[英]Android widget launch App and detect App Not found
我需要一个简单的家庭小部件来启动外部应用程序(例如:whatsapp)。
在我的MainActivity扩展AppWidgetProvider(onUpdate)中,我使用此代码创建挂起的意图,如果安装了该应用程序,则效果很好。
Intent intent = new Intent();
ComponentName cn = new ComponentName("com.whatsapp", "com.whatsapp.Main");
intent.setComponent(cn);
PendingIntent pending = PendingIntent.getActivity(context, 0, intent, 0);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.activity_main);
views.setOnClickPendingIntent(R.id.imageView, pending);
appWidgetManager.updateAppWidget(currentWidgetId, views);
在(onReceive)部分中,我使用此代码来检测是否已安装该应用程序
PackageManager pm = context.getPackageManager();
List<ApplicationInfo> list = pm.getInstalledApplications(0);
for (int aa = 0; aa < list.size(); aa++) {
if(list.get(aa).packageName.equals("com.whatsapp")){
//app istalled
noapp = 0;
}
else{
//app not istalled
noapp1 = 1;
}
}
if(noapp1==1){
Toast.makeText(context, "Whatsapp not installed", Toast.LENGTH_SHORT).show();
}
我的问题是:此代码检测是否未安装该应用程序,并仅在第一次将小部件放置在家庭中时显示Toast消息。 如果未安装该应用程序,则每当触摸imageview时,我都需要显示该消息。 请帮忙!
卡拉库里,我尝试应用您的建议。 这是我将意图附加到imageView的主要活动中的代码:
public class MainActivity extends AppWidgetProvider{
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
for(int i=0; i<appWidgetIds.length; i++){
int currentWidgetId = appWidgetIds[i];
Intent intent = new Intent(LaunchExternalAppReceiver.ACTION);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.activity_main);
views.setOnClickPendingIntent(R.id.imageView, pendingIntent);
// Tell the AppWidgetManager to perform an update on the current App Widget
appWidgetManager.updateAppWidget(currentWidgetId, views);
}
}
}
这是带有BroadcastReceiver的新类(我将我的简单代码放入其中以检查是否已安装该应用程序,仅用于测试):
public class LaunchExternalAppReceiver extends BroadcastReceiver {
public static final String ACTION = "control";
@Override
public void onReceive(Context context, Intent intent) {
PackageManager pm = context.getPackageManager();
List<ApplicationInfo> list = pm.getInstalledApplications(0);
for (int aa = 0; aa < list.size(); aa++) {
if(list.get(aa).packageName.equals("com.whatsapp")){
//app istalled
}
else{
//app not istalled
Toast.makeText(context, "Whatsapp not installed", Toast.LENGTH_SHORT).show();
}
}
}
}
这是我的清单:
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="19" /><application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<receiver android:name=".MainActivity" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/mywidget" />
</receiver>
<receiver android:name=".LaunchExternalAppReceiver" >
<intent-filter>
<action android:name="control" >
</action>
</intent-filter>
</receiver>
</application>
非常感谢你的帮助。
让ImageView单击将广播发送到应用程序中的接收者(使用PendingIntent.getBroadcast()
)。 在该接收器中,您可以检查是否安装了外部应用程序并从那里启动它。
编辑
制作一个新的BroadcastReceiver。
public class LaunchExternalAppReceiver extends BroadcastRecevier {
public static final String ACTION = "some-unique-string-here";
@Override
public void onReceive(Context context, Intent intent) {
// check if the external app is installed and launch it
PackageManager pm = context.getPackageManager();
try {
pm.getApplicationInfo("com.whatsapp", 0); // throws if not found
Intent intent = pm.getLaunchIntentForPackage("com.whatsapp");
if (intent != null) {
context.startActivity(intent);
}
} catch (NameNotFoundException e) {
// package not found, you can show the Toast here
}
}
}
将其添加到您的AndroidManifest。 确保意图过滤器动作与上面的动作匹配。
<receiver android:name=".LaunchExternalAppReceiver">
<intent-filter>
<action android:name="some-unique-string-here">
</intent-filter>
</receiver>
使您的ImageView通过此操作发送广播,而不是尝试启动外部应用程序。
Intent intent = new Intent(LaunchExternalAppReceiver.ACTION);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
remoteViews.setOnClickPendingIntent(R.id.imageView, pendingIntent);
我找到了替代解决方案。 工作打招呼,但有一个烦人的小问题。 我在主要活动中将意向附加到imageView上,以在该类中启动新类“控件”,我检查应用程序是否已安装并启动她或发送消息并提供下载按钮。 问题是...如果安装了该应用程序,则控制类将启动她,但是在打开应用程序之前会出现第二个活动(控件)屏幕。 很烦人。 有人可以帮助我做最后的修复吗? 谢谢。
在onUpdate(主要活动)中:
Intent controlIntent = new Intent(context, Control.class);
PendingIntent pendingc1 = PendingIntent.getActivity(context, 0, controlIntent, 0);
RemoteViews views1 = new RemoteViews(context.getPackageName(), R.layout.activity_main);
views1.setOnClickPendingIntent(R.id.imageView, pendingc1);
appWidgetManager.updateAppWidget(currentWidgetId, views1);
我的新课程(控件):
public class Control extends Activity {
private TextView testo;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
PackageManager pm = this.getPackageManager();
List<ApplicationInfo> list = pm.getInstalledApplications(0);
for (int aa = 0; aa < list.size(); aa++) {
if (list.get(aa).packageName.equals("com.whatsapp")) {
// app istalled
Intent launchIntent = getPackageManager()
.getLaunchIntentForPackage("com.whatsapp");
startActivity(launchIntent);
Control.this.finish();
} else {
setContentView(R.layout.control);
// app not istalled
testo = (TextView) findViewById(R.id.message);
String text = "WhatsApp is Not Installed\nPlease Download Whatsapp from Play Store";
testo.setText(text);
Button button = (Button) findViewById(R.id.exit);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Control.this.finish();
}
});
Button button2 = (Button) findViewById(R.id.download);
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri
.parse("market://details?id=" + "com.whatsapp")));
Control.this.finish();
}
});
}
}
}
}
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