启动,关闭Activity的两种方法

1. startActivity(Intent intent): 启动其他Activity

　　对应关闭方法finish():结束当前Activity

public class MainActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 获取应用程序中的bn按钮
        Button bn = (Button) findViewById(R.id.bn);
        // 为bn按钮绑定事件监听器
        bn.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View source)
            {
                // 创建需要启动的Activity对应的Intent
                Intent intent = new Intent(MainActivity.this,
                        SecondActivity.class);
                // 启动intent对应的Activity
                startActivity(intent);
            }
        });
    }
}

2. startActivityForResult(Intent intent, int requestCode)

　　对应关闭方法: finishActivity(int requestCode) 结束以 startActivityForResult(Intent intent, int requestCode)方法启动的Activity