在阅读本答案之前,您可以先看一下
这个更简单的选项(我希望在写这篇文章之前能够想到它)。如果您想让用户选择要设置的应用程序而不是让系统自动恢复默认设置,那么本答案仍然很有用。
要取消选择您的应用程序作为默认SMS应用程序,您可以让用户选择另一个合适的应用程序来代替您的应用程序,并使用该包名称触发
ACTION_CHANGE_DEFAULT
Intent
。
为了简化这个过程,我编写了
selectDefaultSmsPackage()
方法,它将找到所有接受
"android.provider.Telephony.SMS_DELIVER"
广播(排除当前包)的应用程序,并提示用户选择。这是一个相当幼稚的过滤标准,但最糟糕的情况就是所选的应用程序无法成功设置为默认值。
在从列表中选择所需的应用程序后,通常会出现是/否验证对话框。当
Activity
接收到结果时,所选应用程序的包名称将与当前设置的默认值进行比较,以确定是否成功。由于一些用户报告称在这种情况下结果代码不可靠,因此检查当前默认值是确保正确成功结果的唯一方法。
我们将使用自定义
Dialog
来列出合格应用程序的显示名称和图标。创建
AppsDialog
的
Activity
必须实现其
OnAppSelectedListener
接口。
public class MainActivity extends Activity
implements AppsDialog.OnAppSelectedListener {
...
private static final int DEF_SMS_REQ = 0;
private AppInfo selectedApp;
private void selectDefaultSmsPackage() {
final List<ResolveInfo> receivers = getPackageManager().
queryBroadcastReceivers(new Intent(Sms.Intents.SMS_DELIVER_ACTION), 0);
final ArrayList<AppInfo> apps = new ArrayList<>();
for (ResolveInfo info : receivers) {
final String packageName = info.activityInfo.packageName;
if (!packageName.equals(getPackageName())) {
final String appName = getPackageManager()
.getApplicationLabel(info.activityInfo.applicationInfo)
.toString();
final Drawable icon = getPackageManager()
.getApplicationIcon(info.activityInfo.applicationInfo);
apps.add(new AppInfo(packageName, appName, icon));
}
}
Collections.sort(apps, new Comparator<AppInfo>() {
@Override
public int compare(AppInfo app1, AppInfo app2) {
return app1.appName.compareTo(app2.appName);
}
}
);
new AppsDialog(this, apps).show();
}
@Override
public void onAppSelected(AppInfo selectedApp) {
this.selectedApp = selectedApp;
Intent intent = new Intent(Sms.Intents.ACTION_CHANGE_DEFAULT);
intent.putExtra(Sms.Intents.EXTRA_PACKAGE_NAME, selectedApp.packageName);
startActivityForResult(intent, DEF_SMS_REQ);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case DEF_SMS_REQ:
String currentDefault = Sms.getDefaultSmsPackage(this);
boolean isDefault = selectedApp.packageName.equals(currentDefault);
String msg = selectedApp.appName + (isDefault ?
" successfully set as default" :
" not set as default");
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
break;
...
}
}
我们需要以下POJO类来保存相关应用程序信息。
public class AppInfo {
String appName;
String packageName;
Drawable icon;
public AppInfo(String packageName, String appName, Drawable icon) {
this.packageName = packageName;
this.appName = appName;
this.icon = icon;
}
@Override
public String toString() {
return appName;
}
}
AppsDialog
类创建了一个简单的
ListView
,列出了可用的默认选项,并通过接口将所选项传回到
Activity
中。
public class AppsDialog extends Dialog
implements OnItemClickListener {
public interface OnAppSelectedListener {
public void onAppSelected(AppInfo selectedApp);
}
private final Context context;
private final List<AppInfo> apps;
public AppsDialog(Context context, List<AppInfo> apps) {
super(context);
if (!(context instanceof OnAppSelectedListener)) {
throw new IllegalArgumentException(
"Activity must implement OnAppSelectedListener interface");
}
this.context = context;
this.apps = apps;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("Select default SMS app");
final ListView listView = new ListView(context);
listView.setAdapter(new AppsAdapter(context, apps));
listView.setOnItemClickListener(this);
setContentView(listView);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
((OnAppSelectedListener) context).onAppSelected(apps.get(position));
dismiss();
}
private class AppsAdapter extends ArrayAdapter<AppInfo> {
public AppsAdapter(Context context, List<AppInfo> list) {
super(context, R.layout.list_item, R.id.text, list);
}
public View getView(int position, View convertView, ViewGroup parent) {
final AppInfo item = getItem(position);
View v = super.getView(position, convertView, parent);
((ImageView) v.findViewById(R.id.icon)).setImageDrawable(item.icon);
return v;
}
}
}
ArrayAdapter
使用以下项目布局:
list_item
。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:paddingTop="1dp"
android:paddingBottom="1dp"
android:paddingStart="8dp"
android:paddingEnd="8dp">
<ImageView android:id="@+id/icon"
android:layout_width="36dp"
android:layout_height="36dp" />
<TextView android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:paddingStart="?android:attr/listPreferredItemPaddingStart"
android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
android:minHeight="?android:attr/listPreferredItemHeightSmall"
android:ellipsize="marquee" />
</LinearLayout>