我想从google驱动器下载文件，我使用compile 'com.google.android.gms:play-services:8.4.0'依赖关系，并使用此功能我可以从下面的示例中获取元数据的链接。
mFileId = (DriveId) data.getParcelableExtra(
OpenFileActivityBuilder.EXTRA_RESPONSE_DRIVE_ID);
final DriveFile file = Drive.DriveApi.getFile(mGoogleApiClient, mFileId);
new Thread(new Runnable() {
@Override
public void run() {
// DO your work here
DriveResource.MetadataResult mdRslt = file.getMetadata(mGoogleApiClient).await();
if (mdRslt != null && mdRslt.getStatus().isSuccess()) {
String link = mdRslt.getMetadata().getWebContentLink();
String name=mdRslt.getMetadata().getTitle();
Log.d("LINK", link);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && getApplication().checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
{
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
else
{
new get_download_data(link,name).execute();
}
}
}
}).start();
}
从Google云端硬盘获取链接后，我正在调用异步任务从链接下载该文件。所以我的问题是当我下载文件时，它没有打开。检查和调试后，我发现我的文件没有正确下载。
例如，我的文件名为abc.pdf，大小为400kb。我在我的SD卡上下载但abc.pdf仅为56 kb。我使用下面的代码下载。我不知道我做错了什么。请帮忙。谢谢。
public class get_download_data extends AsyncTask<Void,Void,String>
{
File apkStorage = null;
File outputFile = null;
String link1="";
String name1="";
public get_database_data(String link, String name) {
this.link1=link;
this.name1=name;
}
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(Void... params) {
try {
URL url = new URL(link1);//Create Download URl
HttpURLConnection c = (HttpURLConnection) url.openConnection();//Open Url Connection
c.setRequestMethod("GET");//Set Request Method to "GET" since we are grtting data
c.setDoInput(true);
c.connect();//connect the URL Connection
//If Connection response is not OK then show Logs
if (c.getResponseCode() != HttpURLConnection.HTTP_OK) {
Log.e(TAG, "Server returned HTTP " + c.getResponseCode()
+ " " + c.getResponseMessage());
}else{
Log.e(TAG, "Server returned HTTP " + c.getResponseCode()
+ " " + c.getResponseMessage());
}
//Get File if SD card is present
if (new CheckForSDCard().isSDCardPresent()) {
apkStorage = new File(
Environment.getExternalStorageDirectory() + "/"
+ "checkdb");
} else
Toast.makeText(getApplication(), "Oops!! There is no SD Card.", Toast.LENGTH_SHORT).show();
//If File is not present create directory
if (!apkStorage.exists()) {
apkStorage.mkdir();
Log.e(TAG, "Directory Created.");
}
outputFile = new File(apkStorage, name1);//Create Output file in Main File
//Create New File if not present
if (!outputFile.exists()) {
outputFile.createNewFile();
Log.e(TAG, "File Created");
}
OutputStream fos = new FileOutputStream(outputFile);//Get OutputStream for NewFile Location
InputStream is = c.getInputStream();//Get InputStream for connection
BufferedInputStream inStream = new BufferedInputStream(is, 1024);
byte[] buffer = new byte[1024];//Set buffer type
int len1 = 0;//init length
while ((len1 = inStream.read(buffer)) != -1) {
fos.write(buffer, 0, len1);//Write new file
}
//Close all connection after doing task
fos.flush();
fos.close();
is.close();
} catch (Exception e) {
//Read exception if something went wrong
e.printStackTrace();
outputFile = null;
Log.e(TAG, "Download Error Exception " + e.getMessage());
}
return null;
}
@Override
protected void onPostExecute(String result_1) {
super.onPostExecute(result_1);
String downlodepath = Environment.getExternalStorageState()+"/"+name1;
Log.e("Sdpath",""+imagePath);
Toast.makeText(getApplication(), "download"+downlodepath, Toast.LENGTH_SHORT).show();
}
}
我找到了这个链接here，但有些我怎么也不知道如何实现这个。请让我知道我哪里错了。感谢。
答案 0 :(得分：5)
经过一番努力并尝试了很多例子后，我找到了答案。 以下是我在项目中添加的依赖项：
compile 'com.google.android.gms:play-services-auth:11.8.0'
compile 'com.google.android.gms:play-services-drive:11.8.0'
这是我的清单文件：
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="false"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_api_key" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
</manifest>
这是我的MainActivity：
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ActivityMainBinding binding;
private static final String TAG = "Google drive";
private static final String SIGN_IN = "Sign In";
private static final String DOWNLOAD_FILE = "Download file";
private static final int REQUEST_CODE_SIGN_IN = 0;
private static final int REQUEST_CODE_OPEN_ITEM = 1;
private static final int REQUEST_WRITE_STORAGE = 112;
private GoogleSignInAccount signInAccount;
private Set<Scope> requiredScopes;
private DriveClient mDriveClient;
private DriveResourceClient mDriveResourceClient;
private OpenFileActivityOptions openOptions;
private TaskCompletionSource<DriveId> mOpenItemTaskSource;
private File storageDir;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
initialize();
requestPermission();
signInAccount = GoogleSignIn.getLastSignedInAccount(this);
binding.btnSubmit.setOnClickListener(this);
if (signInAccount != null && signInAccount.getGrantedScopes().containsAll(requiredScopes)) {
initializeDriveClient(signInAccount);
binding.btnSubmit.setText(DOWNLOAD_FILE);
} else {
binding.btnSubmit.setText(SIGN_IN);
}
}
private void showMessage(String message) {
Toast.makeText(this, message, Toast.LENGTH_LONG).show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case REQUEST_CODE_SIGN_IN:
if (resultCode == RESULT_OK) {
Task<GoogleSignInAccount> getAccountTask = GoogleSignIn.getSignedInAccountFromIntent(data);
if (getAccountTask.isSuccessful()) {
initializeDriveClient(getAccountTask.getResult());
showMessage("Sign in successfully.");
binding.btnSubmit.setText(DOWNLOAD_FILE);
} else {
showMessage("Sign in failed.");
}
} else {
showMessage("Sign in failed.");
}
break;
case REQUEST_CODE_OPEN_ITEM:
if (resultCode == RESULT_OK) {
DriveId driveId = data.getParcelableExtra(OpenFileActivityOptions.EXTRA_RESPONSE_DRIVE_ID);
mOpenItemTaskSource.setResult(driveId);
} else {
mOpenItemTaskSource.setException(new RuntimeException("Unable to open file"));
}
break;
}
}
private void initialize() {
requiredScopes = new HashSet<>(2);
requiredScopes.add(Drive.SCOPE_FILE);
requiredScopes.add(Drive.SCOPE_APPFOLDER);
openOptions = new OpenFileActivityOptions.Builder()
.setSelectionFilter(Filters.eq(SearchableField.MIME_TYPE, "application/pdf"))
.setActivityTitle("Select file")
.build();
}
private void initializeDriveClient(GoogleSignInAccount signInAccount) {
mDriveClient = Drive.getDriveClient(getApplicationContext(), signInAccount);
mDriveResourceClient = Drive.getDriveResourceClient(getApplicationContext(), signInAccount);
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.btnSubmit) {
String text = (String) ((Button) view).getText();
if (text.equals(SIGN_IN)) {
signIn();
} else {
onDriveClientReady();
}
}
}
private void signIn() {
GoogleSignInOptions signInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestScopes(Drive.SCOPE_FILE)
.requestScopes(Drive.SCOPE_APPFOLDER)
.build();
GoogleSignInClient googleSignInClient = GoogleSignIn.getClient(this, signInOptions);
startActivityForResult(googleSignInClient.getSignInIntent(), REQUEST_CODE_SIGN_IN);
}
private void onDriveClientReady() {
mOpenItemTaskSource = new TaskCompletionSource<>();
mDriveClient.newOpenFileActivityIntentSender(openOptions)
.continueWith(new Continuation<IntentSender, Void>() {
@Override
public Void then(@NonNull Task<IntentSender> task) throws Exception {
startIntentSenderForResult(
task.getResult(), REQUEST_CODE_OPEN_ITEM, null, 0, 0, 0);
return null;
}
});
Task<DriveId> tasks = mOpenItemTaskSource.getTask();
tasks.addOnSuccessListener(this,
new OnSuccessListener<DriveId>() {
@Override
public void onSuccess(DriveId driveId) {
retrieveContents(driveId.asDriveFile());
}
})
.addOnFailureListener(this, new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
showMessage("File not selected.");
}
});
}
private void retrieveContents(final DriveFile file) {
// [START open_file]
final Task<DriveContents> openFileTask = mDriveResourceClient.openFile(file, DriveFile.MODE_READ_ONLY);
// [END open_file]
// [START read_contents]
openFileTask.continueWithTask(new Continuation<DriveContents, Task<Void>>() {
@Override
public Task<Void> then(@NonNull Task<DriveContents> task) throws Exception {
DriveContents contents = task.getResult();
Log.v(TAG, "File name : " + contents.toString());
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
InputStream input = contents.getInputStream();
try {
File file = new File(getExternalFilesDir(null), "umesh.pdf");
Log.v(TAG, storageDir + "");
OutputStream output = new FileOutputStream(file);
try {
try {
byte[] buffer = new byte[4 * 1024]; // or other buffer size
int read;
while ((read = input.read(buffer)) != -1) {
output.write(buffer, 0, read);
}
output.flush();
} finally {
output.close();
}
} catch (Exception e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
showMessage("Download file successfully.");
return mDriveResourceClient.discardContents(contents);
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
showMessage("Unable to download file.");
}
});
// [END read_contents]
}
private void requestPermission() {
String dirPath = getFilesDir().getAbsolutePath() + File.separator + "PDF";
storageDir = new File(dirPath);
if (!storageDir.exists())
storageDir.mkdirs();}}
这是API密钥的字符串文件：
<resources>
<string name="app_name">GoogleDriveDemo</string>
<string name="google_api_key">"your-key"</string>
</resources>
答案 1 :(得分：0)
在Drive API中下载文件时使用webContentLink的方法是在Javascript中打开一个新的浏览器窗口。
var webcontentlink = 'https://docs.google.com/a/google.com/uc?id='+fileId+'&export=download'
window.open( webcontentlink);
我建议您在Android中执行此操作，如post中提到的那样：
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(webcontentlink));
startActivity(browserIntent);
答案 2 :(得分：0)
对于仍然陷在此问题中的人。
在driveResourceClient.createFile()
driveResourceClient?.createFile(appFolder, metadataChangeSet, contents)
}?.addOnSuccessListener(this
) { driverFile -> //we cannot get webContentLink here }
目前，我们只能获取文件名（可能已经定义了该文件名）
对于我来说，上传后我并不需要URL，而是当用户单击复制URL按钮时
driveResourceClient?.query(Query.Builder()
.addFilter(Filters.eq(SearchableField.TITLE, sharedFileName))
.build())
?.addOnSuccessListener {
url = it.first().webContentLink
}
?.{
}
我已经成功了。
答案 3 :(得分：0)
您可以使用chrome自定义标签轻松地做到这一点，只需将网址粘贴到自定义标签中，它将显示驱动器网站，并且可以下载文件 请参阅此官方文档以获取chrome自定义标签https://developer.chrome.com/multidevice/android/customtabs，这是一项非常出色的功能，也是Webview的最佳替代方法