我有2个问题,阅读NFC标签。
首先是标签读取活动创建时接收到的标签各一次。
和第二个问题是活动在全屏幕窗口中打开,而不是在选项卡主机活动,但第一个问题是最糟糕的。
我该怎么办(AndroidManifest.xml中):
<活动
机器人:名称=readingActivity>
<意向滤光器>
<作用机器人:名称=android.nfc.action.TAG_DISCOVERED/>
<类机器人:名称=android.intent.category.DEFAULT/>
&所述; /意图滤光器>
< /活性GT;
和readingActivity.cs:
@覆盖
公共无效的onCreate(包savedInstanceState){
Log.d(W,的onCreate);
super.onCreate(savedInstanceState);
的setContentView(R.layout.readingActivity);
}
@覆盖
公共无效onResume(){
super.onResume();
Log.d(W,onResume);
PendingIntent意图= PendingIntent.getActivity(此,0,getIntent(),0);
NfcAdapter.getDefaultAdapter(本).enableForegroundDispatch(这一点,意图,
NULL,NULL);
}
@覆盖
保护无效的onPause(){
super.onPause();
如果(NfcAdapter.getDefaultAdapter(这一点)!= NULL)
NfcAdapter.getDefaultAdapter(本).disableForegroundDispatch(本);
}
![Android中读取NFC标签卡中的ID](/d/file/2023/09-17/a42d91c8ef0ccea3434dccbd15e44a2c.png)
日志:
02-28 18:22:19.949:D / W(4513):的onCreate
02-28 18:22:19.949:D / W(4513):onResume
02-28 18:22:21.078:D / W(4513):的onCreate
02-28 18:22:21.082:D / W(4513):onResume
解决方案
现在的问题是,在 PendingIntent
。该 getIntent()
检索意图
的开始你的活动
,所以它传递给 PendingIntent
将导致启动它另一个时间。
而不是 getIntent()
使用类似新意图(this.getApplicationContext(),this.getClass())。
I have 2 issues with reading NFC Tags.
First is Tag Read Activity creates each time when tag received.
And second issue is activity opens in full screen window, not under Tab Host Activity, but first issue is worst.
What do I do ( AndroidManifest.xml ):
<activity
android:name="readingActivity" >
<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
and readingActivity.cs:
@Override
public void onCreate(Bundle savedInstanceState) {
Log.d("W", "onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.readingActivity);
}
@Override
public void onResume() {
super.onResume();
Log.d("W", "onResume");
PendingIntent intent = PendingIntent.getActivity(this, 0, getIntent(), 0);
NfcAdapter.getDefaultAdapter(this).enableForegroundDispatch(this, intent,
null, null);
}
@Override
protected void onPause() {
super.onPause();
if(NfcAdapter.getDefaultAdapter(this) != null)
NfcAdapter.getDefaultAdapter(this).disableForegroundDispatch(this);
}
Logs:
02-28 18:22:19.949: D/W(4513): onCreate
02-28 18:22:19.949: D/W(4513): onResume
02-28 18:22:21.078: D/W(4513): onCreate
02-28 18:22:21.082: D/W(4513): onResume
解决方案
The problem is in the PendingIntent
. The getIntent()
retrieves the Intent
that started your Activity
, so passing it to the PendingIntent
will result in starting it another time.
Instead of getIntent()
use something like new Intent(this.getApplicationContext(), this.getClass())
.
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