android 常用代码备份

android 全屏代码

 //无title       requestWindowFeature(Window.FEATURE_NO_TITLE);       //全屏      getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

或使用配置。在当前Activity中使用主题

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

屏目横竖切换、

 //如果是竖排,则改为横排  if(getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)    { setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);   }  //如果是横排,则改为竖排else if(getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {  setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); }

给Activity 添加menu.

 public boolean onCreateOptionsMenu(Menu menu) {        menu.add(0, 0, 0, "关于"); //参数1：组名，参数2：item的值，参数3：排序，参数4：menu展示的值        menu.add(0, 1, 1, "退出");        menu.add(1, 0, 0, "退出");        menu.add(1, 1, 1, "退出");        return super.onCreateOptionsMenu(menu);    }     //菜单响应    public boolean onOptionsItemSelected(MenuItem item) {        super.onOptionsItemSelected(item);                if(item.getGroupId()==1){        switch (item.getItemId()) {case 0:this.finish();break;case 1:this.finish();break;default:break;}        }else{            switch (item.getItemId()) {            case 0:                Toast.makeText(this, "欢迎", Toast.LENGTH_LONG).show();                   break;            case 1:                this.finish();                break;            case 2:            this.finish();            break;            }        }           return true;    }

RatingBar 的使用

<RatingBar     android:id="@+id/ratingBar"     android:numStars="5"     android:rating="1.5"     android:layout_width="wrap_content"     android:layout_height="wrap_content">   </RatingBar>

  RatingBar bar = (RatingBar) this.findViewById(R.id.ratingBar);       bar.setRating(2.5f);        bar.getRating();           bar.setOnRatingBarChangeListener(new OnRatingBarChangeListener(){        @Override            public void onRatingChanged(RatingBar ratingBar, float rating,  boolean fromUser) {        System.out.println("ratingBar:"+ratingBar.getRating());       System.out.println("rating:"+rating);           }        });

效果图：

Tosat 弹出带图片的提示。

Toast toast =Toast.makeText(getApplicationContext(), "用户名不能为空", 0);toast.setGravity(Gravity.CENTER, 0, 0);View toastView = toast.getView();ImageView image = new ImageView(LayoutDemoActivity.this);image.setImageResource(R.drawable.icon1);LinearLayout ll = new LinearLayout(LayoutDemoActivity.this);ll.addView(image);ll.addView(toastView);toast.setView(ll);toast.show();

效果图：

通知：

Intent intent = new Intent(ImageViewActivity.this,OtherActivity.class);PendingIntent contentIntent = PendingIntent.getActivity(ImageViewActivity.this, 0, intent, 0);Notification notify = new Notification();notify.icon=R.drawable.icon1;notify.tickerText="启动otherActivity通知";notify.when=System.currentTimeMillis();notify.defaults=Notification.DEFAULT_SOUND;notify.defaults=Notification.DEFAULT_ALL;notify.setLatestEventInfo(ImageViewActivity.this, "普通通知", "点击查看", contentIntent);NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);manager.notify(0, notify);

检测是否安装内存卡：

    private boolean checkSdcard() {if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){return true;}return false;}

弹出对话框：

   ProgressDialog proDialog = ProgressDialog.show(LoginUserActivity.this,"请稍候","正在登陆...", true, true); 
 proDialog = new ProgressDialog(LoginUserActivity.this); proDialog.setIcon(R.drawable.icon); proDialog.setTitle("ProgressDialog"); proDialog.setMessage("Please wait while loading application list..."); proDialog.setCancelable(false); proDialog.show();  proDialog.dismiss(); 
当程序退出时。结束自己的进程。
android.os.Process.killProcess(android.os.Process.myPid());

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