有些时候系统里预装了两个电话、桌面这样的应用，开机启动后系统会弹框让你选择使用那一个。
在系统设置中应用和通知里发现有默认应用选项，点进去发现是在 PermissionController 中
默认列表界面
adb shell dumpsys window | findstr mCurrentFocus
mCurrentFocus=Window{ffb6aca u0 com.android.permissioncontroller/com.android.packageinstaller.role.ui.DefaultAppListActivity}
默认应用详情界面
adb shell dumpsys window | findstr mCurrentFocus
mCurrentFocus=Window{d2fceb3 u0 com.android.permissioncontroller/com.android.packageinstaller.role.ui.DefaultAppActivity}
点击 Preference 切换是最终调用的代码走到 setRoleHolderAsUser()
vendor\mediatek\proprietary\packages\apps\PermissionController\src\com\android\packageinstaller\role\ui\ManageRoleHolderStateLiveData.java
public void setRoleHolderAsUser(@NonNull String roleName, @NonNull String packageName,boolean add, int flags, @NonNull UserHandle user, @NonNull Context context) {if (getValue() != STATE_IDLE) {Log.e(LOG_TAG, "Already (tried) managing role holders, requested role: " + roleName+ ", requested package: " + packageName);return;}if (DEBUG) {Log.i(LOG_TAG, (add ? "Adding" : "Removing") + " package as role holder, role: "+ roleName + ", package: " + packageName);}mLastPackageName = packageName;mLastAdd = add;mLastFlags = flags;mLastUser = user;setValue(STATE_WORKING);RoleManager roleManager = context.getSystemService(RoleManager.class);Executor executor = context.getMainExecutor();Consumer<Boolean> callback = successful -> {if (successful) {if (DEBUG) {Log.i(LOG_TAG, "Package " + (add ? "added" : "removed")+ " as role holder, role: " + roleName + ", package: " + packageName);}setValue(STATE_SUCCESS);} else {if (DEBUG) {Log.i(LOG_TAG, "Failed to " + (add ? "add" : "remove")+ " package as role holder, role: " + roleName + ", package: "+ packageName);}setValue(STATE_FAILURE);}};if (add) {roleManager.addRoleHolderAsUser(roleName, packageName, flags, user, executor, callback);} else {roleManager.removeRoleHolderAsUser(roleName, packageName, flags, user, executor,callback);}}
核心方法就是这个，那我们就可以仿照它来了，在 PermissionController 中监听开机广播，直接调用改方法设置默认应用就好。
各默认应用对应的 roleName 如下，改造一下 setRoleHolderAsUser(),传递 roleName 和 packageName
电话
role: android.app.role.DIALER, package: com.android.dialer
短信
role: android.app.role.SMS, package: com.android.mms
主屏幕
role: android.app.role.HOME, package: com.android.launcher3
浏览器
role: android.app.role.BROWSER, package: com.android.browser
vendor\mediatek\proprietary\packages\apps\PermissionController\AndroidManifest.xml
<receiver android:name="com.android.packageinstaller.TemporaryFileManager"android:exported="true"><intent-filter><action android:name="android.intent.action.BOOT_COMPLETED" /></intent-filter></receiver>
vendor\mediatek\proprietary\packages\apps\PermissionController\src\com\android\packageinstaller\TemporaryFileManager.java
package com.android.packageinstaller;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.os.SystemClock;import android.util.Log;import android.content.pm.PackageInfo;import android.content.pm.PackageManager;import com.android.packageinstaller.permission.model.AppPermissionGroup;import com.android.packageinstaller.permission.model.AppPermissions;import com.android.packageinstaller.permission.model.Permission;import com.android.packageinstaller.permission.utils.ArrayUtils;import com.android.packageinstaller.permission.utils.Utils;import java.util.List;import java.io.File;import java.io.IOException;import android.app.role.RoleManager;import android.os.UserHandle;import android.os.Process;import java.util.concurrent.Executor;import java.util.function.Consumer;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;/*** Manages files of the package installer and resets state during boot.*/public class TemporaryFileManager extends BroadcastReceiver {private static final String LOG_TAG = TemporaryFileManager.class.getSimpleName();private void setBootFlag(Context context, int flag){SharedPreferences sharedPreferences = context.getSharedPreferences("boot_CONFIG", Context.MODE_PRIVATE);Editor editor = sharedPreferences.edit();editor.putInt("boot_flag", flag).commit();}private boolean isFirstBoot(Context context){SharedPreferences sharedPreferences = context.getSharedPreferences("boot_CONFIG", Context.MODE_PRIVATE);return sharedPreferences.getInt("boot_flag", 0) == 0;}@Overridepublic void onReceive(Context context, Intent intent) {Log.e("permission", "action==="+ intent.getAction());if (isFirstBoot(context)) {setRoleHolderAsUser(context, "com.android.dialer");setBootFlag(context, 1);}long systemBootTime = System.currentTimeMillis() - SystemClock.elapsedRealtime();File[] filesOnBoot = context.getNoBackupFilesDir().listFiles();if (filesOnBoot == null) {return;}for (int i = 0; i < filesOnBoot.length; i++) {File fileOnBoot = filesOnBoot[i];if (systemBootTime > fileOnBoot.lastModified()) {boolean wasDeleted = fileOnBoot.delete();if (!wasDeleted) {Log.w(LOG_TAG, "Could not delete " + fileOnBoot.getName() + " onBoot");}} else {Log.w(LOG_TAG, fileOnBoot.getName() + " was created before onBoot broadcast was "+ "received");}}}public void setRoleHolderAsUser(Context context, String packageName) {String roleName = "android.app.role.DIALER";boolean add = true;int flags = 0;UserHandle user = Process.myUserHandle();Log.i("permission", (add ? "Adding" : "Removing") + " package as role holder, role: "+ roleName + ", package: " + packageName);RoleManager roleManager = context.getSystemService(RoleManager.class);Executor executor = context.getMainExecutor();Consumer<Boolean> callback = successful -> {if (successful) {Log.d("permission", "Package " + (add ? "added" : "removed")+ " as role holder, role: " + roleName + ", package: " + packageName);} else {Log.d("permission", "Failed to " + (add ? "add" : "remove")+ " package as role holder, role: " + roleName + ", package: "+ packageName);}};roleManager.addRoleHolderAsUser(roleName, packageName, flags, user, executor, callback);Log.i("permission", "addRoleHolderAsUser done");}}
如果觉得《Android10.0(Q) 默认应用设置(电话 短信 浏览器 主屏幕应用）》对你有帮助，请点赞、收藏，并留下你的观点哦！
