Android Question Vu meter and Visualizer-WavForm


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Hello ,

Some friends of mine asked me to make a voice recorder with a wavform and a vu meter analog.

Taking as examples the tutorials Vumeter and Visualizer-WavForm , i tried to do it but vumeter example in compiling has an erron " java.lang.NullPointerException ".

Can you tell me what can i do . If is not possible can you tell me if i use Gauges Example , how can i pass each wav data to the gauge.ChangeValue(Value) , so each value in wavform is syncrhronized with vu meter ?

Many thanks and best wishes for Christmas !!!!!!!!!!!!!!!!!!!!!!!!!