1. First, we set the Dialog layout file, Download Dialog.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp"
android:textStyle="bold"
android:textColor="@color/colorPrimary"
android:text="Version update"/>
<ProgressBar
android:id="@+id/mProgressBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:max="100"/>
<TextView
android:id="@+id/mTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:textStyle="bold"
android:textSize="16sp"
android:textColor="@color/colorPrimary"
android:text="0%"/>
</LinearLayout>
2,
The progress bar shows the download progress, and TextView shows the download percentage.
Then customize an AlertDialog, set the layout file in, DownloadDialog.java:
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);
//Set dialog box style
setStyle();
//Initialize control
initView();
}
private void initView() {
view = View.inflate(mContext,R.layout.dwonlaod_dialog,null);
mTextView = (TextView)view.findViewById(R.id.mTextView);
mProgressBar = (ProgressBar)view.findViewById(R.id.mProgressBar);
setContentView(view);
}
private void setStyle() {
//Settings dialog cannot be cancelled
this.setCancelable(false);
//Set the touch dialog outside cannot be cancelled
this.setCanceledOnTouchOutside(false);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindow().getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
//Get application window size
WindowManager.LayoutParams layoutParams = this.getWindow().getAttributes();
//Set dialog Center
layoutParams.gravity = Gravity.CENTER;
//Set the dialog width to 3 / 5 of the screen
layoutParams.width = (displaymetrics.widthPixels/5)*3;
}
//Set progress bar
public void setProgress(int progress){
mTextView.setText(progress+"%");
mProgressBar.setProgress(progress);
}
}
3. Create a display dialog box and cancel the dialog box, MainActivity:
private void showDialog() {
if(downloadDialog==null){
downloadDialog = new DownloadDialog(this);
}
if(!downloadDialog.isShowing()){
downloadDialog.show();
}
}
4. Create a download method to download the application:
private void download() {
showDialog();
//It's better to use single thread pool or intentService
new Thread(new DownLoadRunnable(this,url, handler)).start();
}
5. Specific handling methods in DownloadRunnable:
public class DownLoadRunnable implements Runnable {
private String url;
private Handler handler;
private Context mContext;
public DownLoadRunnable(Context context, String url, Handler handler) {
this.mContext = context;
this.url = url;
this.handler = handler;
}
@Override
public void run() {
//Set the thread priority as the background, so that when multiple threads are concurrent, the CPU time allocated by many irrelevant threads will be reduced, which is conducive to the processing of the main thread.
Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
//Specific download method
startDownload();
}
private long startDownload() {
//Get DownloadManager object
DownloadManager downloadManager=(DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
//Obtain the download id, which is the unique id when the download task is generated. You can obtain the download information through this id
long requestId= downloadManager.enqueue(CreateRequest(url));
//Query download information method
queryDownloadProgress(requestId,downloadManager);
return requestId;
}
private void queryDownloadProgress(long requestId, DownloadManager downloadManager) {
DownloadManager.Query query=new DownloadManager.Query();
//Query download task information according to task id
query.setFilterById(requestId);
try {
boolean isGoging=true;
while (isGoging) {
Cursor cursor = downloadManager.query(query);
if (cursor != null && cursor.moveToFirst()) {
//Get download status
int state = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
switch (state) {
case DownloadManager.STATUS_SUCCESSFUL://Download successful
isGoging=false;
handler.obtainMessage(downloadManager.STATUS_SUCCESSFUL).sendToTarget();//Send to main thread, update ui
break;
case DownloadManager.STATUS_FAILED://Download failed
isGoging=false;
handler.obtainMessage(downloadManager.STATUS_FAILED).sendToTarget();//Send to main thread, update ui
break;
case DownloadManager.STATUS_RUNNING://Download
/**
* Calculate download rate;
*/
int totalSize = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
int currentSize = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
int progress = (int) (((float) currentSize) / ((float) totalSize) * 100);
handler.obtainMessage(downloadManager.STATUS_RUNNING, progress).sendToTarget();//Send to main thread, update ui
break;
case DownloadManager.STATUS_PAUSED://Download stop
handler.obtainMessage(DownloadManager.STATUS_PAUSED).sendToTarget();
break;
case DownloadManager.STATUS_PENDING://Ready to download
handler.obtainMessage(DownloadManager.STATUS_PENDING).sendToTarget();
break;
}
}
if(cursor!=null){
cursor.close();
}
}
}catch (Exception e){
e.printStackTrace();
}
}
private DownloadManager.Request CreateRequest(String url) {
DownloadManager.Request request=new DownloadManager.Request(Uri.parse(url));
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);// Hide notification
request.setAllowedNetworkTypes(request.NETWORK_WIFI);//Set the download network environment to wifi
request.setDestinationInExternalFilesDir(mContext, Environment.DIRECTORY_DOWNLOADS,"MyApp.app");//Specify the apk cache path, which is the Download folder in SD card by default
return request;
}
}
6. In the main thread, get Message through Handler, call handleMessage method to process information, update UI, MainActivity.java:
Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what){
case DownloadManager.STATUS_SUCCESSFUL:
downloadDialog.setProgress(100);
canceledDialog();
Toast.makeText(MainActivity.this, "Download task completed!", Toast.LENGTH_SHORT).show();
break;
case DownloadManager.STATUS_RUNNING:
//int progress = (int) msg.obj;
downloadDialog.setProgress((int) msg.obj);
//canceledDialog();
break;
case DownloadManager.STATUS_FAILED:
canceledDialog();
break;
case DownloadManager.STATUS_PENDING:
showDialog();
break;
}
}
};
7. After the download is completed, install (register the broadcast receiver statically to realize the installation function) AndroidManifest.xml:
<receiver
android:name=".InstallApkBroadcast">
<intent-filter>
<action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
<action android:name="android.intent.action.DOWNLOAD_NOTIFICATION_CLICKED"/>
</intent-filter>
</receiver>
8. Accept the broadcast and install the application by yourself, InstallApkBroadcast.java:
public class InstallApkBroadcast extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
install(context);
}
private void install(Context context) {
Intent installintent = new Intent();
installintent.setAction(Intent.ACTION_VIEW);
// To start an activity in Boradcast, you need to add intent.flag? Activity? New? Task
installintent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// installintent.setDataAndType(
// Uri.fromFile(new File(Environment.getExternalStorageDirectory()
// + "/vc.apk")),
// "Application / vnd. Android. Package archive"; / / the storage location is Android/data / package name / file/Download folder
installintent.setDataAndType(
Uri.fromFile(new File(context.getExternalFilesDir(
Environment.DIRECTORY_DOWNLOADS).getAbsolutePath()
+ "/vc.apk")),
"application/vnd.android.package-archive");
context.startActivity(installintent);
}
}9. Authority:
<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
Reference resources: