为什么getStringExtra没有给出正确的输出? [英] why getStringExtra doesn't give the proper output?

问题描述

我正在尝试将一些String从一种意图传递给另一种意图.但是adt说:

I'm was trying to pass some String from one intent to another. but adt says:

关键文本应为String，但值是android.text.SpannableString. 返回默认值.

Key text expected String but value was a android.text.SpannableString. The default value was returned.

但是我使用字符串作为键，而不是它声称的键！

but I'm using a String as key not what it claims!

这是我第一次活动的代码:

here's the code for my first activity:

private int CONTACTS_ACTIVITY_REQUEST = 1001;
public static final String TEXT_KEY = "text";
...

Intent intent = new Intent(this, ContactsActivity.class);
intent.putExtra(TEXT_KEY, text.getText());
startActivityForResult(intent, CONTACTS_ACTIVITY_REQUEST);

我的第二项活动:

Intent intent = this.getIntent();
text = intent.getStringExtra(MainActivity.TEXT_KEY);

谢谢.

p.s.这是完整的堆栈跟踪:

p.s. here's the full stack trace:

03-22 14:51:32.975: W/Bundle(1248): Key text expected String but value was a android.text.SpannableString.  The default value <null> was returned. 
03-22 14:51:33.006: W/Bundle(1248): Attempt to cast generated internal exception: 
03-22 14:51:33.006: W/Bundle(1248): java.lang.ClassCastException: android.text.SpannableString cannot be cast to java.lang.String 
03-22 14:51:33.006: W/Bundle(1248):     at android.os.Bundle.getString(Bundle.java:1085) 03-22 14:51:33.006: W/Bundle(1248):    at android.content.Intent.getStringExtra(Intent.java:4473) 
03-22 14:51:33.006: W/Bundle(1248):     at com.saeedFri.groupsms.ContactsActivity.onCreate(ContactsActivity.java:39) 
03-22 14:51:33.006: W/Bundle(1248):     at android.app.Activity.performCreate(Activity.java:5133) 
03-22 14:51:33.006: W/Bundle(1248):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
03-22 14:51:33.006: W/Bundle(1248):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 
03-22 14:51:33.006: W/Bundle(1248):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
03-22 14:51:33.006: W/Bundle(1248):     at android.app.ActivityThread.access$600(ActivityThread.java:141) 
03-22 14:51:33.006: W/Bundle(1248):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
03-22 14:51:33.006: W/Bundle(1248):     at android.os.Handler.dispatchMessage(Handler.java:99) 
03-22 14:51:33.006: W/Bundle(1248):     at android.os.Looper.loop(Looper.java:137) 
03-22 14:51:33.006: W/Bundle(1248):     at android.app.ActivityThread.main(ActivityThread.java:5103) 
03-22 14:51:33.006: W/Bundle(1248):     at java.lang.reflect.Method.invokeNative(Native Method) 
03-22 14:51:33.006: W/Bundle(1248):     at java.lang.reflect.Method.invoke(Method.java:525) 
03-22 14:51:33.006: W/Bundle(1248):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
03-22 14:51:33.006: W/Bundle(1248):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
03-22 14:51:33.006: W/Bundle(1248):     at dalvik.system.NativeStart.main(Native Method)

推荐答案

更改

intent.putExtra(TEXT_KEY, text.getText());

到

intent.putExtra(TEXT_KEY, text.getText().toString());

在第一个活动中，您需要发送值，getText方法返回Editable，因此，如果要获取值，则需要使用toString()方法.

in first activity you need send your value, getText method return Editable, so if you want value you need use toString() method.

您可以在第二堂课上解决这个问题

you can handle that on second class to with

text = intent.getStringExtra(MainActivity.TEXT_KEY).toString();

您需要使用以下两种方式之一

you need use one of this two way,

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