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[DRAFT] explorer: [android] open directory #26
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| package explorer | ||
|
|
||
| import ( | ||
| "gioui.org/app" | ||
| "git.wow.st/gmp/jni" | ||
| "os" | ||
| ) | ||
|
|
||
| //go:generate javac -source 8 -target 8 -bootclasspath $ANDROID_HOME/platforms/android-30/android.jar -d $TEMP/explorer_file_android/classes dir_android.java | ||
| //go:generate jar cf dir_android.jar -C $TEMP/explorer_file_android/classes . | ||
|
|
||
| type Directory struct { | ||
| createFile jni.MethodID | ||
| libClass jni.Class | ||
| libObject jni.Object | ||
|
|
||
| url jni.Object | ||
| openFile jni.MethodID | ||
| } | ||
|
|
||
| func newDirectory(env jni.Env, url jni.Object) (*Directory, error) { | ||
| f := &Directory{url: url} | ||
|
|
||
| class, err := jni.LoadClass(env, jni.ClassLoaderFor(env, jni.Object(app.AppContext())), "org/gioui/x/explorer/dir_android") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| obj, err := jni.NewObject(env, class, jni.GetMethodID(env, class, "<init>", `()V`)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // For some reason, using `f.stream` as argument for a constructor (`public file_android(Object j) {}`) doesn't work. | ||
| if err := jni.CallVoidMethod(env, obj, jni.GetMethodID(env, class, "setHandle", `(Ljava/lang/Object;)V`), jni.Value(f.url)); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| f.libObject = jni.NewGlobalRef(env, obj) | ||
| f.libClass = jni.Class(jni.NewGlobalRef(env, jni.Object(class))) | ||
| f.openFile = jni.GetMethodID(env, f.libClass, "readFile", "(Landroid/view/View;Ljava/lang/String;)Ljava/lang/Object;") | ||
| f.createFile = jni.GetMethodID(env, f.libClass, "writeFile", "(Landroid/view/View;Ljava/lang/String;)Ljava/lang/Object;") | ||
|
|
||
| return f, nil | ||
|
|
||
| } | ||
|
|
||
| func (d *Directory) ReadFile(name string) (file *File, err error) { | ||
| if d == nil || d.libObject == 0 { | ||
| return nil, os.ErrClosed | ||
| } | ||
|
|
||
| err = jni.Do(jni.JVMFor(app.JavaVM()), func(env jni.Env) error { | ||
| nameJava := jni.JavaString(env, name) | ||
| stream, err := jni.CallObjectMethod(env, d.libObject, d.openFile, jni.Value(_View), jni.Value(nameJava)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if stream == 0 { | ||
| return os.ErrNotExist | ||
| } | ||
|
|
||
| file, err = newFile(env, stream) | ||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return file, nil | ||
| } | ||
|
|
||
| /* | ||
| func (d *Directory) OpenDirectory(name string) (Directory, error) { | ||
| // Implementation for opening a subdirectory in the directory | ||
| return nil, nil | ||
| } | ||
|
|
||
| */ | ||
|
|
||
| func (d *Directory) WriteFile(name string) (file *File, err error) { | ||
| if d == nil || d.libObject == 0 { | ||
| return nil, os.ErrClosed | ||
| } | ||
|
|
||
| err = jni.Do(jni.JVMFor(app.JavaVM()), func(env jni.Env) error { | ||
| nameJava := jni.JavaString(env, name) | ||
| stream, err := jni.CallObjectMethod(env, d.libObject, d.createFile, jni.Value(_View), jni.Value(nameJava)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if stream == 0 { | ||
| return os.ErrExist | ||
| } | ||
|
|
||
| file, err = newFile(env, stream) | ||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return file, nil | ||
| } | ||
|
|
||
| /* | ||
| func (d *Directory) CreateDirectory(name string) (Directory, error) { | ||
| // Implementation for creating a subdirectory in the directory | ||
| return nil, nil | ||
| } | ||
|
|
||
| func (d *Directory) ListFiles() ([]File, error) { | ||
| // Implementation for listing files in the directory | ||
| return nil, nil | ||
| } | ||
|
|
||
| func (d *Directory) ListDirectories() ([]Directory, error) { | ||
| // Implementation for listing subdirectories in the directory | ||
| return nil, nil | ||
| } | ||
|
|
||
| */ | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package org.gioui.x.explorer; | ||
|
|
||
| import android.content.Context; | ||
| import android.net.Uri; | ||
| import android.provider.DocumentsContract; | ||
| import android.database.Cursor; | ||
|
|
||
| import android.view.View; | ||
| import java.io.InputStream; | ||
| import java.io.OutputStream; | ||
|
|
||
| public class dir_android { | ||
| public Object handler; | ||
|
|
||
| public void setHandle(Object f) { | ||
| this.handler = f; | ||
| } | ||
|
|
||
| public Object readFile(View view, String filename) { | ||
| try { | ||
| Context ctx = view.getContext(); | ||
| Uri folderUri = (Uri) handler; | ||
| Uri fileUri = findFile(ctx, folderUri, filename); | ||
| if (fileUri == null) { | ||
| return null; | ||
| } | ||
|
|
||
| return ctx.getContentResolver().openInputStream(fileUri); | ||
| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| public Object writeFile(View view, String filename) { | ||
| try { | ||
| Context ctx = view.getContext(); | ||
| Uri folderUri = (Uri) handler; | ||
| Uri fileUri = findFile(ctx, folderUri, filename); | ||
|
|
||
| if (fileUri == null) { | ||
| fileUri = DocumentsContract.createDocument(ctx.getContentResolver(), folderUri, "application/octet-stream", filename); | ||
| } | ||
|
|
||
| return ctx.getContentResolver().openOutputStream(fileUri, "wt"); | ||
| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| private Uri findFile(Context ctx, Uri folderUri, String filename) { | ||
| String folderDocId = DocumentsContract.getDocumentId(folderUri); | ||
| Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(folderUri, folderDocId); | ||
|
|
||
| try (Cursor cursor = ctx.getContentResolver().query(childrenUri, new String[] {DocumentsContract.Document.COLUMN_DOCUMENT_ID, DocumentsContract.Document.COLUMN_DISPLAY_NAME},null, null, null)) { | ||
| if (cursor != null) { | ||
| while (cursor.moveToNext()) { | ||
| String docId = cursor.getString(0); | ||
| String name = cursor.getString(1); | ||
| if (filename.equals(name)) { | ||
| return DocumentsContract.buildDocumentUriUsingTree(folderUri, docId); | ||
| } | ||
| } | ||
| } | ||
| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
| } |
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Where and how are these global references cleaned up? I don't see any mechanism to do that, and I don't think the JVM is able to do it automatically.