Use new pause/resume support in sample app

Author: lucasr

picasso-sample/src/main/java/com/example/picasso/PicassoSampleActivity.java

@@ -10,6 +10,8 @@
 import android.widget.ListView;
 import android.widget.ToggleButton;
 
+import com.squareup.picasso.Picasso;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 
@@ -40,6 +42,12 @@ public void onItemClick(AdapterView<?> adapterView, View view, int position, lon
     });
   }
 
+  @Override
+  protected void onDestroy() {
+    super.onDestroy();
+    Picasso.with(this).cancelTag(this);
+  }
+
   @Override public void onBackPressed() {
     if (showHide.isChecked()) {
       showHide.setChecked(false);

picasso-sample/src/main/java/com/example/picasso/SampleContactsActivity.java

@@ -42,6 +42,7 @@ public class SampleContactsActivity extends PicassoSampleActivity
 
     ListView lv = (ListView) findViewById(android.R.id.list);
     lv.setAdapter(adapter);
+    lv.setOnScrollListener(new SampleScrollListener(this));
 
     getSupportLoaderManager().initLoader(ContactsQuery.QUERY_ID, null, this);
   }

picasso-sample/src/main/java/com/example/picasso/SampleContactsAdapter.java

@@ -61,6 +61,7 @@ public SampleContactsAdapter(Context context) {
     Picasso.with(context)
         .load(contactUri)
         .placeholder(R.drawable.contact_picture_placeholder)
+        .tag(context)
         .into(holder.icon);
   }
 

picasso-sample/src/main/java/com/example/picasso/SampleGridViewActivity.java

@@ -10,5 +10,6 @@ public class SampleGridViewActivity extends PicassoSampleActivity {
 
     GridView gv = (GridView) findViewById(R.id.grid_view);
     gv.setAdapter(new SampleGridViewAdapter(this));
+    gv.setOnScrollListener(new SampleScrollListener(this));
   }
 }

picasso-sample/src/main/java/com/example/picasso/SampleGridViewAdapter.java

@@ -44,6 +44,7 @@ public SampleGridViewAdapter(Context context) {
         .placeholder(R.drawable.placeholder) //
         .error(R.drawable.error) //
         .fit() //
+        .tag(context) //
         .into(view);
 
     return view;

picasso-sample/src/main/java/com/example/picasso/SampleListDetailActivity.java

@@ -43,6 +43,7 @@ public static ListFragment newInstance() {
       ListView listView = (ListView) LayoutInflater.from(activity)
           .inflate(R.layout.sample_list_detail_list, container, false);
       listView.setAdapter(adapter);
+      listView.setOnScrollListener(new SampleScrollListener(activity));
       listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
         @Override
         public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
@@ -83,6 +84,7 @@ public static DetailFragment newInstance(String url) {
       Picasso.with(activity)
           .load(url)
           .fit()
+          .tag(activity)
           .into(imageView);
 
       return view;

picasso-sample/src/main/java/com/example/picasso/SampleListDetailAdapter.java

@@ -45,6 +45,7 @@ public SampleListDetailAdapter(Context context) {
         .error(R.drawable.error)
         .resizeDimen(R.dimen.list_detail_image_size, R.dimen.list_detail_image_size)
         .centerInside()
+        .tag(context)
         .into(holder.image);
 
     return view;

picasso-sample/src/main/java/com/example/picasso/SampleScrollListener.java

@@ -0,0 +1,30 @@
+package com.example.picasso;
+
+import android.content.Context;
+import android.widget.AbsListView;
+
+import com.squareup.picasso.Picasso;
+
+public class SampleScrollListener implements AbsListView.OnScrollListener {
+  private final Context context;
+
+  public SampleScrollListener(Context context) {
+    this.context = context;
+  }
+
+  @Override
+  public void onScrollStateChanged(AbsListView view, int scrollState) {
+    final Picasso picasso = Picasso.with(context);
+    if (scrollState == SCROLL_STATE_IDLE || scrollState == SCROLL_STATE_TOUCH_SCROLL) {
+      picasso.resumeTag(context);
+    } else {
+      picasso.pauseTag(context);
+    }
+  }
+
+  @Override
+  public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
+                       int totalItemCount) {
+    // Do nothing.
+  }
+}