在 Android 中的 Activity 之间传递数据
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Passing data between activities in Android
提问by yokks
How do you pass data between activities in an Android application?
您如何在 Android 应用程序中的活动之间传递数据？
回答by Pentium10
in your current activity, create an intent
在您当前的活动中，创建一个意图
Intent i = new Intent(getApplicationContext(), ActivityB.class);
i.putExtra(key, value);
startActivity(i);
then in the other activity, retrieve those values.
然后在另一个活动中，检索这些值。
Bundle extras = getIntent().getExtras();
if(extras !=null) {
String value = extras.getString(key);
}
回答by Patricia Heimfarth
Use a global class:
使用全局类：
public class GlobalClass extends Application
{
private float vitamin_a;
public float getVitaminA() {
return vitamin_a;
}
public void setVitaminA(float vitamin_a) {
this.vitamin_a = vitamin_a;
}
}
You can call the setters and the getters of this class from all other classes. Do do that, you need to make a GlobalClass-Object in every Actitity:
您可以从所有其他类调用该类的 setter 和 getter。这样做，您需要在每个活动中创建一个 GlobalClass-Object：
GlobalClass gc = (GlobalClass) getApplication();
Then you can call for example:
然后你可以调用例如：
gc.getVitaminA()
回答by AlphaStack
Put this in your secondary activity
把它放在你的次要活动中
SharedPreferences preferences =getApplicationContext().getSharedPreferences("name", MainActivity.MODE_PRIVATE);
android.content.SharedPreferences.Editor editor = preferences.edit();
editor.putString("name", "Wally");
editor.commit();
Put this in your MainActivity
把它放在你的 MainActivity 中
SharedPreferences preferences = getApplicationContext().getSharedPreferences("name", MainActivity.MODE_PRIVATE);
if(preferences.contains("name")){
Toast.makeText(getApplicationContext(), preferences.getString("name", "null"), Toast.LENGTH_LONG).show();
}
