aaaa.java

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //取得此Button的實體
        button = (Button)findViewById(R.id.button);

        //實做OnClickListener界面
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startNextPage();
            }
        });
    }
    
    /**
     * 開啟Main2Activity之用
     * 
     */
    private void startNextPage(){
        Intent intent = new Intent();
        intent.setClass(this , Main2Activity.class);
        startActivity(intent);
    }