为什么getStringExtra没有给出正确的输出？

Question

我正试图将一些String从一个意图传递到另一个意图.但是adt说:

关键文本期望String但值是android.text.SpannableString.返回了默认值.

但是我使用String作为关键而不是它声称的!

这是我第一次活动的代码:

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.

ps这里是完整的堆栈跟踪:

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)

Answer 1

更改

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

至

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

在第一个活动中你需要发送你的值,getText方法返回Editable,所以如果你想要值,你需要使用toString()方法.

你可以在第二课上处理

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

你需要使用这两种方式之一,