本篇内容介绍了“linux 命令行下怎么使用android sdk 以及ndk”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
首先保证已经安装了java,sdk,ndk 相关的一些包，并有类似如下的配置:
export NDK_ROOT=/home/develop/android-ndk-r9c export SDK_ROOT=/home/develop/adt-bundle-linux-x86_64-20131030/sdk PATH=$PATH:$SDK_ROOT/tools PATH=$PATH:$NDK_ROOT export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64
mkdir proj.android cd proj.android android create project -k wy.first -a helloandroid -n chinease -t android-17 -p ./
其中 -k 指定包名(必选)
-a 指定activity名(必选)
-t指定target(必选)，例如此处android-17对于android4.2
-n指定工程名(可选) ，若不指定该选项，则默认使用activity名字作为工程名字。
-p 指定工程目录(必选)
运行完毕会自动生成src/wy/first/helloandroid.java源文件：
package wy.first;
import android.app.Activity;
import android.os.Bundle;
public class helloandroid extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}ant debug
ant installd
上面两个命令也可以ant debug install一次完成，ant的命令部分不在赘述，可自行键入ant help查看：
kimo@debian-desktop:~/proj.android$ ant help Buildfile: /home/kimo/proj.android/build.xml help: [echo] Android Ant Build. Available targets: [echo] help: Displays this help. [echo] clean: Removes output files created by other targets. [echo] This calls the same target on all dependent projects. [echo] Use 'ant nodeps clean' to only clean the local project [echo] debug: Builds the application and signs it with a debug key. [echo] The 'nodeps' target can be used to only build the [echo] current project and ignore the libraries using: [echo] 'ant nodeps debug' [echo] release: Builds the application. The generated apk file must be [echo] signed before it is published. [echo] The 'nodeps' target can be used to only build the [echo] current project and ignore the libraries using: [echo] 'ant nodeps release' [echo] instrument:Builds an instrumented package and signs it with a [echo] debug key. [echo] test: Runs the tests. Project must be a test project and [echo] must have been built. Typical usage would be: [echo] ant [emma] debug install test [echo] emma: Transiently enables code coverage for subsequent [echo] targets. [echo] install: Installs the newly build package. Must either be used [echo] in conjunction with a build target (debug/release/ [echo] instrument) or with the proper suffix indicating [echo] which package to install (see below). [echo] If the application was previously installed, the [echo] application is reinstalled if the signature matches. [echo] installd: Installs (only) the debug package. [echo] installr: Installs (only) the release package. [echo] installi: Installs (only) the instrumented package. [echo] installt: Installs (only) the test and tested packages (unless [echo] nodeps is used as well. [echo] uninstall: Uninstalls the application from a running emulator or [echo] device. Also uninstall tested package if applicable [echo] unless 'nodeps' is used as well.
手机上的运行效果：
哇塞，居然自带hello world，不明觉厉有木有，看来以后我们这种只会写hello world的人都没法混了，不行，作为一个专注hello world 30年的无脑码农，一定要把这个主动权夺回来！！！搜索了一番才知道其实是刚刚android create project的时候，创建了一个默认的xml界面布局文件res/layout/main.xml，默认代码如下
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Hello World, helloandroid" /> </LinearLayout>
所以为了能在代码中控制那个TextView控件，我们在TextView节点中给它加上一行id属性
android:id="@+id/myTextView"
然后修改src/wy/first/helloandroid.java文件
package wy.first;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView; //add
public class helloandroid extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView myTextView = (TextView) findViewById(R.id.myTextView); //add
myTextView.setText("不写可以么"); //add
}
}再次ant debug install，运行效果如下，恩，这才是真正的hello world嘛
为了个java代码增加本地jni调用，再次修改src/wy/first/helloandroid.java
package wy.first;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class helloandroid extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView myTextView = (TextView) findViewById(R.id.myTextView);
myTextView.setText(stringFromJNI());//modify
}
public native String stringFromJNI();//add
static {
System.loadLibrary("testso"); //add
}
}javah -classpath bin/classes -d jni wy.first.helloandroid 错误: 无法访问android.app.Activity 找不到android.app.Activity的类文件
神马情况，居然又给我报错，折腾半小时后终于有了点眉目，总之就是找不到android.app.Activity包，需要手动指定一个参数，我这里以target为android-17为例:
javah -classpath bin/classes -bootclasspath /home/develop/adt-bundle-linux-x86_64-20131030/sdk/platforms/android-17/android.jar -d jni wy.first.helloandroid
果断执行成功，此时我们的当前目录下自动生成了一个jni目录，以及jni/wy_first_helloandroid.h头文件。
现在要做的就是用c实现该头文件中申明的函数，so，创建 jni/wy_first_helloandroid.c文件
#include <string.h>
#include <jni.h>
#include "wy_first_helloandroid.h"
JNIEXPORT jstring JNICALL Java_wy_first_helloandroid_stringFromJNI(JNIEnv *env, jobject obj)
{
return (*env)->NewStringUTF(env, "hello ,么以可写不");
}创建jni/Android.mk文件，其中LOCAL_MODULE的值应与java代码中的一致
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := testso LOCAL_SRC_FILES := wy_first_helloandroid.c include $(BUILD_SHARED_LIBRARY)
然后就可以编译so了，键入ndk-build回车
kimo@debian-desktop:~/proj.android$ ndk-build [armeabi] Install : libtestso.so => libs/armeabi/libtestso.so
果断so就生成好了，再次ant debug install，运行效果如下
“linux 命令行下怎么使用android sdk 以及ndk”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注亿速云网站，小编将为大家输出更多高质量的实用文章！
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