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Android系统开发
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如果在Android设备上又安装了一个Launcher应用，当我们返回主页的时候，Android就会弹出一个弹窗，要用户 选择要启动的Launcher应用，如下图所示： 这个是普通Android设备的正常流程，现在我们的需求是不再显示这个提示窗，在设置中增加一个选择默认启动Launcher的页面，默认选择Launcher3。 Settings在设置中增加一个这样的页面，显示所有声明了"android.intent.category.HOME"的应用 private fun getAllLauncherApps(): MutableList { val list = ArrayList() val launchIntent = Intent(Intent.ACTION_MAIN, null) .addCategory(Intent.CATEGORY_HOME) val intents = packageManager.queryIntentActivities(launchIntent, 0) //遍历 for (ri in intents) { //得到包名 val packageName = ri.activityInfo.applicationInfo.packageName if (packageName == "com.android.settings") { //不显示原生设置 continue } //得到图标 val icon = ri.loadIcon(packageManager) //得到应用名称 val appName = ri.loadLabel(packageManager).toString() //封装应用信息对象 val appInfo = AppInfo(icon, appName, packageName) //添加到list list.add(appInfo) } return list }使用PackageManager提供的queryIntentActivities方法就可以获取所有Launcher应用，原生设置中也有Activity声明了HOME属性，在这里就把它屏蔽掉。 默认选择Launcher3应用为默认启动 private val DEFAULT_LAUNCHER = "my_default_launcher" defaultLauncher = Settings.Global.getString(contentResolver, DEFAULT_LAUNCHER) if (defaultLauncher.isNullOrEmpty()) { defaultLauncher = "com.android.launcher3" Settings.Global.putString(contentResolver, DEFAULT_LAUNCHER, defaultLauncher) }当选择另一个应用，就把选择应用的包名设置到 Settings.Global中。 这样应用选择页面完成，也设置了一个全局的参数提供给系统。 启动最开始提到了Launcher选择弹窗，我们就考虑在这里做点事，把弹窗的逻辑给跳过，就可以实现默认启动。 弹窗源码位于frameworks/base/core/java/com/android/internal/app/ResolverActivity.java 在这里就不具体分析源码了，就看关键部分 public boolean configureContentView(List payloadIntents, Intent[] initialIntents, List rList, boolean alwaysUseOption) { // The last argument of createAdapter is whether to do special handling // of the last used choice to highlight it in the list. We need to always // turn this off when running under voice interaction, since it results in // a more complicated UI that the current voice interaction flow is not able // to handle. mAdapter = createAdapter(this, payloadIntents, initialIntents, rList, mLaunchedFromUid, alwaysUseOption && !isVoiceInteraction()); final int layoutId; if (mAdapter.hasFilteredItem()) { layoutId = R.layout.resolver_list_with_default; alwaysUseOption = false; } else { layoutId = getLayoutResource(); } mAlwaysUseOption = alwaysUseOption; int count = mAdapter.getUnfilteredCount(); if (count == 1 && mAdapter.getOtherProfile() == null) { // Only one target, so we're a candidate to auto-launch! final TargetInfo target = mAdapter.targetInfoForPosition(0, false); if (shouldAutoLaunchSingleChoice(target)) { safelyStartActivity(target); mPackageMonitor.unregister(); mRegistered = false; finish(); return true; } } if (count > 0) { // add by liuwei,if set my_default_launcher,start default String defaultlauncher = Settings.Global.getString(this.getContentResolver(), "my_default_launcher"); final TargetInfo defaultTarget = mAdapter.targetInfoForDefault(defaultlauncher); if(defaultTarget != null){ safelyStartActivity(defaultTarget); mPackageMonitor.unregister(); mRegistered = false; finish(); return true; } //end setContentView(layoutId); mAdapterView = (AbsListView) findViewById(R.id.resolver_list); onPrepareAdapterView(mAdapterView, mAdapter, alwaysUseOption); } else { setContentView(R.layout.resolver_list); final TextView empty = (TextView) findViewById(R.id.empty); empty.setVisibility(View.VISIBLE); mAdapterView = (AbsListView) findViewById(R.id.resolver_list); mAdapterView.setVisibility(View.GONE); } return false; }在configureContentView中判断launcher应用个数，如果为1，则直接启动，finish当前页面。下面判断count>0，我们就在这里面增加自己的逻辑，获取配置的Settings.Global参数，再去Adapter中判断是否有应用包名和参数匹配，如果有就safelyStartActivity()，关闭弹窗。如果没有匹配包名，就走正常流程，弹窗提示用户。 mAdapter.targetInfoForDefault函数是在 public class ResolveListAdapter extends BaseAdapter中增加函数 public TargetInfo targetInfoForDefault(String myDefault){ if(myDefault == null){ return null; } TargetInfo info = null; for(int i=0;i |
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