我有一个应用程序,它有2个活动。
<activity android:name=".LauncherActivity"
android:theme="@style/LauncherTheme"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name="MainActivity"
android:launchMode="singleTop"
android:screenOrientation="portrait"/>
1.(我预料到)
通过命令行安装应用程序(adb install -r app)
点击应用图标将其打开,LauncherActivity显示,然后我将startActivity指向MainActivity,MainActivity显示。
点击HOME,然后再次点击应用程序图标,再次显示MainActivity。
2.(异常?)
通过packageinstaller安装应用程序。
完成安装后,点击packageinstaller中的“打开”按钮,LauncherActivity显示,然后我将startActivity设置为MainActivity,MainActivity显示。
点击HOME,然后再次点击应用程序图标,LauncherActivity再次显示!!
在我的LauncherActivity中
private void startMainActivity() {
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
}
我通过mLaunchIntent
查看源代码,packageinstaller启动活动InstallAppProgress.java
mLaunchIntent = getPackageManager().getLaunchIntentForPackage(mAppInfo.packageName);
ApplicationPackageManager.java
@Override
public Intent getLaunchIntentForPackage(String packageName) {
// First see if the package has an INFO activity; the existence of
// such an activity is implied to be the desired front-door for the
// overall package (such as if it has multiple launcher entries).
Intent intentToResolve = new Intent(Intent.ACTION_MAIN);
intentToResolve.addCategory(Intent.CATEGORY_INFO);
intentToResolve.setPackage(packageName);
List<ResolveInfo> ris = queryIntentActivities(intentToResolve, 0);
// Otherwise, try to find a main launcher activity.
if (ris == null || ris.size() <= 0) {
// reuse the intent instance
intentToResolve.removeCategory(Intent.CATEGORY_INFO);
intentToResolve.addCategory(Intent.CATEGORY_LAUNCHER);
intentToResolve.setPackage(packageName);
ris = queryIntentActivities(intentToResolve, 0);
}
if (ris == null || ris.size() <= 0) {
return null;
}
Intent intent = new Intent(intentToResolve);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setClassName(ris.get(0).activityInfo.packageName, ris.get(0).activityInfo.name);
return intent;
}
我没有信息活动,因此意图是:
Intent intentToResolve = new Intent(Intent.ACTION_MAIN);
intentToResolve.addCategory(Intent.CATEGORY_LAUNCHER);
intentToResolve.setPackage(packageName);
我很困惑。为什么会有不同的行为?救命啊!
答案 0 :(得分:0)
不确定这对您来说是否仍然是一个问题,但我通过将其包含在我的MainActivity中解决了这个问题:
if (!isTaskRoot()) {
final Intent intent = getIntent();
if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) && Intent.ACTION_MAIN.equals(intent.getAction())) {
finish();
return;
}
}
这是因为根据应用程序的启动方式会触发不同的意图(通过安装屏幕打开vs打开vs启动器)。