Various fixes in android sample NativeActivity.

samples/android/native-activity/.cproject

@@ -20,7 +20,7 @@
 					<folderInfo id="0.882924228." name="/" resourcePath="">
 						<toolChain id="org.eclipse.cdt.build.core.prefbase.toolchain.1667980868" name="No ToolChain" resourceTypeBasedDiscovery="false" superClass="org.eclipse.cdt.build.core.prefbase.toolchain">
 							<targetPlatform id="org.eclipse.cdt.build.core.prefbase.toolchain.1667980868.2108168132" name=""/>
-							<builder autoBuildTarget="" command="&quot;${NDKROOT}/ndk-build.cmd&quot;" enableAutoBuild="true" enableCleanBuild="false" id="org.eclipse.cdt.build.core.settings.default.builder.328915772" incrementalBuildTarget="" keepEnvironmentInBuildfile="false" managedBuildOn="false" name="Gnu Make Builder" superClass="org.eclipse.cdt.build.core.settings.default.builder"/>
+							<builder autoBuildTarget="" command="${NDKROOT}/ndk-build.cmd" enableAutoBuild="true" enableCleanBuild="false" id="org.eclipse.cdt.build.core.settings.default.builder.328915772" incrementalBuildTarget="" keepEnvironmentInBuildfile="false" managedBuildOn="false" name="Gnu Make Builder" superClass="org.eclipse.cdt.build.core.settings.default.builder"/>
 							<tool id="org.eclipse.cdt.build.core.settings.holder.libs.630148311" name="holder for library settings" superClass="org.eclipse.cdt.build.core.settings.holder.libs"/>
 							<tool id="org.eclipse.cdt.build.core.settings.holder.525090327" name="Assembly" superClass="org.eclipse.cdt.build.core.settings.holder">
 								<inputType id="org.eclipse.cdt.build.core.settings.holder.inType.1491216279" languageId="org.eclipse.cdt.core.assembly" languageName="Assembly" sourceContentType="org.eclipse.cdt.core.asmSource" superClass="org.eclipse.cdt.build.core.settings.holder.inType"/>

samples/android/native-activity/AndroidManifest.xml

@@ -10,6 +10,7 @@
 
         <activity android:name="CvNativeActivity"
                   android:label="@string/app_name"
+                  android:screenOrientation="landscape"
                   android:configChanges="orientation|keyboardHidden">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -17,7 +18,9 @@
                 </intent-filter>
             </activity>
         <activity android:name="android.app.NativeActivity"
-                  android:label="@string/app_name">
+                  android:label="@string/app_name"
+                  android:screenOrientation="landscape"
+                  android:configChanges="keyboardHidden|orientation">
             <meta-data android:name="android.app.lib_name"
                     android:value="native_activity" />
         </activity>

samples/android/native-activity/jni/Android.mk

@@ -7,7 +7,7 @@ include ../../sdk/native/jni/OpenCV.mk
 LOCAL_MODULE    := native_activity
 LOCAL_SRC_FILES := native.cpp
 LOCAL_LDLIBS    += -lm -llog -landroid
-LOCAL_STATIC_LIBRARIES := android_native_app_glue
+LOCAL_STATIC_LIBRARIES += android_native_app_glue
 
 include $(BUILD_SHARED_LIBRARY)
 

samples/android/native-activity/jni/native.cpp

@@ -78,18 +78,29 @@ static void engine_draw_frame(Engine* engine, const cv::Mat& frame)
         return;
     }
 
-    void* pixels = buffer.bits;
+    int32_t* pixels = (int32_t*)buffer.bits;
 
     int left_indent = (buffer.width-frame.cols)/2;
     int top_indent = (buffer.height-frame.rows)/2;
 
-    for (int yy = top_indent; yy < std::min(frame.rows+top_indent, buffer.height); yy++)
+    if (top_indent > 0)
     {
-        unsigned char* line = (unsigned char*)pixels + left_indent*4*sizeof(unsigned char);
-        size_t line_size = std::min(frame.cols, buffer.width)*4*sizeof(unsigned char);
+        memset(pixels, 0, top_indent*buffer.stride*sizeof(int32_t));
+        pixels += top_indent*buffer.stride;
+    }
+
+    for (int yy = 0; yy < frame.rows; yy++)
+    {
+        if (left_indent > 0)
+        {
+            memset(pixels, 0, left_indent*sizeof(int32_t));
+            memset(pixels+left_indent+frame.cols, 0, (buffer.stride-frame.cols-left_indent)*sizeof(int32_t));
+        }
+        int32_t* line = pixels + left_indent;
+        size_t line_size = frame.cols*4*sizeof(unsigned char);
         memcpy(line, frame.ptr<unsigned char>(yy), line_size);
         // go to next line
-        pixels = (int32_t*)pixels + buffer.stride;
+        pixels += buffer.stride;
     }
     ANativeWindow_unlockAndPost(engine->app->window);
 }