Question

我是Android的新手，我无法从图像uri转换为位图，然后在图像视图中显示它，但我在转换为位图时遇到未处理的异常，这里是代码：

const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const AotPlugin = require('@ngtools/webpack').AotPlugin;
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;

module.exports = (env) => {
    // Configuration in common to both client-side and server-side bundles
    const isDevBuild = !(env && env.prod);
    const sharedConfig = {
        stats: { modules: false },
        context: __dirname,
        resolve: { extensions: ['.js', '.ts'] },
        output: {
            filename: '[name].js',
            publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
        },
        module: {
            rules: [
                { test: /\.ts$/, include: /ClientApp/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader'] : '@ngtools/webpack' },
                { test: /\.html$/, use: 'html-loader?minimize=false' },
                { test: /\.css$/, use: ['to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize'] },
                { test: /\.(png|jpg|jpeg|gif|svg)$/, use: 'url-loader?limit=25000' }
            ]
        },
        plugins: [new CheckerPlugin()]
    };

    // Configuration for client-side bundle suitable for running in browsers
    const clientBundleOutputDir = './wwwroot/dist';
    const clientBundleConfig = merge(sharedConfig, {
        entry: { 'main-client': './ClientApp/boot.browser.ts' },
        output: { path: path.join(__dirname, clientBundleOutputDir) },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./wwwroot/dist/vendor-manifest.json')
            }),
            new webpack.ProvidePlugin({
                $: 'jquery',
                jQuery: 'jquery',
                'window.jQuery': 'jquery',
                Popper: ['popper.js', 'default'],
                // In case you imported plugins individually, you must also require them here:
                //Util: "exports-loader?Util!bootstrap/js/dist/util",
                //Dropdown: "exports-loader?Dropdown!bootstrap/js/dist/dropdown"
            })
        ].concat(isDevBuild ? [
            // Plugins that apply in development builds only
            new webpack.SourceMapDevToolPlugin({
                filename: '[file].map', // Remove this line if you prefer inline source maps
                moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
            })
        ] : [
                // Plugins that apply in production builds only
                new webpack.optimize.UglifyJsPlugin(),
                new AotPlugin({
                    tsConfigPath: './tsconfig.json',
                    entryModule: path.join(__dirname, 'ClientApp/app/app.module.browser#AppModule'),
                    exclude: ['./**/*.server.ts']
                })
            ])
    });

    // Configuration for server-side (prerendering) bundle suitable for running in Node
    const serverBundleConfig = merge(sharedConfig, {
        resolve: { mainFields: ['main'] },
        entry: { 'main-server': './ClientApp/boot.server.ts' },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./ClientApp/dist/vendor-manifest.json'),
                sourceType: 'commonjs2',
                name: './vendor'
            })
        ].concat(isDevBuild ? [] : [
            // Plugins that apply in production builds only
            new AotPlugin({
                tsConfigPath: './tsconfig.json',
                entryModule: path.join(__dirname, 'ClientApp/app/app.module.server#AppModule'),
                exclude: ['./**/*.browser.ts']
            })
        ]),
        output: {
            libraryTarget: 'commonjs',
            path: path.join(__dirname, './ClientApp/dist')
        },
        target: 'node',
        devtool: 'inline-source-map'
    });

    return [clientBundleConfig, serverBundleConfig];
};

有什么建议吗？先谢谢！

Answer 1

您没有正确选择图像。从onClick方法移除这三行代码，您将在onActivityResult内移动它们：

Uri imageUri = intent.getData();
        Bitmap bitmap= MediaStore.Images.Media.getBitmap(context.getContentResolver(), imageUri);
        imageView.setImageBitmap(bitmap);

然后在您的（可能）Activity覆盖onActivityResult中并执行以下内容：

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) 
 {
    super.onActivityResult(requestCode, resultCode, data);

if (requestCode == PICK_IMAGE && resultCode == RESULT_OK && data != null) {

    Uri imageUri = data.getData();
    try {
        Bitmap bitmap= MediaStore.Images.Media.getBitmap(getContentResolver(), imageUri);
        imageView.setImageBitmap(bitmap);
    } catch (IOException e) {
        e.printStackTrace();
      }
   }
}

Answer 2

请尝试使用此代码，这适用于我的应用。

document.addEventListener("keypress", function(event){
    console.log(event);
    var keyName = event.key;
});

将Image Uri从库转换为位图Android的问题

2 个答案: