前言
最近写了一个坑爹的方便其他方集成的微信，支付宝分享SDK，其中的appid等参数，本人使用的配置化，就遇到了在Gradle manifestPlaceholders自定义变量取值问题
一.声明变量值
申明变量的原理
看过源码，其实就是一个HashMap的对象，我们在build.gradle中写入，然后映射到AndroidMainfest.xml中，HashMap对象放置在activityInfo.metaData中，我们可以通过activityInfo.metaData.keyset（）查看所有设置的值
首先了解，在build.gradle中如何添加变量可以写在如下的位置：
第一种：
defaultConfig {
applicationId "xxx.xxxxxx.xxxxxx"
minSdkVersion 20
targetSdkVersion 18
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
manifestPlaceholders = [
"WEATCH_APPID": "--------------",
]
}
buildTypes {
debug {
signingConfig signingConfigs.debug
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'
manifestPlaceholders = [
"WEATCH_APPID": "--------------",
]
}
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
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第二种：
compileSdkVersion 18
buildToolsVersion '27.0.2'
defaultConfig {
applicationId "xxx.xxxxx.xxxxx"
minSdkVersion 20
targetSdkVersion 18
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
manifestPlaceholders = [
"WEATCH_APPID": "dddddddd",
]
}
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第三种：
compileSdkVersion 18
buildToolsVersion '27.0.2'
defaultConfig {
applicationId "xxx.xxxxxx.xxxxxxx"
minSdkVersion 20
targetSdkVersion 18
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
productFlavors {
google {
manifestPlaceholders.put("UMENG_CHANNEL","google")
}
baidu {
manifestPlaceholders.put("UMENG_CHANNEL","baidu")
}
}
}
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二.AndroidMainfest.xml中使用
第一种：直接使用
比如极光receiver
android:name=".jpush.MyReceiver" android:enabled="true"> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 比如微信支付 android:name=".wxapi.WXPayEntryActivity" android:exported="true" android:launchMode="singleTop"> 1 2 3 4 5 6 7 8 9 10 11 三.在Java类中获取[在service,receiver，Activity，Application中获取值] 原理：通过androidMainfest.xml把值反射到对应类标签，设置value的key值，在java类中通过key取值得到value 第一种：Activity类中获取build.gradle申明变量 AndroidMainfest.xml中代码 package="xxx.xxxx.xxxxx"> android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Activity中代码 import android.app.Activity; import android.content.pm.ActivityInfo; import android.content.pm.PackageManager; import android.os.Bundle; import android.view.View; import android.widget.Button; import com.reach.doooly.utils.StringUtlis; import com.reachdoooly.pay.utils.ReachLogs; /** * Created by Albert on 2018/5/22. */ public class PayTestActivity extends Activity { private Button ali_pay;//阿里支付 private Button weachat_pay;//微信支付 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate ( savedInstanceState ); setContentView ( R.layout.pay_test ); ActivityInfo activityInfo = null; String value =""; try { activityInfo = getPackageManager().getActivityInfo(getComponentName(), PackageManager.GET_META_DATA); value=activityInfo.metaData.getString("test"); } catch (PackageManager.NameNotFoundException e) { } if(!StringUtlis.isEmpty ( value )){ ReachLogs.e ("fuqinming","appId:"+value); } weachat_pay = (Button) findViewById ( R.id.wechat_pay ); weachat_pay.setOnClickListener ( new View.OnClickListener () { @Override public void onClick(View v) { //new NewClass().createNewPay(PayTestActivity.this); // Toast.makeText ( PayTestActivity.this, PayUtils.getAppPackageName ( PayTestActivity.this ), Toast.LENGTH_SHORT ).show (); } } ); } } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 第二种:Application类中获取build.gradle申明变量 AndroidMainfest.xml中代码 package="xxx.xxxx.xxxxx"> android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 在Application中代码 private void getWeatchAppID(){ String value =""; try { ApplicationInfo applicationInfo=getPackageManager().getApplicationInfo(getPackageName(),PackageManager.GET_META_DATA); value=applicationInfo.metaData.getString("test"); } catch(Exception e) { value=""; } } 1 2 3 4 5 6 7 8 9 第三种：在SERVICE,RECEIVER中获取 这两种基本上差不多就不分开写了，就只写一种，另外一种赵淼画瓢即可。 在AndroidMainfest.xml中代码 android:name=".jpush.MyReceiver" android:enabled="true"> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 在receiver类中代码 private void getWeatchAppID(){ String value =""; try { ApplicationInfo applicationInfo=activity.getPackageManager().getServiceInfo(ComponentName,PackageManager.GET_META_DATA); ApplicationInfo applicationInfo=activity.getPackageManager().getReceiverInfo(ComponentName,PackageManager.GET_META_DATA); //只有这里不同，亲们注意哈getReceiverInfo，getServiceInfo value=applicationInfo.metaData.getString("test"); } catch(Exception e) { value=""; } } 1 2 3 4 5 6 7 8 9 10 11 4.特别需要注意 因为在我的项目中，是在core包中写入appID与appSercert等信息，就需要特别注意，我的代码是在core包中有一个父Activity，如何在父activity中获取appid，需要特别注意 import android.app.Activity; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.widget.Toast; import com.tencent.mm.opensdk.modelbase.BaseReq; import com.tencent.mm.opensdk.modelbase.BaseResp; import com.tencent.mm.opensdk.modelpay.PayReq; import com.tencent.mm.opensdk.openapi.IWXAPI; import com.tencent.mm.opensdk.openapi.IWXAPIEventHandler; import com.tencent.mm.opensdk.openapi.WXAPIFactory; /** * 微信支付base类 */ public class WeatchPayBaseActivity extends Activity implements IWXAPIEventHandler { private IWXAPI api; private PayReq payReq;//微信支付 public void initWXAPI(Activity context) { String APP_ID =""; ReachLogs.e ("fuqinming","packagename:"+getPackageName ()); -----第一种写法---- try { ApplicationInfo activityInfo =this.getPackageManager().getApplicationInfo(this.getPackageName (), PackageManager.GET_META_DATA); APP_ID=activityInfo.metaData.getString("WEATCG_APPID"); } catch (Exception e) { } if(null == APP_ID || "".equals ( APP_ID.trim () ) || "null".equals ( APP_ID.trim () )){ ReachLogs.e ("fuqinming","appId:"); }else{ ReachLogs.e ("fuqinming","appId:"+APP_ID); } ----第二种写法---- try { ApplicationInfo appInfo = getPackageManager ().getApplicationInfo ( getPackageName (), PackageManager.GET_META_DATA ); APP_ID=appInfo.metaData.getString("WEATCH_APPID"); }catch (Exception e){ } ReachLogs.e ("fuqinming","APP_ID:"+APP_ID); payReq = new PayReq (); if (null == APP_ID || "".equals ( APP_ID.trim () ) || "null".equals ( APP_ID.trim () )) { throw new NullPointerException (); } // 初始化分享 api = WXAPIFactory.createWXAPI ( context, APP_ID, true ); api.handleIntent ( context.getIntent (), this ); api.registerApp ( APP_ID ); } @Override public void onReq(BaseReq baseReq) { } /*** * 微信支付[NATIVIE TO HTML] * * @param weachPayVo * @add 2017-10-10 */ public void wechatPay(WeachPayBeanVo weachPayVo) { if(payReq==null){ throw new NullPointerException ("payReq The object is not set"); } if (payReq != null && weachPayVo != null && !WeacthConsts.isEmpty(weachPayVo.getAppid()) && !WeacthConsts.isEmpty(weachPayVo.getNoncestr()) && !WeacthConsts.isEmpty(weachPayVo.getPackageValue()) && !WeacthConsts.isEmpty(weachPayVo.getPartnerid()) && !WeacthConsts.isEmpty(weachPayVo.getPrepayid()) && !WeacthConsts.isEmpty(weachPayVo.getSign()) && !WeacthConsts.isEmpty(weachPayVo.getTimestamp())) { payReq.appId = weachPayVo.getAppid(); payReq.partnerId = weachPayVo.getPartnerid();// 微信支付分配的商户号 payReq.prepayId = weachPayVo.getPrepayid();// 微信返回的支付交易会话ID payReq.packageValue = weachPayVo.getPackageValue();// 扩展字段占时填固定 payReq.nonceStr = weachPayVo.getNoncestr();// 随机字符串 payReq.timeStamp = weachPayVo.getTimestamp();// 时间戳 payReq.sign = weachPayVo.getSign();// 签名 api.sendReq(payReq); } else { Toast.makeText (this,getString(R.string.error_order_msg),Toast.LENGTH_SHORT); } } // 第三方应用发送到微信的请求处理后的响应结果，会回调到该方法 public void onResp(BaseResp resp) { } } --------------------- 作者：CherryChen88 来源：CSDN 原文：https://blog.csdn.net/ONLYMETAGAIN/article/details/80497789 版权声明：本文为博主原创文章，转载请附上博文链接！