我想製作一個應用程序圖標列表並將其顯示在listView中。我已經在ArrayList變量array中存儲了包名稱。使用此代碼：如何使用ArrayAdapter在ListView中設置可繪製變量android
Drawable icon=getPackageManager().getApplicationLogo(array.toString());
和存儲drawable變量icon所有的圖標。現在我想設置的變量icon與ArrayAdapter，才能在listview。但是，以顯示它，我不知道該怎麼辦它可以幫助我..
如果你想使你的列表視圖元素動態的，例如與圖像&包名，創建對象類：
public class AppIcon {
private Drawable mDrawable;
private String mPackageName;
public AppIcon(Drawable drawable, String packageName) {
this.mDrawable = drawable;
this.mPackageName = packageName;
}
public Drawable getmDrawable() {
return mDrawable;
}
public String getmPackageName() {
return mPackageName;
}
}
創建以下自定義RecyclerView adapter：
public class ImageArrayAdapter extends RecyclerView.Adapter<ImageArrayAdapter.ViewHolder> {
/**
* list of devices
*/
private List<AppIcon> imageList = new ArrayList<>();
private Context mContext;
private IViewHolderClickListener mListener;
public ImageArrayAdapter(Context context, List<AppIcon> objects, IViewHolderClickListener listener) {
this.mContext = context;
this.imageList = objects;
this.mListener = listener;
}
@Override
public ImageArrayAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View inflater = LayoutInflater.from(parent.getContext()).inflate(R.layout.listview_item, parent, false);
return new ViewHolder(inflater, mListener);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
AppIcon item = imageList.get(position);
holder.image.setImageDrawable(item.getmDrawable());
holder.packageName.setText(item.getmPackageName());
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemCount() {
return imageList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public ImageView image;
public TextView packageName;
public IViewHolderClickListener mListener;
/**
* ViewHolder
*
* @param v
* @param listener
*/
public ViewHolder(View v, IViewHolderClickListener listener) {
super(v);
mListener = listener;
image = (ImageView) v.findViewById(R.id.image);
packageName = (TextView) v.findViewById(R.id.package_name);
v.setOnClickListener(this);
}
@Override
public void onClick(View v) {
mListener.onClick(v);
}
}
}
這是更好要使用RecyclerView，特別是在處理大量圖像時。
build.gradle：
compile 'com.android.support:appcompat-v7:24.0.0'
compile 'com.android.support:recyclerview-v7:+'
你可以看到ViewHolder握着你的所有嵌套字段在您的列表視圖項目，將與太調度click事件：
public interface IViewHolderClickListener {
void onClick(View v);
}
在你的活動，創建您的適配器和將其設置爲適配器的RecyclerView。此外，隨着圖像列表初始化適配器：
public class DescriptionActivity extends Activity {
private RecyclerView imageRecyclerView = null;
private ImageArrayAdapter imageAdapter = null;
private SwipeRefreshLayout mSwipeRefreshLayout;
private ArrayList<AppIcon> imageList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity);
//setup recyclerview
imageRecyclerView = (RecyclerView) findViewById(R.id.image_list);
imageList = new ArrayList<>();
try {
Drawable icon = getPackageManager().getApplicationIcon(getPackageName());
imageList.add(new AppIcon(icon, getPackageName()));
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
imageAdapter = new ImageArrayAdapter(DescriptionActivity.this, imageList, new IViewHolderClickListener() {
@Override
public void onClick(View v) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(DescriptionActivity.this, "click on item detected", Toast.LENGTH_SHORT).show();
}
});
}
});
//set layout manager
imageRecyclerView.setLayoutManager(new GridLayoutManager(this, 1, LinearLayoutManager.VERTICAL, false));
imageRecyclerView.setAdapter(imageAdapter);
//setup swipe refresh
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swiperefresh);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
runOnUiThread(new Runnable() {
@Override
public void run() {
//refresh list here
imageAdapter.notifyDataSetChanged();
mSwipeRefreshLayout.setRefreshing(false);
}
});
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
activity.xml樣子：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swiperefresh"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/image_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</android.support.v4.widget.SwipeRefreshLayout>
</FrameLayout>
和listview_item.xml包含每個圖像/包名列表視圖項的佈局：
<ImageView
android:id="@+id/image"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:scaleType="center"
android:layout_weight="0.5" />
<TextView
android:id="@+id/package_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:fontFamily="sans-serif"
android:textSize="18sp" />
另外，還要注意optionnaly我添加了一個SwipeRefreshLayout刷卡刷新列表視圖中的材料的風格
你可以傳遞一個drawable的id嗎？ – Eenvincible
感謝兄弟，我一定會試試看，並告訴你結果 – Adarsh
@Eenvincible是的，如果有一個'int'而不是存儲'Drawable'會更好，但如果操作者想從其他應用中獲取圖標，似乎很難獲得這些 –
繪項目只是整數值。因此，不使用Drawable類，您可以使用ArrayList數組來存儲繪圖。
ArrayList<Integer> list = {R.drawable.icon1, R.drawable.icon2};
然後你就可以獲取使用
getResources().getDrwawable(list.get(iconIndex));
希望這能解決你的問題
你有一個適配器此列表中的圖標？如果是這樣，發佈您的代碼 –
不，我還沒有創建它 – Adarsh
@Kurlicue我知道如何使適配器爲ArrayAdapter但不適用於任何可繪製對象的ArrayAdapter –
Adarsh