android常用基本代码.docx

身为新手学习安卓往往会特别的迷茫，不知道该学习什么现在提供一些Android在学习的过程当中经常用到的一些语句，以方便大家学习0 android创建按钮Button button = new Button(this);1 android创建输入框EditText editText = new EditText(this);2 android创建文本TextView textView = new TextView(this);3 android设置文本显示内容TextView textView = new TextView(this);textView.setText(hello world!);4 android设置文本背景色TextView textView = new TextView(this);textView.setBackgroundColor(Color.YELLOW);5 android设置文本颜色TextView textView = new TextView(this);textView.setTextColor(Color.YELLOW);6 android设置文本文字大小TextView textView = new TextView(this);textView.setTextSize(18);7 android设置输入框宽度EditText editText = new EditText(this);editText.setWidth(200);8 android设置输入框为密码框EditText editText = new EditText(this);editText.setTransformationMethod(PasswordTransformationMethod.getInstance();9 android设置输入框为密码框（xml配置）android:password=true10 android 提示对话框的使用AlertDialog.Builder builder = new AlertDialog.Builder(this);builder.setTitle(你好);builder.setPositiveButton(OK,this);builder.show();需实现android.content.DialogInterface.OnClickListener接口11 android ListView的使用ListView listView = new ListView(this);ArrayListHashMap list = new ArrayListHashMap();SimpleAdapter adapter = new SimpleAdapter(this,list,R.layout.list,new String标题,new intR.id.TextView01);listView.setAdapter(adapter);listView.setOnItemClickListener(this);然后实现OnItemClickListener接口public void onItemClick(AdapterView parent, View view, int position, long id) 12 android更新ListViewListView listView = new ListView(this);ArrayListHashMap list = new ArrayListHashMap();SimpleAdapter adapter = new SimpleAdapter(this,list,R.layout.list,new String标题,new intR.id.TextView01);listView.setAdapter(adapter);adapter.notifyDataSetChanged();/通知更新ListView13 android创建LinearLayoutLinearLayout layoutParant = new LinearLayout(this);14 android时间设置对话框的使用DatePickerDialog dlg = new DatePickerDialog(this,this,year,month,day);dlg.show();/year month day 均为int型，第二个参数为this时，该类需要implements OnDateSetListener并重写以下方法public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth) 15 android创建FrameLayoutFrameLayout layout = new FrameLayout(this);16 android触发键盘事件layout.setOnKeyListener(this);/需要implements OnKeyListener并重写以下方法public boolean onKey(View v, int keyCode, KeyEvent event) return false;/返回是否销毁该事件以接收新的事件，比如返回true按下时可以不断执行这个方法，返回false则执行一次。17 android触发鼠标事件layout.OnTouchListener(this);/需要implements OnTouchListener并重写以下方法public boolean onTouch(View v, MotionEvent event) return false;/返回是否销毁该事件以接收新的事件，比如返回true按下时可以不断执行这个方法，返回false则执行一次。18 android获得屏幕宽度和高度int width = this.getWindow().getWindowManager().getDefaultDisplay().getWidth();int height =this.getWindow().getWindowManager().getDefaultDisplay().getHeight();19 android布局添加控件LinearLayout layout = new LinearLayout(this);Button button = new Button(this);layout.addView(button);20 android intent实现activit之间跳转Intent intent = new Intent();intent.setClass(this, DestActivity.class);startActivity(intent);21 android intent设置actionIntent intent = new Intent();intent.setAction(intent.ACTION_DIAL);22 android intent设置dataIntent intent = new Intent();intent.setData(Uri.parse(tel:00000000);23 android intent传数据Intent intent = new Intent();intent.putExtra(data, value);/value可以是很多种类型，在接收activity中取出后强制转换或调用相应类型的get函数。24 android intent取数据String value = (String)getIntent().getExtras().get(data);/or String value = getIntent().getExtras().getString(data);25 android利用paint和canvas画图setContentView(new MyView(this);class MyView extends Viewpublic MyView(Context context)super(context);public void onDraw(Canvas canvas)Paint paint = new Paint();/创建画笔paint.setColor(Color.BLUE);/设置画笔颜色 canvas.drawRect(0, 0, 100, 100, paint);/画个正方形，坐标0，0，100，100。26 android新建对话框Dialog dialog = new Dialog(this);dialog.setTitle(test);/设置标题dialog.addContentView(button,new LayoutParams(-1,-1);/添加控件,-1是设置高度和宽度充满布局，-2是按照需要设置宽度高度。dialog.show();27 android取消对话框dialog.cancel();28 android对View类刷新显示view.invalidate();/通过这个调用view的onDraw()函数29 android使用SurfaceView画图setContentView(new MySurfaceView(this);class MySurfaceView extends SurfaceView implements SurfaceHolder.CallbackSurfaceHolder holder;public MySurfaceView(Context context) super(context);holder = getHolder();holder.addCallback(this);class MyThread extends Threadpublic void run() Canvas canvas = holder.lockCanvas(); Paint paint = new Paint();paint.setColor(Color.YELLOW); canvas.drawRect(100, 100, 200, 200, paint);holder.unlockCanvasAndPost(canvas);public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) public void surfaceCreated(SurfaceHolder holder) new MyThread().start();public void surfaceDestroyed(SurfaceHolder holder) 30 android获得控件findViewByIdTextView textView = (TextView) findViewById(R.id.TextView01);31 android十六进制设置画笔颜色Paint paint = new Paint();paint.setColor(0xffffffff);/第一个ff是透明度的设置。32 android获得String.xml中配置的字符串,在activity中直接调用getText(R.string.app_name);33 android去掉应用程序头部requestWindowFeature(Window.FEATURE_NO_TITLE);34 android使用SharedPreferences写入数据代码getSharedPreferences(data, 0).edit().putString(aa,bb).commit();35 android使用SharedPreferences读取数据代码String data = getSharedPreferences(data, 0).getString(item,);/后面的是默认值，没有取到则赋值为，如果不想有默认，可以设置null。36 android继承SQLiteOpenHelperclass MyHelper extends SQLiteOpenHelperpublic MyHelper(Context context, String name, CursorFactory factory,int version) super(context, name, factory, version);public void onCreate(SQLiteDatabase db)db.execSQL(CREATE TABLE IF NOT EXISTS testtable ( +cardno integer primary key, +username varchar, + money integer+);public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)db.execSQL(DROP TABLE IF EXISTS testtable);onCreate(db);37 android利用SQLiteOpenHelper打开数据库MyHelper dbHelper = new MyHelper(this, testtable.db, null, 1);SQLiteDatabase db = dbHelper.getReadableDatabase();/打开只读/或者SQLiteDatabase db = dbHelper.getWritableDatabase();/打开可写38 android查询数据表并显示结果Cursor cursor = db.query(testtable, null, null, null, null, null, null);/db的获得请参见“利用SQLiteOpenHelper打开数据库”while(!cursor.isAfterLast()Log.i(test,cursor.getString(0);cursor.moveToNext();39 android Logcat输出打印测试信息Log.i(TAG,TEST);40 android数据表插入数据ContentValues values = new ContentValues();values.put(username,admin);values.put(money,10000);db.insert(testtable, null, values);41 android使得应用全屏getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); 42 android设置LinearLayout方向为竖layoutParant.setOrientation(LinearLayout.VERTICAL);43 android设置LinearLayout方向为横layoutParant.setOrientation(LinearLayout.HORIZONTAL);44 android数据库更新数据ContentValues values = new ContentValues();values.put(username,admin);values.put(money,10000);db.update(testtable,values,userno=1,null);45 android数据库删除数据db.delete(testtable,userno=1,null);46 android判断sd卡是否存在if(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)Log.i(test,SDCARD exists);elseLog.i(test,SDCARD doesnt exist);47 android创建ImageViewImageView view = new ImageView(this); view.setImageResource(R.drawable.icon);48 android提示信息Toast toast = Toast.makeText(this, hello, Toast.LENGTH_LONG); toast.show();49 android创建单选框以及单选组RadioButton radioButton = new RadioButton(this);RadioButton radioButton2 = new RadioButton(this);radioButton.setText(yes);radioButton2.setText(no);RadioGroup radioGroup = new RadioGroup(this);radioGroup.addView(radioButton);radioGroup.addView(radioButton2);50 android新建播放器MediaPlayer MediaPlayer = new MediaPlayer();51 android媒体播放器使用/创建MediaPlayerMediaPlayer player = new MediaPlayer();/重置MediaPlayerplayer.reset();try /设置要播放的文件的路径 player.setDataSource(/sdcard/1.mp3);/准备播放 player.prepare();catch (Exception e) /开始播放player.start();/设置播放完毕事件player.setOnCompletionListener(new OnCompletionListener()public void onCompletion(MediaPlayer player) /播完一首循环try /再次准备播放 player.prepare();catch (Exception e) player.start(););52 android媒体播放器暂停player.pause();53 android清空cookiesCookieManager.getInstance().removeAllCookie();54 android文本设置粗体TextView textView = new TextView(this);TextPaint textPaint = textView.getPaint();textPaint.setFakeBoldText(true);55 android网络权限配置56 android GL设定背景色gl.glClearColor(0.5f, 0.2f, 0.2f, 1.0f);gl.glClear(GL10.GL_COLOR_BUFFER_BIT);57 android创建GL画布public class My3DView extends GLSurfaceView private GLSurfaceView.Renderer renderer;public My3DView(Context context) super(context);renderer = new My3DRender();setRenderer(renderer);58 android创建复选框CheckBox checkBox = new CheckBox(this);59 android复选框监听选择/取消事件checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener()public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)Log.i(QSR,TEST););60 android创建菜单/重写下面这个函数public boolean onCreateOptionsMenu(Menu menu)super.onCreateOptionsMenu(menu); menu.add(0, 1, 1, test1); menu.add(0, 2, 2, test2); menu.add(0, 3, 3, test3); menu.add(0, 4, 4, test4); return true;61 android处理菜单选择事件public boolean onOptionsItemSelected(MenuItem item)int id = item.getItemId();switch (id)case 1:Log.i(QSR,1);break;case 2:Log.i(QSR,2);break;case 3:Log.i(QSR,3);break;case 4:Log.i(QSR,4);break;default:break;return super.onOptionsItemSelected(item); 62 android允许程序访问GPS(XML配置)63 android允许程序访问GSM网络信息(XML配置)64 android允许程序访问WIFI网络信息(XML配置)65 android允许程序更新电池状态(XML配置)66 android允许程序写短信(XML配置)67 android允许程序设置壁纸(XML配置)68 android允许程序使用蓝牙(XML配置)69 android允许程序打电话(XML配置) 70 android允许程序使用照相设备(XML配置)71 android允许程序改变网络状态(XML配置)72 android允许程序改变WIFI状态(XML配置)73 android允许程序删除缓存文件(XML配置)74 android允许程序删除包(XML配置)75 android允许程序禁用键盘锁(XML配置)76 android允许程序获取任务信息(XML配置)77 android允许程序截获鼠标或键盘等事件(XML配置)78 android允许程序使用socket(XML配置)79 android允许程序读取日历(XML配置)80 android允许程序读取系统日志(XML配置)81 android允许程序读取所有者数据(XML配置)82 android允许程序读取短信(XML配置)83 android允许程序重启设备(XML配置)84 android允许程序录制音频(XML配置)85 android允许程序发送短信(XML配置)86 android允许程序将自己置为最前(XML配置)87 android创建图像图片BitmapResources res = getResources();Bitmap bitmap = BitmapFactory.decodeResource(res, R.drawable.hh);88 android取得远程图片HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();conn.connect();InputStream is = conn.getInputStream();bitmap = BitmapFactory.decodeStream(is);is.close();89 android允许程序发送短信(XML配置)90 android启动和结束服务startService(new Intent(qsr.test.MyService);stopService(new Intent(qsr.test.MyService);91 android创建和配置Servicepublic class MyService extends Service public IBinder onBind(Intent arg0)return null;public void onStart(Intent intent,int startId)super.onStart(intent, startId);/to do something when startpublic void onDestroy()super.onDestroy();/to do something when stop/xml配置92 android获得系统感应设备SensorManager sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE); 93 android设置控件布局参数/高100，宽60，x=0，y=0；textView01.setLayoutParams(new AbsoluteLayout.LayoutParams(100,60,0,0);94 android创建Drawable对象Resources res = getResources();Drawable drawable = res.getDrawable(R.drawable.hh);95 android访问网页Uri uri = Uri.parse();Intent intent = new Intent(Intent.ACTION_VIEW,uri);startActivity(intent);96 android打电话Uri uri = Uri.parse(tel:00000000);Intent intent = new Intent(Intent.ACTION_DIAL, uri); startActivity(intent); 97 android播放歌曲Intent intent = new Intent(Intent.ACTION_VIEW);Uri uri = Uri.parse(file:/sdcard/test.mp3);intent.setDataAndType(uri, audio/mp3);startActivity(intent);98 android发送邮件Intent intent=new Intent(Intent.ACTION_SEND); intent.putExtra(Intent.EXTRA_TEXT, The email text); intent.setType(text/plain); startActivity(Intent.createChooser(intent, Choose Email Client);99 android发短信Uri uri = Uri.parse(smsto:123456789); Intent intent = new Intent(Intent.ACTION_SENDTO, uri); intent.putExtra(sms_body, The SMS text); startActivity(intent);100 android安装程序Uri installUri = Uri.fromParts(package, xxx, null);Intent intent = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri); startActivity(intent);101 android卸载程序Uri uninstallUri = Uri.fromParts(package, xxx, null);Intent intent = new Intent(Intent.ACTION_DELETE, uninstallUri); startActivity(intent);102 android从xml配置获得控件对象/TestActivity.javatextView = (TextView) findViewById(R.id.TextView01);/main.xml103 android获得触摸屏压力public boolean onTouch(View v, MotionEvent event) float pressure = event.getPressure();return false;104 android给文本加上滚动条TextView textView = new TextView(this);textView.setText(string);ScrollView scrollView = new ScrollView(this);scrollView.addView(textView);setContentView(scrollView);105 android获得正在运行的所有服务public void onCreate(Bundle savedInstanceState)super.onCreate(savedInstanceState);StringBuffer serviceInfo = new StringBuffer();ActivityManager activityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);List services = activityManager.getRunningServices(256);Iterator iterator = services.iterator();while (iterator.hasNext()RunningServiceInfo si = (RunningServiceInfo)iterator.next();serviceInfo.append(pid: ).append(si.pid);serviceInfo.append(process: ).append(cess);TextView textView = new TextView(this);textView.setText(serviceInfo.toString();ScrollView scrollView = new ScrollView(this);scrollView.addView(textView);setContentView(scrollView);106 android使用ContentResolver获得联系人姓名和号码ContentResolver cr = getContentResolver();Cursor cur = cr.query(People.CONTENT_URI, null, null, null, null);cur.moveToFirst();doint nameColumn = cur.getColumnIndex(People.NAME);int phoneColumn = cur.getColumnIndex(People.NUMBER);String name = cur.getString(nameColumn);String phoneNumber = cur.getString(phoneColumn);Toast.makeText(this,name,Toast.LENGTH_LONG).show();Toast.makeText(this,phoneNumber,Toast.LENGTH_LONG).show(); while (cur.moveToNext();107 android创建WebViewWebView webView = new WebView(this);webView.loadData(+test+test+, text/html, utf-8);108 android设置地图是否显示卫星和街道mapView.setSatellite(false); mapView.setStreetView(true);109 android单选框清除radioGroup.clearCheck();110 android给文本增加链接Linkify.addLinks(mTextView01,Linkify.WEB_URLS);Linkify.addLinks(mTextView02,Linkify.EMAIL_ADDRESSES);Linkify.addLinks(mTextView03,Linkify.PHONE_NUMBERS);111 android设置手机震动Vibrator vibrator = (Vibrator)getApplication().getSystemService(Service.VIBRATOR_SERVICE);vibrator.vibrate(new long1000,1000,1000,1000,-1);/震动一秒，停一秒，再震一秒112 android创建下拉框Spinner spinner = new Spinner(this);113 android给spinner添加事件spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() public void onItemSelected(AdapterView parent,View view,int position,long id) public void onNo