java - java中类之间如何共享变量

Question

Possible Duplicate:
Passing data between activities in Android

所以我有两个 Activity ，我需要在第一个 Activity 中保存一个变量，并在第二个 Activity 中使用它。谁能帮我？谢谢!

Answer 1

使用这样的东西:

    Intent intent = new Intent(this, ClassImCalling.class);
    intent.putExtra("variable", myvariable);
    startActivityForResult(intent, int_identifier);

在另一个 Activity 中:

    intent = getIntent();
    var=intent.getStringExtra("variable");

返回调用它的 Activity ( Intent 与上面的 getIntent() 相同):

    setResult(RESULT_OK, intent);
    finish();

当您返回到第一个 Activity 时:

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == int_identifier) {
        if (resultCode == RESULT_OK) {
            Do suff
        }else if(resultCode == RESULT_CANCELED){
            Action was cancelled :(
        }
    }
}