我正在尝试使用this tutorial使用Dropbox API将Dropbox与Android应用程序集成。我的代码编译得很好，没有错误。但是当我尝试从Dropbox下载文件时，我只收到一个空文件。对我来说，似乎它不与Dropbox交互。你能看看我的代码吗？我发布了所有文件。非常感谢你。
APP：我的申请
MainActivity.java文件：
package com.tutorialspoint.myapplication;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.dropbox.client2.DropboxAPI;
import com.dropbox.client2.ProgressListener;
import com.dropbox.client2.android.AndroidAuthSession;
import com.dropbox.client2.session.AppKeyPair;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
public class MainActivity extends ActionBarActivity {
public static Button button1;
public static Button button2;
public static Button button3;
public static Button button4;
public static TextView textView;
public static String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/AAA_DB_Tutorials/" ;
public static File Dir = new File(path);
public void onClickBut1(View v)
{
UploadToDropboxFromPath(path + "testfile.txt", "db_tutorial/uploadFileFromPath.txt");
}
public void onClickBut2(View v)
{
UploadToDropboxFromSelectedApp("db_tutorial/UploadFilesFromSelectedApp");
}
public void onClickBut3(View v)
{
UploadToDropboxFromFilemanager(path + "testfile.txt");
}
public void onClickBut4(View v)
{
DownloadFromDropboxFromPath(path + "downloadFileFromDrobboxkkk","db_tutorial/uploadFileFromPath.txt" );
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button)findViewById(R.id.button1);
button2 = (Button)findViewById(R.id.button2);
button3 = (Button)findViewById(R.id.button3);
button4 = (Button)findViewById(R.id.button4);
textView = (TextView)findViewById(R.id.textView);
AndroidAuthSession session = buildSession();
dropboxAPI = new DropboxAPI<AndroidAuthSession>(session);
Dir.mkdir();
}
static DropboxAPI<AndroidAuthSession> dropboxAPI;
private static final String APP_KEY = "xxxxxx";
private static final String APP_SECRET = "xxxx";
private static final String ACCESSTOKEN = "xxxxxx";
private DropboxAPI.UploadRequest request;
private AndroidAuthSession buildSession()
{
AppKeyPair appKeyPair = new AppKeyPair(APP_KEY, APP_SECRET);
AndroidAuthSession session = new AndroidAuthSession(appKeyPair);
session.setOAuth2AccessToken(ACCESSTOKEN);
return session;
}
static final int UploadFromSelectApp = 9501;
static final int UploadFromFilemanager = 9502;
public static String DropboxUploadPathFrom = "";
public static String DropboxUploadName = "";
public static String DropboxDownloadPathFrom = "";
public static String DropboxDownloadPathTo = "";
private void UploadToDropboxFromPath (String uploadPathFrom, String uploadPathTo)
{
Toast.makeText(getApplicationContext(), "Upload file ...", Toast.LENGTH_SHORT).show();
final String uploadPathF = uploadPathFrom;
final String uploadPathT = uploadPathTo;
Thread th = new Thread(new Runnable()
{
public void run()
{
File tmpFile = null;
try
{
tmpFile = new File(uploadPathF);
}
catch (Exception e) {e.printStackTrace();}
FileInputStream fis = null;
try
{
fis = new FileInputStream(tmpFile);
}
catch (FileNotFoundException e) {e.printStackTrace();}
try
{
dropboxAPI.putFileOverwrite(uploadPathT, fis, tmpFile.length(), null);
}
catch (Exception e) {}
getMain().runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), "File successfully uploaded.", Toast.LENGTH_SHORT).show();
}
});
}
});
th.start();
}
private void UploadToDropboxFromSelectedApp (String uploadName)
{
DropboxUploadName = uploadName;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
startActivityForResult(Intent.createChooser(intent, "Upload from ..."), UploadFromSelectApp);
}
private void UploadToDropboxFromFilemanager (String uploadName)
{
DropboxUploadName = uploadName;
Intent intent = new Intent("com.sec.android.app.myfiles.PICK_DATA");
intent.putExtra("CONTENT_TYPE", "*/*");
intent.addCategory(Intent.CATEGORY_DEFAULT);
startActivityForResult(intent, UploadFromFilemanager);
}
private void DownloadFromDropboxFromPath (String downloadPathTo, String downloadPathFrom)
{
DropboxDownloadPathTo = downloadPathTo;
DropboxDownloadPathFrom = downloadPathFrom;
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), "Download file ...", Toast.LENGTH_SHORT).show();
Thread th = new Thread(new Runnable() {
public void run() {
File file = new File(DropboxDownloadPathTo + DropboxDownloadPathFrom.substring(DropboxDownloadPathFrom.lastIndexOf('.')));
if (file.exists()) file.delete();
try {
FileOutputStream outputStream = new FileOutputStream(file);
MainActivity.dropboxAPI.getFile(DropboxDownloadPathFrom, null, outputStream, null);
getMain().runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), "File successfully downloaded.", Toast.LENGTH_SHORT).show();
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
});
th.start();
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent)
{
if (requestCode == UploadFromFilemanager)
{
final Uri currFileURI = intent.getData();
final String pathFrom = currFileURI.getPath();
Toast.makeText(getApplicationContext(), "Upload file ...", Toast.LENGTH_SHORT).show();
Thread th = new Thread(new Runnable()
{
public void run()
{
getMain().runOnUiThread(new Runnable()
{
@Override
public void run()
{
UploadToDropboxFromPath(pathFrom, "/db-test/" + DropboxUploadName + pathFrom.substring(pathFrom.lastIndexOf('.')));
Toast.makeText(getApplicationContext(), "File successfully uploaded.", Toast.LENGTH_SHORT).show();
}
});
}
});
th.start();
}
if (requestCode == UploadFromSelectApp)
{
Toast.makeText(getApplicationContext(), "Upload file ...", Toast.LENGTH_SHORT).show();
final Uri uri = intent.getData();
DropboxUploadPathFrom = getPath(getApplicationContext(), uri);
if(DropboxUploadPathFrom == null) {
DropboxUploadPathFrom = uri.getPath();
}
Thread th = new Thread(new Runnable(){
public void run() {
try
{
final File file = new File(DropboxUploadPathFrom);
InputStream inputStream = getContentResolver().openInputStream(uri);
dropboxAPI.putFile("/db-test/" + DropboxUploadName + file.getName().substring(file.getName().lastIndexOf("."),
file.getName().length()), inputStream, file.length(), null, new ProgressListener(){
@Override
public long progressInterval() {return 100;}
@Override
public void onProgress(long arg0, long arg1){}
});
getMain().runOnUiThread(new Runnable()
{
@Override
public void run()
{
Toast.makeText(getApplicationContext(), "File successfully uploaded.", Toast.LENGTH_SHORT).show();
}
});
} catch (Exception e) {e.printStackTrace();}
}
});
th.start();
}
super.onActivityResult(requestCode, resultCode, intent);
}
public String getPath(Context context, Uri contentUri) {
Cursor cursor = null;
try {
String[] proj = { MediaStore.Images.Media.DATA, MediaStore.Video.Media.DATA, MediaStore.Audio.Media.DATA };
cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String s = cursor.getString(column_index);
if(s!=null) {
cursor.close();
return s;
}
}
catch(Exception e){}
try {
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA);
cursor.moveToFirst();
String s = cursor.getString(column_index);
if(s!=null) {
cursor.close();
return s;
}
}
catch(Exception e){}
try {
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
cursor.moveToFirst();
String s = cursor.getString(column_index);
cursor.close();
return s;
}
finally {
if (cursor != null) {
cursor.close();
}
}
}
public MainActivity getMain()
{
return this;
}
}
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.tutorialspoint.myapplication.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hellppppppo World!"
android:id="@+id/textView"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="UPLOAD WITH FIXED PATH"
android:id="@+id/button1"
android:layout_below="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="onClickBut1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="UPLOAD FROM SELECTED APP"
android:id="@+id/button2"
android:layout_below="@+id/button1"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="onClickBut2"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="UPLOAD FROM FILE MANAGER"
android:id="@+id/button3"
android:layout_below="@+id/button2"
android:layout_alignRight="@+id/button2"
android:layout_alignEnd="@+id/button2"
android:onClick="onClickBut3"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="DOWNLOAD"
android:id="@+id/button4"
android:layout_below="@+id/button3"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="onClickBut4"/>
</RelativeLayout>
build.gradle文件
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
defaultConfig {
applicationId "com.tutorialspoint.myapplication"
minSdkVersion 16
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
compile files ('libs/json_simple-1.1.jar')
compile files ('libs/dropbox-android-sdk-1.6.3.jar')
}
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tutorialspoint.myapplication">
<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" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
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>
</application>
</manifest>