如何从主目录访问产品风味类？

提问者：小点点

如何从主目录访问产品风味类？

在我的应用程序中有两种产品风格，即 i-e flavorOne（src/
flavorOne/java）和 flavorTwo（src/flavorTwo/java）。Main （src/main/java）是目录形式，其中两种风格都使用这些类。我想从 src/main/java/ActivityA 中的活动启动活动 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 SharedActivity.java in dir src/main/java/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));

                }
            });
        }
    }
}

FlavorOneMainActivity.java下的活性

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/FflavorTwoMainActivity.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));
    }
}

当我更改构建变体flavorTwo时，显示了下面列出的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));

                }
            });
        }
    }
}

这个问题的最佳解决方案是什么？

共2个答案

匿名用户

它失败了，因为当您构建应用程序时，一次只存在一种产品风格的代码。因此，您真正想做的是在两种产品风格中使用一个类名。

想象一下，我们有一个类，我们希望根据产品口味替换它，让我们称之为ReplacableActivity.java

为了使替换生效，两种产品风格都需要有这个类，而main的源集没有这个类

例子：

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，对于所有产品类型，您的构建都存在< code>ReplacableActivity，并且可以从< code>main源集中引用。在构建时，只有特定风格的< code>ReplaceableActivity与应用程序打包在一起。现在您的导入将按预期工作< code > import com . blah . myapp . replaceable activity；来自< code>main源代码集。

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));

匿名用户

不是为每种口味创建不同的代码，而是通过使用继承概念和对gradle和清单文件的少量更改来维护相同的代码，我们可以通过三个步骤来实现这一点

1）在应用级 build.gradle 文件中合并每种风格的源代码集

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，为每个风格创建清单，并为它们定义了启动器活动，但不在主风格中

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>

味道中最重要的一个文件:

<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>

在风味二清单文件中：

 <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>

这样我们就不会在构建gradle时合并清单文件时出错

3)因此，在主java src中，创建< code > basesharedactivity . Java 并编写您的常规实现，在每个风格中创建< code>SharedActivity.java,并从每个风格中定义的启动器活动中调用它们。

在共享活动中.java每种口味：

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，您就不会为SharedActivity添加相同的代码，并且可以以不同的风格为同一屏幕提供最大的定制，您也可以为启动器活动使用相同的逻辑