Android本地Apk自动更新 （包含8.0等高版本和低版本）

参考博客： https://blog.csdn.net/qq_29405933/article/details/82862679

1.从服务器获取版本信息：
（可参考我上一篇博客：https://blog.csdn.net/qq_30297763/article/details/87875072）

	private void upapk(){
		OkGo.<String>get(UrlUtil.UPAPK)
				.tag(this)
				.execute(new StringCallback() {
					@Override
					public void onSuccess(Response<String> response) {
						UpdateBean updateBean = FastJsonUtils.getObject(response.body(),UpdateBean.class);
						versionCode = updateBean.getVersionCode();
						versionName = updateBean.getVersionName();
						versionUrl = updateBean.getApkurl();
						versionMessage = updateBean.getMessage();
						
						//判断是否更新
						if (updateJudge()){
							dialogUp();
						}else {
							//软件为最低版本
						}
					}
				});
	}

2.通过对比版本号判断是否更新：
（对比版本名称可参考我这篇博客：https://blog.csdn.net/qq_30297763/article/details/77884045）

	private boolean updateJudge(){
		PackageManager packageManager = getPackageManager();
		PackageInfo packInfo = null;
		try {
			packInfo = packageManager.getPackageInfo(getPackageName(),0);
		} catch (PackageManager.NameNotFoundException e) {
			e.printStackTrace();
		}
		if (Integer.parseInt(versionCode) > packInfo.versionCode ){
			return true;
		}else {
			return false;
		}
	}

3.如果版本有更新弹窗提示：
（因需要，使用户必须强制更新）

	/**
	 * 3.弹窗更新提示
	 */
	private void dialogUp(){
		AlertDialog.Builder alertDialogBuilder=new AlertDialog.Builder(this);
//		alertDialogBuilder.setIcon(R.drawable.)
		alertDialogBuilder.setTitle("版本更新");
		alertDialogBuilder.setMessage(versionMessage);
		alertDialogBuilder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {

				//更新应用提醒
				ProgressDialog progressDialog;
				progressDialog = new ProgressDialog(MainActivity.this);
				progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
				progressDialog.setMessage("软件更新中，请稍等~");
				progressDialog.setCancelable(true);
				progressDialog.show();

				getFile(); //下载apk
			}
		});

		alertDialogBuilder.setCancelable(false);
		AlertDialog alertDialog = alertDialogBuilder.create();
		alertDialog.show();//将dialog显示出来
	}

4.下载APK：

private void getFile(){

		String filePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/download";
		final String fileName = "dzjcy.apk";
		final File file = new File(filePath + "/" + fileName);
		if (file.exists()){
			file.delete();
		}
		OkGo.<File>get(versionUrl)
				.tag(this)
				.execute(new FileCallback(filePath, fileName) {
					@Override
					public void onStart(Request<File, ? extends Request> request) {
						super.onStart(request);
						Log.e("MainActivity", "开始下载" );
					}

					@Override
					public void onSuccess(Response<File> response) {
						Log.e("MainActivity", "file--" + file);
						openFile(file);  //安装apk
					}

					@Override
					public void onError(Response<File> response) {
						super.onError(response);
						Log.e("MainActivity", "onError: "+response.message());
					}

					@Override
					public void downloadProgress(Progress progress) {
						super.downloadProgress(progress);
						Log.e("MainActivity", "progress" + progress.fraction * 100);
					}
				});
	}

5.安装apk：

private void openFile(File file) {

		//Android 7.0及以上
		if (Build.VERSION.SDK_INT >= 24) {
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
                hasInstallPermission = this.getPackageManager().canRequestPackageInstalls();
                if (!hasInstallPermission) {
                    //请求安装未知应用来源的权限
                    ActivityCompat.requestPermissions((Activity) this, new String[]{Manifest.permission.REQUEST_INSTALL_PACKAGES}, 6666);
                }
            }
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
			Uri apkUri = FileProvider.getUriForFile(this, "com.dzjcy.provider", file);
			intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
			this.startActivity(intent);
		} else {
			Log.e("MainActivity", "小于24" );
			Intent intent = new Intent(Intent.ACTION_VIEW);
			intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
			this.startActivity(intent);
		}
	}

注：
7.0以上需要获取安装权限：

<uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />