Question

我为我的最后一年项目创建触发器和动作应用程序，

我将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要活动，

我为Trigger子模块和Action子模块做了两件事，两者都是相同的编码......

触发模块工作正常，但当动作模块运行应用程序时强行停止

，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

儿童onActivityResult

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();
}

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;
        }
    }
}

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;
        }
    }
}

Answer 1

这意味着Intent接收方在其onActivityResult()中引发了异常。我可以在此处看到NullPointerException：data.equals(null)肯定是错误的，因为它会在data为null时抛出异常。你的意思是data == null。

Answer 2

只需检查null != data，数据等于null

将结果ResultInfo {who = null，request = 1，result = -1，data = Intent {（has extras）}}传递给活动失败;显示java.lang.NullPointerException

2 个答案: