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ScalaでAndroidアプリ作成時、AsyncTaskの可変長引数メソッドが使えないことへの対策とサンプル
package jp.ponko2.android.os;
import android.os.AsyncTask;
public abstract class AsyncTask1<Params, Progress, Result> extends AsyncTask<Params, Progress, Result> {
@Override
protected Result doInBackground(Params... params) {
return doInBackground(params.length > 0 ? params[0] : null);
}
abstract protected Result doInBackground(Params param);
@Override
protected void onProgressUpdate(Progress... values) {
onProgressUpdate(values.length > 0 ? values[0] : null);
}
protected void onProgressUpdate(Progress value) {
}
@SuppressWarnings({"unchecked"})
protected final void publishProgress(Progress value) {
super.publishProgress(value);
}
}
package jp.ponko2.android.sample
import _root_.android.app.Activity
import _root_.android.os.Bundle
import _root_.android.os.AsyncTask.Status
import _root_.android.widget.{TextView, Toast}
import _root_.android.view.Window
import jp.ponko2.android.os.AsyncTask1
class SampleActivity extends Activity {
private lazy val mTask = new TestTask
override def onCreate(savedInstanceState: Bundle) {
super.onCreate(savedInstanceState)
val values = Seq(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
setupProgress()
setContentView(new TextView(this) {
setText(values.mkString(" + ") + " = ")
})
mTask.execute(values)
}
override protected def onDestroy() {
super.onDestroy()
if (mTask.getStatus == Status.RUNNING) {
mTask cancel true
}
}
private def setupProgress() {
requestWindowFeature(Window.FEATURE_PROGRESS)
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS)
}
private class TestTask extends AsyncTask1[Seq[Int], Int, Int] {
override protected def onPreExecute() = showProgress()
override protected def doInBackground(values: Seq[Int]): Int = {
val count = values.length
var total = 0
for (i <- 0 until count) {
publishProgress(((i / count.toFloat) * 10000).toInt)
Thread.sleep(500)
total += values(i)
}
total
}
override protected def onProgressUpdate(progress: Int) {
setProgress(progress)
}
override protected def onPostExecute(result: Int) {
hideProgress()
Toast.makeText(SampleActivity.this, result.toString, Toast.LENGTH_LONG).show()
}
private def showProgress() = {
setProgressBarVisibility(true)
setProgressBarIndeterminateVisibility(true)
}
private def hideProgress() = {
setProgressBarVisibility(false)
setProgressBarIndeterminateVisibility(false)
}
}
}
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