AndroidStudio中Android与Lua最简单的调用

配置好LUA和NDK

一、Git上下载AndroLua项目，导入AndroidStudio
https://github.com/mkottman/AndroLua

二、将这个Module做为Module Dependencies，运行目标项目时，会出现这样一张操作界面

若将这个Module打包成jar，则不会出现此界面
Module的处理
1.build.gradle中，将plugin改为library

2.Module Setting中删除Application ID

3.jni->luajava->luajava.c修改include信息

4.make module，在build/intermediates/bundles/release 下得到jar文件classes.jar
5.将jar文件添加到目标Module中

三、android与lua文件的相互调用
res/raw/luatest.lua
luatest.lua

MainActivity.java

public class MainActivity extends Activity {

    private LuaState mLuaState;
    private EditText mFirst;
    private EditText mSecond;
    private TextView mResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mLuaState = LuaStateFactory.newLuaState();
        mLuaState.openLibs();

        mFirst = (EditText) this.findViewById(R.id.first);
        mSecond = (EditText) this.findViewById(R.id.second);
        mResult = (TextView) this.findViewById(R.id.result);

        Button android = (Button) this.findViewById(R.id.android);
        android.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (checkInput()) {
                    mLuaState.LdoString(readStream(getResources().openRawResource(R.raw.luatest)));
                    mLuaState.getField(LuaState.LUA_GLOBALSINDEX, "add");
                    mLuaState.pushNumber(Integer.parseInt(mFirst.getText().toString()));
                    mLuaState.pushNumber(Integer.parseInt(mSecond.getText().toString()));
                    mLuaState.call(2, 1);//2个参数，1个返回值
                    mLuaState.setField(LuaState.LUA_GLOBALSINDEX, "result");
                    LuaObject result = mLuaState.getLuaObject("result");
                    mResult.setText(result.toString());
                }
            }
        });


        Button lua = (Button) this.findViewById(R.id.lua);
        lua.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (checkInput()) {
                    mLuaState.LdoString(readStream(getResources().openRawResource(R.raw.luatest)));
                    mLuaState.getField(LuaState.LUA_GLOBALSINDEX, "setResult");
                    mLuaState.pushJavaObject(mResult);
                    mLuaState.pushNumber(Integer.parseInt(mFirst.getText().toString()));
                    mLuaState.pushNumber(Integer.parseInt(mSecond.getText().toString()));
                    mLuaState.call(3, 0);//3个参数，0个返回值
                }
            }
        });
    }

    private boolean checkInput() {
        if (mFirst.getText().length() == 0 || mSecond.getText().length() == 0) {
            Toast.makeText(MainActivity.this, "请输入数字", Toast.LENGTH_LONG).show();
            return false;
        }
        return true;
    }


    private String readStream(InputStream is) {
        try {
            ByteArrayOutputStream bo = new ByteArrayOutputStream();
            int i = is.read()；
            while (i != -1) {
                bo.write(i);
                i = is.read();
            }
            return bo.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_margin="10dp"
        android:gravity="center_vertical"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/first"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:inputType="number"
            android:hint="first" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="+" />

        <EditText
            android:id="@+id/second"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:inputType="number"
            android:hint="second" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="=" />

        <TextView
            android:id="@+id/result"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="\?" />
    </LinearLayout>

    <Button
        android:id="@+id/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Android"/>

    <Button
        android:id="@+id/lua"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Lua"/>
</LinearLayout>