android 常用代码备份

最新推荐文章于 2021-05-26 05:40:08 发布

liuc0317

最新推荐文章于 2021-05-26 05:40:08 发布

阅读量941

点赞数

CC 4.0 BY-SA版权

分类专栏： android 文章标签： android menu layout image application manager

本文链接：https://blog.youkuaiyun.com/liuc0317/article/details/6952768

android 专栏收录该内容

37 篇文章

订阅专栏

本文详细介绍了Android应用如何实现全屏显示、横竖屏切换，并提供了菜单系统的创建、响应及使用方法，同时展示了RatingBar组件的用法、Tosat弹窗提示的制作、通知发送流程以及检测内存卡、弹出对话框的功能实现。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

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());