意图包返回Null每一次？

问题描述

我送到一个新的意图一些额外的。在那里，它抓住包，并测试它是否是空。每一次它是空即使我能得到传递的值，并利用它们。

有人能看到什么是错的if语句？

 意图I = getIntent（）;
叠B = i.getExtras（）;
INT挑= b.getInt（匹克）;
诠释正确= b.getInt（CORR）;
TYPE = b.getString（兰德）;
如果（二== NULL ||！b.containsKey（井））{
    Log.v（捆绑，包子为空）;
} 其他 {
    Log.v（捆绑，得到了包子很好）;
}
 

编辑：继承人在其中创建包

 意向意图=新的意图（这一点，app.pack.son.class）;
叠B =新包（）;
b.putInt（匹克，挑选）;
b.putInt（CORR，科尔）;
b.putString（RAND，是）;
intent.putExtras（B）;
startActivity（意向）;
 

解决方案

我不认为这个问题是你的包是空。它不可能是因为你会得到一个 NullPointerException异常更快。

现在的问题是，你的错误信息是错误的。更改此设置：

 如果（二== NULL ||！b.containsKey（井））{
    Log.v（捆绑，包子为空）;
} 其他 {
    // ...
}
 

要这样：

 如果（！b.containsKey（井））{
    Log.v（捆绑，包不包含关键WELL）;
} 其他 {
    // ...
}
 

和为什么包不包含这个关键的原因，是因为你没有添加它。

I have some extras sent to a new intent. There it grabs the bundle and tests if it is null. Every single time it is null even though I am able to get the values passed and use them.

Can anyone see what is wrong with the if statement?

Intent i = getIntent();
Bundle b = i.getExtras();
int picked = b.getInt("PICK");
int correct = b.getInt("CORR");
type = b.getString("RAND");
if(b == null || !b.containsKey("WELL")) {
    Log.v("BUNDLE", "bun is null");
} else {
    Log.v("BUNDLE", "Got bun well");
}

EDIT: Heres where the bundle is created.

Intent intent = new Intent(this, app.pack.son.class);
Bundle b = new Bundle();
b.putInt("PICK", pick);
b.putInt("CORR", corr);
b.putString("RAND", "yes");
intent.putExtras(b);
startActivity(intent);

解决方案

I don't think the problem is that your bundle is null. It can't be because you'd get a NullPointerException much sooner.

The problem is that your error message is wrong. Change this:

if(b == null || !b.containsKey("WELL")) {
    Log.v("BUNDLE", "bun is null");
} else {
    // ...
}

To this:

if (!b.containsKey("WELL")) {
    Log.v("BUNDLE", "bundle does not contain key WELL");
} else {
    // ...
}

And the reason why the bundle doesn't contain this key, is because you didn't add it.

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