Android(安卓)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：
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