Car Launcher (car launcher) is an application for the operating system interface in the car, which provides a user-friendly way to access and manage car entertainment, navigation, communication and other related functions.
Features and functions:
- simple interface
- Large fonts and icons
- navigation function
- Media and Audio Controls
- Bluetooth and phone connection
- vehicle information display
- Extensibility and Personalization
Practical exercise
launcher desktop switching example
The following is a simple sample code that demonstrates how to use Launcher desktop switching in an Android application:
import android.content.ComponentName;
import android.content.Intent;
public class LauncherSwitcher {
public static void switchToDefaultLauncher(Activity activity) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
activity.startActivity(intent);
}
public static void switchToAlternativeLauncher(Activity activity, String packageName, String className) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setComponent(new ComponentName(packageName, className));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
activity.startActivity(intent);
}
}
In the sample code above, the switchToDefaultLauncher method is used to switch back to the default Launcher, and the switchToAlternativeLauncher method is used to switch to another custom Launcher.
To use these methods, in your Activity or Fragment, you can call them like this:
LauncherSwitcher.switchToDefaultLauncher(MainActivity.this);
or:
String packageName = "com.example.customlauncher";
String className = "com.example.customlauncher.CustomLauncherActivity";
LauncherSwitcher.switchToAlternativeLauncher(MainActivity.this, packageName, className);
In this way, you can call the corresponding method in the Android application to switch the desktop launcher as needed. Please note that to use these codes, you need to add the corresponding permissions and declarations in the AndroidManifest.xml file. In addition, for custom Launcher switching, you need to know the package name (packageName) and class name (className) of the custom Launcher.
Note that desktop switching capabilities and behavior depend on the device and the user's installed launcher application. Therefore, these code samples may not work on all devices and launcher applications. For more complex or specific needs, you may need to do more research and customization.
Launcher icon drag and drop code example
The following is a sample code that shows how to implement the drag and drop function of the Launcher icon in an Android application:
import android.annotation.SuppressLint;
import android.content.ClipData;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.view.DragEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
public class MainActivity extends AppCompatActivity {
private ViewGroup launcherLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
launcherLayout = findViewById(R.id.launcher_layout);
// 设置启动器图标可拖拽
enableDragAndDropForLauncherIcons();
}
@SuppressLint("ClickableViewAccessibility")
private void enableDragAndDropForLauncherIcons() {
PackageManager packageManager = getPackageManager();
Intent intent = new Intent(Intent.ACTION_MAIN, null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
List<ResolveInfo> launcherApps = packageManager.queryIntentActivities(intent, 0);
// 遍历启动器应用列表，并为每个应用程序图标添加拖拽和触摸监听器
for (final ResolveInfo launcherApp : launcherApps) {
final View launcherIcon = getLayoutInflater().inflate(R.layout.launcher_icon, launcherLayout, false);
launcherIcon.setTag(launcherApp);
// 设置Touch监听器用于处理拖拽手势
launcherIcon.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
// 创建DragShadowBuilder并启动拖拽
ClipData data = ClipData.newPlainText("", "");
View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(v);
v.startDragAndDrop(data, shadowBuilder, v, 0);
return true;
}
return false;
}
});
// 设置Drag监听器用于接收拖拽事件
launcherIcon.setOnDragListener(new View.OnDragListener() {
@Override
public boolean onDrag(View v, DragEvent event) {
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
// 判断拖拽事件是否允许放置到此View中
if (event.getClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) {
// 高亮显示放置区域
v.setBackgroundColor(Color.LTGRAY);
return true;
}
return false;
case DragEvent.ACTION_DRAG_ENTERED:
// 高亮显示放置区域
v.setBackgroundColor(Color.GREEN);
return true;
case DragEvent.ACTION_DRAG_EXITED:
// 取消高亮显示放置区域
v.setBackgroundColor(Color.LTGRAY);
return true;
case DragEvent.ACTION_DROP:
// 处理拖拽事件
ClipData.Item item = event.getClipData().getItemAt(0);
String packageName = item.getText().toString();
// 启动相应的应用程序
Intent launchIntent = packageManager.getLaunchIntentForPackage(packageName);
if (launchIntent != null) {
MainActivity.this.startActivity(launchIntent);
}
// 取消高亮显示放置区域
v.setBackgroundColor(Color.LTGRAY);
return true;
case DragEvent.ACTION_DRAG_ENDED:
// 取消高亮显示放置区域
v.setBackgroundColor(Color.LTGRAY);
return true;
}
return false;
}
});
launcherLayout.addView(launcherIcon);
}
}
}
In the above code example, we first get the list of launcher applications on the device, and add drag and touch listeners to each application icon. The touch listener handles the initiation of the drag process when the user presses the icon, while the drag listener handles the various stages of the drag event.
Through the setOnTouchListener method, we set an OnTouchListener on the icon. When the user presses the icon, we use the startDragAndDrop method to create a drag operation, and specify a DragShadowBuilder as the visual effect of the drag operation.
Through the setOnDragListener method, we set an OnDragListener on the icon to handle the various stages of the drag event. We set the corresponding interface feedback and processing logic according to the different behaviors of the drag event (such as entering, exiting, releasing, etc.).
Launcher workspace sliding code example
The following is a sample code that shows how to implement the sliding function of the Launcher's workspace (Workspace) in an Android application:
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private ViewPager viewPager;
private WorkspacePagerAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = findViewById(R.id.view_pager);
// 创建和设置适配器
adapter = new WorkspacePagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(adapter);
// 设置页面切换监听器
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
// 页面滚动时的处理（可选）
}
@Override
public void onPageSelected(int position) {
// 页面选中时的处理（可选）
}
@Override
public void onPageScrollStateChanged(int state) {
// 页面滚动状态改变时的处理（可选）
}
});
}
}
In the above code, we first created a ViewPager instance and set a custom adapter WorkspacePagerAdapter. The adapter is responsible for providing the content of each page in the workspace.
Next, we set up a ViewPager.OnPageChangeListener listener, which will trigger the corresponding callback method when the page scrolls, the page is selected, and the page scrolling state changes. You can write your own logic in these callback methods as needed.
This article mainly talks about Launcher technology in vehicle development, which is mainly to develop theme interface. For more technical advances on the vehicle, please refer to the "Technical Manual for Vehicle Development". Click to view the detailed categories.
Summary of experience sharing:
- Needs Analysis: Before starting development, it is crucial to have a deep understanding of the needs and expectations of the target audience. Through user research and research, determine functions and features, and design interfaces and interaction methods that meet user needs.
- UX Design: User experience is a key factor, ensuring that the Launcher interface is clean, intuitive and easy to use. Reasonable layout, clear navigation and operation process can improve user satisfaction and stickiness.
- Development technology selection: choose the technical framework and tools suitable for developing Launcher. Common choices include Android development platform (Java or Kotlin), React Native, etc. The choice is made according to the target platform, development cost and familiarity of the team.
- Function realization: According to the requirements, gradually realize each core function module, such as the main interface of the launcher, application management, search function, personalized settings, etc. Ensure the stability, efficiency and integrity of functions.
- Compatibility and adaptability: Considering the compatibility of different devices and system versions, conduct proper testing and adaptation. Make sure Launcher works well on various devices and provides a consistent user experience.
- Performance optimization: It is very important to optimize the performance of Launcher, including startup speed, response time, memory usage, etc. Adopt appropriate optimization techniques and strategies to improve user experience and overall effectiveness.