Java tutorial
package com.cl.slack.gesture; /* * Copyright (C) 2009 The Android Open Source Project * * 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. */ import android.Manifest; import android.app.Dialog; import android.app.AlertDialog; import android.app.ListActivity; import android.content.pm.PackageManager; import android.os.Build; import android.os.Bundle; import android.os.AsyncTask; import android.os.Environment; import android.support.v4.app.ActivityCompat; import android.util.Log; import android.view.View; import android.view.ContextMenu; import android.view.MenuItem; import android.view.LayoutInflater; import android.view.ViewGroup; import android.gesture.GestureLibrary; import android.gesture.Gesture; import android.gesture.GestureLibraries; import android.widget.TextView; import android.widget.EditText; import android.widget.AdapterView; import android.widget.Toast; import android.widget.ArrayAdapter; import android.content.DialogInterface; import android.content.Context; import android.content.Intent; import android.content.res.Resources; import android.text.TextUtils; import android.graphics.Bitmap; import android.graphics.drawable.Drawable; import android.graphics.drawable.BitmapDrawable; import java.io.IOException; import java.security.Permission; import java.util.Map; import java.util.Collections; import java.util.HashMap; import java.util.Comparator; import java.util.Set; import java.io.File; public class GestureBuilderActivity extends ListActivity { private final int REQ_PERMISSION_WRITE_STORAGE = 0x10; private static final int STATUS_SUCCESS = 0; private static final int STATUS_CANCELLED = 1; private static final int STATUS_NO_STORAGE = 2; private static final int STATUS_NOT_LOADED = 3; private static final int MENU_ID_RENAME = 1; private static final int MENU_ID_REMOVE = 2; private static final int DIALOG_RENAME_GESTURE = 1; private static final int REQUEST_NEW_GESTURE = 1; // Type: long (id) private static final String GESTURES_INFO_ID = "gestures.info_id"; private final File mStoreFile = new File(Environment.getExternalStorageDirectory(), "gestures"); private final Comparator<NamedGesture> mSorter = new Comparator<NamedGesture>() { public int compare(NamedGesture object1, NamedGesture object2) { return object1.name.compareTo(object2.name); } }; private static GestureLibrary sStore; private GesturesAdapter mAdapter; private GesturesLoadTask mTask; private TextView mEmpty; private Dialog mRenameDialog; private EditText mInput; private NamedGesture mCurrentRenameGesture; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, REQ_PERMISSION_WRITE_STORAGE); } else { withPermission(); } setContentView(R.layout.gestures_list); mAdapter = new GesturesAdapter(this); setListAdapter(mAdapter); initGestures(); mEmpty = (TextView) findViewById(android.R.id.empty); loadGestures(); registerForContextMenu(getListView()); } private void initGestures() { sStore = GestureLibraries.fromFile(mStoreFile); // sStore = GestureLibraries.fromRawResource(this,R.raw.gestures); } static GestureLibrary getStore() { return sStore; } @SuppressWarnings({ "UnusedDeclaration" }) public void reloadGestures(View v) { loadGestures(); } @SuppressWarnings({ "UnusedDeclaration" }) public void addGesture(View v) { Intent intent = new Intent(this, CreateGestureActivity.class); startActivityForResult(intent, REQUEST_NEW_GESTURE); } // ???? @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if (requestCode == REQ_PERMISSION_WRITE_STORAGE) { for (int i = 0; i < grantResults.length; i++) { if (grantResults[i] == PackageManager.PERMISSION_GRANTED) { withPermission(); } } } } private void withPermission() { try { if (!mStoreFile.exists()) { if (mStoreFile.createNewFile()) { Log.i("slack", "create Dir:" + mStoreFile.getAbsolutePath() + " success"); } } } catch (IOException e) { e.printStackTrace(); } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == RESULT_OK) { switch (requestCode) { case REQUEST_NEW_GESTURE: loadGestures(); break; } } } private void loadGestures() { if (mTask != null && mTask.getStatus() != GesturesLoadTask.Status.FINISHED) { mTask.cancel(true); } mTask = (GesturesLoadTask) new GesturesLoadTask().execute(); } @Override protected void onDestroy() { super.onDestroy(); if (mTask != null && mTask.getStatus() != GesturesLoadTask.Status.FINISHED) { mTask.cancel(true); mTask = null; } cleanupRenameDialog(); } private void checkForEmpty() { if (mAdapter.getCount() == 0) { mEmpty.setText(R.string.gestures_empty); } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (mCurrentRenameGesture != null) { outState.putLong(GESTURES_INFO_ID, mCurrentRenameGesture.gesture.getID()); } } @Override protected void onRestoreInstanceState(Bundle state) { super.onRestoreInstanceState(state); long id = state.getLong(GESTURES_INFO_ID, -1); if (id != -1) { final Set<String> entries = sStore.getGestureEntries(); out: for (String name : entries) { for (Gesture gesture : sStore.getGestures(name)) { if (gesture.getID() == id) { mCurrentRenameGesture = new NamedGesture(); mCurrentRenameGesture.name = name; mCurrentRenameGesture.gesture = gesture; break out; } } } } } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo; menu.setHeaderTitle(((TextView) info.targetView).getText()); menu.add(0, MENU_ID_RENAME, 0, R.string.gestures_rename); menu.add(0, MENU_ID_REMOVE, 0, R.string.gestures_delete); } @Override public boolean onContextItemSelected(MenuItem item) { final AdapterView.AdapterContextMenuInfo menuInfo = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); final NamedGesture gesture = (NamedGesture) menuInfo.targetView.getTag(); switch (item.getItemId()) { case MENU_ID_RENAME: renameGesture(gesture); return true; case MENU_ID_REMOVE: deleteGesture(gesture); return true; } return super.onContextItemSelected(item); } private void renameGesture(NamedGesture gesture) { mCurrentRenameGesture = gesture; showDialog(DIALOG_RENAME_GESTURE); } @Override protected Dialog onCreateDialog(int id) { if (id == DIALOG_RENAME_GESTURE) { return createRenameDialog(); } return super.onCreateDialog(id); } @Override protected void onPrepareDialog(int id, Dialog dialog) { super.onPrepareDialog(id, dialog); if (id == DIALOG_RENAME_GESTURE) { mInput.setText(mCurrentRenameGesture.name); } } private Dialog createRenameDialog() { final View layout = View.inflate(this, R.layout.dialog_rename, null); mInput = (EditText) layout.findViewById(R.id.name); ((TextView) layout.findViewById(R.id.label)).setText(R.string.gestures_rename_label); AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setIcon(0); builder.setTitle(getString(R.string.gestures_rename_title)); builder.setCancelable(true); builder.setOnCancelListener(new Dialog.OnCancelListener() { public void onCancel(DialogInterface dialog) { cleanupRenameDialog(); } }); builder.setNegativeButton(getString(R.string.cancel_action), new Dialog.OnClickListener() { public void onClick(DialogInterface dialog, int which) { cleanupRenameDialog(); } }); // builder.setNeutralButton(getString(R.string.cancel_action), // new Dialog.OnClickListener() { // public void onClick(DialogInterface dialog, int which) { // cleanupRenameDialog(); // } // } // ); builder.setPositiveButton(getString(R.string.rename_action), new Dialog.OnClickListener() { public void onClick(DialogInterface dialog, int which) { changeGestureName(); } }); builder.setView(layout); return builder.create(); } private void changeGestureName() { final String name = mInput.getText().toString(); if (!TextUtils.isEmpty(name)) { final NamedGesture renameGesture = mCurrentRenameGesture; final GesturesAdapter adapter = mAdapter; final int count = adapter.getCount(); // Simple linear search, there should not be enough items to warrant // a more sophisticated search for (int i = 0; i < count; i++) { final NamedGesture gesture = adapter.getItem(i); if (gesture.gesture.getID() == renameGesture.gesture.getID()) { sStore.removeGesture(gesture.name, gesture.gesture); gesture.name = mInput.getText().toString(); sStore.addGesture(gesture.name, gesture.gesture); break; } } adapter.notifyDataSetChanged(); } mCurrentRenameGesture = null; } private void cleanupRenameDialog() { if (mRenameDialog != null) { mRenameDialog.dismiss(); mRenameDialog = null; } mCurrentRenameGesture = null; } private void deleteGesture(NamedGesture gesture) { sStore.removeGesture(gesture.name, gesture.gesture); sStore.save(); initGestures();// reload final GesturesAdapter adapter = mAdapter; adapter.setNotifyOnChange(false); adapter.remove(gesture); adapter.sort(mSorter); checkForEmpty(); adapter.notifyDataSetChanged(); Toast.makeText(this, R.string.gestures_delete_success, Toast.LENGTH_SHORT).show(); } private class GesturesLoadTask extends AsyncTask<Void, NamedGesture, Integer> { private int mThumbnailSize; private int mThumbnailInset;// ? private int mPathColor; // @Override protected void onPreExecute() { super.onPreExecute(); final Resources resources = getResources(); mPathColor = resources.getColor(R.color.gesture_color); mThumbnailInset = (int) resources.getDimension(R.dimen.gesture_thumbnail_inset); mThumbnailSize = (int) resources.getDimension(R.dimen.gesture_thumbnail_size); findViewById(R.id.addButton).setEnabled(false); findViewById(R.id.reloadButton).setEnabled(false); mAdapter.setNotifyOnChange(false); mAdapter.clear(); } @Override protected Integer doInBackground(Void... params) { if (isCancelled()) return STATUS_CANCELLED; if (!Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) { return STATUS_NO_STORAGE; } final GestureLibrary store = sStore; if (store.load()) { for (String name : store.getGestureEntries()) { if (isCancelled()) break; for (Gesture gesture : store.getGestures(name)) { final Bitmap bitmap = gesture.toBitmap(mThumbnailSize, mThumbnailSize, mThumbnailInset, mPathColor); final NamedGesture namedGesture = new NamedGesture(); namedGesture.gesture = gesture; namedGesture.name = name; mAdapter.addBitmap(namedGesture.gesture.getID(), bitmap); publishProgress(namedGesture); } } return STATUS_SUCCESS; } return STATUS_NOT_LOADED; } @Override protected void onProgressUpdate(NamedGesture... values) { super.onProgressUpdate(values); final GesturesAdapter adapter = mAdapter; adapter.setNotifyOnChange(false); for (NamedGesture gesture : values) { adapter.add(gesture); } adapter.sort(mSorter); adapter.notifyDataSetChanged(); } @Override protected void onPostExecute(Integer result) { super.onPostExecute(result); if (result == STATUS_NO_STORAGE) { getListView().setVisibility(View.GONE); mEmpty.setVisibility(View.VISIBLE); mEmpty.setText(getString(R.string.gestures_error_loading, mStoreFile.getAbsolutePath())); } else { findViewById(R.id.addButton).setEnabled(true); findViewById(R.id.reloadButton).setEnabled(true); checkForEmpty(); } } } static class NamedGesture { String name; Gesture gesture; } private class GesturesAdapter extends ArrayAdapter<NamedGesture> { private final LayoutInflater mInflater; private final Map<Long, Drawable> mThumbnails = Collections.synchronizedMap(new HashMap<Long, Drawable>()); public GesturesAdapter(Context context) { super(context, 0); mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } void addBitmap(Long id, Bitmap bitmap) { mThumbnails.put(id, new BitmapDrawable(bitmap)); } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = mInflater.inflate(R.layout.gestures_item, parent, false); } final NamedGesture gesture = getItem(position); final TextView label = (TextView) convertView; label.setTag(gesture); label.setText(gesture.name); label.setCompoundDrawablesWithIntrinsicBounds(mThumbnails.get(gesture.gesture.getID()), null, null, null); return convertView; } } }