Android 未能将结果 ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} 传递给活动；java.lang.NullPointerException
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Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity; java.lang.NullPointerException
提问by Mani
Im creating Triggers and Action Application for my Final Year Project,
我正在为我的最后一年项目创建触发器和操作应用程序，
I return a child Activity result to intermediate activity and ther add some data to that activity and send it again to main activity,
我将一个子活动结果返回到中间活动，然后向该活动添加一些数据并将其再次发送到主活动，
I did for both Trigger sub module and Action sub module, both like same coding....
我为 Trigger 子模块和 Action 子模块做了同样的编码......
trigger module is working perfectly, but when action module run application is force stopped
触发模块工作正常，但是当动作模块运行应用程序被强制停止时
and error is
错误是
E/AndroidRuntime(5104): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity {mani.droid.mechanize/mani.droid.mechanize.ActionListActivity}: java.lang.NullPointerException
Child onActivityResult
子活动结果
public void onSave(View v)
{
if(txtNum.length() != 0)
{
String strTmp = null;
Intent resultInt = new Intent();
strTmp = txtNum.getText().toString();
resultInt.putExtra("Num", strTmp);
resultInt.putExtra("SubName", strTmp);
setResult(Activity.RESULT_OK, resultInt);
finish();
}
else
Toast.makeText(getApplicationContext(), "Please enter number or choose from contact", Toast.LENGTH_SHORT).show();
}
Intermediate onActivityResult
中级 onActivityResult
//getting result from other activity and sending to action list activity
@Override
public void onActivityResult(int reqCode, int resultCode, Intent data) {
super.onActivityResult(reqCode, resultCode, data);
if(resultCode == Activity.RESULT_OK)
{
switch(reqCode)
{
case 1:
data.putExtra("ActionName", txtAction);
setResult(Activity.RESULT_OK, data);
finish();
break;
}
}
}
Main onActivityResult
主要 onActivityResult
//Getting Trigger parameters and adding to list
@Override
public void onActivityResult(int reqCode, int resultCode, Intent data) {
super.onActivityResult(reqCode, resultCode, data);
if(resultCode == Activity.RESULT_OK)
{
switch(reqCode)
{
case 1:
if (data.equals(null))
{
Toast.makeText(context, "Intent is Null", Toast.LENGTH_SHORT).show();
}
else
{
//String actName = data.getStringExtra("ActionName");
String subName = data.getStringExtra("SubName");
Toast.makeText(context, subName, Toast.LENGTH_SHORT).show();
}
break;
}
}
}
回答by Sean Owen
It means the Intentreceiver threw an exception in its onActivityResult(). And I can see the NullPointerExceptionright here: data.equals(null)is definitely wrong as it throws an exception when datais null. You mean data == null.
这意味着Intent接收器在其onActivityResult(). 我可以在NullPointerException这里看到正确的：data.equals(null)绝对是错误的，因为它在datais时抛出异常null。你的意思是data == null。
回答by Mina Fawzy
just check null != data, as data equal null
只需检查null != data，因为数据等于空
