build: fix minor issue in build system

README.md

@@ -165,18 +165,12 @@ cd kantv
  - download android-ndk-r26c to prebuilts/toolchain, skip this step if android-ndk-r26c is already exist
 
 ```
+. build/envsetup.sh
 
 ./build/prebuild-download.sh
 
 ```
 
- - environment setup
-
- ```
-
- . build/envsetup.sh
-
- ```
 
  - modify <a href="https://github.com/zhouwg/kantv/blob/master/build/envsetup.sh#L88">build/envsetup.sh</a> accordingly before launch build
 

build-all.sh

@@ -22,6 +22,17 @@ function build_init()
     echo -e "build project ${PROJECT_NAME} on ${BUILD_TIME} by ${BUILD_USER} for ${TEXT_RED} target ${BUILD_TARGET} with arch ${BUILD_ARCHS} in ${PROJECT_BUILD_TYPE} mode on host ${BUILD_HOST} ${TEXT_RESET}\n"
 
     show_pwd
+
+    if [ "${BUILD_TARGET}" == "android" ]; then
+        check_ndk
+        if [ $? -ne 0 ]; then
+            printf "failed to check android ndk\n"
+            printf "pls run ./build/prebuild-download.sh firstly\n"
+            printf "\n\n"
+            exit 1
+        fi
+
+    fi
 }
 
 

build/envsetup.sh

@@ -277,8 +277,8 @@ function lunch()
         elif [ "${project}" == "kantv-wasm" ]; then
             export BUILD_TARGET=wasm
         else
-            #default target is linux
-            export BUILD_TARGET=linux
+            #default target is android
+            export BUILD_TARGET=android
         fi
 
         setup_env

build/prebuild-download.sh

@@ -32,6 +32,11 @@ fi
 
 if [ ${is_android_ndk_exist} -eq 0 ]; then
     echo -e "begin downloading android ndk \n"
+
+    if [ ! -d ${PROJECT_ROOT_PATH}/prebuilts/toolchain ]; then
+        mkdir -p ${PROJECT_ROOT_PATH}/prebuilts/toolchain
+    fi
+
     wget --no-config --quiet --show-progress -O ${PROJECT_ROOT_PATH}/prebuilts/toolchain/android-ndk-r25c-linux.zip  https://dl.google.com/android/repository/android-ndk-r25c-linux.zip
     wget --no-config --quiet --show-progress -O ${PROJECT_ROOT_PATH}/prebuilts/toolchain/android-ndk-r26c-linux.zip  https://dl.google.com/android/repository/android-ndk-r26c-linux.zip
 

build/public.sh

@@ -112,15 +112,18 @@ function check_ndk()
     if [ -z ${ANDROID_NDK} ]; then
         echo -e "${TEXT_RED}NDK ${ANDROID_NDK} not exist, pls check...${TEXT_RESET}\n"
         #exit 1
+        return 1;
     fi
 
     if [ ! -d ${ANDROID_NDK} ]; then
         echo -e "${TEXT_RED}NDK ${ANDROID_NDK} not exist, pls check...${TEXT_RESET}\n"
         #exit 1
+        return 1;
     fi
 
     if [ ! -f ${ANDROID_NDK}/build/cmake/android.toolchain.cmake ]; then
         echo -e "${TEXT_RED}NDK ${ANDROID_NDK} not exist, pls check...${TEXT_RESET}\n"
+        return 1;
     fi
 }