android - 如何处理 Activity android

Question

我从 Activity A 打开 Activity B，然后从 Activity B 打开 Activity C。现在从 Activity C 单击返回，它应该打开 Activity B，如果我在 Activity C 中按确定，它应该返回到 Activity A。

public class ActivityA extends ActionBarActivity  
{  
    public void onCreate(Bundle savedInstanceState)
    {
    ....
    }

public void onClick(View v)
{
    Intent intent = new Intent(this, ActivityB.class);

    startActivityForResult(intent,100);
}

protected void onActivityResult(int requestCode, int resultCode, Intent data)

{

    super.onActivityResult(requestCode, resultCode, data);


    if(resultCode != RESULT_OK)

    {

        return;

    }


    if(requestCode == 100)
    {
        String val=data.getStringExtra(“result_str”);
        ....

    }
}
}

public class ActivityB extends ActionBarActivity
{
public void onCreate(Bundle savedInstanceState)

{
    ....
}

public void onClick(View v)
{
    Intent intent = new Intent(this, ActivityC.class);

    startActivityForResult(intent,100);
}

protected void onActivityResult(int requestCode, int resultCode, Intent data)

{

    super.onActivityResult(requestCode, resultCode, data);


    if(resultCode != RESULT_OK)

    {

        return;

    }


    if(requestCode == 100)
    {
        Intent intent = new Intent();

        intent.putExtra(“result_str”,data.getStringExtra(“result_str”));
        intent.putExtra("val",val);

        setResult(RESULT_OK, intent);

        finish();
    }
}
}

public class ActivityC extends ActionBarActivity
{
public void onCreate(Bundle savedInstanceState)

{
    ....
}

public void onClick(View v)
{
    ....
    Intent intent = new Intent();

    intent.putExtra(“result_str”,result)

    setResult(RESULT_OK, intent);

    finish();
    }
 }

在这种情况下，我可以看到两个 Activity 消失了。我不想看到这两个 Activity 都在视觉上完成。如何实现？

Answer 1

1. 如果您在 Acitivity c 中按下后退按钮，刚刚完成 Activity c，它就会转到 Activity B。
2. 如果您按下确定按钮，将 FLAG_ACTIVITY_CLEAR_TOP 设置为 Intent 并开始 Activity a 并完成 Activity c。它完成 Activity c 和 Activity B，然后转到 Activity A。