java 如何将用户输入从 EditText 保存到要在不同活动上使用的变量
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How to save user input from EditText to a variable to be used on a different Activity
提问by sonic
I have an edit text in Android Studio which I want a user to enter a name which can then be stored as a variable. I then want to add this variable to a textview in my main activity.
我在 Android Studio 中有一个编辑文本，我希望用户输入一个名称，然后可以将其存储为变量。然后我想将此变量添加到我的主要活动中的 textview。
Right now all a have is a blank activity with an edit text and button to save the user input as a variable.
现在所有的都是一个带有编辑文本和按钮的空白活动，用于将用户输入保存为变量。
Edit
编辑
Ok, I am going to change my approach. In my main activity, I have two text views. If I changed them to edit texts, then how would I save them from the main activity without a save button so that what the user typed would still be there?
好的，我要改变我的方法。在我的主要活动中，我有两个文本视图。如果我将它们更改为编辑文本，那么如何在没有保存按钮的情况下将它们从主活动中保存，以便用户输入的内容仍然存在？
回答by Rick Sanchez
Save it in Shared Preferencesand then retrieve it from the other activity.
将其保存在共享首选项中，然后从其他活动中检索它。
To save a String in shared preferences, you can create a method like the following:
要在共享首选项中保存字符串，您可以创建一个如下所示的方法：
public static void setUsername(Context context, String username) {
SharedPreferences prefs = context.getSharedPreferences("myAppPackage", 0);
SharedPreferences.Editor editor = prefs.edit();
editor.putString("username", username);
editor.commit();
}
To retreive it :
检索它：
public static String getUsername(Context context) {
SharedPreferences prefs = context.getSharedPreferences("myAppPackage", 0);
return prefs.getString("username", "");
}
Edited:
In the activity which contains the EditText, you can call the method as follows:
setUsername(this,myEditText.getText().toString());
已编辑：
在包含 EditText 的活动中，您可以调用方法如下：
setUsername(this,myEditText.getText().toString());
And in the Activitiy that contains the TextView:
myTextView.setText( getUsername(this) );
在包含 TextView 的 Activitiy 中：
myTextView.setText( getUsername(this) );
回答by sonic
you ?a use edit.getText().toString()tout get the user input.
你?使用edit.getText().toString()tout获取用户输入。
To launch new activity and pass the string to it use
要启动新活动并将字符串传递给它，请使用
Intent intent = new Intent(this, OtherActivity.class);
intent.putExtra("key", theString);
startActivity(intent);
EDIT
编辑
To be more easy you should add a button to your layout so when the user press that button you can launch the next activity with the string. This should go into your activity
为了更简单，您应该在布局中添加一个按钮，以便当用户按下该按钮时，您可以使用字符串启动下一个活动。这应该进入您的活动
public class BlankActivity implements OnClickListener {
private EditText mEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
//find editText
mEditText = (EditText) findViewById(R.id.your_edit_text_id);
//listen button
findViewById(R.id.your_button_id).setOnClickListener(this);
}
@Override
public void onClick(View v) {
String theString = mEditText.getText().toString();
Intent intent = new Intent(this, OtherActivity.class);
intent.putExtra("key", theString);
startActivity(intent);
}
}
