Print the contents of a Bundle to Logcat?

Question

Is there an easy way to print the contents of a Bundle to Logcat if you can\'t remember the names of all the keys (even being able to print just the key names w

Answer 1

Solution in Kotlin:

fun Bundle.toPrintableString(): String {
    val sb = StringBuilder("{")
    var isFirst = true
    for (key in keySet()) {
        if (!isFirst)
            sb.append(',')
        else
            isFirst = false
        when (val value = get(key)) {
            is Bundle -> sb.append(key).append(':').append(value.toPrintableString())
            else -> sb.append(key).append(':').append(value)
            //TODO handle special cases if you wish
        }
    }
    sb.append('}')
    return sb.toString()
}

Sample:

    val bundle = Bundle()
    bundle.putString("asd", "qwe")
    bundle.putInt("zxc", 123)
    Log.d("AppLog", "bundle:${bundle.toPrintableString()}")

Note that it doesn't handle all possible types of values. You should decide which are important to show and in which way.

Answer 2

You can get more specific by printing the mapped value as follows:

for (String key : bundle.keySet())
{
    Log.d("Bundle Debug", key + " = \"" + bundle.get(key) + "\"");
}

Answer 3

Bundle#keySet() should work.

for (String key: bundle.keySet())
{
  Log.d ("myApplication", key + " is a key in the bundle");
}

And if you want to get the Object, you can use Bundle#get(String key)(which is also in the same documentation I linked at the top of my answer). However, keep in mind using the generic get() call:

• You're working with Object. If you're simply printing to a Log, toString() will be invoked and all will be fine. However, if you actually want to use the key's pair, you need to do instanceof checks to avoid calling the wrong method.
• Since toString will be invoked, if you have a special Object (eg ArrayLists, or special Serializable/Parcelable extras) you're most likely not going to get anything useful from the printout.

Answer 4

Java 8 stream one liner:

bundle.keySet().stream().forEach(k -> Log.d(TAG, k + " = " + bundle.get(k)));