Android之WebView仿微信中图片操作（含二维码识别）

来源：互联网发布：中学生直播软件编辑：程序博客网时间：2024/05/16 09:18

HitTestResult类： WebView中被点击内容的相应信息，通过WebView的getHitTestResult()获取！

自定义WebView

/** * 自定义WebView，长按图片获取图片url * @author LinZhang * */public class CustomWebView extends WebView implements OnLongClickListener{    private Context context;    private LongClickCallBack mCallBack;    public CustomWebView(Context context, LongClickCallBack mCallBack) {        super(context);        this.context = context;        this.mCallBack = mCallBack;        initSettings();    }    private void initSettings() {        // 初始化设置        WebSettings mSettings = this.getSettings();        mSettings.setJavaScriptEnabled(true);//开启javascript        mSettings.setDomStorageEnabled(true);//开启DOM        mSettings.setDefaultTextEncodingName("utf-8");//设置字符编码        //设置web页面        mSettings.setAllowFileAccess(true);//设置支持文件流        mSettings.setSupportZoom(true);// 支持缩放        mSettings.setBuiltInZoomControls(true);// 支持缩放        mSettings.setUseWideViewPort(true);// 调整到适合webview大小        mSettings.setLoadWithOverviewMode(true);// 调整到适合webview大小        mSettings.setDefaultZoom(ZoomDensity.FAR);// 屏幕自适应网页,如果没有这个，在低分辨率的手机上显示可能会异常        mSettings.setRenderPriority(RenderPriority.HIGH);        //提高网页加载速度，暂时阻塞图片加载，然后网页加载好了，在进行加载图片        mSettings.setBlockNetworkImage(true);        mSettings.setAppCacheEnabled(true);//开启缓存机制        setWebViewClient(new MyWebViewClient());        setOnLongClickListener(this);    }    @Override    public boolean onLongClick(View v) {        // 长按事件监听（注意：需要实现LongClickCallBack接口并传入对象）        final HitTestResult htr = getHitTestResult();//获取所点击的内容        if (htr.getType() == WebView.HitTestResult.IMAGE_TYPE) {//判断被点击的类型为图片            mCallBack.onLongClickCallBack(htr.getExtra());        }        return false;    }    private class MyWebViewClient extends WebViewClient {        /**         * 加载过程中 拦截加载的地址url         * @param view         * @param url  被拦截的url         * @return         */        @Override        public boolean shouldOverrideUrlLoading(WebView view, String url) {            return super.shouldOverrideUrlLoading(view, url);        }        /**         * 页面加载过程中，加载资源回调的方法         * @param view         * @param url         */        @Override        public void onLoadResource(WebView view, String url) {            super.onLoadResource(view, url);        }        /**         * 页面加载完成回调的方法         * @param view         * @param url         */        @Override        public void onPageFinished(WebView view, String url) {            super.onPageFinished(view, url);            // 关闭图片加载阻塞            view.getSettings().setBlockNetworkImage(false);        }        /**         * 页面开始加载调用的方法         * @param view         * @param url         * @param favicon         */        @Override        public void onPageStarted(WebView view, String url, Bitmap favicon) {            super.onPageStarted(view, url, favicon);        }        @Override        public void onReceivedError(WebView view, int errorCode,                String description, String failingUrl) {            super.onReceivedError(view, errorCode, description, failingUrl);        }        @Override        public void onScaleChanged(WebView view, float oldScale, float newScale) {            super.onScaleChanged(view, oldScale, newScale);            CustomWebView.this.requestFocus();            CustomWebView.this.requestFocusFromTouch();        }    }    /**     * 长按事件回调接口，传递图片地址     * @author LinZhang     */    public interface LongClickCallBack{        /**用于传递图片地址*/        void onLongClickCallBack(String imgUrl);    }}

自定义Dialog，用于长按图片弹出

/** * 弹出图片操作Dialog * @author LinZhang * */public abstract class CustomDialog extends Dialog {    private Context context;    /**     * 构造器     * @param context 上下文     * @param layoutId 资源文件id     */    public CustomDialog(Context context, int layoutId) {        super(context, R.style.CustomDialog);        this.context = context;        createDialog(layoutId);    }    /**     * 设置dialog     * @param layoutId     */    public  void createDialog(int layoutId){        setContentView(layoutId);        Window window = getWindow();        WindowManager.LayoutParams params = window.getAttributes();        params.width = WindowManager.LayoutParams.WRAP_CONTENT;        params.height = WindowManager.LayoutParams.WRAP_CONTENT;        params.gravity = Gravity.CENTER;        window.setAttributes(params);        initViews();        if(!(context instanceof Activity)){            getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);        }    }    public void closeDialog(){        dismiss();    }    /**     * 用于初始化相应的控件     */    public abstract void initViews();}

MainActivity：

public class MainActivity extends Activity implements LongClickCallBack{    private CustomWebView mCustomWebView;    private CustomDialog mCustomDialog;    private ArrayAdapter<String> adapter;    private boolean isQR;//判断是否为二维码    private Result result;//二维码解析结果    @SuppressLint("HandlerLeak")    private Handler handler = new Handler(){        public void handleMessage(Message msg) {            if (msg.what == 0){                if (isQR){                     adapter.add("识别图中二维码");                   }                adapter.notifyDataSetChanged();            }        };    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initWebView();    }    private void initWebView() {        // 初始WebView化控件        mCustomWebView = new CustomWebView(this, this);        mCustomWebView.loadUrl("http://keeganlee.me/post/android/20121206");//加载页面        mCustomWebView.setFocusable(true);        mCustomWebView.setFocusableInTouchMode(true);        addContentView(mCustomWebView, new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));    }    @Override    public void onLongClickCallBack(final String imgUrl) {        // 获取到图片地址后做相应的处理        new Thread(){            public void run() {                decodeImage(imgUrl);                handler.sendEmptyMessage(0);            };        }.start();        showDialog();    }    /**     * 判断是否为二维码     * @param url 图片地址     * @return     */    private boolean decodeImage(String sUrl){        result = DecodeImage.handleQRCodeFormBitmap(getBitmap(sUrl));        if(result == null){            isQR = false;        }else {            isQR = true;        }        return isQR;    }    /**     * 根据地址获取网络图片     * @param sUrl 图片地址     * @return     * @throws IOException     */    public static Bitmap getBitmap(String sUrl){        try {            URL url = new URL(sUrl);            HttpURLConnection conn = (HttpURLConnection)url.openConnection();            conn.setConnectTimeout(5000);            conn.setRequestMethod("GET");            if(conn.getResponseCode() == 200){                InputStream inputStream = conn.getInputStream();                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);                return bitmap;            }        } catch (Exception e) {            e.printStackTrace();        }        return null;   }    /**     * 显示Dialog     * @param v     */    private void  showDialog() {        adapter = new ArrayAdapter<String>(this,R.layout.item_dialog);          adapter.add("发送给朋友");          adapter.add("保存到手机");          adapter.add("收藏");        mCustomDialog = new CustomDialog(this, R.layout.custom_dialog) {            @Override            public void initViews() {                // 初始CustomDialog化控件                ListView mListView = (ListView) findViewById(R.id.lv_dialog);                mListView.setAdapter(adapter);                 mListView.setOnItemClickListener(new OnItemClickListener() {                    @Override                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                        // 点击事件                        switch (position) {                        case 0:                            Toast.makeText(MainActivity.this, "已发送给朋友", Toast.LENGTH_LONG).show();                            closeDialog();                            break;                        case 1:                            Toast.makeText(MainActivity.this, "已保存到手机", Toast.LENGTH_LONG).show();                            closeDialog();                            break;                        case 2:                            Toast.makeText(MainActivity.this, "已收藏", Toast.LENGTH_LONG).show();                            closeDialog();                            break;                        case 3:                            Toast.makeText(MainActivity.this, "二维码识别结果: " + result.toString(), Toast.LENGTH_LONG).show();                                   closeDialog();                            break;                        }                    }                });            }        };        mCustomDialog.show();    }}

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