手电筒部件未关闭 [英] Flashlight widget does not turn off
本文介绍了手电筒部件未关闭的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我创造一切必要为我小部件存在和功能。即便如此在第一次点击，T做的事情应该是后来的图像得到改变，并说问题，不起作用。我希望它打开Flash，然后关闭它。
帮助将非常AP preciated。
FlashlightWidgetProvider
公共类FlashlightWidgetProvider扩展AppWidgetProvider { @覆盖
公共无效的onUpdate（上下文的背景下，AppWidgetManager appWidgetManager，
INT [] appWidgetIds）{ 意图接收器=新意图（背景下，FlashlightWidgetReceiver.class）;
receiver.setAction（COM_FLASHLIGHT）;
receiver.putExtra（AppWidgetManager.EXTRA_APPWIDGET_IDS，appWidgetIds）;
的PendingIntent的PendingIntent = PendingIntent.getBroadcast（上下文，0，接收机，0）; RemoteViews意见=新的RemoteViews（context.getPackageName（）
R.layout.flash_widget）;
views.setOnClickPendingIntent（R.id.button，的PendingIntent）; appWidgetManager.updateAppWidget（appWidgetIds，意见）; }
}
FlashlightWidgetReceiver
公共类FlashlightWidgetReceiver扩展广播接收器{
私有静态布尔isLightOn = FALSE;
私有静态相机摄像头; @覆盖
公共无效的onReceive（上下文的背景下，意图意图）{
RemoteViews意见=新的RemoteViews（context.getPackageName（），R.layout.flash_widget）; 如果（isLightOn）{
views.setImageViewResource（R.id.button，R.drawable.off）;
}其他{
views.setImageViewResource（R.id.button，R.drawable.on）;
} AppWidgetManager appWidgetManager = AppWidgetManager.getInstance（上下文）;
appWidgetManager.updateAppWidget（新组件名（背景下，FlashlightWidgetProvider.class）
意见）; 如果（isLightOn）{
如果（相机！= NULL）{
camera.stop preVIEW（）;
camera.release（）;
摄像头= NULL;
isLightOn = FALSE;
} }其他{
//打开默认即面对镜头第一后部。
相机= Camera.open（）; 如果（相机== NULL）{
Toast.makeText（上下文，R.string.no_camera，Toast.LENGTH_SHORT）.show（）;
}其他{
//设置火炬闪光模式
参数参数= camera.getParameters（）;
param.setFlashMode（Camera.Parameters.FLASH_MODE_TORCH）;
尝试{
camera.setParameters（参数）;
camera.start preVIEW（）;
isLightOn = TRUE;
}赶上（例外五）{
Toast.makeText（上下文，R.string.no_flash，Toast.LENGTH_SHORT）.show（）;
}
}
}
}
}
解决方案
确认按钮资源指的是ImageView的，而不是一个常规的按钮。我只是在我的布局文件试过了这一点，先是用一个按钮，我得到了同样的问题，其中的部件将基本上崩溃，从主屏幕上删除自身。当我改变按钮，在布局文件中的ImageView中，code现在的工作。
我做了修改code从你一点，所以在情况下本身并不工作，这里是更新FlashlightWidgetProvider：
公共类FlashlightWidgetProvider扩展AppWidgetProvider { @覆盖
公共无效的onReceive（上下文的背景下，意图意图）{
如果（AppWidgetManager.ACTION_APPWIDGET_UPDATE.equals（intent.getAction（）））{
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance（上下文）;
INT [] appWidgetIds = appWidgetManager.getAppWidgetIds（新单元名（上下文，的getClass（）））; 意图broadcastIntent =新意图（背景下，FlashlightWidgetReceiver.class）;
broadcastIntent.setAction（COM_FLASHLIGHT）;
broadcastIntent.putExtra（AppWidgetManager.EXTRA_APPWIDGET_IDS，appWidgetIds）;
的PendingIntent的PendingIntent = PendingIntent.getBroadcast（背景下，
0，
broadcastIntent，
PendingIntent.FLAG_UPDATE_CURRENT）; RemoteViews意见=新的RemoteViews（context.getPackageName（），R.layout.flashlight）;
views.setOnClickPendingIntent（R.id.flashButton，的PendingIntent）; appWidgetManager.updateAppWidget（appWidgetIds，意见）;
} super.onReceive（背景下，意图）;
}
}
此外，确保登记清单中的部件供应商和接收机正确（更换课程的相关作品与自己的，）：
＆lt;接收
机器人：名字=com.example.stackoverflowtester.widget.FlashlightWidgetProvider
机器人：标签=手电筒＆GT;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.appwidget.action.APPWIDGET_UPDATE/＆GT;
＆所述; /意图滤光器＆gt; ＆所述;元数据
机器人：名字=android.appwidget.provider
机器人：资源=@ XML / flashlight_widget_provider/＆GT;
＆LT; /接收器＆GT;
＆lt;接收机器人：名字=com.example.stackoverflowtester.widget.FlashlightWidgetReceiver＆GT;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=COM_FLASHLIGHT/＆GT;
＆所述; /意图滤光器＆gt;
＆LT; /接收器＆GT;
I have created everything necessary for my widget to exist and function. Even so at the first click, t does what it is supposed to but then image gets changed and says problem, and does not function. I want it to open flash and then close it. Help will be much appreciated.
FlashlightWidgetProvider
public class FlashlightWidgetProvider extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
Intent receiver = new Intent(context, FlashlightWidgetReceiver.class);
receiver.setAction("COM_FLASHLIGHT");
receiver.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, receiver, 0);
RemoteViews views = new RemoteViews(context.getPackageName(),
R.layout.flash_widget);
views.setOnClickPendingIntent(R.id.button, pendingIntent);
appWidgetManager.updateAppWidget(appWidgetIds, views);
}
}
FlashlightWidgetReceiver
public class FlashlightWidgetReceiver extends BroadcastReceiver {
private static boolean isLightOn = false;
private static Camera camera;
@Override
public void onReceive(Context context, Intent intent) {
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.flash_widget);
if(isLightOn) {
views.setImageViewResource(R.id.button, R.drawable.off);
} else {
views.setImageViewResource(R.id.button, R.drawable.on);
}
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
appWidgetManager.updateAppWidget(new ComponentName(context, FlashlightWidgetProvider.class),
views);
if (isLightOn) {
if (camera != null) {
camera.stopPreview();
camera.release();
camera = null;
isLightOn = false;
}
} else {
// Open the default i.e. the first rear facing camera.
camera = Camera.open();
if(camera == null) {
Toast.makeText(context, R.string.no_camera, Toast.LENGTH_SHORT).show();
} else {
// Set the torch flash mode
Parameters param = camera.getParameters();
param.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
try {
camera.setParameters(param);
camera.startPreview();
isLightOn = true;
} catch (Exception e) {
Toast.makeText(context, R.string.no_flash, Toast.LENGTH_SHORT).show();
}
}
}
}
}
解决方案
Make sure the button resource refers to an ImageView and not a regular Button. I just tried this out at first with a Button in my layout file and I was getting the same problem where the widget would basically crash and remove itself from the home screen. When I changed button to be an ImageView in the layout file, the code now works.
I did modify the code a bit from yours, so in case that doesn't work by itself, here is the updated FlashlightWidgetProvider:
public class FlashlightWidgetProvider extends AppWidgetProvider {
@Override
public void onReceive(Context context, Intent intent) {
if (AppWidgetManager.ACTION_APPWIDGET_UPDATE.equals(intent.getAction())) {
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
int[] appWidgetIds = appWidgetManager.getAppWidgetIds(new ComponentName(context, getClass()));
Intent broadcastIntent = new Intent(context, FlashlightWidgetReceiver.class);
broadcastIntent.setAction("COM_FLASHLIGHT");
broadcastIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
0,
broadcastIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.flashlight);
views.setOnClickPendingIntent(R.id.flashButton, pendingIntent);
appWidgetManager.updateAppWidget(appWidgetIds, views);
}
super.onReceive(context, intent);
}
}
Also, make sure to register the widget provider and receiver correctly in the manifest (replacing the relevant pieces with your own, of course):
<receiver
android:name="com.example.stackoverflowtester.widget.FlashlightWidgetProvider"
android:label="Flashlight" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/flashlight_widget_provider" />
</receiver>
<receiver android:name="com.example.stackoverflowtester.widget.FlashlightWidgetReceiver" >
<intent-filter>
<action android:name="COM_FLASHLIGHT" />
</intent-filter>
</receiver>
这篇关于手电筒部件未关闭的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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