Android中使用startActivity()启动Activity

Intent intent = new Intent(this, ArrayAdapterActivity.class);
                startActivity(intent);

Button arrayAdapter_btn =(Button)findViewById(R.id.arrayAdapter_Btn);
        arrayAdapter_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //启动ArrayAdapterActivity
                Intent intent = new Intent(UIActivity.this, ArrayAdapterActivity.class);
                startActivity(intent);
            }
        });