android jni使用static变量

package com.boao; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class JniCallStaticFieldActivity extends Activity { /** Called when the activity is first created. */ TextView textView; public static final String libName = "JniCallStaticField"; int shu; Person person; StringBuffer buffer; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); textView = (TextView) findViewById(R.id.text); buffer = new StringBuffer(); person.age=10; buffer.append("最初的年龄是"+person.age); SetAge(); buffer.append("修改后的年龄是"+person.age); textView.setText(buffer.toString()); } public native void SetAge(); static { System.loadLibrary(libName); } }