要在Android上實(shí)現(xiàn)類(lèi)似于FileZilla的多線(xiàn)程下載,你需要遵循以下步驟:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
ion
或OkHttp
。在app的build.gradle文件中添加以下依賴(lài):implementation 'com.koushikdutta.ion:ion:3.1.0'
implementation 'com.squareup.okhttp3:okhttp:4.9.1'
public class DownloadService extends Service {
private ExecutorService executorService;
@Override
public void onCreate() {
super.onCreate();
executorService = Executors.newFixedThreadPool(5); // 創(chuàng)建一個(gè)包含5個(gè)線(xiàn)程的線(xiàn)程池
}
// 添加一個(gè)方法來(lái)添加下載任務(wù)
public void addDownloadTask(String url, String destinationPath) {
DownloadTask task = new DownloadTask(url, destinationPath);
executorService.execute(task);
}
// 下載任務(wù)類(lèi)
private class DownloadTask implements Runnable {
private String url;
private String destinationPath;
public DownloadTask(String url, String destinationPath) {
this.url = url;
this.destinationPath = destinationPath;
}
@Override
public void run() {
// 在這里實(shí)現(xiàn)下載邏輯
}
}
}
OkHttp
或其他網(wǎng)絡(luò)庫(kù)來(lái)處理HTTP請(qǐng)求。例如:private class DownloadTask implements Runnable {
// ...
@Override
public void run() {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url(url).build();
try (Response response = client.newCall(request).execute()) {
if (!response.isSuccessful()) {
// 處理錯(cuò)誤
return;
}
File destinationFile = new File(destinationPath);
if (!destinationFile.getParentFile().exists()) {
destinationFile.getParentFile().mkdirs();
}
try (InputStream inputStream = response.body().byteStream();
OutputStream outputStream = new FileOutputStream(destinationFile)) {
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, length);
}
}
} catch (IOException e) {
// 處理錯(cuò)誤
}
}
}
public class MainActivity extends AppCompatActivity {
private DownloadService downloadService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent(this, DownloadService.class);
startService(intent);
bindService(intent, connection, Context.BIND_AUTO_CREATE);
}
private ServiceConnection connection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
DownloadService.LocalBinder binder = (DownloadService.LocalBinder) service;
downloadService = binder.getService();
}
@Override
public void onServiceDisconnected(ComponentName name) {
downloadService = null;
}
};
// 添加一個(gè)方法來(lái)開(kāi)始下載
public void startDownload(String url, String destinationPath) {
if (downloadService != null) {
downloadService.addDownloadTask(url, destinationPath);
}
}
}
startDownload()
方法來(lái)開(kāi)始下載:String url = "https://example.com/file.zip";
String destinationPath = Environment.getExternalStorageDirectory() + "/Download/file.zip";
startDownload(url, destinationPath);
這樣,你就可以在Android上實(shí)現(xiàn)類(lèi)似于FileZilla的多線(xiàn)程下載功能了。注意,這只是一個(gè)簡(jiǎn)單的示例,你可能需要根據(jù)你的需求進(jìn)行調(diào)整和優(yōu)化。