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我有一个使用插件系统的应用程序。这些“插件”会发出一条广播消息，然后我的应用程序会接收该消息并使用附加的相关数据来注册该应用程序。

问题是我不知道在任何给定时间在设备上安装了多少插件，所以我不知道要等待多少消息，而且我不知道有什么方法可以检查它是否是最后一条消息发送。

现在我正在通过等待三秒钟的计时器完成来伪装它，允许插件注册三秒钟，但是随着更多插件的开发，这将不是足够的时间。

只有在所有插件都完成注册后，我才能刷新我的 UI？

PanelReceiver.java

package com.t3hh4xx0r.haxlauncher.menu.livepanel;

import java.io.ByteArrayOutputStream;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;

import com.t3hh4xx0r.haxlauncher.DBAdapter;

public class PanelReceiver extends BroadcastReceiver {
    private static final String PANEL_REQUEST = "com.t3hh4xx0r.haxlauncher.PANEL_REQUEST";
    private static final String PANEL_REGISTER = "com.t3hh4xx0r.haxlauncher.PANEL_REGISTER";
    private static final String PANEL_UPDATE = "com.t3hh4xx0r.haxlauncher.PANEL_UPDATE";

    boolean shouldAdd = true;
    @Override
    public void onReceive(Context context, Intent intent) {
        String a = intent.getAction();
        if (a.equals(PANEL_REGISTER)) {
            Bundle b = intent.getExtras();
            String author = b.getString("author_name");
            String plugin = b.getString("plugin_name");
            String packageN = b.getString("package_name");
            String desc = b.getString("description");
            String version = b.getString("version");

            DBAdapter db = new DBAdapter(context);
            db.open();      
            Cursor c = db.getAllPanels();
            if (c.getCount() != 0) {
                while (c.moveToNext()) {
                    if (c.getString(c.getColumnIndex("author")).equals(author) &&
                            c.getString(c.getColumnIndex("package")).equals(packageN)){
                        shouldAdd = false;
                        if (!c.getString(c.getColumnIndex("version")).equals(version)) {
                            db.removePanel(packageN);
                            shouldAdd = true;
                        }               
                    }
                }
            }
            if (shouldAdd) {            
                db.insertPanel(version, author, plugin, packageN, desc, image("ic_launcher", context, packageN), image("screencap", context, packageN));
            }
            db.close();     
        } else if (a.equals(PANEL_UPDATE)) {
            Log.d("UPDATE", "OMFG!");
        }
    }

    public static void requestPanels(Context context) {
        Intent i = new Intent();
        i.setAction(PANEL_REQUEST);
        context.sendBroadcast(i); 
    }

    public byte[] image(String imageName, Context c, String packageN) {
        try {
            Context fC = c.getApplicationContext().createPackageContext(packageN, Context.CONTEXT_IGNORE_SECURITY);
            Resources res = fC.getResources();          
            Bitmap photo = drawableToBitmap(res.getDrawable(res.getIdentifier(imageName, "drawable", packageN)));
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            photo.compress(Bitmap.CompressFormat.PNG, 100, bos);
            return bos.toByteArray();
        } catch (NameNotFoundException e) {
            return null;    
        }  
    };

    public static Bitmap drawableToBitmap (Drawable drawable) {
        if (drawable instanceof BitmapDrawable) {
            return ((BitmapDrawable)drawable).getBitmap();
        }

        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap); 
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        return bitmap;
    }
}

PanelMenuActivity.java

package com.t3hh4xx0r.haxlauncher.menu.livepanel;

import java.util.ArrayList;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.database.Cursor;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;

import com.t3hh4xx0r.haxlauncher.DBAdapter;
import com.t3hh4xx0r.haxlauncher.R;

public class PanelMenuActivity extends Activity {
    ListView lv;
    static ArrayAdapter<String> a;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.panel_menu);

        lv = (ListView) findViewById(R.id.panel_list);
        lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> a, View v, int pos,
                    long id) {
                Intent i = new Intent(v.getContext(), PanelDetails.class);
                Bundle b = new Bundle();
                b.putInt("pos", ((PanelDetailHolder)a.getItemAtPosition(pos)).id);
                i.putExtras(b);
                startActivity(i);
            }           
        });
        GetPanelsTask t = new GetPanelsTask();
        t.execute();
    }

    private ListAdapter buildAdapter(Context c) {
        return new PanelAdapter(this, getPanels(c));
    }

    public ArrayList<PanelDetailHolder> getPanels(Context ctx) {
        ArrayList<PanelDetailHolder> panelArray = new ArrayList<PanelDetailHolder>();       
        DBAdapter db = new DBAdapter(ctx);
        db.open();
        Cursor c = db.getAllPanels();
        while (c.moveToNext()) {
            try{
                 getPackageManager().getApplicationInfo(c.getString(c.getColumnIndex("package")), 0 );
                } catch (NameNotFoundException e){
                    db.removePanel(c.getString(c.getColumnIndex("package")));
                    continue;           
                }
            PanelDetailHolder p = new PanelDetailHolder();
            p.author = c.getString(c.getColumnIndex("author"));
            p.title = c.getString(c.getColumnIndex("name"));
            p.desc = c.getString(c.getColumnIndex("desc"));
            p.version = c.getString(c.getColumnIndex("version"));
            p.id = c.getPosition();
            panelArray.add(p);
        }
        c.close();
        db.close();
        return panelArray;
    }

    @Override
    public boolean onOptionsItemSelected(android.view.MenuItem item) {
        int id = item.getItemId();
        switch (id) {
            case R.id.refresh:
                GetPanelsTask t = new GetPanelsTask();
                t.execute();    
        }
        return false;
    }
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuinflate = new MenuInflater(this);
        menuinflate.inflate(R.menu.panel_menu, menu);
        return true;
    }


    public class GetPanelsTask extends AsyncTask<Object, View, Void> {
        ProgressDialog progressDialog;
        @Override
        protected void onPreExecute() {
            progressDialog= ProgressDialog.show(PanelMenuActivity.this, 
                    "Loading...","Checking for live panels...", true);
            PanelReceiver.requestPanels(PanelMenuActivity.this);

        };      
        @Override
        protected Void doInBackground(Object... params) {
            try {
                Thread.sleep(300);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return null;
        };      
        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            progressDialog.dismiss();
            lv.setAdapter(buildAdapter(PanelMenuActivity.this));        
        }

     }

    class PanelDetailHolder {
        String author;
        String title;
        String desc;
        String version;
        Drawable screenCap;
        Drawable icon;
        int id;
    }
}
4

1 回答 1

0

只有在所有插件都完成注册后，我才能刷新我的 UI？

根据定义，这是不可能的。您需要修改您的插件系统，以便：

  • 您“知道设备上安装了多少插件”，或者
  • 您无需在任何时候等待（甚至真正关心）“设备上安装了多少插件”
于 2012-11-05T21:59:12.897 回答