我的freetype字体加载器指向哪里? [英] Where do I point my freetype font loader to?
问题描述
我已经成功地将字体放在apk的assets/文件夹中的apk上.我目前正在尝试获取Freetype库，以在文件夹中查看Arial.ttf，但找不到它.
APK结构:
apk/
AndroidManifest.xml
assets/
Arial.ttf
classes.dex
lib/
META-INF/
res/
resources.arsc
加载字体:
FT_Face face;
if (FT_New_Face(ft, "/assets/Arial.ttf", 0, &face)) // TODO: get font locally
__android_log_print(ANDROID_LOG_INFO, "SetupGlyphs", "ERROR::FREETYPE: Failed to load font.");
资产是开发机器上的文件.它们是设备上的 not 文件.它们是ZIP归档文件(即APK)中的条目.
在Java代码中(最有可能)，您需要将资产(从AssetManager)复制到文件系统上的本地文件，然后让本机代码使用该本地文件系统副本.
例如，此活动将PDF从资产复制到内部存储，以便能够使用FileProvider和第三方PDF查看器进行查看:
/***
Copyright (c) 2013 CommonsWare, LLC
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy
of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
by applicable law or agreed to in writing, software distributed under the
License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
OF ANY KIND, either express or implied. See the License for the specific
language governing permissions and limitations under the License.
From _The Busy Coder's Guide to Android Development_
https://commonsware.com/Android
*/
package com.commonsware.android.cp.v4file;
import android.app.Activity;
import android.content.Intent;
import android.content.res.AssetManager;
import android.os.Bundle;
import android.support.v4.content.FileProvider;
import android.util.Log;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class FilesCPDemo extends Activity {
private static final String AUTHORITY="com.commonsware.android.cp.v4file";
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
File f=new File(getFilesDir(), "test.pdf");
if (!f.exists()) {
AssetManager assets=getResources().getAssets();
try {
copy(assets.open("test.pdf"), f);
}
catch (IOException e) {
Log.e("FileProvider", "Exception copying from assets", e);
}
}
Intent i=
new Intent(Intent.ACTION_VIEW,
FileProvider.getUriForFile(this, AUTHORITY, f));
i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(i);
finish();
}
static private void copy(InputStream in, File dst) throws IOException {
FileOutputStream out=new FileOutputStream(dst);
byte[] buf=new byte[1024];
int len;
while ((len=in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
}
}
在您的情况下，您将在启动需要字体的JNI代码之前执行此工作.并且，由于路径可能会因设备而异，或者因用户而异，因此请将字体的路径传递给您的JNI代码，而不要尝试在C/C ++中对其进行硬编码.
I have successfully put my font onto the apk in the assets/ folder of my apk. I'm currently trying to get the Freetype library to see the Arial.ttf inside of the folder, but it can't find it.
APK structure:
apk/
AndroidManifest.xml
assets/
Arial.ttf
classes.dex
lib/
META-INF/
res/
resources.arsc
Loading the font:
FT_Face face;
if (FT_New_Face(ft, "/assets/Arial.ttf", 0, &face)) // TODO: get font locally
__android_log_print(ANDROID_LOG_INFO, "SetupGlyphs", "ERROR::FREETYPE: Failed to load font.");
Assets are files on the development machine. They are not files on the device. They are entries in the ZIP archive that is the APK.
In Java code (most likely), you will need to copy the asset (from AssetManager) to a local file on the filesystem, then have your native code use that local filesystem copy.
For example, this activity, copies a PDF from an asset to internal storage, to be able to view it using FileProvider and a third-party PDF viewer:
/***
Copyright (c) 2013 CommonsWare, LLC
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy
of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
by applicable law or agreed to in writing, software distributed under the
License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
OF ANY KIND, either express or implied. See the License for the specific
language governing permissions and limitations under the License.
From _The Busy Coder's Guide to Android Development_
https://commonsware.com/Android
*/
package com.commonsware.android.cp.v4file;
import android.app.Activity;
import android.content.Intent;
import android.content.res.AssetManager;
import android.os.Bundle;
import android.support.v4.content.FileProvider;
import android.util.Log;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class FilesCPDemo extends Activity {
private static final String AUTHORITY="com.commonsware.android.cp.v4file";
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
File f=new File(getFilesDir(), "test.pdf");
if (!f.exists()) {
AssetManager assets=getResources().getAssets();
try {
copy(assets.open("test.pdf"), f);
}
catch (IOException e) {
Log.e("FileProvider", "Exception copying from assets", e);
}
}
Intent i=
new Intent(Intent.ACTION_VIEW,
FileProvider.getUriForFile(this, AUTHORITY, f));
i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(i);
finish();
}
static private void copy(InputStream in, File dst) throws IOException {
FileOutputStream out=new FileOutputStream(dst);
byte[] buf=new byte[1024];
int len;
while ((len=in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
}
}
In your case, you would do this work before starting your JNI code that requires the font. And, since the path might vary from device to device or user to user, pass in the path to the font to your JNI code, rather than trying to hard-code it in the C/C++.
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