Activity跳转时传递简单数据

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.btnStartAty).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(MainActivity.this, TheAty.class);
                i.putExtra("data", "hello android");//传递一个字符串参数，参数的name值为“data”，数值为“hello android
                startActivity(i);//启动另一个activity

            }
        });
    }

<TextView android:text="@string/hello_world" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv"/>

 private TextView tv;//首先添加一个TextView成员变量
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_the_aty);

        Intent i = getIntent();//获取相关的intent
        tv = (TextView)findViewById(R.id.tv);
        tv.setText(i.getStringExtra("data"));//设置文本框中的值
    }