Android SDK 自带项目GestureBuilderActivity

需要android.permission.WRITE_EXTERNAL_STORAGE权限

<?xml version="1.0" encoding="UTF-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.android.gesture.builder"> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <application> <activity android:name="GestureBuilderActivity" android:label="@string/application_name" android:icon="@drawable/ic_gesturebuilder"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> <activity android:name="CreateGestureActivity" android:label="@string/label_create_gesture" /> </application></manifest>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"> <ListView android:id="@android:id/list" android:layout_width="fill_parent" android:layout_height="0dip" android:layout_weight="1.0" /> <TextView android:id="@android:id/empty" android:layout_width="fill_parent" android:layout_height="0dip" android:layout_weight="1.0" android:gravity="center" android:text="@string/gestures_loading" android:textAppearance="?android:attr/textAppearanceMedium" /> <LinearLayout style="@android:style/ButtonBar" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/addButton" android:onClick="addGesture" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:enabled="false" android:text="@string/button_add" /> <Button android:id="@+id/reloadButton" android:onClick="reloadGestures" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:enabled="false" android:text="@string/button_reload" /> </LinearLayout></LinearLayout>

/* * 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. */package com.android.gesture.builder;import android.app.Dialog;import android.app.AlertDialog;import android.app.ListActivity;import android.os.Bundle;import android.os.AsyncTask;import android.os.Environment;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.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 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); setContentView(R.layout.gestures_list); mAdapter = new GesturesAdapter(this); setListAdapter(mAdapter); //设置ListAdapter为@android:id/list if (sStore == null) { sStore = GestureLibraries.fromFile(mStoreFile); } mEmpty = (TextView) findViewById(android.R.id.empty); loadGestures(); //注册环境Menu事件为ListView @android:id/list registerForContextMenu(getListView()); } static GestureLibrary getStore() { return sStore; }//点击Reload按钮时间，配置在资源gestures_list.xml @SuppressWarnings({"UnusedDeclaration"}) public void reloadGestures(View v) { loadGestures(); } //点击add getsture按钮时间，配置在资源gestures_list. @SuppressWarnings({"UnusedDeclaration"}) public void addGesture(View v) { Intent intent = new Intent(this, CreateGestureActivity.class); startActivityForResult(intent, REQUEST_NEW_GESTURE); } @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() { //搜寻未完成则取消，从新运行 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() { //列表为空是显示 if (mAdapter.getCount() == 0) { mEmpty.setText(R.string.gestures_empty); } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); //销毁时如果正在重命名Gesture保存状态 if (mCurrentRenameGesture != null) { outState.putLong(GESTURES_INFO_ID, mCurrentRenameGesture.gesture.getID()); } } @Override protected void onRestoreInstanceState(Bundle state) { super.onRestoreInstanceState(state); //重新创建时恢复状态 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); //获取ContextMenu点击点所在的view 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(); //获取ContextMenu点击点所在的view的TAG 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; //系统自动调用onCreateDialog->onPrepareDialog 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); //为Dialog中EditText赋值 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); //图标 builder.setTitle(getString(R.string.gestures_rename_title)); builder.setCancelable(true); //可点击back回退 builder.setOnCancelListener(new Dialog.OnCancelListener() {//back回退时间监听 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.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; } } //更新ListView 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(); //保存292行没有 sStore.save() 所以当修改后，重新Reload时原先修改会丢失 final GesturesAdapter adapter = mAdapter; adapter.setNotifyOnChange(false); adapter.remove(gesture); adapter.sort(mSorter); //排序 checkForEmpty(); adapter.notifyDataSetChanged(); //更新 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;//onPreExecute->doInBackground(onProgressUpdate)->onPostExecute @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; //是否有存储卡 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)) { //把Gesture转化为Bitmap final Bitmap bitmap = gesture.toBitmap(mThumbnailSize, mThumbnailSize, mThumbnailInset, mPathColor); final NamedGesture namedGesture = new NamedGesture(); namedGesture.gesture = gesture; namedGesture.name = name; //ListView 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; //创建线程安全的HashMap 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); //设置目标TAG，在211行有使用有保存数据的作用 label.setText(gesture.name); //在TextView中放入图片资源显示setCompoundDrawablesWithIntrinsicBounds label.setCompoundDrawablesWithIntrinsicBounds(mThumbnails.get(gesture.gesture.getID()), null, null, null); return convertView; } }}

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