安装包更新

效果图，下载完成会跳转到安装页面

download_dialog.xml

DownloadDialog

public class DownloadDialog extends AlertDialog {    private Context mContext;    private TextView mTextView;    private ProgressBar mProgressBar;    private View view;    protected DownloadDialog(Context context) {        super(context);        this.mContext = context;    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //设置对话框样式        setStyle();        //初始化控件        initView();    }    private void initView() {        view = View.inflate(mContext,R.layout.download_dialog,null);        mTextView = (TextView)view.findViewById(R.id.mTextView);        mProgressBar = (ProgressBar)view.findViewById(R.id.mProgressBar);        setContentView(view);    }    private void setStyle() {        //设置对话框不可取消        this.setCancelable(false);        //设置触摸对话框外面不可取消        this.setCanceledOnTouchOutside(false);        DisplayMetrics displaymetrics = new DisplayMetrics();        getWindow().getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);        //获得应用窗口大小        WindowManager.LayoutParams layoutParams = this.getWindow().getAttributes();        //设置对话框居中显示        layoutParams.gravity = Gravity.CENTER;        //设置对话框宽度为屏幕的3/5        layoutParams.width = (displaymetrics.widthPixels/3)*2;    }    //设置进度条    public void setProgress(int progress){        mTextView.setText(progress+"%");        mProgressBar.setMax(100);        mProgressBar.setProgress(progress);    }}

在AndroidManifest.xml中配置

                                        .....

res/xml下配置filepaths.xml

当前类

public class DownloadActivity extends BaseActivity {    private DownloadManager downloadManager;    private DownloadDialog downloadDialog;    String qqUrl = "http://fga0.market.xiaomi.com/download/AppStore/0e02a48306458ddc088caf86d628b6a6866402771";    Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            switch (msg.what){                case DownloadManager.STATUS_SUCCESSFUL:                    downloadDialog.setProgress(100);                    canceledDialog();                    Toast.makeText(DownloadActivity.this, "下载任务已经完成！", Toast.LENGTH_SHORT).show();                    //调用，apkPath 入参就是 xml 中共享的路径                    String apkPath = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)+File.separator+ "myApp.apk";                    //AppUpdate.installApk(DownloadActivity.this,apkPath );                    Log.d("+++++++apkPath=",apkPath+"");                    File apkFile = new File(apkPath);                    Log.d("+++++++apkFile=",apkFile+"");                /*Uri contentUri = FileProvider.getUriForFile(DownloadActivity.this,"com.xiang.mylianlianshou2.fileprovider",apkFile);                 Log.d("+++++++contentUri=",contentUri+"");*/                    //Android 7.0 系统共享文件需要通过 FileProvider 添加临时权限否则系统会抛出 FileUriExposedException .                    Intent intent = new Intent(Intent.ACTION_VIEW);                    //Android 7.0 系统共享文件需要通过 FileProvider 添加临时权限，否则系统会抛出 FileUriExposedException .                    if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.N){                        intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);                        Uri contentUri = FileProvider.getUriForFile(DownloadActivity.this,"com.xiang.mylianlianshou2.fileprovider",apkFile);                        Log.d("+++++++contentUri=",contentUri+"");                        intent.setDataAndType(contentUri,"application/vnd.android.package-archive");                    }else {                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                        intent.setDataAndType(                                Uri.fromFile(apkFile),                                "application/vnd.android.package-archive");                    }                    startActivity(intent);                    break;                case DownloadManager.STATUS_RUNNING://下载中                    //int progress = (int) msg.obj;                    downloadDialog.setProgress((int) msg.obj);                    //canceledDialog();                    break;                case DownloadManager.STATUS_FAILED:                    canceledDialog();                    break;                case DownloadManager.STATUS_PENDING:                    showDialog();                    break;            }        }    };    @Override    protected void initComponents() {        setContentView(R.layout.activity_download);        downLoadApk();    }    @Override    protected void initData() {            }    private void showDialog() {        if(downloadDialog==null){            downloadDialog = new DownloadDialog(this);        }        if(!downloadDialog.isShowing()){            downloadDialog.show();        }    }    private void canceledDialog() {        if(downloadDialog!=null&&downloadDialog.isShowing()){            downloadDialog.dismiss();        }    }    private void downLoadApk() {//创建request对象        DownloadManager.Request request=new DownloadManager.Request(Uri.parse(qqUrl));        //设置什么网络情况下可以下载  DownloadManager.Request.NETWORK_WIFI        request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE);        //设置通知栏的标题        request.setTitle("下载");        //设置通知栏的message        request.setDescription("今日头条正在下载.....");        //设置漫游状态下是否可以下载        request.setAllowedOverRoaming(false);        //设置文件存放目录        request.setDestinationInExternalFilesDir(this, Environment.DIRECTORY_DOWNLOADS,"/myApp.apk");        //获取系统服务        downloadManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);        //进行下载        final long requestId = downloadManager.enqueue(request);        //downloadManager.remove(id);//删除下载        new Thread(){            @Override            public void run() {                super.run();                setXiaZaiDeJianTing(requestId);            }        }.start();    }    private void setXiaZaiDeJianTing(long requestId) {        DownloadManager.Query query=new DownloadManager.Query();        //根据任务编号id查询下载任务信息        query.setFilterById(requestId);        try {            boolean isGoging=true;            while (isGoging) {                Cursor cursor = downloadManager.query(query);                if (cursor != null && cursor.moveToFirst()) {                    //获得下载状态                    int state = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));                    switch (state) {                        case DownloadManager.STATUS_SUCCESSFUL://下载成功                            isGoging=false;                            handler.sendEmptyMessage(downloadManager.STATUS_SUCCESSFUL);//发送到主线程，更新ui                            break;                        case DownloadManager.STATUS_FAILED://下载失败                            isGoging=false;                            handler.sendEmptyMessage(downloadManager.STATUS_FAILED);//发送到主线程，更新ui                            break;                        case DownloadManager.STATUS_RUNNING://下载中                            /*                             * 计算下载下载率；*/                           /* COLUMN_TOTAL_SIZE_BYTES  总大小字节*/                            int totalSize = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));                            /*COLUMN_BYTES_DOWNLOADED_SO_FAR  字节下载到目前为止*/                            int currentSize = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));                            int progress = (int) (((float) currentSize) / ((float) totalSize) * 100);                                                        Message message = new Message();                            message.what=downloadManager.STATUS_RUNNING;                            message.obj=progress;                            handler.sendMessageAtFrontOfQueue(message);//发送到主线程，更新ui                            break;                        case DownloadManager.STATUS_PAUSED://下载停止                                                        handler.sendEmptyMessage(DownloadManager.STATUS_PAUSED);                            break;                        case DownloadManager.STATUS_PENDING://准备下载                                                        handler.sendEmptyMessage(DownloadManager.STATUS_PENDING);                            break;                    }                }                if(cursor!=null){                    cursor.close();                }            }        }catch (Exception e){            e.printStackTrace();        }    }}

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