第一个Android小应用MagicTablet ---基于Android APIDemo GestureBuilder 开发的手势应用

　　MagicTablet是我的第一个android应用程序，也是自己这几周来学习android基础的一个总结。总体上来讲，MagicTablet的实用性不是很强，算是一个练手的作品。写这篇博客目的，是为了更好地梳理知识，当然如果你有好的建议和不同的见解可以加本人QQ：386363026 和本人的Android交流群 219228300。

 

　　一：MagicTablet的框架结构

 

　　二：相应的代码

　　1： MagicTabletActivity.java

package persen.android;

import java.io.File;
import java.util.ArrayList;

import persen.android.R.raw;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.Prediction;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.SyncStateContract.Constants;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;


//主界面
public class MagicTabletActivity extends Activity implements OnGesturePerformedListener{
    /** Called when the activity is first created. */
    GestureLibrary library;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //加载手势库
        File mStoreFile = new File(Environment.getExternalStorageDirectory(), "gestures");
        library = GestureLibraries.fromFile(mStoreFile);
        library.load();
        GestureOverlayView  gestures = (GestureOverlayView)findViewById(R.id.gestureOverlayView1);
        //添加手势监听函数
        gestures.addOnGesturePerformedListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.defaultmenu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        // TODO Auto-generated method stub
        int choose = item.getItemId();
        switch(choose){
        case R.id.itemCreateGesture: Intent createGestureIntent = new Intent(this,
                GestureBuilderActivity.class);
                                     startActivity(createGestureIntent);
                                     break;
        case R.id.itemMore: Intent moreIntent = new Intent(MagicTabletActivity.this,MoreListView.class);
                               startActivity(moreIntent);
                               break;
        case R.id.itemSetting: Intent settingIntent = new Intent(MagicTabletActivity.this,SettingListView.class);
                               startActivity(settingIntent);
                               break;
        }
        return super.onMenuItemSelected(featureId, item);
    }

    public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
        // TODO Auto-generated method stub
        //判断手势是否在library中
        ArrayList<Prediction> predictions = library.recognize(gesture);
        if(!predictions.isEmpty()){
            Prediction prediction = predictions.get(0);
            
            //获取数据库中输入手势的ID号和号码（可空）
            MySQLiteOpenHelper help = new MySQLiteOpenHelper(this,"MagicTablet.db",null,1);
            SQLiteDatabase db =help.getReadableDatabase();
            
            String gestureName = prediction.name;            
            
            Cursor cursor = db.rawQuery("select GestureId , PhoneNumber from Gestures where GestureName='"+gestureName+"';", 
                    new String[]{});
            int idColumn = cursor.getColumnIndex("GestureId");
            int phoneColnum = cursor.getColumnIndex("PhoneNumber");
            cursor.moveToFirst();
            int gestureId = cursor.getInt(idColumn);
            String gesturePhone = cursor.getString(phoneColnum);
            db.close();
            Toast.makeText(this, "正在识别中...", 500).show();
            if(prediction.score>4){    
                
                switch(gestureId){
                case 0: Intent CAMIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                        startActivity(CAMIntent);
                        break;
                case 1: Intent PICKIntent = new Intent(Intent.ACTION_ANSWER);
                        startActivity(PICKIntent);
                        break;
                case 2: 
                        Intent CALLIntent = new Intent(Intent.ACTION_CALL);
                        CALLIntent.setData(Uri.parse("tel:"+ gesturePhone));
                        startActivity(CALLIntent);
                        break;
                        
                case 3: Uri smsToUri = Uri.parse("smsto:"+gesturePhone);
                        Intent SMSIntent = new Intent(Intent.ACTION_SENDTO,smsToUri);
                        startActivity(SMSIntent);
                        break;
                case 4: Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
                        emailIntent.setType("plain/text");
                        //设置邮件默认地址
                        emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, "");
                        //设置邮件默认标题
                        emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "");
                        //设置要默认发送的内容
                        emailIntent.putExtra(android.content.Intent.EXTRA_TEXT,"");
                        //调用系统的邮件系统
                        startActivity(Intent.createChooser(emailIntent, "请选择邮件发送软件"));
                        break;
                default:Toast.makeText(this, "手势分辨率太低", 1000);
                        break;
                }        
        }else{
            Toast.makeText(this, "该手势未加入手势库", 1000);
        }
    }
    }
}

　　2: SettingListView.java

　　　　一：调用系统中存在的浏览器

　　　　　　Intent browserIntent = new Intent(Intent.ACTION_VIEW);     

　　　　　　browserIntent.setType("plain/text");     

　　　　　　browserIntent.setData(Uri.parse("http://www.cnblogs.com/persen-lee/"));     

　　　　　　startActivity(Intent.createChooser(browserIntent, "请选择浏览器")); //通过相同的方法可以调用系统中存在的邮箱...

详解见代码

package persen.android;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.*;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;

public class SettingListView extends Activity  implements OnItemClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.set);
        String[] items = new String[]{"检查更新","外观设置","关于我们"};

        
        ListView listViewSetting = (ListView)findViewById(R.id.listViewSetting);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1, items);
    
        listViewSetting.setAdapter(adapter);
        listViewSetting.setOnItemClickListener(this);
    }

    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        // TODO Auto-generated method stub
        switch((int)arg3){
        case 0: 
                Intent browserIntent = new Intent(Intent.ACTION_VIEW);
                browserIntent.setType("plain/text");
                browserIntent.setData(Uri.parse("http://www.cnblogs.com/persen-lee/"));
                startActivity(Intent.createChooser(browserIntent, "请选择浏览器"));
                /*
                String[] dialogList = new String[]{"互联网","uc 浏览器"};
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("使用以下方式发送").setItems(dialogList, new DialogInterface.OnClickListener(){
            
                public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                Intent browserIntent = new Intent(Intent.ACTION_VIEW);
                browserIntent.setData(Uri.parse("http://www.cnblogs.com/persen-lee/"));
                switch(which){
                case 0: 
                        browserIntent.setClassName("com.android.browser","com.android.browser.BrowserActivity"); 
                        break;
                case 1:break;
                }
                startActivity(browserIntent);                        
            }
            
        });
                AlertDialog dialog = builder.create();
                dialog.show(); */
                break;
        case 1:break;
        case 2:String[] items = new String[]{"我们的邮箱(polocoke@163.com)","我们的网址(http://www.cnblogs.com/persen-lee/)"};
               AlertDialog.Builder aboutBuilder = new AlertDialog.Builder(this);
               aboutBuilder.setTitle("关于我们").setItems(items, new OnClickListener(){

                public void onClick(DialogInterface dialog, int which) {
                    // TODO Auto-generated method stub
                    
                }                   
               });
               AlertDialog aboutDlg = aboutBuilder.create();
               aboutDlg.show();
               break;
        }
        
    }


}

　　3: MoreListView.java

　　　　一：自定义的Dialog

　　　　　　Dialog donateDialog = new Dialog(this);     

　　　　　　donateDialog.setContentView(R.layout.custom_dialog);     //调用自己设计的Dialog布局文件

　　　　　　donateDialog.setTitle("捐助我们");                                    //设置标题  

　　　　　　TextView donateText = (TextView) donateDialog.findViewById(R.id.text);     

　　　　　　donateText.setText("我们的网址是：http://www.cnblogs.com/persen-lee/\n"+"感谢您的支持");     //设置文本

　　　　　　ImageView donateImage = (ImageView) donateDialog.findViewById(R.id.image);                   //设置标题

　　　　　　donateImage.setImageResource(R.drawable.donate);   //R.drawable.donate 图标资源    

　　　　　　donateDialog.show();

详解见代码

package persen.android;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;

public class MoreListView extends Activity implements OnItemClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.more);
        String[] items = new String[]{"MagicTablet 1.0","版本记录和新功能","使用帮助","常见问题","捐助我们","特别致谢"};

        
        ListView listViewSetting = (ListView)findViewById(R.id.listViewMore);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1, items);
    
        listViewSetting.setAdapter(adapter);
    //    listViewSetting.setOnItemSelectedListener(this);
        listViewSetting.setOnItemClickListener(this);
    }
    
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub
        switch((int)arg3){
        case 0: break;
        case 1: AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("目前无任何版本更新").setPositiveButton("确定", 
                        new DialogInterface.OnClickListener() { 
                        public void onClick(DialogInterface dialog, int id) {
                        
                        //MoreListView.this.finish();           
                        }       
                    });
                AlertDialog dialog = builder.create();
                dialog.show();
                break;
        case 2: Intent usingHelpIntent = new Intent(this,UsingHelp.class);
                startActivity(usingHelpIntent);
                break;
        case 3: Intent faqIntent = new Intent(this,FAQActivity.class);
                startActivity(faqIntent);
                break;
                //Context mContext = getApplicationContext();
        case 4: Dialog donateDialog = new Dialog(this);
                donateDialog.setContentView(R.layout.custom_dialog);
                donateDialog.setTitle("捐助我们");
                TextView donateText = (TextView) donateDialog.findViewById(R.id.text);
                donateText.setText("我们的网址是：http://www.cnblogs.com/persen-lee/\n"+"感谢您的支持");
                ImageView donateImage = (ImageView) donateDialog.findViewById(R.id.image);
                donateImage.setImageResource(R.drawable.donate);
                donateDialog.show();
                break;
                
        case 5: Dialog thanksDialog = new Dialog(this);
                thanksDialog.setContentView(R.layout.custom_dialog);
                thanksDialog.setTitle("特别感谢");
                TextView thanksText = (TextView) thanksDialog.findViewById(R.id.text);
                thanksText.setText("感谢那些曾经给予我无私帮助的朋友");
                ImageView thanksImage = (ImageView) thanksDialog.findViewById(R.id.image);
                thanksImage.setImageResource(R.drawable.thanks);
                thanksDialog.show();
                break;
        }
        
    }

}

     4: GestureBuilderActivity.java 和 CreateGestureActivity.java 来自于Android APIDemo 里的GestureBuilder。

 

　　5：读取文本文件并显示在ListView里。

package persen.android;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class FAQActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.faq);
        
        TextView textViewFAQ = (TextView)findViewById(R.id.textViewFAQ);
        String data = readFileFromRaw(R.raw.help_problem);
        textViewFAQ.setText(data);
    }
    
    //读取资源文件里的文本 
    //若出现文本显示乱码，可以使用文本转换 EncodingUtils
    //最更本的做法是保存txt是用utf-8 或unicode 
    private String readFileFromRaw(int id){
        
        InputStreamReader inputReader = new InputStreamReader(getResources().openRawResource(id));
        BufferedReader  bufReader = new BufferedReader(inputReader);
        String line="";
        String data="";
        try {
            while((line = bufReader.readLine())!=null){
                data+=line;
                data+="\n";
            }
            inputReader.close();
            bufReader.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            Log.i("FAQ", "reading file from raw failed");
            e.printStackTrace();
        }    
        return data;
    }
}

 　　6：相关问题

　　很重要的一点，当使用到android相关服务的时候要设置AndroidManifest。如下是MagicTablet调用的相关系统服务在Manifest里的注册

<uses-permission android:name="android.permission.CALL_PHONE"/>  

<uses-permission android:name="android.permission.SEND_SMS" />  

<uses-permission android:name="android.permission.READ_CONTACTS"/>  

<uses-permission android:name="android.permission.CAMERA" />  

<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />"  

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />"

 三：个人总结

　　MagicTablet基本用到了Android基础性的东西。比如：android 四大基础组件,Ui,数据存储 和手势。在写MagicTablet中遇到了SQLite相关的一些问题，很感谢网友 Future 和 Android技术交流群 里朋友们 以及 《精通Android3》的作者Dave MacLean 提供的帮助。