Android: Application is running slow after it's been migrated from old adt-bundle to latest android studio

Question

Its been a year I was inactive with android development. Earlier I used to develop apps using adt-bundle eclipse. Recently I started working with Android studio. I have migrated my application code by creating new files in android studio project and copied code, also made some changes in manifest and newly introduced build.gradle files.

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First I got error, java.lang.OutOfMemoryError

So I've added following in manifest file, android:largeHeap="true"

This problem is resolved then.

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Later I removed inherited class ActionBarActivity from activity classes, and inherited AppCompatActivity .
Also added following in bundle.gradle

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.google.android.gms:play-services-ads:8.3.0'
}

now I'm getting following errors,

I/Choreographer: Skipped 158 frames!  The application may be doing too much work on its main thread.
E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length

Is the problem arising due to following use of findViewByID

(EditText) findViewById(R.id.editText1);
(EditText) findViewById(R.id.editText2);
(EditText) findViewById(R.id.editText3);
(Spinner) findViewById(R.id.spinner1);
(EditText) findViewById(R.id.editText4);

The main problem is, app is running very slow!!!

Answer 1

Not sure if you are having the same issue as mine. Mine was because my app has a configuration in AndroidManifest that says android:hardwareAccelerated="false"

This doesn't cause any lag issue in the old UI, but I am thinking that maybe with the new material design UI effects it introduces some lag unless we use hardware acceleration.

Try removing android:hardwareAccelerated="false" or set it to true to see if it still lags when responding to your touches. It solves mine.