Android 应用下载示例 清单文件 ```xml package="com.example.myapp"> android:name=".App" android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/Theme.MyApp"> ``` 主活动（MainActivity.j影音a） ```j视频a package com.example.myapp; import android.annotation.SuppressLint; import android.app.DownloadManager; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private EditText urlEditText; private Button downloadButton; private Button cancelButton; private long downloadId; private boolean isDownloading; @Override protected void onCreate(Bundle s多媒体edInstanceState) { super.onCreate(s影音edInstanceState); setContentView(R.layout.activity_main); urlEditText = findViewById(R.id.url_edit_text); downloadButton = findViewById(R.id.download_button); cancelButton = findViewById(R.id.cancel_button); // Register a broadcast receiver to listen for download completion IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE); registerReceiver(downloadCompleteReceiver, filter); downloadButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { downloadFile(urlEditText.getText().toString()); } }); cancelButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { cancelDownload(); } }); } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(downloadCompleteReceiver); } // Request the download of a file @SuppressLint("NewApi") private void downloadFile(String url) { if (isDownloading) { Toast.makeText(getApplicationContext(), "Download already in progress", Toast.LENGTH_SHORT).show(); return; } DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url)); // Set the destination for the downloaded file request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "my_downloaded_file.apk"); // Enqueue the download request and s多媒体e the download ID downloadId = downloadManager.enqueue(request); isDownloading = true; Toast.makeText(getApplicationContext(), "Download started", Toast.LENGTH_SHORT).show(); } // Cancel the current download if it is in progress private void cancelDownload() { if (!isDownloading) { Toast.makeText(getApplicationContext(), "No download in progress", Toast.LENGTH_SHORT).show(); return; } DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); downloadManager.remove(downloadId); isDownloading = false; Toast.makeText(getApplicationContext(), "Download cancelled", Toast.LENGTH_SHORT).show(); } // Broadcast receiver to listen for download completion private BroadcastReceiver downloadCompleteReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) { long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1); if (id == downloadId) { isDownloading = false; // Get the downloaded file path DownloadManager downloadManager = (DownloadManager) context.getSystemService(DOWNLOAD_SERVICE); Uri downloadedFileUri = downloadManager.getUriForDownloadedFile(downloadId); // Open the downloaded file in an appropriate app Intent openFileIntent = new Intent(Intent.ACTION_VIEW); openFileIntent.setDataAndType(downloadedFileUri, "application/vnd.android.package-archive"); openFileIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); startActivity(openFileIntent); } } } }; } ``` 使用指南 在 `AndroidManifest.xml` 中添加必要的权限和配置。 在 `MainActivity` 中添加一个 `EditText` 控件用于获取要下载的文件的 URL，以及两个按钮用于启动和取消下载。 4. 实现 `downloadFile()` 方法以请求文件下载。 5. 实现 `cancelDownload()` 方法以取消正在进行的下载。 运行 导入项目并运行它。 输入要下载的文件的 URL。 单击“下载”按钮开始下载。 4. 单击“取消”按钮取消下载（可选）。内容审核流程驱动动态加速平台风险防控自动化测试平台安全编排渗透防御执行手册