Android Gradle manifestPlaceholders 占位符详解

1)build.gradle->android->defaultConfig内添加如

        manifestPlaceholders = [
                JPUSH_APPKEY : "XXX",//值来自开发者平台取得的AppKey
                JPUSH_CHANNEL: "default_developer",
                design_width_in_dp:360,
                design_height_in_dp:640
        ]

2)如Application中引入需在AndroidManifest.xml中的Application中标签引入

<meta-data android:name="JPUSH_APPKEY" android:value="${JPUSH_APPKEY}"/>

同理android四大组件需引入也是放相应标签
3)java访问数据

        try {
            ApplicationInfo appInfo = getPackageManager().getApplicationInfo(getPackageName(), PackageManager.GET_META_DATA);//Application中
            //ActivityInfo appInfo = getPackageManager().getActivityInfo(getComponentName(), PackageManager.GET_META_DATA);//Activity中
            //services receiver只是改个名字类似
            String JPUSH_APPKEY = appInfo.metaData.getString("JPUSH_APPKEY");
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }