Android Open Source - RZAndroidBaseUtils Async Drawable Example Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.raizlabs.baseutils.examples.asyncdrawable;
// w  w  w.  j a v a  2  s  .  c  om
import android.app.Activity;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;

import com.raizlabs.baseutils.examples.R;
import com.raizlabs.graphics.drawable.async.AsyncDrawableTask;
import com.raizlabs.graphics.drawable.async.AsyncDrawableUtils;
import com.raizlabs.graphics.drawable.async.BaseAsyncDrawableTask;

public class AsyncDrawableExampleActivity extends Activity {
  ImageView img1, img2, img3, img4;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_asyncdrawable);
    
    img1 = (ImageView) findViewById(R.id.img1);
    img2 = (ImageView) findViewById(R.id.img2);
    img3 = (ImageView) findViewById(R.id.img3);
    img4 = (ImageView) findViewById(R.id.img4);
    
    img1.setOnClickListener(imageViewClickListener);
    img2.setOnClickListener(imageViewClickListener);
    img3.setOnClickListener(imageViewClickListener);
    img4.setOnClickListener(imageViewClickListener);
    
    findViewById(R.id.asyncdrawable_load).setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        load();
      }
    });
    
    findViewById(R.id.asyncdrawable_reset).setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        reset();
      }
    });
  }
  
  private OnClickListener imageViewClickListener = new OnClickListener() {
    @Override
    public void onClick(View v) {
      // On click, try to grab the async drawable and cancel it
      if (v instanceof ImageView) {
        AsyncDrawableTask<?> task = AsyncDrawableUtils.getTask((ImageView)v);
        if (task != null) {
          task.cancel();
        }
      }
    }
  };

  private void reset() {
    // Load a standard drawable into each image
    Drawable defaultDrawable = new ColorDrawable(Color.WHITE);
    img1.setImageDrawable(defaultDrawable);
    img2.setImageDrawable(defaultDrawable);
    img3.setImageDrawable(defaultDrawable);
    img4.setImageDrawable(defaultDrawable);
  }
  
  private void load() {
    // For each view, bind a new DelayedDrawable
    final AsyncDrawableTask<?> draw1 = new DelayedDrawable(img1, R.drawable.ic_launcher, 2000);
    draw1.bind();
    final AsyncDrawableTask<?> draw2 = new DelayedDrawable(img2, R.drawable.ic_launcher, 3000);
    draw2.bind();
    final AsyncDrawableTask<?> draw3 = new DelayedDrawable(img3, R.drawable.ic_launcher, 4000);
    draw3.bind();
    final AsyncDrawableTask<?> draw4 = new DelayedDrawable(img4, R.drawable.ic_launcher, 5000);
    draw4.bind();

    // Execute each one on a new thread
    new Thread(new Runnable() {
      @Override
      public void run() {  
        draw1.execute();
      }
    }).start();
    new Thread(new Runnable() {
      @Override
      public void run() {  
        draw2.execute();
      }
    }).start();
    new Thread(new Runnable() {
      @Override
      public void run() {  
        draw3.execute();
      }
    }).start();
    new Thread(new Runnable() {
      @Override
      public void run() {  
        draw4.execute();
      }
    }).start();
  }
  
  /**
   * Implementation of an {@link AsyncDrawableTask} which just pauses for a given
   * period of time to simulate work and then loads a given image resource
   */
  private static class DelayedDrawable extends BaseAsyncDrawableTask<Integer> {
    private int resID;
    private long delay;

    public DelayedDrawable(ImageView view, int resourceID, long delayMillis) {
      super(view);
      resID = resourceID;
      delay = delayMillis;
    }

    @Override
    public Integer getKey() {
      // Use the resource ID as our key
      return resID;
    }

    @Override
    protected Drawable onBind() { 
      return null;
    }

    @Override
    protected Drawable doExecute() {
      // Sleep to simulate work
      try {
        Thread.sleep(delay);
      } catch (InterruptedException e) { }
      Log.d(getClass().getName(), "Sleep complete");
      // Use the view to gain access to the resources.
      // If it's null, we won't be setting any drawable anyway
      View view = getView();
      if (view != null) {
        Log.d(getClass().getName(), "View non-null");
        return view.getResources().getDrawable(resID);
      }
      return null;
    }

    @Override
    protected Drawable getLoadingDrawable() {
      // Use BLUE to represent loading
      return new ColorDrawable(Color.BLUE);
    }

    @Override
    protected Drawable getCancelledDrawable() {
      // Use RED to represent cancelled
      return new ColorDrawable(Color.RED);
    }

    @Override
    protected void onCancel() { }

  }
}

Java Source Code List

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