Android(安卓)NetworkImageView点击查看大图自定义属性

package com.xxx/** * Copyright (C) 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import android.app.Dialog;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.text.TextUtils;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.AdapterView;import android.widget.ImageView;import com.android.volley.VolleyError;import com.android.volley.toolbox.ImageLoader;import com.android.volley.toolbox.ImageLoader.ImageContainer;import com.android.volley.toolbox.ImageLoader.ImageListener;import com.xxx.R;/** * Handles fetching an image from a URL as well as the life-cycle of the * associated request. */public class NetworkImageView extends ImageView {    /** The URL of the network image to load */    private String mUrl;    /**     * Resource ID of the image to be used as a placeholder until the network     * image is loaded.     */    private int mDefaultImageId;    /**     * Resource ID of the image to be used if the network response fails.     */    private int mErrorImageId;    /** Local copy of the ImageLoader. */    private ImageLoader mImageLoader;    /** Current ImageContainer. (either in-flight or finished) */    private ImageContainer mImageContainer;    private boolean isShowBigPhoto;    public NetworkImageView(Context context) {        this(context, null);    }    public NetworkImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public NetworkImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        //        isShowBigPhoto = attrs.getAttributeBooleanValue(        //                R.styleable.NetworkImageView.isShowBigPhoto, false);        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.NetworkImageView);        isShowBigPhoto = ta.getBoolean(R.styleable.NetworkImageView_isShowBigPhoto, false);        ta.recycle();    }    /**     * Sets URL of the image that should be loaded into this view. Note that     * calling this will immediately either set the cached image (if available)     * or the default image specified by     * {@link NetworkImageView#setDefaultImageResId(int)} on the view. NOTE: If     * applicable, {@link NetworkImageView#setDefaultImageResId(int)} and     * {@link NetworkImageView#setErrorImageResId(int)} should be called prior     * to calling this function.     *      * @param url The URL that should be loaded into this ImageView.     * @param imageLoader ImageLoader that will be used to make the request.     */    public void setImageUrl(String url, ImageLoader imageLoader) {        mUrl = url;        mImageLoader = imageLoader;        // The URL has potentially changed. See if we need to load it.        loadImageIfNecessary(false);    }    /**     * Sets the default image resource ID to be used for this view until the     * attempt to load it completes.     */    public void setDefaultImageResId(int defaultImage) {        mDefaultImageId = defaultImage;    }    /**     * Sets the error image resource ID to be used for this view in the event     * that the image requested fails to load.     */    public void setErrorImageResId(int errorImage) {        mErrorImageId = errorImage;    }    /**     * Loads the image for the view if it isn't already loaded.     *      * @param isInLayoutPass True if this was invoked from a layout pass, false     *            otherwise.     */    void loadImageIfNecessary(final boolean isInLayoutPass) {        int width = getWidth();        int height = getHeight();        boolean wrapWidth = false, wrapHeight = false;        if (getLayoutParams() != null) {            wrapWidth = getLayoutParams().width == LayoutParams.WRAP_CONTENT;            wrapHeight = getLayoutParams().height == LayoutParams.WRAP_CONTENT;        }        // if the view's bounds aren't known yet, and this is not a wrap-content/wrap-content        // view, hold off on loading the image.        boolean isFullyWrapContent = wrapWidth && wrapHeight;        if (width == 0 && height == 0 && !isFullyWrapContent) {            return;        }        // if the URL to be loaded in this view is empty, cancel any old requests and clear the        // currently loaded image.        if (TextUtils.isEmpty(mUrl)) {            if (mImageContainer != null) {                mImageContainer.cancelRequest();                mImageContainer = null;            }            setDefaultImageOrNull();            return;        }        // if there was an old request in this view, check if it needs to be canceled.        if (mImageContainer != null && mImageContainer.getRequestUrl() != null) {            if (mImageContainer.getRequestUrl().equals(mUrl)) {                // if the request is from the same URL, return.                return;            } else {                // if there is a pre-existing request, cancel it if it's fetching a different URL.                mImageContainer.cancelRequest();                setDefaultImageOrNull();            }        }        // Calculate the max image width / height to use while ignoring WRAP_CONTENT dimens.        int maxWidth = wrapWidth ? 0 : width;        int maxHeight = wrapHeight ? 0 : height;        // The pre-existing content of this view didn't match the current URL. Load the new image        // from the network.        ImageContainer newContainer = mImageLoader.get(mUrl, new ImageListener() {            @Override            public void onErrorResponse(VolleyError error) {                if (mErrorImageId != 0) {                    setImageResource(mErrorImageId);                }            }            @Override            public void onResponse(final ImageContainer response, boolean isImmediate) {                // If this was an immediate response that was delivered inside of a layout                // pass do not set the image immediately as it will trigger a requestLayout                // inside of a layout. Instead, defer setting the image by posting back to                // the main thread.                if (isImmediate && isInLayoutPass) {                    post(new Runnable() {                        @Override                        public void run() {                            onResponse(response, false);                        }                    });                    return;                }                if (response.getBitmap() != null) {                    setImageBitmap(response.getBitmap());                } else if (mDefaultImageId != 0) {                    setImageResource(mDefaultImageId);                }            }        }, maxWidth, maxHeight);        // update the ImageContainer to be the new bitmap container.        mImageContainer = newContainer;    }    private void setDefaultImageOrNull() {        if (mDefaultImageId != 0) {            setImageResource(mDefaultImageId);        } else {            setImageBitmap(null);        }    }    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        super.onLayout(changed, left, top, right, bottom);        loadImageIfNecessary(true);        if (isShowBigPhoto) {            this.setOnClickListener(onClickListener);        }    }    @Override    protected void onDetachedFromWindow() {        if (mImageContainer != null) {            // If the view was bound to an image request, cancel it and clear            // out the image from the view.            mImageContainer.cancelRequest();            setImageBitmap(null);            // also clear out the container so we can reload the image if necessary.            mImageContainer = null;        }        super.onDetachedFromWindow();    }    @Override    protected void drawableStateChanged() {        super.drawableStateChanged();        invalidate();    }    private ShowBidPhotoDialog dialog;    private View.OnClickListener onClickListener = new View.OnClickListener() {        public boolean onLongClick(View v) {            if (dialog == null) {                dialog = new ShowBidPhotoDialog(NetworkImageView.this.getContext(),                        ((BitmapDrawable) NetworkImageView.this.getDrawable()).getBitmap());                dialog.show();            }            return false;        }        @Override        public void onClick(View v) {            onLongClick(v);        }    };    class ShowBidPhotoDialog extends Dialog implements AdapterView.OnItemClickListener {        private Bitmap bitmap;        public ShowBidPhotoDialog(Context context, Bitmap catalogs) {            super(context, R.style.CustomProgressDialog);            this.setCanceledOnTouchOutside(true);            bitmap = catalogs;        }        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            this.setContentView(R.layout.big_photo_dialog);            ImageView bigImg = (ImageView) this.findViewById(R.id.imageBig);            bigImg.setImageBitmap(bitmap);            //            bitmap.recycle();        }        @Override        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {            this.hide();        }    }}

注意layout中自定义属性获取：

TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.NetworkImageView);
isShowBigPhoto = ta.getBoolean(R.styleable.NetworkImageView_isShowBigPhoto, false);
ta.recycle();

在value/attrs.xml中定义属性

<resources>      <declare-styleable name="NetworkImageView">        <attr name="isShowBigPhoto" format="boolean" />    </declare-styleable></resources>

在layout中使用：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:myViewXmlns="http://schemas.android.com/apk/res/com.xxx"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/parents_bg" ><com.xxx.NetworkImageView            android:id="@+id/draw_image"            android:layout_width="267dp"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:paddingTop="20dp"            android:scaleType="fitCenter"            myViewXmlns:isShowBigPhoto="true" /></RelativeLayout>

参考：http://www.cnblogs.com/trinea/archive/2012/11/14/2768271.html

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