如何将webView缓存移动到SD？

我已经看到一些应用程序,如海豚浏览器(不是高清版本,正常的)利用缓存到SD的webview但我似乎无法弄清楚如何做到这一点,有谁知道如何做到这一点或指出我正确的方向？任何帮助是极大的赞赏!谢谢 :)

这篇文章详细描述了如何更改webview缓存存储以使用SD卡:http: //www.devahead.com/blog/2012/01/saving-the-android-webview-cache-on-the-sd-卡/

我已经在我的应用程序中对它进行了测试,并且它已被证明有效.

public class MainApplication extends Application {
    // ...

    @Override
    public File getCacheDir() {
        // NOTE: this method is used in Android 2.2 and higher
        File cachePath = this.getExternalCachePath();
        return cachePath != null ? cachePath : super.getCacheDir();
    }

    private File getExternalCachePath() {
        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
            File externalStorageDir = Environment.getExternalStorageDirectory();
            // {SD_PATH}/Android/data/com.package.name/cache
            File extStorageAppCachePath = new File(externalStorageDir, "Android" + File.separator + "data" + File.separator + this.getPackageName() + File.separator + "cache");

            return extStorageAppCachePath;
        }

        return null;
    }
}

public class SomeWebViewActivity extends Activity {
    // ...

    @Override
    public File getCacheDir() {
        // Android 2.1 and lower
        return this.getApplicationContext().getCacheDir();
    }
}