Android——app的版本更新（强制更新/非强制更新）

比眉伴天荒 2022-06-02 01:23 599阅读 0赞

**1.App版本检测：**

要实现App的更新下载，我们上面介绍了，前提是服务器要保存一个App的版本号（通常的方式是保存versionCode，当然你要对比versionName也没关系）。当用户去手动检测版本，或者进入首页自动检测时，第一步是需要请求服务器的版本号，拿到版本号之后与当前App版本号（当前版本号可通过PackageInfo获取）进行对比。服务器返回的版本号大于当前App版本号，证明App已经有更新，那么进入第2步。

**2.Apk下载**

Apk文件是保存在服务器的。我们可以通过Http流将其下载到本地手机，然后更新安装。[Android][]中下载的方式很多种：HttpUrlConnection，Retrofit，okHttp，以及[android][Android]原生的下载工具类DownLoadManager 等等。我们采用的方式是Google推荐的下载工具类DownLoadManager。关于DownLoadManager的使用其实很简单，简单概括如下：

（1）通过getSystemService获取DownLoadManager。

（2）初始化DownLoadManager的Request，构建下载请求。

（3）调用DownLoadManager的enqueue异步发起请求，该方法返回值为标识当前下载任务的id，即downloadId。

（4）当下载完成后，系统会发出条件为android.intent.action.DOWNLOAD\_COMPLETE的广播，我们可以自定义广播接受器，然后在onReceive中处理下载完成的逻辑即可。

我们使用OkHttp实现版本更新下载：

**添加依赖：**

compile 'com.google.code.gson:gson:2.8.2'
    compile 'com.squareup.okhttp3:okhttp:3.9.1'

**封装OKHttpUtils**

public class OKHttpUtils {
        private static volatile OKHttpUtils instance;
        private final OkHttpClient client;
    
        private Handler handler = new Handler();
        private OKHttpUtils(){
            client = new OkHttpClient();
        }
        public static OKHttpUtils getInstance(){
            if (null == instance){
                synchronized (OKHttpUtils.class){
                    if (instance==null){
                        instance = new OKHttpUtils();
                    }
                }
            }
            return instance;
        }
        public void get(String url, Map<String, String> map, final NetCallBack callBack, final Class clazz) {
            // http://www.wuxirui.com/api/checkversion.php?version=2.0.2&from=android // 1.http://www.wuxirui.com/api/checkversion.php // 2.http://www.wuxirui.com/api/checkversion.php?version=2.0.2 & // 3.http://www.wuxirui.com/api/checkversion.php? if (TextUtils.isEmpty(url)) {
                return;
            }
    
            StringBuffer sb = new StringBuffer(url);
    
            // 是否含有? （2，3） if (url.contains("?")) {
                // 问号是否是最后一个字符，是3 否2 if (url.endsWith("?")) {
                    for (Map.Entry entry : map.entrySet()) {
                        sb.append(entry.getKey())
                                .append("=")
                                .append(entry.getValue())
                                .append("&");
                    }
                } else { // 问号不是最后一个字符2 for (Map.Entry entry : map.entrySet()) {
                        sb.append("&")
                                .append(entry.getKey())
                                .append("=")
                                .append(entry.getValue());
                    }
                    sb.append("&");
                }
            } else { // 不包含？ if (!map.isEmpty()) {
                    sb.append("?");
                    for (Map.Entry entry : map.entrySet()) {
                        sb.append(entry.getKey())
                                .append("=")
                                .append(entry.getValue())
                                .append("&");
                    }
                }
            }
    
            sb.deleteCharAt(sb.lastIndexOf("&"));
            Log.i("zzz", "get url is: " + sb);
    
            Request request = new Request.Builder()
                    .url(sb.toString())
                    .get()
                    .build();
    
            Call call = client.newCall(request);
            call.enqueue(new Callback() {
                @Override public void onFailure(Call call, final IOException e) {
                    Log.e("zzz", "onFailure: " + e.getMessage());
                    handler.post(new Runnable() {
                        @Override public void run() {
                            callBack.onFailed(e);
                        }
                    });
    
                }
    
                @Override public void onResponse(Call call, Response response) throws IOException {
                    String result = response.body().string();
                    Log.i("zzz", "onResponse: " + result);
                    if (!TextUtils.isEmpty(result)) {
                        Gson gson = GsonUtils.getInstance();
    
                        final Object o = gson.fromJson(result, clazz);
                        handler.post(new Runnable() {
                            @Override public void run() {
                                callBack.onSuccess(o);
                            }
                        });
                    }
                }
            });
        }
        public void download(String url, final File file, final DownLoadListener listener) {
    // /sdcard/download/aaa.apk // 父目录是否存在 File parent = file.getParentFile();
            if (!parent.exists()) {
                parent.mkdir();
            }
            // 文件是否存在 if (!file.exists()) {
                try {
                    file.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
    
            Request request = new Request.Builder()
                    .url(url)
                    .build();
    
            Call call = client.newCall(request);
    
            call.enqueue(new Callback() {
                @Override public void onFailure(Call call, final IOException e) {
                    handler.post(new Runnable() {
                        @Override public void run() {
                            listener.failed(e);
                        }
                    });
                }
    
                @Override public void onResponse(Call call, Response response) throws IOException {
                    ResponseBody body = response.body();
                    // 获取文件总长度 long totalLength = body.contentLength();
                    try {
                        InputStream is = body.byteStream();
                        FileOutputStream fos = new FileOutputStream(file);
                        byte[] buf = new byte[2048];
                        int length = 0;
                        int sum = 0;
                        while ((length = is.read(buf, 0, buf.length)) != -1) {
                            sum += length;
                            long progress = sum * 100 / totalLength;
                            listener.progress(progress);
                            fos.write(buf, 0, length);
                        }
                        fos.flush();
                        is.close();
                        fos.close();
                        listener.success(file.getAbsolutePath());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });
    
        }
    }

定义接口：

**NetCallBack**

public interface NetCallBack {
        void onSuccess(Object o);
        void onFailed(Exception e);
    }

DownLoadListener

public interface DownLoadListener {
        void success(String path);
        void failed(Exception e);
        void progress(long progress);
    }

gson单例模式：

**GsonUtils**

public class GsonUtils {
        private static Gson instance;
            private GsonUtils(){
    
            }
            public static Gson getInstance(){
                if (instance==null){
                    instance = new Gson();
                }
                return instance;
            }
    }

VersionUtils

public class VersionUtils {
        public static String getVersionName(Context context) {
            String versionName = "";
            PackageManager packageManager = context.getPackageManager();
    
            String packageName = context.getPackageName();
    
            try {
                PackageInfo packageInfo = packageManager.getPackageInfo(packageName, 0);
                versionName = packageInfo.versionName;
    
            } catch (PackageManager.NameNotFoundException e) {
                e.printStackTrace();
            }
    
            return versionName;
    
        }
    }

MainActivity

public class MainActivity extends AppCompatActivity {
        private static final String TAG = "MainActivity";
        private String updateUrl = "http://www.wuxirui.com/api/checkversion.php";
    
        //http://www.wuxirui.com/download/jinritoutiao.apk private String path = "/download/";
        private Button btn;
        private ProgressBar progressBar;
        private TextView tv_pro;
    
        @SuppressLint("HandlerLeak")
        private Handler handler = new Handler() {
            @Override public void handleMessage(Message msg) {
                super.handleMessage(msg);
                int i = msg.what;
                if (i==100){
                    tv_pro.setVisibility(View.GONE);
                    progressBar.setVisibility(View.GONE);
                }else {
                    tv_pro.setText(i + "%");
                    progressBar.setProgress(i);
    
                }
    
            }
        };
    
        @Override protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            btn = findViewById(R.id.btn);
            progressBar = findViewById(R.id.progressBar);
            tv_pro = findViewById(R.id.tv_pro);
    
            String versionName = VersionUtils.getVersionName(this);
            Log.i("zzz", "versionName: " + versionName);
    
            Map<String, String> map = new HashMap<>();
            map.put("version", versionName);
    
            // if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                File externalStorageDirectory = Environment.getExternalStorageDirectory();
                // /sdcard/download/ String absolutePath = externalStorageDirectory.getAbsolutePath();
                path = absolutePath + path;
            }
    
            OKHttpUtils.getInstance().get(updateUrl, map, new NetCallBack() {
                @Override public void onSuccess(Object o) {
                    if (o instanceof MessageBean) {
                        MessageBean info = (MessageBean) o;
                        if (info != null) {
                            if (info.isSuccess()) {
                                MessageBean.ResultBean result1 = info.getResult();
    
                                final MessageBean.ResultBean result = info.getResult();
                                // 有更新 if (result.isHasnewversion()) {
                                    boolean isMust = result.isMustupdate();
                                    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                                    builder.setTitle("更新提示")
                                            .setMessage(isMust ? "需要立即更新" : "是否需要更新")
                                            .setPositiveButton("更新", new DialogInterface.OnClickListener() {
                                                @Override public void onClick(DialogInterface dialogInterface, int i) {
                                                    tv_pro.setVisibility(View.VISIBLE);
                                                    progressBar.setVisibility(View.VISIBLE);
                                                    String url = result.getUrl();
    
                                                    // http://www.wuxirui.com/download/jinritoutiao.apk if (url.contains(".")) {
                                                        String typeName = url.substring(url.lastIndexOf(".") + 1);
                                                        if (url.contains("/")) {
                                                            String filename = url.substring(url.lastIndexOf("/") + 1, url.lastIndexOf("."));
                                                            path = path + filename + "." + typeName;
                                                        }
                                                    }
    
                                                    // 下载 download(result.getUrl(), new File(path), new DownLoadListener() {
                                                        @Override public void success(String path) {
                                                            Log.i(TAG, "success: " + path);
                                                            // 启动自动安装 installApk(new File(path));
                                                        }
    
                                                        @Override public void failed(Exception e) {
                                                            Log.e(TAG, "failed: " + e.getMessage());
                                                        }
    
                                                        @Override public void progress(long progress) {
                                                            Log.i(TAG, "progress: " + progress);
                                                            handler.sendEmptyMessageDelayed((int) progress, 1000);
                                                        }
                                                    });
                                                }
                                            });
                                    if (!isMust) {
                                        builder.setNegativeButton("稍候", new DialogInterface.OnClickListener() {
                                            @Override public void onClick(DialogInterface dialogInterface, int i) {
    
                                            }
                                        });
                                    }
    
                                    builder.create().show();
                                }
    
                            }
                        }
                    }
                }
    
                @Override public void onFailed(Exception e) {
    
                }
            }, MessageBean.class);
        }
    
        private void download(String url, File file, DownLoadListener listener) {
            OKHttpUtils.getInstance().download(url, file, listener);
        }
    
        /** * 安装apk * * @param file */ private void installApk(File file) {
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            intent.addCategory("android.intent.category.DEFAULT");
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
            startActivity(intent);
            android.os.Process.killProcess(android.os.Process.myPid());
        }
    }

布局文件：

**activity\_main.xml**

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.bwie.com.myapplication.MainActivity">
    
        <Button android:id="@+id/btn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="检测版本更新"
            />
    
        <ProgressBar android:id="@+id/progressBar"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/btn"
            android:layout_marginTop="45dp"
            android:max="100"
            android:visibility="gone"
            android:progress="0"
            />
        <TextView android:id="@+id/tv_pro"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="0%"
            android:layout_below="@+id/progressBar"
            android:layout_centerHorizontal="true"
            android:visibility="gone"
            />
    
    
    </RelativeLayout>

[Android]: http://lib.csdn.net/base/android