launcher修改--获取应用列表launcher源码解析

    来源：http://blog.csdn.net/aomandeshangxiao/article/details/6951161

  在home节面上，当我们点击中间按键的时候，会跳转到一个下图，

在代码中是如何实现的呢？我们来找一下：

mHandleView = (HandleView) findViewById(R.id.all_apps_button);
        mHandleView.setLauncher(this);
        mHandleView.setOnClickListener(this);
        mHandleView.setOnLongClickListener(this);

再看onclick()方法：在onclick方法中，有一下代码

else if (v == mHandleView) {
            if (isAllAppsVisible()) {
                closeAllApps(true);
            } else {
                showAllApps(true);
            }

我们再找一下showAllApps()方法

void showAllApps(boolean animated) {
        mAllAppsGrid.zoom(1.0f, animated);

        ((View) mAllAppsGrid).setFocusable(true);
        ((View) mAllAppsGrid).requestFocus();

        // TODO: fade these two too
        mDeleteZone.setVisibility(View.GONE);
        mHandleView.setVisibility(View.GONE);
        mPreviousView.setVisibility(View.GONE);
        mNextView.setVisibility(View.GONE);
    hotseatLeft.setVisibility(View.GONE);
    hotseatRight.setVisibility(View.GONE);
    }

在上面用到了mAllAppsGrid,我们找一下这个控件：

    private AllAppsView mAllAppsGrid;

        mAllAppsGrid = (AllAppsView)dragLayer.findViewById(R.id.all_apps_view);
        mAllAppsGrid.setLauncher(this);
        mAllAppsGrid.setDragController(dragController);
        ((View) mAllAppsGrid).setWillNotDraw(false); // We don't want a hole punched in our window.
        // Manage focusability manually since this thing is always visible
        ((View) mAllAppsGrid).setFocusable(false);

上面代码是在Launcher.java中的setupview()方法中定义
all_apps_view是在all_app_2d.xml中定义。

你想找到AllApp2D.java中，可以找到mAllAppsGrid使用的方法，如addApps，removeApps，zoom这几个方法：

public void addApps(ArrayList list) {
//        Log.d(TAG, "addApps: " + list.size() + " apps: " + list.toString());

        final int N = list.size();

        for (int i=0; i
            final ApplicationInfo item = list.get(i);
            int index = Collections.binarySearch(mAllAppsList, item,
                    LauncherModel.APP_NAME_COMPARATOR);
            if (index < 0) {
                index = -(index+1);
            }
            mAllAppsList.add(index, item);
        }
        mAppsAdapter.notifyDataSetChanged();
    }

    public void removeApps(ArrayList list) {
        final int N = list.size();
        for (int i=0; i
            final ApplicationInfo item = list.get(i);
            int index = findAppByComponent(mAllAppsList, item);
            if (index >= 0) {
                mAllAppsList.remove(index);
            } else {
                Log.w(TAG, "couldn't find a match for item \"" + item + "\"");
                // Try to recover.  This should keep us from crashing for now.
            }
        }
        mAppsAdapter.notifyDataSetChanged();
    }

     public void zoom(float zoom, boolean animate) {
//        Log.d(TAG, "zooming " + ((zoom == 1.0) ? "open" : "closed"));
        cancelLongPress();

        mZoom = zoom;

        if (isVisible()) {
            getParent().bringChildToFront(this);
            setVisibility(View.VISIBLE);
            mGrid.setAdapter(mAppsAdapter);
            if (animate) {
                startAnimation(AnimationUtils.loadAnimation(getContext(), R.anim.all_apps_2d_fade_in));
            } else {
                onAnimationEnd();
            }
        } else {
            if (animate) {
                startAnimation(AnimationUtils.loadAnimation(getContext(), R.anim.all_apps_2d_fade_out));
            } else {
                onAnimationEnd();
            }
        }
    }

在zoom()方法里面有mGrid.setAdapter(mAppsAdapter)，在构造方法中，给adapter已经赋值。

public AllApps2D(Context context, AttributeSet attrs) {
        super(context, attrs);
        setVisibility(View.GONE);
        setSoundEffectsEnabled(false);

        mAppsAdapter = new AppsAdapter(getContext(), mAllAppsList);
        mAppsAdapter.setNotifyOnChange(false);
    }

那是如何获取应用列表的呢？我们再回到Launcher.java中，在loadHotseats()中：

private void loadHotseats() {
       if (mHotseatConfig == null) {
           mHotseatConfig = getResources().getStringArray(R.array.hotseats);
           if (mHotseatConfig.length > 0) {
               mHotseats = new Intent[mHotseatConfig.length];
               mHotseatLabels = new CharSequence[mHotseatConfig.length];
               mHotseatIcons = new Drawable[mHotseatConfig.length];
           } else {
               mHotseats = null;
               mHotseatIcons = null;
               mHotseatLabels = null;
           }

           TypedArray hotseatIconDrawables = getResources().obtainTypedArray(R.array.hotseat_icons);
           for (int i=0; i
               // load icon for this slot; currently unrelated to the actual activity
               try {
                   mHotseatIcons[i] = hotseatIconDrawables.getDrawable(i);
               } catch (ArrayIndexOutOfBound***ception ex) {
                   Log.w(TAG, "Missing hotseat_icons array item #" + i);
                   mHotseatIcons[i] = null;
               }
           }
           hotseatIconDrawables.recycle();
       }

       PackageManager pm = getPackageManager();
       for (int i=0; i
           Intent intent = null;
           if (mHotseatConfig[i].equals("*BROWSER*")) {
               // magic value meaning "launch user's default web browser"
               // replace it with a generic web request so we can see if there is indeed a default
               String defaultUri = getString(R.string.default_browser_url);
               intent = new Intent(
                       Intent.ACTION_VIEW,
                       ((defaultUri != null)
                           ? Uri.parse(defaultUri)
                           : getDefaultBrowserUri())
                   ).addCategory(Intent.CATEGORY_BROWSABLE);
               // note: if the user launches this without a default set, she
               // will always be taken to the default URL above; this is
               // unavoidable as we must specify a valid URL in order for the
               // chooser to appear, and once the user selects something, that
               // URL is unavoidably sent to the chosen app.
           } else {
               try {
                   intent = Intent.parseUri(mHotseatConfig[i], 0);
               } catch (java.net.URISyntaxException ex) {
                   Log.w(TAG, "Invalid hotseat intent: " + mHotseatConfig[i]);
                   // bogus; leave intent=null
               }
           }

           if (intent == null) {
               mHotseats[i] = null;
               mHotseatLabels[i] = getText(R.string.activity_not_found);
               continue;
           }

           if (LOGD) {
               Log.d(TAG, "loadHotseats: hotseat " + i
                   + " initial intent=["
                   + intent.toUri(Intent.URI_INTENT_SCHEME)
                   + "]");
           }

           ResolveInfo bestMatch = pm.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
           List allMatches = pm.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
           if (LOGD) {
               Log.d(TAG, "Best match for intent: " + bestMatch);
               Log.d(TAG, "All matches: ");
               for (ResolveInfo ri : allMatches) {
                   Log.d(TAG, "  --> " + ri);
               }
           }
           // did this resolve to a single app, or the resolver?
           if (allMatches.size() == 0 || bestMatch == null) {
               // can't find any activity to handle this. let's leave the
               // intent as-is and let Launcher show a toast when it fails
               // to launch.
               mHotseats[i] = intent;

               // set accessibility text to "Not installed"
               mHotseatLabels[i] = getText(R.string.activity_not_found);
           } else {
               boolean found = false;
               for (ResolveInfo ri : allMatches) {
                   if (bestMatch.activityInfo.name.equals(ri.activityInfo.name)
                       && bestMatch.activityInfo.applicationInfo.packageName
                           .equals(ri.activityInfo.applicationInfo.packageName)) {
                       found = true;
                       break;
                   }
               }

               if (!found) {
                   if (LOGD) Log.d(TAG, "Multiple options, no default yet");
                   // the bestMatch is probably the ResolveActivity, meaning the
                   // user has not yet selected a default
                   // so: we'll keep the original intent for now
                   mHotseats[i] = intent;

                   // set the accessibility text to "Select shortcut"
                   mHotseatLabels[i] = getText(R.string.title_select_shortcut);
               } else {
                   // we have an app!
                   // now reconstruct the intent to launch it through the front
                   // door
                   ComponentName com = new ComponentName(
                       bestMatch.activityInfo.applicationInfo.packageName,
                       bestMatch.activityInfo.name);
                   mHotseats[i] = new Intent(Intent.ACTION_MAIN).setComponent(com);

                   // load the app label for accessibility
                   mHotseatLabels[i] = bestMatch.activityInfo.loadLabel(pm);
               }
           }

           if (LOGD) {
               Log.d(TAG, "loadHotseats: hotseat " + i
                   + " final intent=["
                   + ((mHotseats[i] == null)
                       ? "null"
                       : mHotseats[i].toUri(Intent.URI_INTENT_SCHEME))
                   + "] label=[" + mHotseatLabels[i]
                   + "]"
                   );
           }
       }
   }

有点复杂，主要代码其实如下：

 PackageManager pm = getPackageManager();
ResolveInfo bestMatch = pm.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
List allMatches = pm.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);

这样就获取了。下面以一个简单的例子结束，获取在sd卡中安装的程序列表：

private void getSdcardApps(){
        mSdcardAppsList.clear();
        ActivityManager am = (ActivityManager)mLauncher.getSystemService(Activity.ACTIVITY_SERVICE);
        PackageManager pm =mLauncher.getPackageManager();
        List list = pm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
        for (android.content.pm.ApplicationInfo appInfo : list) {
                if((appInfo.flags & android.content.pm.ApplicationInfo.FLAG_EXTERNAL_STORAGE) != 0){
                    for (ApplicationInfo applicationInfo : mAllAppsList) {
                        if(appInfo.packageName.equals(applicationInfo.componentName.getPackageName())){
                            mSdcardAppsList.add(applicationInfo);
                            break;
                        }
                    }
                }
        }
        mAppsAdapter = new AppsAdapter(getContext(), mSdcardAppsList);
        mAppsAdapter.notifyDataSetChanged();
        mGrid.setAdapter(mAppsAdapter);
        text.setVisibility(View.VISIBLE);
        text.setBackgroundResource(R.drawable.tab_mmenu_b3_normal);
    }