App通過瀏覽器下載更新的實現方法

轉自：https://blog.csdn.net/wolfking0608/article/details/79619472

特別注意：  兩個更新前後的apk,必須保證簽名和包名完全一致，纔可以覆蓋安裝，否則安裝會失敗！！！

工具類代碼如下：

1.下載更新APK的工具

public class InstallUtils {


    //任務定時器
    private Timer mTimer;
    //定時任務
    private TimerTask mTask;
    //文件總大小
    private int fileLength = 1;
    //下載的文件大小
    private int fileCurrentLength;

    private Context context;
    private String httpUrl;
    private String savePath;
    private String saveName;
    private DownloadCallBack downloadCallBack;
    private static File saveFile;

    private boolean isComplete = false;


    public interface DownloadCallBack {
        void onStart();

        void onComplete(String path);

        void onLoading(long total, long current);

        void onFail(Exception e);
    }

    public interface InstallCallBack {

        void onSuccess();

        void onFail(Exception e);
    }

    public InstallUtils(Context context, String httpUrl, String saveName, DownloadCallBack downloadCallBack) {
        this.context = context;
        this.httpUrl = httpUrl;
        this.saveName = saveName;
        this.downloadCallBack = downloadCallBack;
        this.savePath = getCachePath(this.context);
    }


    public void downloadAPK() {
        if (TextUtils.isEmpty(httpUrl)) {
            return;
        }
        saveFile = new File(savePath);
        if (!saveFile.exists()) {
            boolean isMK = saveFile.mkdirs();
            if (!isMK) {
                //創建失敗
                return;
            }
        }

        saveFile = new File(savePath + File.separator + saveName + ".apk");

        if (downloadCallBack != null) {
            //下載開始
            downloadCallBack.onStart();
        }

        new Thread(new Runnable() {
            @Override
            public void run() {
                InputStream inputStream = null;
                FileOutputStream outputStream = null;
                HttpURLConnection connection = null;
                try {
                    URL url = new URL(httpUrl);
                    connection = (HttpURLConnection) url.openConnection();
                    connection.setConnectTimeout(10 * 1000);
                    connection.setReadTimeout(10 * 1000);
                    connection.connect();
                    inputStream = connection.getInputStream();
                    outputStream = new FileOutputStream(saveFile);
                    fileLength = connection.getContentLength();

                    //判斷fileLength大小
                    if (fileLength <= 0) {
                        //失敗的地址
                        ((Activity) context).runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                if (downloadCallBack != null) {
                                    downloadCallBack.onFail(new Exception("下載地址異常"));
                                    downloadCallBack = null;
                                }
                            }
                        });
                        return;
                    }

                    //計時器
                    initTimer();

                    byte[] buffer = new byte[1024];
                    int current = 0;
                    int len;
                    while ((len = inputStream.read(buffer)) > 0) {
                        outputStream.write(buffer, 0, len);
                        current += len;
                        if (fileLength > 0) {
                            fileCurrentLength = current;
                        }
                    }
                    isComplete = true;
                    //下載完成
                    ((Activity) context).runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            //解決某些低版本安裝失敗的問題
                            changeApkFileMode(saveFile);

                            if (downloadCallBack != null) {
                                downloadCallBack.onComplete(saveFile.getPath());
                                downloadCallBack = null;
                            }
                        }
                    });
                } catch (final Exception e) {
                    e.printStackTrace();
                    ((Activity) context).runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            if (downloadCallBack != null) {
                                downloadCallBack.onFail(e);
                                downloadCallBack = null;
                            }
                        }
                    });
                } finally {
                    try {
                        if (inputStream != null)
                            inputStream.close();
                        if (outputStream != null)
                            outputStream.close();
                        if (connection != null)
                            connection.disconnect();
                    } catch (IOException e) {
                    }
                    //銷燬Timer
                    destroyTimer();
                }
            }
        }).start();

    }

    private void initTimer() {
        mTimer = new Timer();
        mTask = new TimerTask() {//在run方法中執行定時的任務
            @Override
            public void run() {
                ((Activity) context).runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        if (downloadCallBack != null) {
                            if (!isComplete) {
                                downloadCallBack.onLoading(fileLength, fileCurrentLength);
                            }
                        }
                    }
                });
            }
        };
        //任務定時器一定要啓動
        mTimer.schedule(mTask, 0, 200);
    }


    private void destroyTimer() {
        if (mTimer != null && mTask != null) {
            mTask.cancel();
            mTimer.cancel();
            mTask = null;
            mTimer = null;
        }
    }

    /**
     * 安裝APK工具類
     *
     * @param context  上下文
     * @param filePath 文件路徑
     * @param callBack 安裝界面成功調起的回調
     */
    public static void installAPK(Context context, String filePath, InstallCallBack callBack) {
        try {
            Intent intent = new Intent();
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setAction(Intent.ACTION_VIEW);
            File apkFile = new File(filePath);
            Uri apkUri;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                String authority = context.getPackageName() + ".updateFileProvider";
                apkUri = FileProvider.getUriForFile(context, authority, apkFile);
                // 授予目錄臨時共享權限
                intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            } else {
                apkUri = Uri.fromFile(apkFile);
            }
            intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
            context.startActivity(intent);
            if (callBack != null) {
                callBack.onSuccess();
            }
            //關閉當前
            android.os.Process.killProcess(android.os.Process.myPid());
        } catch (Exception e) {
            if (callBack != null) {
                callBack.onFail(e);
            }
        }
    }

    /**
     * 通過瀏覽器下載APK更新安裝
     *
     * @param context    上下文
     * @param httpUrlApk APK下載地址
     */
    public static void installAPKWithBrower(Context context, String httpUrlApk) {
        Uri uri = Uri.parse(httpUrlApk);
        Intent viewIntent = new Intent(Intent.ACTION_VIEW, uri);
        context.startActivity(viewIntent);
    }


    /**
     * 獲取app緩存路徑    SDCard/Android/data/你的應用的包名/cache
     *
     * @param context
     * @return
     */
    public String getCachePath(Context context) {
        String cachePath;
        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                || !Environment.isExternalStorageRemovable()) {
            //外部存儲可用
            cachePath = context.getExternalCacheDir().getPath();
        } else {
            //外部存儲不可用
            cachePath = context.getCacheDir().getPath();
        }
        return cachePath;
    }

    //參照：APK放到data/data/下面提示解析失敗 (http://blog.csdn.net/lonely_fireworks/article/details/27693073)
    private void changeApkFileMode(File file) {
        try {
            //apk放在緩存目錄時，低版本安裝提示權限錯誤，需要對父級目錄和apk文件添加權限
            String cmd1 = "chmod 777 " + file.getParent();
            Runtime.getRuntime().exec(cmd1);

            String cmd = "chmod 777 " + file.getAbsolutePath();
            Runtime.getRuntime().exec(cmd);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


}

使用方式：

public static final String APK_URL = "http://static.portport.cn/tools/app/GangGang_release-1.0.apk";

public void download2(View view) {
       //通過瀏覽器去下載APK
       InstallUtils.installAPKWithBrower(this, APK_URL);
   }

自個去試試吧！挺好用的！希望能幫到現在正在做app升級的你！！！