将本机C文件作为库添加到Android项目
我要创建一个Android应用程序,它可以执行加法、减法、乘法、除法等算术功能 我知道这是一个简单的应用程序,但为了使它有点复杂,我用C编写了它,它被称为“arithmetricoperations.C” 现在,我想将这个.c文件作为库包含到我的Android项目中 我试过:将本机C文件作为库添加到Android项目,android,android-ndk,shared-libraries,native-code,android-library,Android,Android Ndk,Shared Libraries,Native Code,Android Library,我要创建一个Android应用程序,它可以执行加法、减法、乘法、除法等算术功能 我知道这是一个简单的应用程序,但为了使它有点复杂,我用C编写了它,它被称为“arithmetricoperations.C” 现在,我想将这个.c文件作为库包含到我的Android项目中 我试过: 使用androidndk,它可以工作,但我必须向用户提供代码 我分别使用Android NDK创建了一个.so文件,并将其包含在测试应用程序的libs/armeabi文件夹中;并显示不满意链接错误异常 使用androidn
int add(int x, int y)
{
return x+y;
}
int sub(int x, int y)
{
return x-y;
}
int mul(int x, int y)
{
return x*y;
}
int div(int x, int y)
{
return x/y;
}
**second.c**
#include "first.h"
#include <jni.h>
jint
Java_bri_ndk_sample_ArithmeticOperations_add( JNIEnv* env,
jobject this,
jint x,
jint y )
{
return add(x, y);
}
jint
Java_bri_ndk_sample_ArithmeticOperations_sub( JNIEnv* env,
jobject this,
jint x,
jint y )
{
return sub(x, y);
}
jint
Java_bri_ndk_sample_ArithmeticOperations_mul( JNIEnv* env,
jobject this,
jint x,
jint y )
{
return mul(x, y);
}
jint
Java_bri_ndk_sample_ArithmeticOperations_div( JNIEnv* env,
jobject this,
jint x,
jint y )
{
return div(x, y);
}
Android活动
package bri.sample;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class SampleTestActivity extends Activity {
/** Called when the activity is first created. */
static{
try{
System.loadLibrary("twolib-second");
}catch (Exception e){
e.printStackTrace();
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText xVal = (EditText)findViewById(R.id.editText1);
final EditText yVal = (EditText)findViewById(R.id.editText2);
final TextView result = (TextView)findViewById(R.id.textView1);
//final Arithmetic al = new Arithmetic();
Button b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int x = Integer.parseInt(xVal.getText().toString());
int y = Integer.parseInt(yVal.getText().toString());
Integer z = add(x, y);
result.setText(z.toString());
}
});
Button sub = (Button) findViewById(R.id.button2);
sub.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int x = Integer.parseInt(xVal.getText().toString());
int y = Integer.parseInt(yVal.getText().toString());
Integer z = sub(x, y);
result.setText(z.toString());
}
});
Button mul = (Button) findViewById(R.id.button3);
mul.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int x = Integer.parseInt(xVal.getText().toString());
int y = Integer.parseInt(yVal.getText().toString());
Integer z = mul(x, y);
result.setText(z.toString());
}
});
Button div = (Button) findViewById(R.id.button4);
div.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int x = Integer.parseInt(xVal.getText().toString());
int y = Integer.parseInt(yVal.getText().toString());
Integer z = div(x, y);
result.setText(z.toString());
}
});
}
public native int add(int x, int y);
public native int sub(int x, int y);
public native int mul(int x, int y);
public native int div(int x, int y);
}
现在我想要这个C文件作为Android的库
这也可以看作是
验证.so文件是否真的在.apk文件中(这是一个zip文件),并验证您正在使用正确的名称调用loadLibrary。您是否尝试过查看Android NDK附带的示例/hello jni示例?@MārtiņšMožeiko,+1用于提及示例,它们非常有用…@MārtiņšMo eiko我已经尝试过提及的示例。成功了。问题是我想分发我的图书馆,而不是我的资料来源。NDk要求源代码被分发。我在问题中添加了更多的代码,请参考任何试图回答这个问题的人,当OP指的是“用户”时,OP并不意味着“用户”。OP的意思是“开发者”。你是如何构建.so文件的??是通过安卓NDK。我对jni不太了解。如果你推荐一个好的示例应用程序会更好。NDK中samples目录下的hello-jni示例是非常好的起点。看一看。还可以阅读docs目录下的NDK文档。
package bri.sample;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class SampleTestActivity extends Activity {
/** Called when the activity is first created. */
static{
try{
System.loadLibrary("twolib-second");
}catch (Exception e){
e.printStackTrace();
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText xVal = (EditText)findViewById(R.id.editText1);
final EditText yVal = (EditText)findViewById(R.id.editText2);
final TextView result = (TextView)findViewById(R.id.textView1);
//final Arithmetic al = new Arithmetic();
Button b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int x = Integer.parseInt(xVal.getText().toString());
int y = Integer.parseInt(yVal.getText().toString());
Integer z = add(x, y);
result.setText(z.toString());
}
});
Button sub = (Button) findViewById(R.id.button2);
sub.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int x = Integer.parseInt(xVal.getText().toString());
int y = Integer.parseInt(yVal.getText().toString());
Integer z = sub(x, y);
result.setText(z.toString());
}
});
Button mul = (Button) findViewById(R.id.button3);
mul.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int x = Integer.parseInt(xVal.getText().toString());
int y = Integer.parseInt(yVal.getText().toString());
Integer z = mul(x, y);
result.setText(z.toString());
}
});
Button div = (Button) findViewById(R.id.button4);
div.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int x = Integer.parseInt(xVal.getText().toString());
int y = Integer.parseInt(yVal.getText().toString());
Integer z = div(x, y);
result.setText(z.toString());
}
});
}
public native int add(int x, int y);
public native int sub(int x, int y);
public native int mul(int x, int y);
public native int div(int x, int y);
}