Android實(shí)現(xiàn)記事本功能
本文實(shí)例為大家分享了Android實(shí)現(xiàn)記事本功能的具體代碼,供大家參考,具體內(nèi)容如下
實(shí)現(xiàn)功能
1、文本數(shù)據(jù)的存儲(chǔ)
2、圖片數(shù)據(jù)存儲(chǔ)
3、視頻數(shù)據(jù)存儲(chǔ)
4、自定義的Adapter
5、SQlite的創(chuàng)建
6、數(shù)據(jù)listview列表的顯示
demo地址
界面布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <Button android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="文字" /> <Button android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="圖文" /> <Button android:id="@+id/video" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="視頻" /> </LinearLayout> <ListView android:id="@+id/list" android:layout_width="fill_parent" android:layout_height="wrap_content" > </ListView> </LinearLayout>
數(shù)據(jù)庫(kù)創(chuàng)建
public class NotesDB extends SQLiteOpenHelper { public static final String TABLE_NAME = "notes"; public static final String CONTENT = "content"; public static final String PATH = "path"; public static final String VIDEO = "video"; public static final String ID = "_id"; public static final String TIME = "time"; public NotesDB(Context context) { super(context, "notes", null, 1); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL("CREATE TABLE " + TABLE_NAME + " (" + ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + CONTENT + " TEXT NOT NULL," + PATH + " TEXT NOT NULL," + VIDEO + " TEXT NOT NULL," + TIME + " TEXT NOT NULL)"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {} }
數(shù)據(jù)的加載
public class AddContent extends Activity implements OnClickListener { private String val; private Button savebtn, deletebtn; private EditText ettext; private ImageView c_img; private VideoView v_video; private NotesDB notesDB; private SQLiteDatabase dbWriter; private File phoneFile, videoFile; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.addcontent); //主界面點(diǎn)擊Button傳遞過來的數(shù)據(jù) val = getIntent().getStringExtra("flag"); savebtn = (Button) findViewById(R.id.save); deletebtn = (Button) findViewById(R.id.delete); ettext = (EditText) findViewById(R.id.ettext); c_img = (ImageView) findViewById(R.id.c_img); v_video = (VideoView) findViewById(R.id.c_video); savebtn.setOnClickListener(this); deletebtn.setOnClickListener(this); notesDB = new NotesDB(this); dbWriter = notesDB.getWritableDatabase(); initView(); } //判斷存儲(chǔ)的是文字,圖片,還是視頻,啟動(dòng)相對(duì)應(yīng)的控件 public void initView() { if (val.equals("1")) { // 文字 c_img.setVisibility(View.GONE); v_video.setVisibility(View.GONE); } if (val.equals("2")) { c_img.setVisibility(View.VISIBLE); v_video.setVisibility(View.GONE); Intent img = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); phoneFile = new File(Environment.getExternalStorageDirectory() .getAbsoluteFile() + "/" + getTime() + ".jpg"); img.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(phoneFile)); startActivityForResult(img, 1); } if (val.equals("3")) { c_img.setVisibility(View.GONE); v_video.setVisibility(View.VISIBLE); Intent video = new Intent(MediaStore.ACTION_VIDEO_CAPTURE); videoFile = new File(Environment.getExternalStorageDirectory() .getAbsoluteFile() + "/" + getTime() + ".mp4"); video.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(videoFile)); startActivityForResult(video, 2); } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.save: addDB(); finish(); break; case R.id.delete: finish(); break; } } //存儲(chǔ)數(shù)據(jù) public void addDB() { ContentValues cv = new ContentValues(); cv.put(NotesDB.CONTENT, ettext.getText().toString()); cv.put(NotesDB.TIME, getTime()); cv.put(NotesDB.PATH, phoneFile + ""); cv.put(NotesDB.VIDEO, videoFile + ""); dbWriter.insert(NotesDB.TABLE_NAME, null, cv); } //時(shí)間的顯示 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); return str; } //完成數(shù)據(jù)拍攝后直接顯示數(shù)據(jù) @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == 1) { Bitmap bitmap = BitmapFactory.decodeFile(phoneFile .getAbsolutePath()); c_img.setImageBitmap(bitmap); } if (requestCode == 2) { v_video.setVideoURI(Uri.fromFile(videoFile)); v_video.start(); } } }
自定義Adapter
public class MyAdapter extends BaseAdapter { private Context context; private Cursor cursor; private LinearLayout layout; public MyAdapter(Context context, Cursor cursor) { this.context = context; this.cursor = cursor; } @Override public int getCount() { return cursor.getCount(); } @Override public Object getItem(int position) { return cursor.getPosition(); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = LayoutInflater.from(context); layout = (LinearLayout) inflater.inflate(R.layout.cell, null); TextView contenttv = (TextView) layout.findViewById(R.id.list_content); TextView timetv = (TextView) layout.findViewById(R.id.list_time); ImageView imgiv = (ImageView) layout.findViewById(R.id.list_img); ImageView videoiv = (ImageView) layout.findViewById(R.id.list_video); cursor.moveToPosition(position); String content = cursor.getString(cursor.getColumnIndex("content")); String time = cursor.getString(cursor.getColumnIndex("time")); String url = cursor.getString(cursor.getColumnIndex("path")); String urlvideo = cursor.getString(cursor.getColumnIndex("video")); contenttv.setText(content); timetv.setText(time); imgiv.setImageBitmap(getImageThumbnail(url, 200, 200)); videoiv.setImageBitmap(getVideoThumbnail(urlvideo, 200, 200, MediaStore.Images.Thumbnails.MICRO_KIND)); return layout; } /** ListView 顯示圖片*/ public Bitmap getImageThumbnail(String uri, int width, int height) { Bitmap bitmap = null; BitmapFactory.Options options = 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; } /**視頻縮略圖*/ private Bitmap getVideoThumbnail(String uri, int width, int height, int kind) { Bitmap bitmap = null; bitmap = ThumbnailUtils.createVideoThumbnail(uri, kind); bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS_RECYCLE_INPUT); return bitmap; } }
ListView點(diǎn)擊的詳情頁(yè)顯示與數(shù)據(jù)刪除
public class SelectAct extends Activity implements OnClickListener { private Button s_delete, s_back; private ImageView s_img; private VideoView s_video; private TextView s_tv; private NotesDB notesDB; private SQLiteDatabase dbWriter; /** 點(diǎn)擊item 的詳情頁(yè) 對(duì)數(shù)據(jù)進(jìn)行刪除操作*/ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.select); 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); /**讀寫權(quán)限*/ notesDB = new NotesDB(this); dbWriter = notesDB.getWritableDatabase(); s_back.setOnClickListener(this); s_delete.setOnClickListener(this); //判斷是否存在圖片 if (getIntent().getStringExtra(NotesDB.PATH).equals("null")) { s_img.setVisibility(View.GONE); } else { s_img.setVisibility(View.VISIBLE); } if (getIntent().getStringExtra(NotesDB.VIDEO).equals("null")) { s_video.setVisibility(View.GONE); } else { s_video.setVisibility(View.VISIBLE); } // 設(shè)置需要顯示的圖片 s_tv.setText(getIntent().getStringExtra(NotesDB.CONTENT)); Bitmap bitmap = BitmapFactory.decodeFile(getIntent().getStringExtra( NotesDB.PATH)); s_img.setImageBitmap(bitmap); s_video.setVideoURI(Uri .parse(getIntent().getStringExtra(NotesDB.VIDEO))); s_video.start(); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.s_delete: deleteDate(); finish(); break; case R.id.s_back: finish(); break; } } //數(shù)據(jù)的刪除 public void deleteDate() { dbWriter.delete(NotesDB.TABLE_NAME, "_id=" + getIntent().getIntExtra(NotesDB.ID, 0), null); } }
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
- Android實(shí)現(xiàn)簡(jiǎn)易記事本
- Android實(shí)現(xiàn)記事本小功能
- Android記事本項(xiàng)目開發(fā)
- Android實(shí)現(xiàn)簡(jiǎn)易記事本
- android實(shí)現(xiàn)記事本app
- Android+SQLite數(shù)據(jù)庫(kù)實(shí)現(xiàn)的生詞記事本功能實(shí)例
- Android中實(shí)現(xiàn)記事本動(dòng)態(tài)添加行效果
- Android實(shí)現(xiàn)記事本功能(26)
- Android利用Intent實(shí)現(xiàn)記事本功能(NotePad)
- Android手機(jī)開發(fā)設(shè)計(jì)之記事本功能
相關(guān)文章
android: targetSdkVersion升級(jí)中Only fullscreen activities can r
這篇文章主要給大家介紹了關(guān)于Android target SDK和build tool版本升級(jí)中遇到Only fullscreen activities can request orientation問題的解決方法,文中通過示例代碼介紹的非常詳細(xì),需要的朋友可以參考下2018-09-09Android 7.0 SEAndroid app權(quán)限配置方法
今天小編就為大家分享一篇Android 7.0 SEAndroid app權(quán)限配置方法,具有很好的參考價(jià)值,希望對(duì)大家有所幫助。一起跟隨小編過來看看吧2018-07-07android 開發(fā)中使用okhttp上傳文件到服務(wù)器
在開發(fā)android手機(jī)客戶端,常常會(huì)需要上傳文件到服務(wù)器,使用okhttp會(huì)是一個(gè)很好的選擇,它使用很簡(jiǎn)單,而且運(yùn)行效率也很高,下面小編給大家?guī)砹薬ndroid 開發(fā)中使用okhttp上傳文件到服務(wù)器功能,一起看看吧2018-01-01Android 7.0以上版本實(shí)現(xiàn)應(yīng)用內(nèi)語言切換的方法
本篇文章主要介紹了Android 7.0以上版本實(shí)現(xiàn)應(yīng)用內(nèi)語言切換的方法,小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,也給大家做個(gè)參考。一起跟隨小編過來看看吧2018-02-02Android自定義view實(shí)現(xiàn)滑動(dòng)解鎖效果
這篇文章主要為大家詳細(xì)介紹了Android自定義view實(shí)現(xiàn)滑動(dòng)解鎖效果,文中示例代碼介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們可以參考一下2021-05-05Android中對(duì)xml文件解析的3種方式總結(jié)
這篇文章主要給大家介紹了關(guān)于Android中對(duì)xml文件解析的3種方式,分別是 Dom 、 SAX 和 dom4j,文中通過示例代碼介紹的非常詳細(xì),需要的朋友可以參考借鑒,下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧。2018-02-02Android自定義Camera實(shí)現(xiàn)拍照小功能
這篇文章主要為大家詳細(xì)介紹了Android自定義Camera實(shí)現(xiàn)拍照小功能,文中示例代碼介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們可以參考一下2022-05-05Service與Activity之間的通信(同一進(jìn)程)
這篇文章主要介紹了Service與Activity之間的通信(同一進(jìn)程)的相關(guān)資料,需要的朋友可以參考下2016-03-03