android– 如何从主目录访问产品类的类？

概述我的应用程序i-e有两种产品风味flavorOne(src/flavorOne/java)和flavorTwo(src/flavorTwo/java).Main(src/main/java)是目录形式,其中两个flavor都在使用类.我想从src/main/java/ActivityA中的Activity启动活动src/flavorTwo/java/ActivityB.java.在运行

我的应用程序i-e有两种产品风味
flavorOne(src / flavorOne / java)和flavorTwo(src / flavorTwo / java). Main(src / main / java)是目录形式,其中两个flavor都在使用类.我想从src / main / java / ActivityA中的Activity启动活动src / flavorTwo / java / ActivityB.java.在运行flavorTwo时它可以正常工作但是当我切换flavorOne时它会显示导入com.packagename.ActivityB错误.

+ App // module    |- src       |- main// shared srcDir          |- java           |- SharedActivity       + flavorOne          |- java           |- FlavorOneActivity       + flavorTwo          |- java           |- FlavorTwoActivity

这是dir src / main / java / SharedActivity.java中的SharedActivity.java

package com.example.buildvariants;import androID.content.Intent;import androID.os.Bundle;import androID.support.design.Widget.floatingActionbutton;import androID.support.design.Widget.Snackbar;import androID.support.v7.app.AppCompatActivity;import androID.support.v7.Widget.Toolbar;import androID.vIEw.VIEw;/**********************  works if it is in flavorOne otherwise it shows error on this package import ***********/import com.example.buildvariants.flavorOne.LoginActivity;public class SharedActivity extends AppCompatActivity {    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        Toolbar toolbar = (Toolbar) findVIEwByID(R.ID.toolbar);        setSupportActionbar(toolbar);        floatingActionbutton fab = (floatingActionbutton) findVIEwByID(R.ID.fab);        //if flavor is flavorTwo hIDe the fab        //else flavor is flavorOne show fab and launch activity under flavorOne/java/LoginActivity.java        if (BuildConfig.FLAVOR.equalsIgnoreCase("flavorTwo")) {            fab.setVisibility(VIEw.GONE);        } else {            fab.setVisibility(VIEw.VISIBLE);            fab.setonClickListener(new VIEw.OnClickListener() {                @OverrIDe                public voID onClick(VIEw vIEw) {                    Snackbar.make(vIEw, "Replace with your own action", Snackbar.LENGTH_LONG)                            .setAction("Action", null).show();                    startActivity(new Intent(SharedActivity.this, LoginActivity.class));                }            });        }    }}

flavorOne src / flavorOne / FlavorOneMainActivity.java下的活动

package com.example.buildvariants.flavorOne;import androID.content.Intent;import androID.os.Bundle;import androID.support.v7.app.AppCompatActivity;import com.example.buildvariants.R;import com.example.buildvariants.SharedActivity;public class FlavorOneMainActivity extends AppCompatActivity {    private static final String TAG =FlavorOneMainActivity.class.getSimplename() ;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.flavor_one_activity_main);        Intent intent = new Intent(FlavorOneMainActivity.this, SharedActivity.class);        startActivity(intent);    }}

flavorTwo src / flavorOne / FlavorTwoMainActivity.java下的Activity

package com.example.buildvariants.flavorTwo;import androID.content.Intent;import androID.os.Bundle;import androID.support.v7.app.AppCompatActivity;import com.example.buildvariants.R;import com.example.buildvariants.SharedActivity;public class FlavorTwoMainActivity extends AppCompatActivity {    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.flavor_two_activity_main);        startActivity(new Intent(FlavorTwoMainActivity.this, SharedActivity.class));    }}

当我更改构建变体flavorTwo时,显示下面列出的SharedActivity(src / main / java /)的包导入错误.

package com.example.buildvariants;import androID.content.Intent;import androID.os.Bundle;import androID.support.design.Widget.floatingActionbutton;import androID.support.design.Widget.Snackbar;import androID.support.v7.app.AppCompatActivity;import androID.support.v7.Widget.Toolbar;import androID.vIEw.VIEw;/********error  on package import***********/import com.example.buildvariants.flavorOne.LoginActivity;public class SharedActivity extends AppCompatActivity {    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        Toolbar toolbar = (Toolbar) findVIEwByID(R.ID.toolbar);        setSupportActionbar(toolbar);        floatingActionbutton fab = (floatingActionbutton) findVIEwByID(R.ID.fab);        //if flavor is flavorTwo hIDe the fab        //else flavor is flavorOne show fab and launch activity under flavorOne/java/LoginActivity.java        if (BuildConfig.FLAVOR.equalsIgnoreCase("flavorTwo")) {            fab.setVisibility(VIEw.GONE);        } else {            fab.setVisibility(VIEw.VISIBLE);            fab.setonClickListener(new VIEw.OnClickListener() {                @OverrIDe                public voID onClick(VIEw vIEw) {                    Snackbar.make(vIEw, "Replace with your own action", Snackbar.LENGTH_LONG)                            .setAction("Action", null).show();                    startActivity(new Intent(SharedActivity.this, LoginActivity.class));                }            });        }    }}

什么是这个问题的最佳解决方案？

解决方法:

它失败了,因为当您构建应用程序时,一次只存在一个产品风格的代码.所以你真正想做的是在两种产品口味中使用一个类名.

想象一下,我们想要根据产品风格替换一个类,我们称之为ReplacableActivity.java

为了替换工作,两种产品风格都需要具有此类,而main的源代码集将不具有该类

例：

src/main/com/blah/myApp/ReplacableActivity #<- should not exist# exists and is the implementation of ReplacableActivity for `flavorOne`src/flavorOne/com/blah/myApp/ReplacableActivity.java# exists and is the implementation of ReplaceableActivity.java for `flavorTwo`src/flavorTwo/com/blah/myApp/ReplacableActivity.java

现在,对于所有产品风格,您的构建ReplacableActivity都存在,并且可以从主要源集引用.在构建时,只有该特定flavor的ReplaceableActivity与app一起打包.现在您的导入将按预期工作
import com.blah.myApp.ReplaceableActivity;来自主要的源集.

编辑：

如果您唯一关心的是隐藏或显示单个元素,那么上述内容就是矫枉过正.从BuildConfigFIEld获取它会容易得多

androID {    productFlavors {        flavorOne {            buildConfigFIEld "boolean", "flavorShowsFab", 'false'        }        flavorTwo {            buildConfigFIEld 'boolean', 'flavorShowsFab', 'true'        }    }

然后在你的java代码中做

findVIEwByID(R.ID.myHIDableFab).setVisibility(BuildConfig.flavorShowsFab ? VIEw.VISIBLE : VIEw.GONE));

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