应用源码之java调用C例子.zip

package com.duicky; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; /** * Java 调用 C 例子 * * @author luxiaofeng * */ public class MainActivity extends Activity { //也就是你mk配置文件中的 LOCAL_MODULE := NDK_03 private static final String libSoName = "NDK_03"; private static final String tag = "MainActivity"; private Context mContext = null; private Button btnClick = null; private String mStrMSG = null; private EditText etX = null; private EditText etY = null; private EditText etResult = null; private int x = 0 ; private int y = 0 ; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mContext = this; //初始化控件 initViews(); } /** * 初始化控件 */ private void initViews() { etX = (EditText)findViewById(R.id.et_x); etY = (EditText)findViewById(R.id.et_y); etResult = (EditText)findViewById(R.id.et_result); btnClick = (Button) findViewById(R.id.btn_click); btnClick.setOnClickListener(new OnClickListener() { public void onClick(View v) { if(getX() && getY()){ int result = add(x,y); LogUtils.printWithLogCat(tag,x+" + " + y + " = " +result); etResult.setText(String.valueOf(result)); } else { etX.setText(""); etY.setText(""); etResult.setText(""); LogUtils.toastMessage(mContext, "请输入正确的值"); } } }); } /** * 获取x */ private boolean getX() { String str = etX.getText().toString().trim(); try { x = Integer.valueOf(str); } catch(NumberFormatException e) { return false; } return true; } /** * 获取y */ private boolean getY() { String str = etY.getText().toString().trim(); try { y = Integer.valueOf(str); } catch(NumberFormatException e) { return false; } return true; } /** * 该方法为native方法. * * 实现加法功能 * * @param x 加数 * @param y 加数 * * @return x+y 的结果 */ public native int add(int x, int y); /** * 载入JNI生成的so库文件 */ static { System.loadLibrary(libSoName); } }