Android activity跳转方式

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btnInsert = (Button) this.findViewById(R.id.btnInsert);    //获取btn
        btnInsert.setOnClickListener(new View.OnClickListener() {    //添加监听器
            @Override
            public void onClick(View v) {
                setContentView(R.layout.activity_insert);        //跳转
            }
        });
    }

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btnInsert = (Button) this.findViewById(R.id.btnInsert);    //获取按钮
        btnInsert.setOnClickListener(new View.OnClickListener() {    //添加监听器
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setClass(MainActivity.this, InsertActivity.class);    //设置Intent属性
                MainActivity.this.startActivity(intent);    //跳转
            }
        });
    }