如何使用意图将hashmap值发送到其他活动 [英] How to send hashmap value to another activity using an intent
问题描述
如何将 HashMap
值从一个Intent发送到第二个Intent?
另外,如何在第二个Activity中检索 HashMap
值?
< Java的HashMap类扩展了
Serializable
接口,这可以很容易地将它添加到一个intent中,使用 意图.putExtra(String,Serializable)
方法。 在接收意图的活动/服务/请拨打
Intent.getSerializableExtra (字符串)
与您使用putExtra的名称。
例如,发送intent时:
HashMap< String,String> hashMap = new HashMap< String,String>();
hashMap.put(key,value);
Intent intent = new Intent(this,MyOtherActivity.class);
intent.putExtra(map,hashMap);
startActivity(intent);
然后在接收Activity中:
protected void onCreate(Bundle bundle){
super.onCreate(savedInstanceState);
Intent intent = getIntent();
HashMap< String,String> hashMap =(HashMap< String,String>)intent.getSerializableExtra(map);
Log.v(HashMapTest,hashMap.get(key));
}
How to send HashMap
value from one Intent to second Intent?
Also, how to retrieve that HashMap
value in the second Activity?
Java's HashMap class extends the Serializable
interface, which makes it easy to add it to an intent, using the Intent.putExtra(String, Serializable)
method.
In the activity/service/broadcast receiver that receives the intent, you then call
Intent.getSerializableExtra(String)
with the name that you used with putExtra.
For example, when sending the intent:
HashMap<String, String> hashMap = new HashMap<String, String>();
hashMap.put("key", "value");
Intent intent = new Intent(this, MyOtherActivity.class);
intent.putExtra("map", hashMap);
startActivity(intent);
And then in the receiving Activity:
protected void onCreate(Bundle bundle) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
HashMap<String, String> hashMap = (HashMap<String, String>)intent.getSerializableExtra("map");
Log.v("HashMapTest", hashMap.get("key"));
}
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