Android-在主屏幕上创建小部件
我想从url加载图像,以及图像下方显示的文本。像这样,Android-在主屏幕上创建小部件,android,android-layout,widget,android-imageview,Android,Android Layout,Widget,Android Imageview,我想从url加载图像,以及图像下方显示的文本。像这样, 在ImageView和TextView上对齐,这是我的代码,但没有显示所需的布局 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:lay
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FFFF"
android:padding="0.1dp">
<TextView android:text="@string/widgetUrl"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.8"
android:layout_gravity="center_vertical"
android:textColor="#000000">
</TextView>
<TextView android:text="@string/widgetTitle"
android:id="@+id/widgetTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.8"
android:layout_gravity="center_vertical"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:textColor="#ffffff">
</TextView>
<ImageView android:id="@+id/widgetBackground"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.5"
android:src="@drawable/ic_launcher"
android:layout_gravity="center_vertical">
</ImageView>
</LinearLayout>
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
Log.i(WIDGETTAG, "onUpdate");
final int N = appWidgetIds.length;
// Perform this loop procedure for each App Widget that belongs to this provider
for (int i=0; i<N; i++) {
int appWidgetId = appWidgetIds[i];
Log.i(WIDGETTAG, "updating widget[id] " + appWidgetId);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
/* View setup */
views.setInt(R.id.widgetTitle, "setBackgroundColor", Color.argb(150, 0, 0, 0));
Intent intent = new Intent(context, ChopInkService.class);
intent.setAction(ChopInkService.UPDATE_IMAGE);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, 0);
views.setOnClickPendingIntent(R.id.widgetBackground, pendingIntent);
Log.i(WIDGETTAG, "pending intent set");
// Tell the AppWidgetManager to perform an update on the current App Widget
appWidgetManager.updateAppWidget(appWidgetId, views);
}
@覆盖
public void onUpdate(上下文上下文,AppWidgetManager AppWidgetManager,
int[]appWidgetIds){
onUpdate(上下文、appWidgetManager、AppWidgetId);
Log.i(widgetag,“onUpdate”);
final int N=appWidgetIds.length;
//对属于此提供商的每个应用程序小部件执行此循环过程
对于(inti=0;iHi),您可以检查此以从URL(Http)加载图像
请尝试以下代码:
URL图像小部件提供程序类
public class URLImageAppWidgetProvider extends AppWidgetProvider {
public static String TAG = "URLImageWidget";
public static class Size_1_1 extends URLImageAppWidgetProvider {}
public static class Size_1_2 extends URLImageAppWidgetProvider {}
public static class Size_1_4 extends URLImageAppWidgetProvider {}
public static class Size_2_2 extends URLImageAppWidgetProvider {}
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
SharedPreferences urls = context.getSharedPreferences("urls.conf", Context.MODE_PRIVATE);
for (int id : appWidgetIds) {
String url = urls.getString("url_" + id, "");
update(context, appWidgetManager, id, url);
}
}
@Override
public void onDeleted(Context context, int[] appWidgetIds) {
super.onDeleted(context, appWidgetIds);
SharedPreferences urls = context.getSharedPreferences("urls.conf", Context.MODE_PRIVATE);
SharedPreferences.Editor urls_editor = urls.edit();
for (int id : appWidgetIds) {
urls_editor.remove("url_" + id);
}
urls_editor.commit();
}
public static void update(final Context context, final AppWidgetManager appWidgetManager, final int id, final String url) {
new Thread() {
public void run() {
Bitmap img = getBitmapFromUrl(url);
if (img != null) {
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.main);
views.setImageViewBitmap(R.id.img, img);
appWidgetManager.updateAppWidget(id, views);
}
}
}.start();
}
private static Bitmap getBitmapFromUrl(final String url) {
try {
return BitmapFactory.decodeStream(((java.io.InputStream)new java.net.URL(url).getContent()));
} catch (Exception e) {
return null;
}
}
}
下面是URL图像小部件配置类
public class URLImageAppWidgetConfiguration extends Activity {
private int id;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.configuration);
setResult(RESULT_CANCELED);
Intent intent = getIntent();
Bundle extras = intent.getExtras();
if (extras != null) {
id = extras.getInt(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
}
if (id == AppWidgetManager.INVALID_APPWIDGET_ID) {
finish();
}
}
public void addWidget(View v) {
SharedPreferences urls = getSharedPreferences("urls.conf", Context.MODE_PRIVATE);
SharedPreferences.Editor urls_editor = urls.edit();
String url = ((TextView) findViewById(R.id.url)).getText().toString();
if (!url.startsWith("http://")) url = "http://" + url;
urls_editor.putString("url_" + id, url);
urls_editor.commit();
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
URLImageAppWidgetProvider.update(this, appWidgetManager, id, url);
setResult(RESULT_OK,
new Intent().putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, id)
);
finish();
}
}
您好,您可以检查此以从URL(Http)加载图像
请尝试以下代码:
URL图像小部件提供程序类
public class URLImageAppWidgetProvider extends AppWidgetProvider {
public static String TAG = "URLImageWidget";
public static class Size_1_1 extends URLImageAppWidgetProvider {}
public static class Size_1_2 extends URLImageAppWidgetProvider {}
public static class Size_1_4 extends URLImageAppWidgetProvider {}
public static class Size_2_2 extends URLImageAppWidgetProvider {}
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
super.onUpdate(context, appWidgetManager, appWidgetIds);
SharedPreferences urls = context.getSharedPreferences("urls.conf", Context.MODE_PRIVATE);
for (int id : appWidgetIds) {
String url = urls.getString("url_" + id, "");
update(context, appWidgetManager, id, url);
}
}
@Override
public void onDeleted(Context context, int[] appWidgetIds) {
super.onDeleted(context, appWidgetIds);
SharedPreferences urls = context.getSharedPreferences("urls.conf", Context.MODE_PRIVATE);
SharedPreferences.Editor urls_editor = urls.edit();
for (int id : appWidgetIds) {
urls_editor.remove("url_" + id);
}
urls_editor.commit();
}
public static void update(final Context context, final AppWidgetManager appWidgetManager, final int id, final String url) {
new Thread() {
public void run() {
Bitmap img = getBitmapFromUrl(url);
if (img != null) {
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.main);
views.setImageViewBitmap(R.id.img, img);
appWidgetManager.updateAppWidget(id, views);
}
}
}.start();
}
private static Bitmap getBitmapFromUrl(final String url) {
try {
return BitmapFactory.decodeStream(((java.io.InputStream)new java.net.URL(url).getContent()));
} catch (Exception e) {
return null;
}
}
}
下面是URL图像小部件配置类
public class URLImageAppWidgetConfiguration extends Activity {
private int id;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.configuration);
setResult(RESULT_CANCELED);
Intent intent = getIntent();
Bundle extras = intent.getExtras();
if (extras != null) {
id = extras.getInt(
AppWidgetManager.EXTRA_APPWIDGET_ID,
AppWidgetManager.INVALID_APPWIDGET_ID);
}
if (id == AppWidgetManager.INVALID_APPWIDGET_ID) {
finish();
}
}
public void addWidget(View v) {
SharedPreferences urls = getSharedPreferences("urls.conf", Context.MODE_PRIVATE);
SharedPreferences.Editor urls_editor = urls.edit();
String url = ((TextView) findViewById(R.id.url)).getText().toString();
if (!url.startsWith("http://")) url = "http://" + url;
urls_editor.putString("url_" + id, url);
urls_editor.commit();
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
URLImageAppWidgetProvider.update(this, appWidgetManager, id, url);
setResult(RESULT_OK,
new Intent().putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, id)
);
finish();
}
}
看这个
这对您很有帮助,如果您发现任何问题,请告诉我。请参阅此
这对您很有帮助,如果您发现任何问题,请告诉我。可用的小部件视图和布局
小部件在其可使用的视图类中受到限制。作为布局,您可以使用框架布局、线性布局和相对布局类。作为视图,您可以使用模拟时钟、按钮、色度计、ImageButton、ImageView、ProgressBar和TextView
从Android 3.0开始,还有更多视图可用:GridView、ListView、StackView、ViewFlipper和AdapterViewFlipper。此适配器视图要求您定义集合视图小部件,本教程稍后将对此进行描述
小部件视图上唯一可能的交互是通过OnClickListener。此OnClickListener可以在小部件上注册,并由用户触发
AppWidgetProvider
您的BroadcastReceiver通常扩展AppWidgetProvider类
AppWidgetProvider类实现onReceive()方法,提取所需信息并调用以下小部件生命周期方法
由于您可以将一个小部件的多个实例添加到主屏幕,因此您拥有仅为添加/删除到主屏幕的第一个实例调用的生命周期方法,以及为小部件的每个实例调用的其他方法
小部件的生命周期
onEnabled()-第一次将小部件的实例添加到主屏幕时调用
onDisabled()-从主屏幕中删除小部件的最后一个实例后调用
onUpdate()-为小部件的每次更新调用。包含需要更新的AppWidgetId的ID。请注意,这可能是此提供程序的所有AppWidget实例,或者只是其中的一个子集,如方法JavaDoc中所述。例如,如果在主屏幕中添加了多个小部件,则只有最后一个会更改(直到重新安装)
onDeleted()-小部件实例从主屏幕中删除
这些方法中的所有长时间运行的操作都应该在服务中执行,因为广播接收器的执行时间是有限的。在onReceive()方法中使用异步处理没有帮助,因为系统可以在其onReceive()方法之后终止广播进程
有关小部件检查的更多详细信息
可用小部件视图和布局
小部件在其可使用的视图类中受到限制。作为布局,您可以使用框架布局、线性布局和相对布局类。作为视图,您可以使用模拟时钟、按钮、色度计、ImageButton、ImageView、ProgressBar和TextView
从Android 3.0开始,还有更多视图可用:GridView、ListView、StackView、ViewFlipper和AdapterViewFlipper。此适配器视图要求您定义集合视图小部件,本教程稍后将对此进行描述
小部件视图上唯一可能的交互是通过OnClickListener。此OnClickListener可以在小部件上注册,并由用户触发
AppWidgetProvider
您的BroadcastReceiver通常扩展AppWidgetProvider类
AppWidgetProvider类实现onReceive()方法,提取所需信息并调用以下小部件生命周期方法
由于您可以将一个小部件的多个实例添加到主屏幕,因此您拥有仅为添加/删除到主屏幕的第一个实例调用的生命周期方法,以及为小部件的每个实例调用的其他方法
小部件的生命周期
onEnabled()-第一次将小部件的实例添加到主屏幕时调用
onDisabled()-从主屏幕中删除小部件的最后一个实例后调用
onUpdate()-为小部件的每次更新调用。包含需要更新的AppWidgetId的ID。请注意,这可能是此提供程序的所有AppWidget实例,或者只是其中的一个子集,如方法JavaDoc中所述。例如,如果在主屏幕中添加了多个小部件,则只有最后一个会更改(直到重新安装)
onDeleted()-小部件实例从主屏幕中删除
这些方法中的所有长时间运行的操作都应该在服务中执行,因为广播接收器的执行时间是有限的