如何启动一个活动从另一个应用程序在Android

我想从我的Android应用程序启动一个已安装的包。我认为使用意图是可能的,但我没有找到一种方法来做到这一点。有没有链接,在哪里可以找到相关信息?

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如果你知道数据和安装的包的反应,你只需在启动之前将这些信息添加到你的intent实例中。

如果你可以访问其他应用程序的AndroidManifest,你可以在那里看到所有需要的信息。

我找到解决方案了。在应用程序的清单文件中,我找到了包的名称:com.package.address和我想启动的主活动的名称:MainActivity 以下代码启动此应用程序:

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setComponent(new ComponentName("com.package.address","com.package.address.MainActivity"));
startActivity(intent);

如果您不知道主要活动,那么可以使用包名来启动应用程序。

Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.package.address");
if (launchIntent != null) {
startActivity(launchIntent);//null pointer check in case package name was not found
}

我知道这个问题已经得到了回答,但以下是我如何实现类似的东西:

Intent intent = getPackageManager().getLaunchIntentForPackage("com.package.name");
if (intent != null) {
// We found the activity now start the activity
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} else {
// Bring user to the market or let them choose an app?
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + "com.package.name"));
startActivity(intent);
}

更好的方法是:

public void startNewActivity(Context context, String packageName) {
Intent intent = context.getPackageManager().getLaunchIntentForPackage(packageName);
if (intent != null) {
// We found the activity now start the activity
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
} else {
// Bring user to the market or let them choose an app?
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + packageName));
context.startActivity(intent);
}
}

删除重复代码:

public void startNewActivity(Context context, String packageName) {
Intent intent = context.getPackageManager().getLaunchIntentForPackage(packageName);
if (intent == null) {
// Bring user to the market or let them choose an app?
intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("market://details?id=" + packageName));
}
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}

下面是我的例子,如果有人觉得有用,我就从我的应用程序中启动条形码/QR码扫描仪

Intent intent = new Intent("com.google.zxing.client.android.SCAN");
intent.setPackage("com.google.zxing.client.android");


try
{
startActivityForResult(intent, SCAN_REQUEST_CODE);
}
catch (ActivityNotFoundException e)
{
//implement prompt dialog asking user to download the package
AlertDialog.Builder downloadDialog = new AlertDialog.Builder(this);
downloadDialog.setTitle(stringTitle);
downloadDialog.setMessage(stringMessage);
downloadDialog.setPositiveButton("yes",
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialogInterface, int i)
{
Uri uri = Uri.parse("market://search?q=pname:com.google.zxing.client.android");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
try
{
myActivity.this.startActivity(intent);
}
catch (ActivityNotFoundException e)
{
Dialogs.this.showAlert("ERROR", "Google Play Market not found!");
}
}
});
downloadDialog.setNegativeButton("no",
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int i)
{
dialog.dismiss();
}
});
downloadDialog.show();
}

检查应用程序,避免任何崩溃。如果应用程序在手机中存在,那么它将被启动,否则它将在谷歌Play中搜索。如果手机没有安装谷歌Play app,手机会通过浏览器在谷歌Play Store中搜索:

public void onLunchAnotherApp() {
final String appPackageName = getApplicationContext().getPackageName();


Intent intent = getPackageManager().getLaunchIntentForPackage(appPackageName);
if (intent != null) {
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
} else {
onGoToAnotherInAppStore(intent, appPackageName);
}
}


public void onGoToAnotherInAppStore(Intent intent, String appPackageName) {
try {
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + appPackageName));
startActivity(intent);
} catch (android.content.ActivityNotFoundException anfe) {
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("http://play.google.com/store/apps/details?id=" + appPackageName));
startActivity(intent);
}
}

启动新活动的步骤如下:

1.获取包的意图

2.如果意图为空重定向用户到播放商店

3.如果意图不为空,打开活动

public void launchNewActivity(Context context, String packageName) {
Intent intent = null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.CUPCAKE) {
intent = context.getPackageManager().getLaunchIntentForPackage(packageName);
}
if (intent == null) {
try {
intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setData(Uri.parse("market://details?id=" + packageName));
context.startActivity(intent);
} catch (android.content.ActivityNotFoundException anfe) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + packageName)));
}
} else {
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
}
// in onCreate method
String appName = "Gmail";
String packageName = "com.google.android.gm";
openApp(context, appName, packageName);


public static void openApp(Context context, String appName, String packageName) {
if (isAppInstalled(context, packageName))
if (isAppEnabled(context, packageName))
context.startActivity(context.getPackageManager().getLaunchIntentForPackage(packageName));
else Toast.makeText(context, appName + " app is not enabled.", Toast.LENGTH_SHORT).show();
else Toast.makeText(context, appName + " app is not installed.", Toast.LENGTH_SHORT).show();
}


private static boolean isAppInstalled(Context context, String packageName) {
PackageManager pm = context.getPackageManager();
try {
pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
return true;
} catch (PackageManager.NameNotFoundException ignored) {
}
return false;
}


private static boolean isAppEnabled(Context context, String packageName) {
boolean appStatus = false;
try {
ApplicationInfo ai = context.getPackageManager().getApplicationInfo(packageName, 0);
if (ai != null) {
appStatus = ai.enabled;
}
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
return appStatus;
}

如果你想打开另一个应用程序的特定活动,我们可以使用这个。

Intent intent = new Intent(Intent.ACTION_MAIN, null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
final ComponentName cn = new ComponentName("com.android.settings", "com.android.settings.fuelgauge.PowerUsageSummary");
intent.setComponent(cn);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
try
{
startActivity(intent)
}catch(ActivityNotFoundException e){
Toast.makeText(context,"Activity Not Found",Toast.LENGTH_SHORT).show()
}

如果你必须需要其他应用程序,你可以显示一个对话框,而不是显示Toast。使用对话框,你可以把用户带到Play-Store下载所需的应用程序。

根据评论进行编辑

在某些版本中(如注释中建议的那样),抛出的异常可能不同。

因此,下面的解决方案稍作修改

Intent launchIntent = null;
try{
launchIntent = getPackageManager().getLaunchIntentForPackage("applicationId");
} catch (Exception ignored) {}


if(launchIntent == null){
startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse("https://play.google.com/store/apps/details?id=" + "applicationId")));
} else {
startActivity(launchIntent);
}

原来的答案

虽然回答得很好,有一个相当简单的实现来处理如果应用程序没有安装。我这样做

try{
startActivity(getPackageManager().getLaunchIntentForPackage("applicationId"));
} catch (PackageManager.NameNotFoundException e) {
startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse("https://play.google.com/store/apps/details?id=" + "applicationId")));
}

将“applicationId”替换为要打开的包,如com.google。地图等。

private fun openOtherApp() {
val sendIntent = packageManager.getLaunchIntentForPackage("org.mab.dhyanaqrscanner")
startActivity(sendIntent)
finishAffinity()
}

根据文档,可以使用Intent.setClassName来启动应用程序的活动。

一个例子:

val activityName = "com.google.android.apps.muzei.MuzeiActivity" // target activity name
val packageName = "net.nurik.roman.muzei" // target package's name
val intent = Intent().setClassName(packageName, activityName)
startActivity(intent)

要在当前应用程序之外打开它,在开始intent之前添加这个标志。

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)

一个相关的答案在这里

试试下面的代码:

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setComponent(new ComponentName("package_name", "Class_name"));
if (intent.resolveActivity(getPackageManager()) != null)
{
startActivity(intent);
}

由于kotlin现在变得非常流行,我认为在kotlin中也提供一个简单的解决方案是合适的。

var launchIntent: Intent? = null
try {
launchIntent = packageManager.getLaunchIntentForPackage("applicationId")
} catch (ignored: Exception) {
}
if (launchIntent == null) {
startActivity(Intent(Intent.ACTION_VIEW).setData(Uri.parse("https://play.google.com/store/apps/details?id=" + "applicationId")))
} else {
startActivity(launchIntent)
}

在芬兰湾的科特林

fun openApplicationOrMarket(packageName: String) {
var intent = requireContext().packageManager.getLaunchIntentForPackage(packageName)
if (intent == null) {
intent = Intent(Intent.ACTION_VIEW)
intent.data = Uri.parse("market://details?id=$packageName")
}


intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
requireContext().startActivity(intent)
}

传递包名和你想要显示的消息,如果包没有安装;-)

void openApp(String appPackageName,String message){
Intent launchIntent = getPackageManager().getLaunchIntentForPackage(appPackageName);
if (launchIntent != null) {
startActivity(launchIntent);
} else {
Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + appPackageName)));
}
}

从API 30 (Android 11)开始,你可以通过launchIntentForPackage接收nullpointerexception

val launchIntent: Intent? = activity.packageManager.getLaunchIntentForPackage("com.google.android.gm")
startActivity(launchIntent)

为了避免这种情况,您需要将所需的包添加到清单中

<queries>
<package android:name="com.google.android.gm" />
</queries>

这里是文档 # EYZ0 < / p >

和媒体文章 # EYZ0 < / p >

这将涵盖所有场景

1.获取包的意图

2.如果意图为空重定向用户到播放商店

3.如果打开playstore存在问题,那么它将在默认浏览器上打开。

var intent = activity!!.packageManager.getLaunchIntentForPackage("com.google.android.youtube")


if (intent == null) {
if (intent == null) {
intent = try {
Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=com.google.android.youtube"))
} catch (e: Exception) {
Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=com.google.android.youtube"))
}
}
startActivity(intent)

对于Android 11 (API级别30)或更高,在AndroidManifest.xml中,

<queries>
<package android:name="com.google.android.youtube" />
<package android:name="com.example.app" />
</queries>

或者我们可以允许所有的包(不推荐)

<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" tools:ignore="QueryAllPackagesPermission" />

参考文献

Android上的包可见性过滤

声明包可见性需要