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  • 在应用中更新App版本

    在应用中, 为了提高用户体验, 会提供更新版本的功能. 那么如何实现呢? 我写了一个简单的Demo, 说明一下, 需要注意几个细节. 使用了Retrofit和Rx处理网络请求.

    Github下载地址

    更新

    1. 逻辑

    访问服务器, 根据是否包含新版本, 判断是否需要更新.

    下载Apk, 下载完成后, 自动安装, 高版本会覆盖低版本.

    逻辑:

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    public class MainActivity extends AppCompatActivity {
     
        private static final String APP_NAME = "Ped_android";
        private static final String VERSION = "1.0.0";
        private static final String INFO_NAME = "计步器";
        private static final String STORE_APK = "chunyu_apk";
     
        @Bind(R.id.main_b_install_apk) Button mBInstallApk;
     
        private UpdateAppUtils.UpdateCallback mUpdateCallback; // 更新回调
     
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            ButterKnife.bind(this);
     
            mUpdateCallback = new UpdateAppUtils.UpdateCallback() {
                @Override public void onSuccess(UpdateInfo updateInfo) {
                    Toast.makeText(MainActivity.this, "有更新", Toast.LENGTH_SHORT).show();
                    UpdateAppUtils.downloadApk(MainActivity.this, updateInfo, INFO_NAME, STORE_APK);
                }
     
                @Override public void onError() {
                    Toast.makeText(MainActivity.this, "无更新", Toast.LENGTH_SHORT).show();
                }
            };
     
            mBInstallApk.setOnClickListener(new View.OnClickListener() {
                @Override public void onClick(View v) {
                    UpdateAppUtils.checkUpdate(APP_NAME, VERSION, mUpdateCallback);
                }
            });
        }
    }

    UpdateAppUtils是核心下载类. 输入App的代号, 版本号, 异步回调, 发送到服务器, 判断是否需要更新. 如果存在新版本, 则下载Apk, 并自动安装更新.

    2. 网络请求

    更新请求, 参数是App代号和当前版本号.

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    /**
     * 更新服务
     * <p>
     * Created by wangchenlong on 16/1/4.
     */
    public interface UpdateService {
        String ENDPOINT = "http://www.chunyuyisheng.com";
     
        // 获取个人信息
        @GET("/cmsapi/app/update")
        Observable&lt;UpdateInfo&gt; getUpdateInfo(
                @Query("appName") String appName,
                @Query("version") String version);
    }

    创建服务的工厂类.

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    /**
     * 创建Retrofit服务
     * <p>
     * Created by wangchenlong on 16/1/4.
     */
    public class ServiceFactory {
        public static &lt;T&gt; T createServiceFrom(final Class&lt;T&gt; serviceClass, String endpoint) {
            Retrofit adapter = new Retrofit.Builder()
                    .baseUrl(endpoint)
                    .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) // 添加Rx适配器
                    .addConverterFactory(GsonConverterFactory.create()) // 添加Gson转换器
                    .build();
            return adapter.create(serviceClass);
        }
    }

    更新信息的Json类.

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    /**
     * 更新信息(JSON)
     * <p>
     * Created by wangchenlong on 16/1/4.
     */
    public class UpdateInfo {
        public Data data; // 信息
        public Integer error_code; // 错误代码
        public String error_msg; // 错误信息
     
        public static class Data {
            public String curVersion; // 当前版本
            public String appURL; // 下载地址
            public String description; // 描述
            public String minVersion; // 最低版本
            public String appName; // 应用名称
        }
     
        @Override public String toString() {
            return "当前版本: " + data.curVersion + ", 下载地址: " + data.appURL + ", 描述信息: " + data.description
                    + ", 最低版本: " + data.minVersion + ", 应用代称: " + data.appName
                    + ", 错误代码: " + error_code + ", 错误信息: " + error_msg;
        }
    }

    3. 请求和下载

    更新库的主类, 包含检查更新(checkUpdate)和下载Apk(downloadApk)两个重要方法.

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    /**
     * 更新管理器
     * <p>
     * Created by wangchenlong on 16/1/6.
     */
    @SuppressWarnings("unused")
    public class UpdateAppUtils {
     
        @SuppressWarnings("unused")
        private static final String TAG = "DEBUG-WCL: " + UpdateAppUtils.class.getSimpleName();
     
        /**
         * 检查更新
         */
        @SuppressWarnings("unused")
        public static void checkUpdate(String appCode, String curVersion, UpdateCallback updateCallback) {
            UpdateService updateService =
                    ServiceFactory.createServiceFrom(UpdateService.class, UpdateService.ENDPOINT);
     
            updateService.getUpdateInfo(appCode, curVersion)
                    .subscribeOn(Schedulers.newThread())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(updateInfo -&gt; onNext(updateInfo, updateCallback),
                            throwable -&gt; onError(throwable, updateCallback));
        }
     
        // 显示信息
        private static void onNext(UpdateInfo updateInfo, UpdateCallback updateCallback) {
            Log.e(TAG, "返回数据: " + updateInfo.toString());
            if (updateInfo.error_code != 0 || updateInfo.data == null ||
                    updateInfo.data.appURL == null) {
                updateCallback.onError(); // 失败
            } else {
                updateCallback.onSuccess(updateInfo);
            }
        }
     
        // 错误信息
        private static void onError(Throwable throwable, UpdateCallback updateCallback) {
            updateCallback.onError();
        }
     
        /**
         * 下载Apk, 并设置Apk地址,
         * 默认位置: /storage/sdcard0/Download
         *
         * @param context    上下文
         * @param updateInfo 更新信息
         * @param infoName   通知名称
         * @param storeApk   存储的Apk
         */
        @SuppressWarnings("unused")
        public static void downloadApk(
                Context context, UpdateInfo updateInfo,
                String infoName, String storeApk
        ) {
            if (!isDownloadManagerAvailable()) {
                return;
            }
     
            String description = updateInfo.data.description;
            String appUrl = updateInfo.data.appURL;
     
            if (appUrl == null || appUrl.isEmpty()) {
                Log.e(TAG, "请填写"App下载地址"");
                return;
            }
     
            appUrl = appUrl.trim(); // 去掉首尾空格
     
            if (!appUrl.startsWith("http")) {
                appUrl = "http://" + appUrl; // 添加Http信息
            }
     
            Log.e(TAG, "appUrl: " + appUrl);
     
            DownloadManager.Request request;
            try {
                request = new DownloadManager.Request(Uri.parse(appUrl));
            } catch (Exception e) {
                e.printStackTrace();
                return;
            }
            request.setTitle(infoName);
            request.setDescription(description);
            if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB) {
                request.allowScanningByMediaScanner();
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            }
            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, storeApk);
     
            Context appContext = context.getApplicationContext();
            DownloadManager manager = (DownloadManager)
                    appContext.getSystemService(Context.DOWNLOAD_SERVICE);
     
            // 存储下载Key
            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(appContext);
            sp.edit().putLong(PrefsConsts.DOWNLOAD_APK_ID_PREFS, manager.enqueue(request)).apply();
        }
     
        // 最小版本号大于9
        private static boolean isDownloadManagerAvailable() {
            return Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.GINGERBREAD;
        }
     
        // 错误回调
        public interface UpdateCallback {
            void onSuccess(UpdateInfo updateInfo);
     
            void onError();
        }
    }

    检查更新: 创建服务, 在新线程中发送请求, 在主线程中接收数据, 判断成功和失败.

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    /**
      * 检查更新
      */
     @SuppressWarnings("unused")
     public static void checkUpdate(String appCode, String curVersion, UpdateCallback updateCallback) {
         UpdateService updateService =
                 ServiceFactory.createServiceFrom(UpdateService.class, UpdateService.ENDPOINT);
     
         updateService.getUpdateInfo(appCode, curVersion)
                 .subscribeOn(Schedulers.newThread())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(updateInfo -&gt; onNext(updateInfo, updateCallback),
                         throwable -&gt; onError(throwable, updateCallback));
     }

    下载Apk: 转换和解析Url, 设置通知信息和存储位置, 存储下载Id, 自动安装更新.

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    /**
     * 下载Apk, 并设置Apk地址,
     * 默认位置: /storage/sdcard0/Download
     *
     * @param context    上下文
     * @param updateInfo 更新信息
     * @param infoName   通知名称
     * @param storeApk   存储的Apk
     */
    @SuppressWarnings("unused")
    public static void downloadApk(
            Context context, UpdateInfo updateInfo,
            String infoName, String storeApk
    ) {
        if (!isDownloadManagerAvailable()) {
            return;
        }
     
        String description = updateInfo.data.description;
        String appUrl = updateInfo.data.appURL;
     
        if (appUrl == null || appUrl.isEmpty()) {
            Log.e(TAG, "请填写"App下载地址"");
            return;
        }
     
        appUrl = appUrl.trim(); // 去掉首尾空格
     
        if (!appUrl.startsWith("http")) {
            appUrl = "http://" + appUrl; // 添加Http信息
        }
     
        Log.e(TAG, "appUrl: " + appUrl);
     
        DownloadManager.Request request;
        try {
            request = new DownloadManager.Request(Uri.parse(appUrl));
        } catch (Exception e) {
            e.printStackTrace();
            return;
        }
        request.setTitle(infoName);
        request.setDescription(description);
        if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB) {
            request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        }
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, storeApk);
     
        Context appContext = context.getApplicationContext();
        DownloadManager manager = (DownloadManager)
                appContext.getSystemService(Context.DOWNLOAD_SERVICE);
     
        // 存储下载Key
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(appContext);
        sp.edit().putLong(PrefsConsts.DOWNLOAD_APK_ID_PREFS, manager.enqueue(request)).apply();
    }

    使用DownloadManager下载文件是Android的推荐方式.
    存储下载Id(manager.enqueue(request))是为了在安装应用时, 找到Apk.
    默认存储地址/storage/sdcard0/Download.

    4.自动安装

    注册广播接收器, 接收消息ACTION_DOWNLOAD_COMPLETE, 下载完成会发送广播. 获取下载文件的Uri, 进行匹配, 发送安装消息, 自动安装.

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    /**
     * 安装下载接收器
     * <p>
     * Created by wangchenlong on 16/1/5.
     */
    public class InstallReceiver extends BroadcastReceiver {
     
        private static final String TAG =
                "DEBUG-WCL: " + InstallReceiver.class.getSimpleName();
     
        // 安装下载接收器
        @Override public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
                long downloadApkId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
                installApk(context, downloadApkId);
            }
        }
     
        // 安装Apk
        private void installApk(Context context, long downloadApkId) {
            // 获取存储ID
            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
            long id = sp.getLong(PrefsConsts.DOWNLOAD_APK_ID_PREFS, -1L);
     
            if (downloadApkId == id) {
                DownloadManager dManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
                Intent install = new Intent(Intent.ACTION_VIEW);
                Uri downloadFileUri = dManager.getUriForDownloadedFile(downloadApkId);
                if (downloadFileUri != null) {
                    install.setDataAndType(downloadFileUri, "application/vnd.android.package-archive");
                    install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    context.startActivity(install);
                } else {
                    Log.e(TAG, "下载失败");
                }
            }
        }
    }

    安装本应用下载的Apk, 不安装其他Apk, 存储下载Id, 与广播Id进行匹配.
    下载失败, 也会发送下载完成(ACTION_DOWNLOAD_COMPLETE)广播, Uri可能为空, 需要判断, 否则发生崩溃.

    在应用中, 为了提高用户体验, 会提供更新版本的功能. 那么如何实现呢? 我写了一个简单的Demo, 说明一下, 需要注意几个细节. 使用了Retrofit和Rx处理网络请求.

    Github下载地址

    更新

    1. 逻辑

    访问服务器, 根据是否包含新版本, 判断是否需要更新.

    下载Apk, 下载完成后, 自动安装, 高版本会覆盖低版本.

    逻辑:

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    public class MainActivity extends AppCompatActivity {
     
        private static final String APP_NAME = "Ped_android";
        private static final String VERSION = "1.0.0";
        private static final String INFO_NAME = "计步器";
        private static final String STORE_APK = "chunyu_apk";
     
        @Bind(R.id.main_b_install_apk) Button mBInstallApk;
     
        private UpdateAppUtils.UpdateCallback mUpdateCallback; // 更新回调
     
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            ButterKnife.bind(this);
     
            mUpdateCallback = new UpdateAppUtils.UpdateCallback() {
                @Override public void onSuccess(UpdateInfo updateInfo) {
                    Toast.makeText(MainActivity.this, "有更新", Toast.LENGTH_SHORT).show();
                    UpdateAppUtils.downloadApk(MainActivity.this, updateInfo, INFO_NAME, STORE_APK);
                }
     
                @Override public void onError() {
                    Toast.makeText(MainActivity.this, "无更新", Toast.LENGTH_SHORT).show();
                }
            };
     
            mBInstallApk.setOnClickListener(new View.OnClickListener() {
                @Override public void onClick(View v) {
                    UpdateAppUtils.checkUpdate(APP_NAME, VERSION, mUpdateCallback);
                }
            });
        }
    }

    UpdateAppUtils是核心下载类. 输入App的代号, 版本号, 异步回调, 发送到服务器, 判断是否需要更新. 如果存在新版本, 则下载Apk, 并自动安装更新.

    2. 网络请求

    更新请求, 参数是App代号和当前版本号.

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    /**
     * 更新服务
     * <p>
     * Created by wangchenlong on 16/1/4.
     */
    public interface UpdateService {
        String ENDPOINT = "http://www.chunyuyisheng.com";
     
        // 获取个人信息
        @GET("/cmsapi/app/update")
        Observable&lt;UpdateInfo&gt; getUpdateInfo(
                @Query("appName") String appName,
                @Query("version") String version);
    }

    创建服务的工厂类.

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    /**
     * 创建Retrofit服务
     * <p>
     * Created by wangchenlong on 16/1/4.
     */
    public class ServiceFactory {
        public static &lt;T&gt; T createServiceFrom(final Class&lt;T&gt; serviceClass, String endpoint) {
            Retrofit adapter = new Retrofit.Builder()
                    .baseUrl(endpoint)
                    .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) // 添加Rx适配器
                    .addConverterFactory(GsonConverterFactory.create()) // 添加Gson转换器
                    .build();
            return adapter.create(serviceClass);
        }
    }

    更新信息的Json类.

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    /**
     * 更新信息(JSON)
     * <p>
     * Created by wangchenlong on 16/1/4.
     */
    public class UpdateInfo {
        public Data data; // 信息
        public Integer error_code; // 错误代码
        public String error_msg; // 错误信息
     
        public static class Data {
            public String curVersion; // 当前版本
            public String appURL; // 下载地址
            public String description; // 描述
            public String minVersion; // 最低版本
            public String appName; // 应用名称
        }
     
        @Override public String toString() {
            return "当前版本: " + data.curVersion + ", 下载地址: " + data.appURL + ", 描述信息: " + data.description
                    + ", 最低版本: " + data.minVersion + ", 应用代称: " + data.appName
                    + ", 错误代码: " + error_code + ", 错误信息: " + error_msg;
        }
    }

    3. 请求和下载

    更新库的主类, 包含检查更新(checkUpdate)和下载Apk(downloadApk)两个重要方法.

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    /**
     * 更新管理器
     * <p>
     * Created by wangchenlong on 16/1/6.
     */
    @SuppressWarnings("unused")
    public class UpdateAppUtils {
     
        @SuppressWarnings("unused")
        private static final String TAG = "DEBUG-WCL: " + UpdateAppUtils.class.getSimpleName();
     
        /**
         * 检查更新
         */
        @SuppressWarnings("unused")
        public static void checkUpdate(String appCode, String curVersion, UpdateCallback updateCallback) {
            UpdateService updateService =
                    ServiceFactory.createServiceFrom(UpdateService.class, UpdateService.ENDPOINT);
     
            updateService.getUpdateInfo(appCode, curVersion)
                    .subscribeOn(Schedulers.newThread())
                    .observeOn(AndroidSchedulers.mainThread())
                    .subscribe(updateInfo -&gt; onNext(updateInfo, updateCallback),
                            throwable -&gt; onError(throwable, updateCallback));
        }
     
        // 显示信息
        private static void onNext(UpdateInfo updateInfo, UpdateCallback updateCallback) {
            Log.e(TAG, "返回数据: " + updateInfo.toString());
            if (updateInfo.error_code != 0 || updateInfo.data == null ||
                    updateInfo.data.appURL == null) {
                updateCallback.onError(); // 失败
            } else {
                updateCallback.onSuccess(updateInfo);
            }
        }
     
        // 错误信息
        private static void onError(Throwable throwable, UpdateCallback updateCallback) {
            updateCallback.onError();
        }
     
        /**
         * 下载Apk, 并设置Apk地址,
         * 默认位置: /storage/sdcard0/Download
         *
         * @param context    上下文
         * @param updateInfo 更新信息
         * @param infoName   通知名称
         * @param storeApk   存储的Apk
         */
        @SuppressWarnings("unused")
        public static void downloadApk(
                Context context, UpdateInfo updateInfo,
                String infoName, String storeApk
        ) {
            if (!isDownloadManagerAvailable()) {
                return;
            }
     
            String description = updateInfo.data.description;
            String appUrl = updateInfo.data.appURL;
     
            if (appUrl == null || appUrl.isEmpty()) {
                Log.e(TAG, "请填写"App下载地址"");
                return;
            }
     
            appUrl = appUrl.trim(); // 去掉首尾空格
     
            if (!appUrl.startsWith("http")) {
                appUrl = "http://" + appUrl; // 添加Http信息
            }
     
            Log.e(TAG, "appUrl: " + appUrl);
     
            DownloadManager.Request request;
            try {
                request = new DownloadManager.Request(Uri.parse(appUrl));
            } catch (Exception e) {
                e.printStackTrace();
                return;
            }
            request.setTitle(infoName);
            request.setDescription(description);
            if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB) {
                request.allowScanningByMediaScanner();
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            }
            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, storeApk);
     
            Context appContext = context.getApplicationContext();
            DownloadManager manager = (DownloadManager)
                    appContext.getSystemService(Context.DOWNLOAD_SERVICE);
     
            // 存储下载Key
            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(appContext);
            sp.edit().putLong(PrefsConsts.DOWNLOAD_APK_ID_PREFS, manager.enqueue(request)).apply();
        }
     
        // 最小版本号大于9
        private static boolean isDownloadManagerAvailable() {
            return Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.GINGERBREAD;
        }
     
        // 错误回调
        public interface UpdateCallback {
            void onSuccess(UpdateInfo updateInfo);
     
            void onError();
        }
    }

    检查更新: 创建服务, 在新线程中发送请求, 在主线程中接收数据, 判断成功和失败.

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    /**
      * 检查更新
      */
     @SuppressWarnings("unused")
     public static void checkUpdate(String appCode, String curVersion, UpdateCallback updateCallback) {
         UpdateService updateService =
                 ServiceFactory.createServiceFrom(UpdateService.class, UpdateService.ENDPOINT);
     
         updateService.getUpdateInfo(appCode, curVersion)
                 .subscribeOn(Schedulers.newThread())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(updateInfo -&gt; onNext(updateInfo, updateCallback),
                         throwable -&gt; onError(throwable, updateCallback));
     }

    下载Apk: 转换和解析Url, 设置通知信息和存储位置, 存储下载Id, 自动安装更新.

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    /**
     * 下载Apk, 并设置Apk地址,
     * 默认位置: /storage/sdcard0/Download
     *
     * @param context    上下文
     * @param updateInfo 更新信息
     * @param infoName   通知名称
     * @param storeApk   存储的Apk
     */
    @SuppressWarnings("unused")
    public static void downloadApk(
            Context context, UpdateInfo updateInfo,
            String infoName, String storeApk
    ) {
        if (!isDownloadManagerAvailable()) {
            return;
        }
     
        String description = updateInfo.data.description;
        String appUrl = updateInfo.data.appURL;
     
        if (appUrl == null || appUrl.isEmpty()) {
            Log.e(TAG, "请填写"App下载地址"");
            return;
        }
     
        appUrl = appUrl.trim(); // 去掉首尾空格
     
        if (!appUrl.startsWith("http")) {
            appUrl = "http://" + appUrl; // 添加Http信息
        }
     
        Log.e(TAG, "appUrl: " + appUrl);
     
        DownloadManager.Request request;
        try {
            request = new DownloadManager.Request(Uri.parse(appUrl));
        } catch (Exception e) {
            e.printStackTrace();
            return;
        }
        request.setTitle(infoName);
        request.setDescription(description);
        if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB) {
            request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        }
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, storeApk);
     
        Context appContext = context.getApplicationContext();
        DownloadManager manager = (DownloadManager)
                appContext.getSystemService(Context.DOWNLOAD_SERVICE);
     
        // 存储下载Key
        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(appContext);
        sp.edit().putLong(PrefsConsts.DOWNLOAD_APK_ID_PREFS, manager.enqueue(request)).apply();
    }

    使用DownloadManager下载文件是Android的推荐方式.
    存储下载Id(manager.enqueue(request))是为了在安装应用时, 找到Apk.
    默认存储地址/storage/sdcard0/Download.

    4.自动安装

    注册广播接收器, 接收消息ACTION_DOWNLOAD_COMPLETE, 下载完成会发送广播. 获取下载文件的Uri, 进行匹配, 发送安装消息, 自动安装.

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    /**
     * 安装下载接收器
     * <p>
     * Created by wangchenlong on 16/1/5.
     */
    public class InstallReceiver extends BroadcastReceiver {
     
        private static final String TAG =
                "DEBUG-WCL: " + InstallReceiver.class.getSimpleName();
     
        // 安装下载接收器
        @Override public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
                long downloadApkId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
                installApk(context, downloadApkId);
            }
        }
     
        // 安装Apk
        private void installApk(Context context, long downloadApkId) {
            // 获取存储ID
            SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
            long id = sp.getLong(PrefsConsts.DOWNLOAD_APK_ID_PREFS, -1L);
     
            if (downloadApkId == id) {
                DownloadManager dManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
                Intent install = new Intent(Intent.ACTION_VIEW);
                Uri downloadFileUri = dManager.getUriForDownloadedFile(downloadApkId);
                if (downloadFileUri != null) {
                    install.setDataAndType(downloadFileUri, "application/vnd.android.package-archive");
                    install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    context.startActivity(install);
                } else {
                    Log.e(TAG, "下载失败");
                }
            }
        }
    }

    安装本应用下载的Apk, 不安装其他Apk, 存储下载Id, 与广播Id进行匹配.
    下载失败, 也会发送下载完成(ACTION_DOWNLOAD_COMPLETE)广播, Uri可能为空, 需要判断, 否则发生崩溃.
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  • 原文地址：https://www.cnblogs.com/qianyukun/p/5193501.html
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