Question

我的应用中有两种产品风味i-e
flavorOne（src / flavorOne / java）和 flavorTwo（src / flavorTwo / java）。 Main（src / main / java）是目录表单，其中两个flavor都在使用这些类。我想从 src / main / java / ActivityA 中的Activity开始活动 src / flavorTwo / java / ActivityB .java。在运行flavorTwo时它可以工作但是当我切换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

下的活动

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));
    }
}

在我更改构建变体flavorTwo时，在下面列出的 SharedActivity（src / main / java /）的包导入时显示错误。

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));

                }
            });
        }
    }
}

这个问题的最佳解决方案是什么？

Answer 1

它失败了，因为当您构建应用时，一次只存在一种产品风味的代码。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，让我们称之为ReplacableActivity.java

为了替换工作，两个产品口味都需要有这个类，主要的源集不会有类

示例：

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，对于所有产品口味，您的构建ReplacableActivity都存在，并且可以从main源集引用。在构建时，只有该特定风味的ReplaceableActivity与应用程序一起打包。现在您的导入将按预期工作来自import com.blah.myApp.ReplaceableActivity;来源集的main。

编辑：

如果您唯一关心的是隐藏或显示单个元素，则上述内容过度。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代码中执行

findViewById(R.id.myHidableFab).setVisibility(BuildConfig.flavorShowsFab ? View.VISIBLE : View.GONE));

Answer 2

您可以使用继承概念并在 gradle 和清单文件中进行很少的更改，而不是为每种口味创建不同的代码，我们可以通过三个步骤来实现这一目标

1）合并应用程序级别build.gradle文件中每种口味的来源集

sourceSets {
         flavorOne {
            java.srcDirs = ['src/main/java','src/flavorOne/java']
        }
    flavorTwo {
            java.srcDirs = ['src/main/java','src/flavorTwo/java']
        }
    }

2）主要技巧发生在这里，为每种口味创建清单，并为其定义启动器活动，但不在主要口味中

在主清单文件中：

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.myapplication">

        <application

    //no launcher defined here

        </application>

    </manifest>

有一个主要文件：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.myapplication">

    <application>
        <activity
            android:name="{Your launcher activity}">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

有两个清单文件：

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        package="com.example.myapplication">

        <application>
            <activity
                android:name="{Your launcher activity}">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />

                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>

    </manifest>

这样在构建gradle时合并清单文件时不会出错

3）因此，在 main java src中，创建BaseSharedActivity.java并编写您的常规实现，在每种形式中 create SharedActivity.java并从定义的启动器活动中调用它们每种口味。

在每种口味的SharedActivity.java中：

public class SharedActivity extends BaseSharedActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
//You can override whatever method you want from BaseSharedActivity here 
}

这样，您就不必为 SharedActivity 添加相同的代码，并且可以为不同风格的同一屏幕提供最大的自定义，您也可以对启动器活动使用相同的逻辑

如何从主目录访问产品类的类？

2 个答案: