实例：使用OKGO下载网络压缩包资源，然后解压缩放在本地使用
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一，前期基础知识储备
1）svg图片较大，所以需要压缩为zip包后放在服务器上，下载使用；
2）使用OKGO库进行网络资源下载；
3）使用工具库Blankj中的解压缩工具进行解压缩后，然后保存在本地；
4）下载并且解压缩zip成功后，删除本地zip包，只保留解压缩得到的svg资源。
二，上代码，具体实现
1）引入OKGO和Blankj依赖：
implementation 'com.lzy.net:okgo:3.0.4'
implementation 'com.blankj:utilcode:1.25.9'注：如果有使用RxJava的依赖，OKGO的依赖需要进行修改；另外此库已经停止维护。
2）使用OKGO前需要进行的声明：
OkHttpClient.Builder builder = new OkHttpClient.Builder();
//全局的读取超时时间
builder.readTimeout(30000L, TimeUnit.MILLISECONDS);
//全局的写入超时时间
builder.writeTimeout(30000L, TimeUnit.MILLISECONDS);
//全局的连接超时时间
builder.connectTimeout(100000L, TimeUnit.MILLISECONDS);
builder.proxy(Proxy.NO_PROXY);
builder.hostnameVerifier(new HostnameVerifier()
@Override
public boolean verify(String hostname, SSLSession session)
try
if (TextUtils.isEmpty(hostname) || TextUtils.isEmpty(session.getPeerHost()))
return false;
return hostname.equals(session.getPeerHost());
catch (Exception e)
return false;
);
OkGo.getInstance().init(this).setOkHttpClient(builder.build()).setRetryCount(3);库已停止维护，所以后续随着targetSdkVersion的升级，声明也需要自己做出相应修改。博主应用版本为29。
3）下载zip包的代码实现：
private void onDownLoadAndSaveSvg(String svgUrl, String svgName)
if (NetCheckUtils.isNetWorkEnable(this))
/*Api29 android10 存储结构有变 需要进行其他处理*/
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q)
OkGo.<File>get(svgUrl)
.execute(new FileCallback(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath()
+ File.separator + "lovedrawing", svgName + ".zip")
@Override
public void onSuccess(Response<File> response)
Log.d(TAG, "onSuccess: file 下载成功");
isDownLoad = true;
String zipFileName = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath()
+ File.separator + "lovedrawing" + File.separator + svgName + ".zip";
svgUnzipPath = ZipAndReadSvgUtils.unZipDownlaodSvgToSdCard(PaintActivity.this,
zipFileName, svgName);
File f = response.body();
if (f != null && f.exists())
f.delete();
InputStream mInputStream = ZipAndReadSvgUtils.readSvgFromSdCard(PaintActivity.this, svgName);
if (mInputStream != null)
parseSvgXml(mInputStream);
drawingBoardView.init(PaintActivity.this, mInputStream);
initColorRecyData();
initPopuWindowLayout();
else
noNetWorkRl.setVisibility(View.GONE);
@Override
public void onError(Response<File> response)
Log.d(TAG, "onError: file出错,," + response + ",," + response.body()
+ ",," + response.message() + ",," + response.getException() + ",," + response.isSuccessful());
noNetWorkRl.setVisibility(View.VISIBLE);
@Override
public void downloadProgress(Progress progress)
Log.d(TAG, "downloadProgress: 下载过程,," + progress.totalSize + ",," + progress);
);
else
onMIUIDownLoadAndSaveSvg(svgUrl, svgName);
else
noNetWorkRl.setVisibility(View.VISIBLE);
ToastUtil.showToast(PaintActivity.this, R.string.net_fail);
因为API29 的存储结构发生变化，所以需要单独再做一次下载处理，代码如下：
private void onMIUIDownLoadAndSaveSvg(String svgUrl, String svgName)
File tempFile = getExternalFilesDir("TempProject");
OkGo.<File>get(svgUrl)
.execute(new FileCallback((tempFile != null ? tempFile.getAbsolutePath() : null)
+ File.separator + "lovedrawing", svgName + ".zip")
@Override
public void onSuccess(Response<File> response)
Log.d(TAG, "onSuccess: MIUI file 下载成功");
isDownLoad = true;
String zipFileName = null;
if (tempFile != null)
zipFileName = tempFile.getAbsolutePath()
+ File.separator + "lovedrawing" + File.separator + svgName + ".zip";
svgUnzipPath = ZipAndReadSvgUtils.unZipDownlaodSvgToSdCard(PaintActivity.this,
zipFileName, svgName);
File f = response.body();
if (f != null && f.exists())
f.delete();
InputStream mInputStream = ZipAndReadSvgUtils.readSvgFromSdCard(PaintActivity.this, svgName);
if (mInputStream != null)
parseSvgXml(mInputStream);
drawingBoardView.init(PaintActivity.this, mInputStream);
initColorRecyData();
initPopuWindowLayout();
else
noNetWorkRl.setVisibility(View.GONE);
@Override
public void onError(Response<File> response)
Log.d(TAG, "onError: MIUI file出错,," + response + ",," + response.body()
+ ",," + response.message() + ",," + response.getException() + ",," + response.isSuccessful());
noNetWorkRl.setVisibility(View.VISIBLE);
@Override
public void downloadProgress(Progress progress)
Log.d(TAG, "downloadProgress: MIUI 下载过程,," + progress.totalSize + ",," + progress);
);
内部代码解析：
①svgUrl —— 即为放置svg zip包的网络服务器地址；
②下载成功后，将得到的zip包保存在本地的地址如下：
new FileCallback(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath()
+ File.separator + "lovedrawing", svgName + ".zip")
③得到zip包，利用工具类进行解压缩，然后将下载好的zip进行删除：
String zipFileName = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath()
+ File.separator + "lovedrawing" + File.separator + svgName + ".zip";
svgUnzipPath = ZipAndReadSvgUtils.unZipDownlaodSvgToSdCard(PaintActivity.this,
zipFileName, svgName);
File f = response.body();
if (f != null && f.exists())
f.delete();
4）使用到的ZipAndReadSvgUtils 解压缩工具类如下：
public class ZipAndReadSvgUtils
private static final String TAG = "ZipAndReadSvgUtils";
private static final String SVGFILENAME = "_localSvg";
/**
* 正式项目中使用——解压缩网络下好的SVG
* @param context
* @param zipFileName
* @param svgName
*/
public static String unZipDownlaodSvgToSdCard(Context context, String zipFileName,
String svgName)
String svgUnzipPath = "";
File zipFile = new File(zipFileName);
Log.d(TAG, "unZipDownlaodSvgToSdCard: 压缩文件所在地址," + zipFile.getAbsolutePath());
String fileName = "";
File saveJsonFile = context.getExternalFilesDir("netToLocalSvg");
if (saveJsonFile != null)
fileName = saveJsonFile.getAbsolutePath() + File.separator + svgName + SVGFILENAME;
File file = new File(fileName);
try
ZipUtils.unzipFile(zipFile, file);
List<File> files = FileUtils.listFilesInDir(file);
svgUnzipPath = files.get(0).getAbsolutePath();
Log.d(TAG, "unZipDownlaodSvgToSdCard: SVG解压缩文件地址，" + files.get(0).getAbsolutePath());
catch (IOException e)
e.printStackTrace();
return svgUnzipPath;
/**
* 正式项目中使用——读取存在本地SDCard下的SVG
* @param context
* @return
*/
public static InputStream readSvgFromSdCard(Context context, String svgName)
String fileName = "";
File saveJsonFile = context.getExternalFilesDir("netToLocalSvg");
if (saveJsonFile != null)
fileName = saveJsonFile.getAbsolutePath() + File.separator + svgName + SVGFILENAME;
File file = new File(fileName);
InputStream is = null;
try
List<File> files= FileUtils.listFilesInDir(file);
Log.d(TAG, "readSvgFromSdCard: 读，" + files.get(0));
String svgString = FileIOUtils.readFile2String(files.get(0));
is = ConvertUtils.string2InputStream(svgString, "UTF-8");
Log.d(TAG, "readSvgFromSdCard: 读取本地存储svg流为，" + is);
catch (Exception e)
e.printStackTrace();
return is;
最终得到svg资源地址：
/storage/emulated/0/Android/data/com.love.drawing.draw/files/netToLocalSvg/animal_010_localSvg/animal_010.svg
三，知识延伸
自定义View中动态添加 父容器布局 —— 采用静态布局的形式添加
下面代码中的自定义View继承自帧布局 FrameLayout 。
FrameLayout.LayoutParams lp = new LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.TOP | Gravity.END);
lp.setMargins(0, ConvertUtils.dp2px(64), width + ConvertUtils.dp2px(6), 0);
LayoutInflater inflater3 = LayoutInflater.from(mContext);
preControlLl = inflater3.inflate(R.layout.view_preview_ll, null);
LinearLayout closeRoot = preControlLl.findViewById(R.id.close_root);
TextView closeText = preControlLl.findViewById(R.id.close_text);
closeText.setTypeface(Typeface.createFromAsset(mContext.getAssets(), "fonts/Roboto-Regular.ttf"));
ImageView closeImg = preControlLl.findViewById(R.id.close_img);
closeRoot.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
... ...
);
preControlLl.setLayoutParams(lp);
addView(preControlLl);注：使用 LayoutParams 动态指定父容器的大小，位置，边距等信息。
静态布局 view_preview_ll 如下：
<?xml version="1.0" encoding="utf-8"?>
<com.game.jianbihua.view.RadiusCardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="25dp"
app:cardMaxElevation="4dp"
app:rcv_bottomLeftRadiu="3dp"
app:rcv_topLeftRadiu="3dp">
<LinearLayout
android:id="@+id/close_root"
android:layout_width="wrap_content"
android:layout_height="25dp"
android:layout_gravity="top|end"
android:background="@color/home_coins"
android:gravity="center"
android:orientation="horizontal">
<ImageView
android:id="@+id/close_img"
android:layout_width="6dp"
android:layout_height="12dp"
android:layout_gravity="center_vertical"
android:layout_marginStart="4dp"
android:scaleType="fitCenter"
android:src="@drawable/view_pre_left" />
<TextView
android:id="@+id/close_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginStart="4dp"
android:layout_marginEnd="4dp"
android:gravity="center"
android:text="Preview"
android:textColor="@color/pureWhite"
android:textSize="12sp" />
</LinearLayout>
</com.game.jianbihua.view.RadiusCardView>
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