Android Studio 中生成JNI頭文件

package com.example.witness.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

    public native String getStringFromNative();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

在/home/witness/AndroidStudioProjects/MyApplication/app/src/main目錄執行：

javah -d jni -classpath /home/witness/AndroidStudioProjects/MyApplication/app/build/intermediates/classes/debug:/home/witness/Android/Sdk/platforms/android-17/android.jar com.example.witness.myapplication.MainActivity

（注意：-classpath後面的多個使用":"分隔）

執行後在main目錄下生成jni目錄，在jni目錄下生成頭文件