Initial Contribution

1 files changed, 121 insertions, 0 deletions

diff --git a/core/java/android/view/Display.java b/core/java/android/view/Display.java
new file mode 100644
index 000000000000..09ebeed543e1
--- /dev/null
+++ b/core/java/android/view/Display.java
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.view;
+
+import android.util.DisplayMetrics;
+
+public class Display
+{
+    /**
+     * Specify the default Display
+     */
+    public static final int DEFAULT_DISPLAY = 0;
+
+    
+    /**
+     * Use the WindowManager interface to create a Display object.
+     * Display gives you access to some information about a particular display
+     * connected to the device.
+     */
+    Display(int display) {
+        // initalize the statics when this class is first instansiated. This is
+        // done here instead of in the static block because Zygote
+        synchronized (mStaticInit) {
+            if (!mInitialized) {
+                nativeClassInit();
+                mInitialized = true;
+            }
+        }
+        mDisplay = display;
+        init(display);
+    }
+    
+    /**
+     * @return index of this display.
+     */
+    public int getDisplayId() {
+        return mDisplay;
+    }
+
+    /**
+     * @return the number of displays connected to the device.
+     */
+    native static int getDisplayCount();
+    
+    /**
+     * @return width of this display in pixels.
+     */
+    native public int getWidth();
+    
+    /**
+     * @return height of this display in pixels.
+     */
+    native public int getHeight();
+
+    /**
+     * @return orientation of this display.
+     */
+    native public int getOrientation();
+
+    /**
+     * @return pixel format of this display.
+     */
+    public int getPixelFormat() {
+        return mPixelFormat;
+    }
+    
+    /**
+     * @return refresh rate of this display in frames per second.
+     */
+    public float getRefreshRate() {
+        return mRefreshRate;
+    }
+    
+    /**
+     * Initialize a DisplayMetrics object from this display's data.
+     * 
+     * @param outMetrics
+     */
+    public void getMetrics(DisplayMetrics outMetrics) {
+        outMetrics.widthPixels  = getWidth();
+        outMetrics.heightPixels = getHeight();
+        outMetrics.density      = mDensity;
+        outMetrics.scaledDensity= outMetrics.density;
+        outMetrics.xdpi         = mDpiX;
+        outMetrics.ydpi         = mDpiY;
+    }
+
+    /*
+     * We use a class initializer to allow the native code to cache some
+     * field offsets.
+     */
+    native private static void nativeClassInit();
+    
+    private native void init(int display);
+
+    private int         mDisplay;
+    // Following fields are initialized from native code
+    private int         mPixelFormat;
+    private float       mRefreshRate;
+    private float       mDensity;
+    private float       mDpiX;
+    private float       mDpiY;
+    
+    private static final Object mStaticInit = new Object();
+    private static boolean mInitialized = false;
+}
+