用户第一次拖动widget到桌面上，不用授权提示，直接安装

来源：互联网发布：四大名捕知乎编辑：程序博客网时间：2024/05/18 10:21

做sp31项目时测试这边提出一个要求，

手机添加小部件时弹出对话框"是否允许launcher3创建小部件并查看其数据"，建议去除该对话框

看了两天代码，结果只要加一行代码就能解决问题了。解决方法如下：

在Launcher.java里函数

   void addAppWidgetFromDrop(PendingAddWidgetInfo info, long container, long screenId,            int[] cell, int[] span, int[] loc) {        if (LauncherLog.DEBUG) {            LauncherLog.d(TAG, "addAppWidgetFromDrop: info = " + info + ", container = " + container + ", screenId = "                    + screenId);        }        resetAddInfo();        mPendingAddInfo.container = info.container = container;        mPendingAddInfo.screenId = info.screenId = screenId;        mPendingAddInfo.dropPos = loc;        mPendingAddInfo.minSpanX = info.minSpanX;        mPendingAddInfo.minSpanY = info.minSpanY;        if (cell != null) {            mPendingAddInfo.cellX = cell[0];            mPendingAddInfo.cellY = cell[1];        }        if (span != null) {            mPendingAddInfo.spanX = span[0];            mPendingAddInfo.spanY = span[1];        }        AppWidgetHostView hostView = info.boundWidget;        int appWidgetId;        if (hostView != null) {            appWidgetId = hostView.getAppWidgetId();            addAppWidgetImpl(appWidgetId, info, hostView, info.info);        } else {            // In this case, we either need to start an activity to get permission to bind            // the widget, or we need to start an activity to configure the widget, or both.            appWidgetId = getAppWidgetHost().allocateAppWidgetId();            Bundle options = info.bindOptions;            boolean success = false;            mAppWidgetManager.setBindAppWidgetPermission(this.getPackageName(), true);   //txk add             if (options != null) {                success = mAppWidgetManager.bindAppWidgetIdIfAllowed(appWidgetId,                        info.componentName, options);            } else {                success = mAppWidgetManager.bindAppWidgetIdIfAllowed(appWidgetId,                        info.componentName);            }                       if (success) {                addAppWidgetImpl(appWidgetId, info, null, info.info);            } else {                /* 当用户第一次添加widget的时候会走到这里，弹出一个提示框让用户授权。为了不让代码走到这里，只要在                 * mAppWidgetManager.bindAppWidgetIdIfAllowed(……)之前提前授权就好了。添加一行授权代码                 *                  * mAppWidgetManager.setBindAppWidgetPermission(this.getPackageName(), true);                     *                 * 但是需要在Launcher3的AndroidManifest.xml里添加相应权限                 * <uses-permission android:name="android.permission.MODIFY_APPWIDGET_BIND_PERMISSIONS"/>                 * 而这个权限是系统级权限，所以还需要把Launcher3改为系统级应用，在AndroidManifest.xml添加                 *  android:sharedUserId="android.uid.system" 这个标签                 *  还需要在Android.mk里 把LOCAL_CERTIFICATE := shared 改为LOCAL_CERTIFICATE := platform                 */                                mPendingAddWidgetInfo = info.info;                Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_BIND);                intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);                intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_PROVIDER, info.componentName);                // TODO: we need to make sure that this accounts for the options bundle.                // intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_OPTIONS, options);                startActivityForResult(intent, REQUEST_BIND_APPWIDGET);            }        }    }

AndroidManifest.xml

<manifest    xmlns:android="http://schemas.android.com/apk/res/android"    package="com.android.launcher3"    android:sharedUserId="android.uid.system" >    <uses-sdk android:targetSdkVersion="21" android:minSdkVersion="16"/>     ………………    <!-- xuankai.tang add 2015.5.20 start-->     <uses-permission android:name="android.permission.MODIFY_APPWIDGET_BIND_PERMISSIONS"/>    <!-- xuankai.tang add 2015.5.20 end -->    ………………</manifest>

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