Android:在类之间传递参数 [英] Android: passing parameters between classes

问题描述

我有一个 class2，它在点击时由 class1 参与.我必须将一些参数/对象从 class1 传递到 class2.我只知道没有参数传递选项的标准方式.

I have a class2 which is involved by class1 when clicks are made. I have to pass some parameters/objects from class1 to class2. I only know the standard way which does not have an option of passing parameters.

// launch the full article
Intent i = new Intent(this, Class2.class);

startActivity(i);

推荐答案

您可以使用 Intent.putExtra(使用 Bundle)来传递额外的数据.>

You can use Intent.putExtra (Which uses a Bundle) to pass extra data.

Intent i = new Intent(this, Class2.class);
i.putExtra("foo", 5.0f);
i.putExtra("bar", "baz");
startActivity(i);

然后，一旦您进入新的Activity:

Then once you're inside your new Activity:

Bundle extras = getIntent().getExtras(); 
if(extras !=null)
{
 float foo = extras.getFloat("foo");
 String bar = extras.getString("bar");
}

这允许您将基本数据传递给活动.但是，您可能需要做更多的工作来传递任意对象.

This allows you to pass basic data to Activities. However, you may need a bit more work for passing arbitrary objects along.

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