通過okhttp3下載檔案實現APP版本更新
阿新 • • 發佈：2019-01-08
概況
思路是這樣的,首先在伺服器上把已經簽名打包的apk放上去,還有一份TXT檔案，檔案上寫著相關的版本號，然後客戶端通過對比版本號決定是否下載檔案。下載後就開啟安裝介面安裝。
第一步
把已經簽名打包apk和txt檔案放上到伺服器上，版本號要和txt檔案上的描述一致。Android Studio的版本號除了在manifests上，寫上code和name(code是面向開發者，name就是使用者所看到的版本號），那麼我要更新的是2.0版本，那麼我應該寫2.0，並且要把訪問網路和寫入資料許可權寫上
還要在build.gradle(Module:app）上更改版本號，如果是用eclipse開發就不需要這一步
TXT檔案的內容如下，第一行是版本號，第二行版本描述，第三行是apk的下載連結
第二步
伺服器端已經完成，接下來是程式碼的實現。
我這裡採用okhttp3+mvp模式實現下載檔案，如果有對這種模式不清楚的可以看在MVP模式下使用OkHttp3和初試OkHttp3實現登入功能
Model層有更新版本描述例項UpdateInfo和Okhttp3的get和post方法
首先在Presenter上有查詢版本號和下載apk這兩個方法，這兩個都是使用Get請求
在View上就需要有一個對應一個觸發更新的按鈕，顯示最新版本的Toast,顯示並詢問是否更新的Dialog,和顯示進度的ProgressDialog，一個跳轉到安裝介面的操作
Model層
- 首先要有updateInfo,一個版本資訊的例項
public class UpdateInfo
{
private String version;
private String description;
private String url;
public String getVersion()
{
return version;
}
public void setVersion(String version)
{
this - 另一個是Modle，包裝著okhttp3的post和get方法，這裡只需要get請求
/**
* get請求
* @param address
* @param callback
*/
public void get(String address, okhttp3.Callback callback)
{
OkHttpClient client = new OkHttpClient();
FormBody.Builder builder = new FormBody.Builder();
FormBody body = builder.build();
Request request = new Request.Builder()
.url(address)
.build();
client.newCall(request).enqueue(callback);
}Presenter層
- 檢查是否需要更新
public void updateAPK() {
model = Model.getInstance();
model.get("TXT檔案的url",new okhttp3.Callback(){
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
String responseBody = response.body().string();
StringBuffer sb = new StringBuffer();
BufferedReader reader = null;
UpdateInfo updateInfo = new UpdateInfo();
Log.d("版本", "onResponse: "+responseBody);
reader = new BufferedReader(new StringReader(responseBody));
updateInfo.setVersion(reader.readLine());//把版本資訊讀出來
updateInfo.setDescription(reader.readLine());
updateInfo.setUrl(reader.readLine());
String new_version = updateInfo.getVersion();
Log.d("版本", "onResponse: "+updateInfo.getVersion());
Log.d("版本描述", "onResponse: "+updateInfo.getDescription());
Log.d("更新連結", "onResponse: "+updateInfo.getUrl());
String now_version = "";
try {
PackageManager packageManager = context.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(),0);
now_version = packageInfo.versionName;//獲取原版本號
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
if(new_version.equals(now_version)){
view.showError("");
Log.d("版本號是", "onResponse: "+now_version);
}else{
view.showUpdateDialog(updateInfo);
}
}
});
}- 下載apk
public void downFile(final String url) {
Log.d("SettingPresenter", "downFile: ");
model = Model.getInstance();
model.get(url,new okhttp3.Callback(){
@Override
public void onFailure(Call call, IOException e) {
view.downFial();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
InputStream is = null;//輸入流
FileOutputStream fos = null;//輸出流
try {
is = response.body().byteStream();//獲取輸入流
long total = response.body().contentLength();//獲取檔案大小
view.setMax(total);//為progressDialog設定大小
if(is != null){
Log.d("SettingPresenter", "onResponse: 不為空");
File file = new File(Environment.getExternalStorageDirectory(),"Earn.apk");// 設定路徑
fos = new FileOutputStream(file);
byte[] buf = new byte[1024];
int ch = -1;
int process = 0;
while ((ch = is.read(buf)) != -1) {
fos.write(buf, 0, ch);
process += ch;
view.downLoading(process); //這裡就是關鍵的實時更新進度了！
}
}
fos.flush();
// 下載完成
if(fos != null){
fos.close();
}
view.downSuccess();
} catch (Exception e) {
view.downFial();
Log.d("SettingPresenter",e.toString());
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
}
try {
if (fos != null)
fos.close();
} catch (IOException e) {
}
}
}
//private void down() {
// progressDialog.cancel();
// }
});
}View層
這一層注意的東西很多，例如Android6.0以上等需要在這裡設定一下許可權，還有Dialog注意關閉，否則出現視窗洩露問題。話不多說，直接上程式碼
public class MainActivity extends AppCompatActivity {
//下載進度
private ProgressDialog progressDialog;
private Button button;
private SettingPresenter presenter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
presenter = new SettingPresenter(this,this);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (Build.VERSION.SDK_INT >= 23) {//如果是6.0以上的
int REQUEST_CODE_CONTACT = 101;
String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
//驗證是否許可許可權
for (String str : permissions) {
if (MainActivity.this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {
//申請許可權
MainActivity.this.requestPermissions(permissions, REQUEST_CODE_CONTACT);
return;
}
}
}
presenter.updateAPK();
}
});
}
//顯示更新錯誤
public void showError(final String msg) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
}
});
}
//顯示進度條
public void showUpdateDialog(final UpdateInfo updateInfo) {
runOnUiThread(new Runnable() {
@Override
public void run() {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setTitle("請升級APP至版本" + updateInfo.getVersion());
builder.setMessage(updateInfo.getDescription());
builder.setCancelable(false);
builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
downFile(updateInfo.getUrl());
} else {
Toast.makeText(MainActivity.this,"SD卡不可用，請插入SD卡",Toast.LENGTH_LONG).show();
}
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
builder.create().show();
}
});
}
//下載apk操作
public void downFile(final String url) {
progressDialog = new ProgressDialog(MainActivity.this); //進度條，在下載的時候實時更新進度，提高使用者友好度
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setTitle("正在下載");
progressDialog.setMessage("請稍候...");
progressDialog.setProgress(0);
progressDialog.show();
presenter.downFile(url);
Log.d("SettingActivity", "downFile: ");
}
/**
* 進度條實時更新
* @param i
*/
public void downLoading(final int i) {
runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog.setProgress(i);
}
});
}
/**
* 下載成功
*/
public void downSuccess() {
runOnUiThread(new Runnable() {
@Override
public void run() {
if (progressDialog != null && progressDialog.isShowing())
{
progressDialog.dismiss();
}
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setTitle("下載完成");
builder.setMessage("是否安裝");
builder.setCancelable(false);
builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Intent.ACTION_VIEW);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { //aandroid N的許可權問題
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
Uri contentUri = FileProvider.getUriForFile(MainActivity.this, "對應的包名.fileprovider", new File(Environment.getExternalStorageDirectory(), "軟體名.apk"));//注意修改
intent.setDataAndType(contentUri, "application/vnd.android.package-archive");
} else {
intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "軟體名.apk")), "application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
}
startActivity(intent);
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
builder.create().show();
}
});
}
/**
* 下載失敗
*/
public void downFial() {
runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog.cancel();
Toast.makeText(MainActivity.this,"更新失敗",Toast.LENGTH_LONG).show();
}
});
}
public void setMax(final long total) {
runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog.setMax((int) total);
}
});
}
}注意：在跳轉到安裝介面時，android 6.0即android N以上的需要設定許可權。
- 首先在Manifests加上
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="對應的包名.fileprovider"
android:grantUriPermissions="true"
android:exported="false"
>
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>- 然後在res中建立xml包，存放file_paths.xml檔案
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path path="Android/data/com.earn/" name="files_root" />
<external-path path="." name="external_storage_root" />
</paths>- 文章所用Demo這裡下載