gistfile1.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) {
                //初始化Intent物件
                Intent intent = new Intent();
                //從MainActivity 到Main2Activity
                intent.setClass(MainActivity.this , Main2Activity.class);
                //開啟Activity
                startActivity(intent);
            }
        });
    }