1、基于Android平臺(tái)記事本的設(shè)計(jì)與實(shí)現(xiàn) 1.設(shè)計(jì)目的記事本的基本功能就是記事，手機(jī)用戶首先用到的就是文本記事，輸入事務(wù)信息以文本的形式展現(xiàn)出來，存儲(chǔ)起來。隨著用戶需求的增加，可能希望用圖形來代替文本來記事，用戶之間打開記事本，看到圖片就能聯(lián)系自己所記載的事務(wù)信息。這樣免去了輸入文字的麻煩，反而會(huì)更簡單。又或者是文本與圖片的交叉運(yùn)用，可以讓用戶自己選擇自己喜歡的記事方式，更加自由與便捷。所以此功能的意義是讓簡單的記事信息能以文本、圖文和視頻表達(dá)，更加豐富多彩。2.設(shè)計(jì)內(nèi)容本設(shè)計(jì)的基本內(nèi)容是在Android平臺(tái)下，設(shè)計(jì)與實(shí)現(xiàn)記事本軟件。具體要實(shí)現(xiàn)的功能是：(1)設(shè)計(jì)實(shí)現(xiàn)添加“文字”，“圖文”，“

2、視頻”這三個(gè)主要的功能模塊。(2)進(jìn)入添加后，有“保存”，“取消”兩種選擇。(3)主頁面顯示記事列表，點(diǎn)擊可查看及時(shí)內(nèi)容，并有“刪除”，“返回”兩種選擇。(4)進(jìn)行測(cè)試并分析結(jié)果。3.開發(fā)環(huán)境的安裝與配置3.1 Android開發(fā)平臺(tái)搭建本設(shè)計(jì)主要是以Eclipse為基礎(chǔ)，安裝SDK和ADT插件后，用來開發(fā)安卓項(xiàng)目。開發(fā)平臺(tái)搭建步驟介紹如下。 （1)下載JDK并安裝，安裝后配置環(huán)境變量。（2)下載Eclipse解壓至指定文件夾。（3）下載SDK后解壓至指定文件夾，打開SDK目錄，點(diǎn)擊SDK Manager安裝開發(fā)安卓項(xiàng)目需要的包。（4）啟動(dòng)Eclipse，進(jìn)入HelpInstall New S

3、oftwareAdd，添加ADT插件。（5）進(jìn)入WindowAndroidBrowse，選擇SDK安裝目錄。3.2硬件環(huán)境Android設(shè)備，如Android手機(jī)或平板電腦，主頻在1Ghz及以上，內(nèi)存為512MB以上，系統(tǒng)版本為Android2.1及以上。本設(shè)計(jì)使用Android4.4.4的手機(jī)。3.3 軟件環(huán)境操作系統(tǒng)：windows10IDE：EclipseAndroid SDK 集成環(huán)境4.設(shè)計(jì)主體架構(gòu)4.1 src文件夾src文件夾下com.liwenhuan.notepad包下為系統(tǒng)主要Activity類：NotesDB.java是進(jìn)行數(shù)據(jù)儲(chǔ)存的，通過SQLite保存數(shù)據(jù)。并且用on

4、Create函數(shù)創(chuàng)建數(shù)據(jù)庫。通過設(shè)置兩個(gè)按鈕的監(jiān)聽來實(shí)現(xiàn)對(duì)輸入文本的存儲(chǔ)或退出。MainActivity.java是主Activity，通過設(shè)置三個(gè)按鈕的監(jiān)聽來實(shí)現(xiàn)添加文本、圖文、視頻的記事方式。AddContent.java通過initView方法來判斷記事的方式，實(shí)現(xiàn)對(duì)文本、圖片、視頻的添加，獲取保存文件的時(shí)間。MyAdapter.java是顯示模塊，通過系統(tǒng)提供的Bitmap在記事列表顯示圖片和視頻的縮略圖。SelectAct.java是記事詳情的顯示模塊，通過監(jiān)聽的方法來實(shí)現(xiàn)記事的刪除功能。4.2 gen文件夾gen文件夾是項(xiàng)目自動(dòng)生成的文件夾R.java是工程下各個(gè)資源的標(biāo)識(shí)符負(fù)責(zé)所

5、有資源的索引。4.3 bin文件夾bin文件夾是編譯后的字節(jié)碼存放的目錄，編譯的過程首先是編譯成為androidjava虛擬機(jī)文件classes.dex，再打包成APK格式的包。4.4 res文件夾Res是資源目錄，它包含項(xiàng)目中的資源文件并將其編譯進(jìn)應(yīng)用程序中，向此目錄添加資源時(shí)，會(huì)被R.java自動(dòng)記錄。res目錄存放所有程序中用到的資源文件?！百Y源文件”指的資料文件、圖片等。子目錄有：drawable、layout、values。本設(shè)計(jì)主要用了layout目錄下的布局文件。layout是屏幕布局目錄， activity_main.xml是主界面的布局文件、addcontent.xml是增加

6、數(shù)據(jù)頁面的布局文件、cell.xml是幾個(gè)功能按鈕的布局文件、select.xml是顯示記事詳情以及對(duì)記事進(jìn)行操作的布局文件。5.程序設(shè)計(jì)5.1數(shù)據(jù)存儲(chǔ)之SQLite這個(gè)方法在數(shù)據(jù)保存中非常常用，只是它只會(huì)被一個(gè)程序讀取數(shù)據(jù)，不能在不同程序間共享數(shù)據(jù)。/創(chuàng)建數(shù)據(jù)庫public void onCreate(SQLiteDatabase db) db.execSQL(CREATE TABLE + TABLE_NAME + ( + ID+ INTEGER PRIMARY KEY AUTOINCREMENT, + CONTENT+ TEXT NOT NULL, + PATH + TEXT NOT NU

7、LL, + VIDEO+ TEXT NOT NULL, + TIME + TEXT NOT NULL);5.2 添加文字內(nèi)容當(dāng)以文本方式記事時(shí)，需要對(duì)輸入的文字內(nèi)容進(jìn)行保存。public void initView() if (val.equals(1) / 文字c_img.setVisibility(View.GONE);/隱藏v_video.setVisibility(View.GONE);/隱藏public void onClick(View v) switch (v.getId() case R.id.save:addDB();/添加數(shù)據(jù)finish();/關(guān)閉當(dāng)前Activitybr

8、eak;case R.id.delete:finish();break;5.3適配器配置public class MyAdapter extends BaseAdapter private Context context;private Cursor cursor;private LinearLayout layout;/視圖對(duì)象public MyAdapter(Context context, Cursor cursor) this.context = context;this.cursor = cursor;Overridepublic int getCount() return curs

9、or.getCount();/返回長度Overridepublic Object getItem(int position) return cursor.getPosition();Overridepublic long getItemId(int position) return position;public View getView(int position, View convertView, ViewGroup parent) LayoutInflater inflater = LayoutInflater.from(context);/加載視圖的權(quán)限layout = (Linear

10、Layout) inflater.inflate(R.layout.cell, null);/布局文件TextView contenttv = (TextView) layout.findViewById(R.id.list_content);/獲取上面布局文件中的每一個(gè)內(nèi)容TextView timetv = (TextView) layout.findViewById(R.id.list_time);/查找時(shí)間ImageView imgiv = (ImageView) layout.findViewById(R.id.list_img);/查找圖片ImageView videoiv = (I

11、mageView) layout.findViewById(R.id.list_video);/查找視頻cursor.moveToPosition(position);/查詢String content = cursor.getString(cursor.getColumnIndex(content);/獲取具體內(nèi)容String time = cursor.getString(cursor.getColumnIndex(time);/獲取時(shí)間String url = cursor.getString(cursor.getColumnIndex(path);/獲取圖片的縮略圖String url

12、video = cursor.getString(cursor.getColumnIndex(video);/獲取視頻contenttv.setText(content);/將內(nèi)容傳遞進(jìn)來timetv.setText(time);/將時(shí)間傳遞進(jìn)來videoiv.setImageBitmap(getVideoThumbnail(urlvideo, 200, 200,MediaStore.Images.Thumbnails.MICRO_KIND);/在列表顯示視頻縮略圖imgiv.setImageBitmap(getImageThumbnail(url, 200, 200);/在列表顯示圖片縮略圖

13、return layout;5.4添加圖片和視頻在本設(shè)計(jì)中，不僅提供了以文本方式進(jìn)行記事，還提供了以圖片和視頻方式進(jìn)行記事。public void initView() if (val.equals(2) /圖片c_img.setVisibility(View.VISIBLE);/顯示v_video.setVisibility(View.GONE);/隱藏Intent iimg = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);/跳轉(zhuǎn)到系統(tǒng)相機(jī)phoneFile = new File(Environment.getExternalStorageDire

14、ctory().getAbsoluteFile() + / + getTime() + .jpg);/獲取SD卡絕對(duì)路徑iimg.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(phoneFile);/存儲(chǔ)獲取的圖片信息startActivityForResult(iimg, 1);/啟動(dòng)跳轉(zhuǎn)if (val.equals(3) c_img.setVisibility(View.GONE);/隱藏v_video.setVisibility(View.VISIBLE);/顯示Intent video = new Intent(MediaStore.AC

15、TION_VIDEO_CAPTURE);/跳轉(zhuǎn)到手機(jī)系統(tǒng)信息videoFile = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + / + getTime() + .mp4);/獲取SD卡絕對(duì)路徑video.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(videoFile);/存儲(chǔ)獲取的video信息startActivityForResult(video, 2);/啟動(dòng)跳轉(zhuǎn)/顯示圖片或視頻protected void onActivityResult(

16、int requestCode, int resultCode, Intent data) / TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);if (requestCode = 1) /圖片Bitmap bitmap = BitmapFactory.decodeFile(phoneFile.getAbsolutePath();/獲取路徑c_img.setImageBitmap(bitmap);/展示內(nèi)容if (requestCode = 2) /視頻v_video.set

17、VideoURI(Uri.fromFile(videoFile);/加載視頻v_video.start();/播放視頻5.5 獲取圖片和視頻的縮略圖當(dāng)我們用圖片或制品進(jìn)行記事時(shí)，在列表中需要顯示其縮略圖，可以用系統(tǒng)提供的Bitmap進(jìn)行處理。/獲取圖片的縮略圖public Bitmap getImageThumbnail(String uri, int width, int height) Bitmap bitmap = null;BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBo

18、unds = true;bitmap = BitmapFactory.decodeFile(uri, options);options.inJustDecodeBounds = false;int beWidth = options.outWidth / width;int beHeight = options.outHeight / height;int be = 1;if (beWidth beHeight) be = beWidth; else be = beHeight;if (be = 0) be = 1;options.inSampleSize = be;bitmap = Bitm

19、apFactory.decodeFile(uri, options);bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height,ThumbnailUtils.OPTIONS_RECYCLE_INPUT);return bitmap;/獲取視頻的縮略圖private Bitmap getVideoThumbnail(String uri, int width, int height, int kind) Bitmap bitmap = null;bitmap = ThumbnailUtils.createVideoThumbna

20、il(uri, kind);bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height,ThumbnailUtils.OPTIONS_RECYCLE_INPUT);return bitmap;5.7詳情頁顯示protected void onCreate(Bundle savedInstanceState) / TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.select);/加載詳情/ Syste

21、m.out.println(getIntent().getIntExtra(NotesDB.ID, 0);s_delete = (Button) findViewById(R.id.s_delete);s_back = (Button) findViewById(R.id.s_back);s_img = (ImageView) findViewById(R.id.s_img);s_video = (VideoView) findViewById(R.id.s_video);s_tv = (TextView) findViewById(R.id.s_tv);notesDB = new Notes

22、DB(this);dbWriter = notesDB.getWritableDatabase();/獲取寫權(quán)限s_back.setOnClickListener(this);s_delete.setOnClickListener(this);/如果圖片為空，則隱藏，否則顯示if (getIntent().getStringExtra(NotesDB.PATH).equals(null) s_img.setVisibility(View.GONE); else s_img.setVisibility(View.VISIBLE);if (getIntent().getStringExtra(No

23、tesDB.VIDEO).equals(null) s_video.setVisibility(View.GONE); else s_video.setVisibility(View.VISIBLE);s_tv.setText(getIntent().getStringExtra(NotesDB.CONTENT);/加載TextView的文字信息Bitmap bitmap = BitmapFactory.decodeFile(getIntent().getStringExtra(NotesDB.PATH);/加載圖片信息s_img.setImageBitmap(bitmap);/顯示圖片信息s

24、_video.setVideoURI(Uri.parse(getIntent().getStringExtra(NotesDB.VIDEO);s_video.start();/播放視頻6.測(cè)試6.1虛擬設(shè)備AVD測(cè)試（1）主界面顯示如圖6.1所示。（2）記事頁面顯示如圖6.2所示。圖6.1 圖6.2（3）記事列表顯示如圖6.3所示。（4）記事詳情顯示如圖6.4所示。圖6.3圖6.46.2 真機(jī)測(cè)試將記事本的apk文件導(dǎo)進(jìn)手機(jī)，安裝后進(jìn)行測(cè)試，測(cè)試結(jié)果如下：（1）添加好內(nèi)容后，記事本的記事列表顯示如圖6.5所示。（2）以文本方式添加記事，詳情顯示如圖6.6所示。圖6.5圖6.6（3）以圖文方式添

25、加記事，內(nèi)容詳情頁顯示如圖6.7。（4）以視頻結(jié)合文字方式添加記事，內(nèi)容詳情頁顯示如圖6.8。圖6.7圖6.87.總結(jié)通過此次設(shè)計(jì)過程我會(huì)到了許多知識(shí)，在這個(gè)過程中遇到了許多困難，比如SDK和ADT的版本不能兼容，記事本項(xiàng)目可以在虛擬設(shè)備中運(yùn)行，在真機(jī)上測(cè)試時(shí)卻出現(xiàn)了問題，不能讀取圖片和視頻，通過在網(wǎng)上查找資料，發(fā)現(xiàn)是雖然在代碼中對(duì)SD卡添加了讀取權(quán)限，但沒有在AndroidMainfest.xml中添加對(duì)手機(jī)SD卡的讀取權(quán)限，所以出現(xiàn)了如上的錯(cuò)誤。通過不斷的發(fā)現(xiàn)問題，總結(jié)問題和解決問題的過程，使我對(duì)Android的認(rèn)識(shí)不斷的提高，得到了寶貴的經(jīng)驗(yàn)。代碼：MainActivity.javapa

26、ckage com.liwenhuan.notepad;/采用接口方式public class MainActivity extends Activity implements OnClickListener private Button textbtn, imgbtn, videobtn;/聲明三個(gè)buttonprivate ListView lv; /創(chuàng)建listviewprivate Intent i;/通過intent來創(chuàng)建標(biāo)識(shí)private MyAdapter adapter;private NotesDB notesDB;/數(shù)據(jù)庫對(duì)象private SQLiteDatabase d

27、bReader;/獲取讀取權(quán)限private Cursor cursor;Overrideprotected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();/調(diào)用初始化方法/初始化public void initView() lv = (ListView) findViewById(R.id.list);/找id操作textbtn = (Button) findViewById(R.id.t

28、ext);/找文字imgbtn = (Button) findViewById(R.id.img);/找圖片videobtn = (Button) findViewById(R.id.video);/找視頻textbtn.setOnClickListener(this); /添加監(jiān)聽事件imgbtn.setOnClickListener(this);videobtn.setOnClickListener(this);notesDB = new NotesDB(this);/數(shù)據(jù)庫實(shí)例化dbReader = notesDB.getReadableDatabase();/獲取讀取權(quán)限/獲取記事詳情

29、lv.setOnItemClickListener(new OnItemClickListener() Overridepublic void onItemClick(AdapterView parent, View view,int position, long id) cursor.moveToPosition(position);Intent i = new Intent(MainActivity.this, SelectAct.class);i.putExtra(NotesDB.ID,cursor.getInt(cursor.getColumnIndex(NotesDB.ID);/獲取

30、IDi.putExtra(NotesDB.CONTENT, cursor.getString(cursor.getColumnIndex(NotesDB.CONTENT);/獲取內(nèi)容i.putExtra(NotesDB.TIME,cursor.getString(cursor.getColumnIndex(NotesDB.TIME);/獲取時(shí)間i.putExtra(NotesDB.PATH,cursor.getString(cursor.getColumnIndex(NotesDB.PATH);/獲取圖片i.putExtra(NotesDB.VIDEO,cursor.getString(cur

31、sor.getColumnIndex(NotesDB.VIDEO);/獲取視頻startActivity(i);/跳轉(zhuǎn)到詳情頁);/添加一個(gè)復(fù)寫方法Overridepublic void onClick(View v) i = new Intent(this, AddContent.class);/實(shí)例化操作switch (v.getId() case R.id.text:i.putExtra(flag, 1);startActivity(i);/跳轉(zhuǎn)至AddContent.javabreak;case R.id.img:i.putExtra(flag, 2);startActivity(i)

32、;break;case R.id.video:i.putExtra(flag, 3);startActivity(i);break;public void selectDB() cursor = dbReader.query(NotesDB.TABLE_NAME, null, null, null, null,null, null);adapter = new MyAdapter(this, cursor);lv.setAdapter(adapter);Overrideprotected void onResume() super.onResume();selectDB();NotesDB.j

33、avapackage com.liwenhuan.notepad;public class NotesDB extends SQLiteOpenHelper public static final String TABLE_NAME = notes;/指定名稱public static final String CONTENT = content;/內(nèi)容public static final String PATH = path;/圖片public static final String VIDEO = video;/視頻public static final String ID = _id;

34、/創(chuàng)建idpublic static final String TIME = time;/當(dāng)前保存文本的時(shí)間/復(fù)寫一個(gè)構(gòu)造方法public NotesDB(Context context) super(context, notes, null, 1);/super返回值（context，庫名，null，版本號(hào)）Override/創(chuàng)建數(shù)據(jù)庫public void onCreate(SQLiteDatabase db) /創(chuàng)建db.execSQL(CREATE TABLE + TABLE_NAME + ( + ID+ INTEGER PRIMARY KEY AUTOINCREMENT, + CON

35、TENT+ TEXT NOT NULL, + PATH + TEXT NOT NULL, + VIDEO+ TEXT NOT NULL, + TIME + TEXT NOT NULL);Override/更新數(shù)據(jù)庫，當(dāng)前需求，不需要更新public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) AddContent.javapackage com.liwenhuan.notepad;public class AddContent extends Activity implements OnClickListe

36、ner private String val;/用于接收MainActivity中的跳轉(zhuǎn)的定義private Button savebtn, deletebtn;private EditText ettext;private ImageView c_img;private VideoView v_video;/用來播放視頻private NotesDB notesDB;/創(chuàng)建數(shù)據(jù)庫對(duì)象private SQLiteDatabase dbWriter;private File phoneFile, videoFile;Overrideprotected void onCreate(Bundle s

37、avedInstanceState) super.onCreate(savedInstanceState);setContentView(R.layout.addcontent);/綁定視圖val = getIntent().getStringExtra(flag);/接收完成savebtn = (Button) findViewById(R.id.save);/尋找iddeletebtn = (Button) findViewById(R.id.delete);ettext = (EditText) findViewById(R.id.ettext);c_img = (ImageView)

38、findViewById(R.id.c_img);v_video = (VideoView) findViewById(R.id.c_video);savebtn.setOnClickListener(this);/監(jiān)聽事件deletebtn.setOnClickListener(this);notesDB = new NotesDB(this);/實(shí)例化dbWriter = notesDB.getWritableDatabase();initView();/判斷是否顯示public void initView() if (val.equals(1) / 文字c_img.setVisibili

39、ty(View.GONE);/隱藏v_video.setVisibility(View.GONE);/隱藏if (val.equals(2) /圖片c_img.setVisibility(View.VISIBLE);/顯示v_video.setVisibility(View.GONE);/隱藏Intent iimg = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);/跳轉(zhuǎn)到系統(tǒng)相機(jī)phoneFile = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + / +

40、getTime() + .jpg);/獲取SD卡絕對(duì)路徑，照片儲(chǔ)存在SD卡中，數(shù)據(jù)庫中只存儲(chǔ)路徑iimg.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(phoneFile);/存儲(chǔ)獲取的圖片信息startActivityForResult(iimg, 1);/啟動(dòng)跳轉(zhuǎn)if (val.equals(3) c_img.setVisibility(View.GONE);/隱藏v_video.setVisibility(View.VISIBLE);/顯示Intent video = new Intent(MediaStore.ACTION_VIDEO_C

41、APTURE);/跳轉(zhuǎn)到手機(jī)系統(tǒng)信息videoFile = new File(Environment.getExternalStorageDirectory().getAbsoluteFile() + / + getTime() + .mp4);/獲取SD卡絕對(duì)路徑video.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(videoFile);/存儲(chǔ)獲取的video信息startActivityForResult(video, 2);/啟動(dòng)跳轉(zhuǎn)Overridepublic void onClick(View v) switch (v.getId(

42、) case R.id.save:addDB();/添加數(shù)據(jù)finish();/關(guān)閉當(dāng)前Activitybreak;case R.id.delete:finish();break;/添加數(shù)據(jù)public void addDB() ContentValues cv = new ContentValues();/實(shí)例化cv.put(NotesDB.CONTENT, ettext.getText().toString();/添加內(nèi)容（在輸入框中獲取到的）cv.put(NotesDB.TIME, getTime();/調(diào)用方法獲取時(shí)間并添加cv.put(NotesDB.PATH, phoneFile

43、+ );/將獲取的圖片信息插入數(shù)據(jù)庫中cv.put(NotesDB.VIDEO, videoFile + );/將獲取的vedio信息插入數(shù)據(jù)庫中dbWriter.insert(NotesDB.TABLE_NAME, null, cv);/將上面添加的數(shù)據(jù)插入數(shù)據(jù)庫中/獲取保存文件時(shí)的時(shí)間private String getTime() SimpleDateFormat format = new SimpleDateFormat(yyyy年MM月dd日 HH:mm:ss);Date curDate = new Date();String str = format.format(curDate)

44、;/按指定的格式獲取時(shí)間return str;Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) / TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);if (requestCode = 1) /圖片Bitmap bitmap = BitmapFactory.decodeFile(phoneFile.getAbsolutePath();/獲取路徑c_img.

45、setImageBitmap(bitmap);/展示內(nèi)容if (requestCode = 2) /視頻v_video.setVideoURI(Uri.fromFile(videoFile);/加載視頻v_video.start();/播放視頻MyAdapter.javapackage com.liwenhuan.notepad;public class MyAdapter extends BaseAdapter private Context context;private Cursor cursor;private LinearLayout layout;/視圖對(duì)象/構(gòu)造方法public

46、MyAdapter(Context context, Cursor cursor) this.context = context;this.cursor = cursor;Overridepublic int getCount() return cursor.getCount();/返回長度Overridepublic Object getItem(int position) return cursor.getPosition();Overridepublic long getItemId(int position) / TODO Auto-generated method stubretur

47、n position;public View getView(int position, View convertView, ViewGroup parent) LayoutInflater inflater = LayoutInflater.from(context);/加載試圖的權(quán)限layout = (LinearLayout) inflater.inflate(R.layout.cell, null);/布局文件TextView contenttv = (TextView) layout.findViewById(R.id.list_content);/獲取上條布局文件中的每一個(gè)內(nèi)容Te

48、xtView timetv = (TextView) layout.findViewById(R.id.list_time);/顯示時(shí)間ImageView imgiv = (ImageView) layout.findViewById(R.id.list_img);/顯示圖片ImageView videoiv = (ImageView) layout.findViewById(R.id.list_video);/顯示視頻cursor.moveToPosition(position);/查詢String content = cursor.getString(cursor.getColumnInd

49、ex(content);/承載查詢到的具體內(nèi)容String time = cursor.getString(cursor.getColumnIndex(time);/獲取時(shí)間String url = cursor.getString(cursor.getColumnIndex(path);/獲取圖片的縮略圖String urlvideo = cursor.getString(cursor.getColumnIndex(video);/獲取視頻contenttv.setText(content);/將內(nèi)容傳遞進(jìn)來timetv.setText(time);/將時(shí)間傳遞進(jìn)來videoiv.setIm

50、ageBitmap(getVideoThumbnail(urlvideo, 200, 200,MediaStore.Images.Thumbnails.MICRO_KIND);/在列表顯示視頻縮略圖imgiv.setImageBitmap(getImageThumbnail(url, 200, 200);/在列表顯示圖片縮略圖return layout;/獲取圖片的縮略圖public Bitmap getImageThumbnail(String uri, int width, int height) Bitmap bitmap = null;BitmapFactory.Options opt

51、ions = new BitmapFactory.Options();options.inJustDecodeBounds = true;bitmap = BitmapFactory.decodeFile(uri, options);options.inJustDecodeBounds = false;int beWidth = options.outWidth / width;int beHeight = options.outHeight / height;int be = 1;if (beWidth beHeight) be = beWidth; else be = beHeight;if (be = 0) be = 1;options.inSampleSize = be;bitmap = BitmapFactory.decodeFile(uri, options);bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height,ThumbnailUtils.OPTIONS_RECYCLE_INPUT);return bitmap;/獲取視頻的縮略圖private Bitmap getVideoThumbnail(String uri, int width, int height, i