android中activity可以响应外部的action的例子(可以用这个来导入外部文件)
浏览数：63 /
时间：2015年06月11日
如果我们在文件浏览器中点击一个文件，然后点击它，会弹出一个列表给你选择
如果使自己的应用也出现在这个列表上，必须在menifest的这个activity下加入：
<activity
android:name="com.example.clickabletextview.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<action android:name="android.intent.action.EDIT" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:mimeType="application/pdf" />
<data android:mimeType="image/bmp" />
<data android:mimeType="image/tiff" />
<data android:mimeType="image/gif" />
<data android:mimeType="image/jpeg" />
<data android:mimeType="image/x-ms-bmp" />
<data android:mimeType="image/png" />
<data android:mimeType="image/x-pcx" />
<data android:mimeType="image/targa" />
<data android:mimeType="image/x-photoshop" />
<data android:mimeType="text/plain" />
<data android:mimeType="text/xml" />
<data android:mimeType="text/html" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<data
android:host="*"
android:mimeType="*/*"
android:pathPattern=".*\\.pdf"
android:scheme="file" />
<data
android:host="*"
android:mimeType="*/*"
android:pathPattern=".*\\.jpg"
android:scheme="file" />
<data
android:host="*"
android:mimeType="*/*"
android:pathPattern=".*\\.bmp"
android:scheme="file" />
<data
android:host="*"
android:mimeType="*/*"
android:pathPattern=".*\\.png"
android:scheme="file" />
<data
android:host="*"
android:mimeType="*/*"
android:pathPattern=".*\\.txt"
android:scheme="file" />
</intent-filter>
</activity>然后在activity的oncreate上接收这个intent:
Intent intent = this.getIntent();
int flags = intent.getFlags();
if ((flags & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) == 0) {
if (intent.getAction() != null && Intent.ACTION_VIEW.equals(intent.getAction())) {
if (SCHEME_FILE.equals(intent.getScheme()) || SCHEME_CONTENT.equals(intent.getScheme())) {
String i_type = getIntent().getType();
// mImportingUri=file:///storage/emulated/0/Vlog.xml
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
mImportingUri = intent.getData();
System.out.println("====mImportingUri=" + mImportingUri);
InputStream is = null;
try {
is = getContentResolver().openInputStream(mImportingUri);
} catch (Exception e) {
System.out.println("====e="+e);
}
if (mImportingUri != null && SCHEME_FILE.equalsIgnoreCase(mImportingUri.getScheme())) {
//Is file
startToCopyFile(is);
}else if(mImportingUri != null && SCHEME_CONTENT.equalsIgnoreCase(mImportingUri.getScheme())){
startCopyMedia(is);
}
}
}
}这里如果发现要导入的文件是media的格式
private boolean startCopyMedia(InputStream is) {
Cursor c = null;
try {
c = getContentResolver().query(mImportingUri,
new String[] {MediaStore.MediaColumns.DISPLAY_NAME, MediaStore.MediaColumns.SIZE},
null, null, null);
if (c != null && c.moveToFirst()) {
int dn_index = c.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME);
fromFileName = c.getString(dn_index);
int s_index = c.getColumnIndexOrThrow(MediaStore.MediaColumns.SIZE);
fromFileSize = c.getLong(s_index);
}
} catch (Exception e) {
System.out.println("===query e="+e);
}
return true;
}如果发现要导入的文件是txt格式,则我们在sd卡下建立一个tmp的文件夹，把这个文件拷贝进去:
public static void makesureFileExist(String path) {
String separator = File.separator;
int index = path.lastIndexOf(separator);
path = path.substring(0, index);
File f = new File(path);
f.mkdirs();
File f1 = new File(path);
try {
f1.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
public static String getSDPath(){
File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState()
.equals(android.os.Environment.MEDIA_MOUNTED); //判断sd卡是否存在
if(sdCardExist)
{
sdDir = Environment.getExternalStorageDirectory();//获取跟目录
}
if(sdDir!=null){
return sdDir.toString();
}else
return null;
}
private String getName(Uri uri) {
String str = uri.toString();
int index = str.lastIndexOf(File.separator);
String name = str.substring(index,str.length());
return name;
}
private boolean startToCopyFile(InputStream is) {
String fileName = getSDPath()+tmpPath+File.separator+getName(mImportingUri);
makesureFileExist(fileName);
File toFile = new File(fileName);
CopyThread mCopyThread = new CopyThread(is, toFile);
new Thread(mCopyThread).start();
return true;
}
private class CopyThread implements Runnable {
private File toFile;
private InputStream fosfrom = null;
public CopyThread(InputStream fosfrom, File toFile) {
this.fosfrom = fosfrom;
this.toFile = toFile;
}
@Override
public void run() {
try {
TimeUnit.MILLISECONDS.sleep(800);
FileInputStream fosfrom = null;
if (this.fosfrom != null) {
fosfrom = (FileInputStream) this.fosfrom;
}
FileOutputStream fosto = new FileOutputStream(toFile);
byte bt[] = new byte[1024];
int c;
int time = 0;
while ((c = fosfrom.read(bt)) > 0) {
fosto.write(bt, 0, c);
}
if (fosfrom != null) {
fosfrom.close();
}
fosto.close();
} catch (Exception e) {
return;
} finally {
try {
if (this.fosfrom != null) {
this.fosfrom.close();
}
} catch (IOException e) {
}
}
}
}
代码:http://download.csdn.net/detail/baidu_nod/7712765
郑重声明：本站内容如果来自互联网及其他传播媒体，其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享，并不代表本站赞同其观点和对其真实性负责，也不构成任何其他建议。
