False otherwise.
       * @return The layout inset (in pixels).
       */
      public int getPixelInsetTop(boolean withActionBar) {
          return (mTranslucentStatusBar ? mStatusBarHeight : 0) + (withActionBar ? mActionBarHeight : 0);
      }

      /**
       * Get the layout inset for any system UI that appears at the bottom of the screen.
       *
       * @return The layout inset (in pixels).
       */
      public int getPixelInsetBottom() {
          if (mTranslucentNavBar && isNavigationAtBottom()) {
              return mNavigationBarHeight;
          } else {
              return 0;
          }
      }

      /**
       * Get the layout inset for any system UI that appears at the right of the screen.
       *
       * @return The layout inset (in pixels).
       */
      public int getPixelInsetRight() {
          if (mTranslucentNavBar && !isNavigationAtBottom()) {
              return mNavigationBarWidth;
          } else {
              return 0;
          }
      }
  }

}
This seems to be the problematic line
B4X:
 SystemBarTintManager tintManager = new SystemBarTintManager();
respectively this one:
B4X:
final Activity act = BA.activity;
as it gave me this report when compiling with the SimpleLibraryCompiler
Starting step: Compiling Java code.
javac 1.8.0_25
C:\Users\Mannes\workspace\TintManager\src\de\donmanfred\b4a\TintManager\SystemBarTintManager.java:105: error: non-static variable activity cannot be referenced from a static context
final Activity act = BA.activity;
^
1 error
I need the Activity obect which is used in the constructor.

Everything i tried so far was wrong. Maybe one of you have any suggestions/tips/hints/solution for me? *rolleye* :)
 
Top