回答編集履歴
2
コード整備
test
CHANGED
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@@ -18,12 +18,9 @@
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18
18
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PackageManager manager = getPackageManager();
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19
19
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List<PackageInfo> infoList = manager.getInstalledPackages(PackageManager.GET_ACTIVITIES | PackageManager.GET_SERVICES);
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20
20
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for (PackageInfo info : infoList) {
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21
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-
LaunchItem oLaunchItem = null;
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22
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-
if (manager.getLaunchIntentForPackage(info.packageName)
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21
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+
if (manager.getLaunchIntentForPackage(info.packageName) == null) continue;
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23
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-
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22
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+
if (info.packageName == packageName) continue;
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24
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-
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23
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+
return manager.getLaunchIntentForPackage(packageName).getComponent().getClassName() + "";
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25
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-
}
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26
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-
}
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27
24
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}
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28
25
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return "";
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29
26
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}
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1
コード整備
test
CHANGED
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@@ -1,3 +1,31 @@
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1
1
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`Intent#setClassName`を使用し、パッケージ名とアクティビティ名を指定すれば良いはずです。
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2
2
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ただ、Gmail側のアクティビティ名は把握できていませんので、下記を参考に調査してみてください。
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3
3
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参考: [Android開発 他のアプリを立ち上げるための方法 #アプリ - Qiita](https://qiita.com/xu1718191411/items/25faefe055ebb315d041)
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4
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+
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5
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+
```java
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6
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+
public class MainActivity {
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7
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private final String GMAIL_PACKAGE_NAME = "com.google.android.gm";
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8
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+
@Override public void onCreate (Bundle savedInstanceState) {
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9
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+
String GMAIL_CLASS_NAME = getPackageClassName(GMAIL_PACKAGE_NAME);
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10
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+
if (GMAIL_CLASS_NAME == "") {
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11
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+
// 取得できなかったときのエラー処理
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12
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+
}
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13
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+
Intent intent = new Intent(Intent.ACTION_SENDTO);
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14
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+
intent.setClassName(GMAIL_PACKAGE_NAME, GMAIL_CLASS_NAME);
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15
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+
startActivity(intent);
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16
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+
}
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17
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+
private String getPackageClassName (String packageName) {
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18
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+
PackageManager manager = getPackageManager();
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19
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+
List<PackageInfo> infoList = manager.getInstalledPackages(PackageManager.GET_ACTIVITIES | PackageManager.GET_SERVICES);
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20
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+
for (PackageInfo info : infoList) {
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21
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+
LaunchItem oLaunchItem = null;
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22
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+
if (manager.getLaunchIntentForPackage(info.packageName) != null) {
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23
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+
if (info.packageName == packageName) {
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24
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+
return manager.getLaunchIntentForPackage(packageName).getComponent().getClassName() + "";
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25
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+
}
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26
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+
}
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27
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+
}
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28
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+
return "";
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29
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+
}
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30
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+
}
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31
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+
```
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