ComponentName
顾名思义，就是组件名称，通过调用intent.setComponent()方法，我们可以打开另一个应用的Activity或者Service
创建ComponentName 需要两个参数：
（1）第三方应用的包名
（2）要打开的Activity和Service的全名称(包名+类名)
public ComponentName(@NonNull String pkg, @NonNull String cls) {
if (pkg == null) throw new NullPointerException("package name is null");
if (cls == null) throw new NullPointerException("class name is null");
mPackage = pkg;
mClass = cls;
}
- 启动第三方Acitivity
ComponentName chatActivity =new ComponentName("com.feifei.example", "com.feifei.example.ChatActivity");
Intent intent =new Intent();
intent.setComponent(chatActivity);
startActivity(intent);
- 启动第三方Service
ComponentName chatService =new ComponentName("com.feifei.example", "com.feifei.example.ChatService");
Intent intent =new Intent();
intent.setComponent(chatService );
startService(intent);
通过Component启动 系统应用
- 启动媒体库
Intent i = new Intent();
ComponentName comp = new ComponentName("com.android.camera","com.android.camera.GalleryPicker");
i.setComponent(comp);
i.setAction("android.intent.action.VIEW");
startActivity(i);
- 启动相机
Intent mIntent = new Intent();
ComponentName comp = new ComponentName("com.android.camera","com.android.camera.Camera");
mIntent.setComponent(comp);
mIntent.setAction("android.intent.action.VIEW");
startActivity(mIntent);
注意:
- 如果该Activity非应用入口(入口Activity默认android:exported="true")，则需要再清单文件中添加 android:exported="true"。Service也需要添加android:exported="true"。允许外部应用调用。
- 启动第三方app的Activity 的还有另一种方法：intent.setClassName
Intent intent = new Intent();
intent.setClassName("org.cvpcs.android.sensordump","org.cvpcs.android.sensordump.AListSensors");
startActivity(intent);
