Android Gradle manifestPlaceholders自定义变量取值

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'
        }
    }

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",
        ]
    }

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")
            }
        }
    }

二.AndroidMainfest.xml中使用

第一种：直接使用
比如极光receiver

<receiver
            android:name=".jpush.MyReceiver"
            android:enabled="true">
            <intent-filter>
                <!--Required 用户注册SDK的intent-->
                <action android:name="cn.jpush.android.intent.REGISTRATION" />
                <!--Required 用户接收SDK消息的intent-->
                <action android:name="cn.jpush.android.intent.MESSAGE_RECEIVED" />
                <!--Required 用户接收SDK通知栏信息的intent-->
                <action android:name="cn.jpush.android.intent.NOTIFICATION_RECEIVED" />
                <!--Required 用户打开自定义通知栏的intent-->
                <action android:name="cn.jpush.android.intent.NOTIFICATION_OPENED" />
                <!-- 接收网络变化 连接/断开 since 1.6.3 -->
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
                <!--<action android:name="cn.jpush.android.intent.CONNECTION" />-->
                <category android:name="${JPUSH_PKGNAME}" />
            </intent-filter>
        </receiver>

比如微信支付

        <!-- 支付回调页面 -->
        <activity
            android:name=".wxapi.WXPayEntryActivity"
            android:exported="true"
            android:launchMode="singleTop">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:scheme="${WEATCH_APPID}" />
            </intent-filter>
        </activity>

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

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="xxx.xxxx.xxxxx">
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".PayTestActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
           <meta-data android:name="test" android:value="${WEATCH_APPID}"/>//这一句起到至关重要作用
        </activity>
    </application>
</manifest>

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 ();
            }
        } );
    }
}

第二种:Application类中获取build.gradle申明变量

AndroidMainfest.xml中代码

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="xxx.xxxx.xxxxx">
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".PayTestActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data android:name="test" android:value="${WEATCH_APPID}"/>//这一句起到至关重要作用
    </application>
</manifest>

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="";
          }
      }

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

<receiver
            android:name=".jpush.MyReceiver"
            android:enabled="true">
            <intent-filter>
                <!--Required 用户注册SDK的intent-->
                <action android:name="cn.jpush.android.intent.REGISTRATION" />
                <!--Required 用户接收SDK消息的intent-->
                <action android:name="cn.jpush.android.intent.MESSAGE_RECEIVED" />
                <!--Required 用户接收SDK通知栏信息的intent-->
                <action android:name="cn.jpush.android.intent.NOTIFICATION_RECEIVED" />
                <!--Required 用户打开自定义通知栏的intent-->
                <action android:name="cn.jpush.android.intent.NOTIFICATION_OPENED" />
                <!-- 接收网络变化 连接/断开 since 1.6.3 -->
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
                <!--<action android:name="cn.jpush.android.intent.CONNECTION" />-->
                <category android:name="${JPUSH_PKGNAME}" />
            </intent-filter>
            <meta-data android:name="test" android:value="${WEATCH_APPID}"/>//这一句起到至关重要作用
        </receiver>

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="";
          }
      }

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) {

    }
}

这里，需要注意如果你的变量申明和映射写在core包中，就需要在core包中的activity中加入this.,如果不是，是写在app中的activity中，那么就应该是传入的值 context.,否则直接报错

后记：

ES转AS之后坑蛮多，慢慢填，慢慢写，一直都在成长中