1 下載功能

//下載apk
    private void downloadApk(String apkUrl) throws PackageManager.NameNotFoundException {

        Uri uri = Uri.parse(apkUrl);
        DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        DownloadManager.Request request = new DownloadManager.Request(uri);
        // 設置允許使用的網絡類型，這里是移動網絡和wifi都可以
        request.setAllowedNetworkTypes(request.NETWORK_MOBILE | request.NETWORK_WIFI);
        //設置是否允許漫游
        request.setAllowedOverRoaming(true);
        //設置文件類型
        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
        String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(apkUrl));
        request.setMimeType(mimeString);
        //在通知欄中顯示
        request.setNotificationVisibility(request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setTitle("download...");
        request.setVisibleInDownloadsUi(true);
        //sdcard目錄下的download文件夾
        request.setDestinationInExternalPublicDir("/download", "SanjuScanApp_Android.apk");
        // 將下載請求放入隊列
        downloadManager.enqueue(request);
    }

2 設置接收廣播

public class InstallReceiver extends BroadcastReceiver {

    // 安裝下載接收器
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
            installApk(context);
        }
    }

    // 安裝Apk
    private void installApk(Context context) {

        try {
            Intent i = new Intent(Intent.ACTION_VIEW);
            String filePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/download/SanjuScanApp_Android.apk";
            i.setDataAndType(Uri.parse("file://" + filePath), "application/vnd.android.package-archive");
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(i);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

3 注冊廣播（AndroidManifest.xml的receiver節點）

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.tyler.myapplication">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application>
        <activity
            android:name=".LoginActivity"
        </activity>
        
        <receiver
            android:name="com.example.tyler.HelperTool.InstallReceiver">
            <intent-filter>
                <action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
            </intent-filter>
        </receiver>
    </application>

總結

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