package course.examples.Threading.ThreadingHandlerMessages;
import java.lang.ref.WeakReference;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;
public class HandlerMessagesActivity extends Activity {
private final static int SET_PROGRESS_BAR_VISIBILITY = 0;
private final static int PROGRESS_UPDATE = 1;
private final static int SET_BITMAP = 2;
private ImageView mImageView;
private ProgressBar mProgressBar;
private int mDelay = 500;
static class UIHandler extends Handler {
WeakReference<HandlerMessagesActivity> mParent;
public UIHandler(WeakReference<HandlerMessagesActivity> parent) {
mParent = parent;
}
@Override
public void handleMessage(Message msg) {
HandlerMessagesActivity parent = mParent.get();
if (null != parent) {
switch (msg.what) {
case SET_PROGRESS_BAR_VISIBILITY: {
parent.getProgressBar().setVisibility((Integer) msg.obj);
break;
}
case PROGRESS_UPDATE: {
parent.getProgressBar().setProgress((Integer) msg.obj);
break;
}
case SET_BITMAP: {
parent.getImageView().setImageBitmap((Bitmap) msg.obj);
break;
}
}
}
}
}
Handler handler = new UIHandler(new WeakReference<HandlerMessagesActivity>(
this));
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mImageView = (ImageView) findViewById(R.id.imageView);
mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
final Button button = (Button) findViewById(R.id.loadButton);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
new Thread(new LoadIconTask(R.drawable.painter, handler))
.start();
}
});
final Button otherButton = (Button) findViewById(R.id.otherButton);
otherButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(HandlerMessagesActivity.this, "I'm Working",
Toast.LENGTH_SHORT).show();
}
});
}
private class LoadIconTask implements Runnable {
private final int resId;
private final Handler handler;
LoadIconTask(int resId, Handler handler) {
this.resId = resId;
this.handler = handler;
}
public void run() {
Message msg = handler.obtainMessage(SET_PROGRESS_BAR_VISIBILITY,
ProgressBar.VISIBLE);
handler.sendMessage(msg);
final Bitmap tmp = BitmapFactory.decodeResource(getResources(),
resId);
for (int i = 1; i < 11; i++) {
sleep();
msg = handler.obtainMessage(PROGRESS_UPDATE, i * 10);
handler.sendMessage(msg);
}
msg = handler.obtainMessage(SET_BITMAP, tmp);
handler.sendMessage(msg);
msg = handler.obtainMessage(SET_PROGRESS_BAR_VISIBILITY,
ProgressBar.INVISIBLE);
handler.sendMessage(msg);
}
private void sleep() {
try {
Thread.sleep(mDelay);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public ImageView getImageView() {
return mImageView;
}
public ProgressBar getProgressBar() {
return mProgressBar;
}
}