Listing all extras of an Intent

Question

Here's what I used to get information on an undocumented (3rd-party) intent:

Bundle bundle = intent.getExtras();
if (bundle != null) {
    for (String key : bundle.keySet()) {
        Log.e(TAG, key + " : " + (bundle.get(key) != null ? bundle.get(key) : "NULL"));
    }
}

Make sure to check if bundle is null before the loop.

This is how I define utility method to dump all extras of an Intent.

import java.util.Iterator;
import java.util.Set;
import android.os.Bundle;


public static void dumpIntent(Intent i){

    Bundle bundle = i.getExtras();
    if (bundle != null) {
        Set<String> keys = bundle.keySet();
        Iterator<String> it = keys.iterator();
        Log.e(LOG_TAG,"Dumping Intent start");
        while (it.hasNext()) {
            String key = it.next();
            Log.e(LOG_TAG,"[" + key + "=" + bundle.get(key)+"]");
        }
        Log.e(LOG_TAG,"Dumping Intent end");
    }
}

You can do it in one line of code:

Log.d("intent URI", intent.toUri(0));

It outputs something like:

"#Intent;action=android.intent.action.MAIN;category=android.intent.category.LAUNCHER;launchFlags=0x10a00000;component=com.mydomain.myapp/.StartActivity;sourceBounds=12%20870%20276%201167; l.profile=0; end"

At the end of this string (the part that I bolded) you can find the list of extras (only one extra in this example).

This is according to the toUri documentation: "The URI contains the Intent's data as the base URI, with an additional fragment describing the action, categories, type, flags, package, component, and extras."

private TextView tv;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    tv = new TextView(this);
    tv.setText("Extras: \n\r");

    setContentView(tv);

    StringBuilder str = new StringBuilder();
    Bundle bundle = getIntent().getExtras();
    if (bundle != null) {
        Set<String> keys = bundle.keySet();
        Iterator<String> it = keys.iterator();
        while (it.hasNext()) {
            String key = it.next();
            str.append(key);
            str.append(":");
            str.append(bundle.get(key));
            str.append("\n\r");
        }
        tv.setText(str.toString());
    }
}

The get(String key) method of Bundle returns an Object. Your best bet is to spin over the key set calling get(String) on each key and using toString() on the Object to output them. This will work best for primitives, but you may run into issues with Objects that do not implement a toString().

I wanted a way to output the contents of an intent to the log, and to be able to read it easily, so here's what I came up with. I've created a LogUtil class, and then took the dumpIntent() method @Pratik created, and modified it a bit. Here's what it all looks like:

public class LogUtil {

    private static final String TAG = "IntentDump";

    public static void dumpIntent(Intent i){
        Bundle bundle = i.getExtras();
        if (bundle != null) {
            Set<String> keys = bundle.keySet();

            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append("IntentDump \n\r");
            stringBuilder.append("-------------------------------------------------------------\n\r");

            for (String key : keys) {
                stringBuilder.append(key).append("=").append(bundle.get(key)).append("\n\r");
            }

            stringBuilder.append("-------------------------------------------------------------\n\r");
            Log.i(TAG, stringBuilder.toString());
        }
    }
}

Hope this helps someone!