Android NDK学习（5）调用.so文件

直接贴代码了：

package com.YCan.testjni;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

    private Button btnAdd;
    private Button btnSub;
    private EditText num1;
    private EditText num2;
    private EditText result;
    private int a,b,rlt;
    
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        btnAdd = (Button)findViewById(R.id.button_add);
        btnSub = (Button)findViewById(R.id.button_sub);
        num1 = (EditText)findViewById(R.id.num1);
        num2 = (EditText)findViewById(R.id.num2);
        result = (EditText)findViewById(R.id.num3);
        
        btnAdd.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String strnum1 = num1.getText().toString();
                a = Integer.parseInt(strnum1);
                String strnum2 = num2.getText().toString();
                b = Integer.parseInt(strnum2);
                //rlt = a+b;
                rlt = add(a,b);
                Dostop(rlt);
            }
            
        });
        
        btnSub.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String strnum1 = num1.getText().toString();
                a = Integer.parseInt(strnum1);
                String strnum2 = num2.getText().toString();
                b = Integer.parseInt(strnum2);
                //rlt = a+b;
                rlt = sub(a,b);
                Dostop(rlt);
                
            }
        }
        );
    }
    
    
    public native int add (int a, int b);
    public native int sub (int a, int b);
    static {        
        System.loadLibrary("test-jni");    
    }
    private void Dostop(int number){
        Toast.makeText(this, ""+number, 8).show();//显示8秒
        String x=Integer.toString(rlt);    
        result.setText(x);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

运行效果：

加法：

减法：