java - 如何使应用程序图标从主屏幕隐藏

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该项目的要求如下。应用程序的唯一任务是运行后台服务并与服务器同步数据或将一些信息上传到服务器也可能是一些通知。所以我想做的是以编程方式使该应用程序在部署中不可见。任何人有线索请与我分享。也许它会显示在应用程序管理器中，但不应显示在主屏幕上。

package com.example.drawpicdemo;

导入java.util.ArrayList;导入java.util.List;

导入android.app.ActionBar.LayoutParams；导入 android.app.Activity；导入 android.content.pm.PackageManager；导入 android.graphics.Color;导入 android.os.Bundle；导入 android.view.Menu；导入 android.view.MenuItem;导入 android.view.MotionEvent;导入 android.view.View；导入 android.view.View.OnClickListener;导入 android.view.View.OnTouchListener;导入 android.widget.AdapterView;导入 android.widget.AdapterView.OnItemSelectedListener;导入 android.widget.ArrayAdapter;导入 android.widget.Button;导入 android.widget.EditText;导入 android.widget.RelativeLayout;导入 android.widget.Spinner;

公共(public)类 MainActivity 扩展 Activity 实现 OnClickListener{

Button red, green, blue, yellow, black;
int color = Color.RED;
DrawPictureView view;
public int StdStrokeWidth = 5;
Button EraseBtn, AddTextbtn;
Spinner sizespinner;
RelativeLayout parentlaLayout;
int dx, dy;

String textValue = "";
int lefttext = 0;
int toptext = 0;
int righttext = 0;
int bootomtext = 0;


public MainActivity() {
    // TODO Auto-generated constructor stub
    System.out.println("1111111111");
    System.out.println("1111111111");
    System.out.println("1111111111");
    System.out.println("1111111111");
}


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    text = new EditText(MainActivity.this.getApplicationContext());


    System.out.println("1111111111");

    System.out.println("1111111111");
    //To hide the app icon
    PackageManager p = getPackageManager();
    p.setComponentEnabledSetting(getComponentName(), PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
    System.out.println("1111111111");


    parentlaLayout = (RelativeLayout)findViewById(R.id.parentview);

    EraseBtn = (Button)findViewById(R.id.erase);
    AddTextbtn = (Button)findViewById(R.id.addtext);

    EraseBtn.setOnClickListener(this);
    AddTextbtn.setOnClickListener(this);

    red = (Button) findViewById(R.id.red);
    green = (Button)findViewById(R.id.green);
    blue = (Button)findViewById(R.id.blue);
    yellow = (Button)findViewById(R.id.yellow);
    black = (Button)findViewById(R.id.black);

    red.setBackgroundColor(Color.RED);
    green.setBackgroundColor(Color.GREEN);
    blue.setBackgroundColor(Color.BLUE);
    yellow.setBackgroundColor(Color.YELLOW);
    black.setBackgroundColor(Color.BLACK);

    red.setOnClickListener(this);
    green.setOnClickListener(this);
    blue.setOnClickListener(this);
    yellow.setOnClickListener(this);
    black.setOnClickListener(this);

    view = new DrawPictureView(MainActivity.this.getApplicationContext());
    view.setDrawColor(color);
    RelativeLayout parentView = (RelativeLayout)findViewById(R.id.drawview);
    RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);

    parentView.addView(view, lp);

    sizespinner = (Spinner)findViewById(R.id.sizespinner);
    addItemsOnSpinner2();

    sizespinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            // TODO Auto-generated method stub

                sizespinner.getSelectedItem();
                StdStrokeWidth = Integer.parseInt((String)sizespinner.getSelectedItem());
                view.setStrokeWidth(StdStrokeWidth);
                //sizespinner.setVisibility(View.INVISIBLE);
                shouldClose = true;

        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub

        }
    });

    text.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            // TODO Auto-generated method stub
                final int X = (int) event.getRawX();
                final int Y = (int) event.getRawY();

                switch (event.getAction() & MotionEvent.ACTION_MASK) {
                    case MotionEvent.ACTION_DOWN:

                        RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) text.getLayoutParams();
                        dx = X - lParams.leftMargin;
                        dy = Y - lParams.topMargin;
                        break;

                    case MotionEvent.ACTION_MOVE:

                        RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) text.getLayoutParams();
                        layoutParams.leftMargin = X - dx;
                        layoutParams.topMargin = Y - dy;
                        layoutParams.rightMargin = -250;
                        layoutParams.bottomMargin = -250;
                        text.setLayoutParams(layoutParams);

                        lefttext = layoutParams.leftMargin;
                        toptext = layoutParams.topMargin;
                        righttext = layoutParams.rightMargin;
                        bootomtext = layoutParams.bottomMargin;

                        textValue = text.getText().toString();

                        break;
                }
            return false;
        }
    });

    text.setFocusable(true);

    RelativeLayout.LayoutParams lptext = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
    parentlaLayout.addView(text, lptext);
    text.setVisibility(View.INVISIBLE);


}

boolean shouldClose = false;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
    // TODO Auto-generated method stub
     switch (item.getItemId()) {
       case R.id.action_settings:
           shouldClose = false;
                addItemsOnSpinner2();
            break;

            default:
             break;
         }
        return super.onMenuItemSelected(featureId, item);
      }

      // add items into spinner dynamically
      public void addItemsOnSpinner2() {
        List<String> list = new ArrayList<String>();

        for (int i = 8; i < 48; i++) {
            list.add(Integer.toString(i));
        }

        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, list);
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        sizespinner.setAdapter(dataAdapter);
        sizespinner.setVisibility(View.VISIBLE);
  }

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {
    case R.id.red:
        color = Color.RED;
        view.setDrawColor(color);
        view.setStrokeWidth(StdStrokeWidth);
        break;
    case R.id.blue:
        color = Color.BLUE;
        view.setDrawColor(color);
        view.setStrokeWidth(StdStrokeWidth);
        break;

    case R.id.green:
        color = Color.GREEN;
        view.setDrawColor(color);
        view.setStrokeWidth(StdStrokeWidth);
        break;

    case R.id.yellow:
        color = Color.YELLOW;
        view.setDrawColor(color);
        view.setStrokeWidth(StdStrokeWidth);
        break;

    case R.id.black:
        color = Color.BLACK;
        view.setDrawColor(color);
        view.setStrokeWidth(StdStrokeWidth);
        break;
    case R.id.erase:
        color = Color.WHITE;
        view.setDrawColor(color);
        view.setStrokeWidth(StdStrokeWidth + 50);
        break;
    case R.id.addtext:

        if(AddTextbtn.getText().toString().equals("Add text"))
        {
            text.setVisibility(View.VISIBLE);
            text.setHint("Add text here");
            AddTextbtn.setText("Done");
        }else
        {
            text.setVisibility(View.INVISIBLE);
            AddTextbtn.setText("Add text");

            int []pos = new int[]{lefttext, toptext, righttext, bootomtext};
            view.setTextPosition(pos, textValue);
        }

        break;
    default:
        break;
    }
}

EditText text ;

}

Answer 1

输入以下代码，启动器图标将不可见。

PackageManager p = getPackageManager();
        p.setComponentEnabledSetting(getComponentName(), PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);

将以上代码放入主屏幕的 onCreate() 方法中。