是的。另一个用例是当您单击通知时。如果应用程序已经在后台,它将启动一个新实例。
using android:launchMode
<activity android:launchMode = ["standard" | "singleTop" | "singleTask" | "singleInstance"] ../>
所以使用"singleTop"
From the docs https://developer.android.com/guide/components/activities/tasks-and-back-stack:
如果当前任务的顶部已存在该活动的实例,系统将通过调用其 onNewIntent() 方法将 Intent 路由到该实例,而不是创建该活动的新实例。 Activity 可以被实例化多次,每个实例可以属于不同的任务,一个任务可以有多个实例(但前提是位于返回堆栈顶部的 Activity 不是该 Activity 的现有实例)。
请阅读下面的博客文章
http://inthecheesefactory.com/blog/understand-android-activity-launchmode/en http://inthecheesefactory.com/blog/understand-android-activity-launchmode/en
https://www.mobomo.com/2011/06/android-understanding-activity-launchmode/ https://www.mobomo.com/2011/06/android-understanding-activity-launchmode/
编辑:在 OnResume 之前,它将调用 OnActivityResult。和data已被选择。
Intent intent = new Intent();
intent.setType("image/jpeg");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Image From Gallery"),
10000);
@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Uri originalUri = null;
if (resultCode == Activity.RESULT_OK) {
if (requestCode == 10000) {
if (data.getData() != null) {
originalUri = data.getData();
//originaluri is your selected image path.
}}}
以及在我们的应用程序中获取 Intent Filter Action。
void onCreate (Bundle savedInstanceState) {
...
// Get intent, action and MIME type
Intent intent = getIntent();
String action = intent.getAction();
String type = intent.getType();
if (Intent.ACTION_SEND.equals(action) && type != null) {
if ("text/plain".equals(type)) {
handleSendText(intent); // Handle text being sent
} else if (type.startsWith("image/")) {
handleSendImage(intent); // Handle single image being sent
}
}
http://developer.android.com/training/sharing/receive.html http://developer.android.com/training/sharing/receive.html
http://developer.android.com/training/basics/intents/filters.html http://developer.android.com/training/basics/intents/filters.html
或者如果您使用启动模式 - singleTop。只是覆盖新意图.
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
}