如何取消我的短信应用程序作为Android中的默认应用程序

Question

我想取消我的短信应用程序是否为android中的默认应用程序.我正在关注本教程:

http://android-developers.blogspot.com/2013/10/getting-your-sms-apps-ready-for-kitkat.html

我可以通过以下代码将我的短信应用设置为默认短信应用:

Intent intent = new Intent(context, Sms.Intents.ACTION_CHANGE_DEFAULT);
intent.putExtra(Sms.Intents.EXTRA_PACKAGE_NAME, context.getPackageName());
startActivity(intent);

但我想取消我的短信应用程序作为默认应用程序.我怎样才能做到这一点？

这里有一点需要注意:我已经安装了消息传递经典应用程序.从那个应用程序,我可以取消我的短信应用程序默认.

Answer 1

^{在您仔细阅读这个答案之前,您可能会看一下这个更简单的选项(我希望在使用这个选项之前我已经想过).如果您想让用户选择要设置的应用程序,而不是允许系统恢复到它所决定的任何一个应用程序,那么这个答案仍然很方便.}

要取消选择您的应用作为默认短信应用,您可以让用户选择另一个符合条件的应用作为默认应用的默认应用,并ACTION_CHANGE_DEFAULT Intent使用该套餐名称触发.

为了简化这个过程,我编写了一个selectDefaultSmsPackage()方法,可以找到所有接受"android.provider.Telephony.SMS_DELIVER"广播的应用程序(不包括当前包),并提示用户选择一个列表.这是一个相当天真的过滤标准,但最糟糕的情况是所选应用程序不会被成功设置为默认值.

从列表中选择所需的应用程序后,将显示通常的是/否验证对话框.当Activity接收到的结果,所选择的应用程序的包名相比,目前设置为默认值来确定是否成功.由于某些用户报告在这种情况下结果代码不可靠,因此检查当前默认值是保证正确成功结果的唯一方法.

我们将使用自定义Dialog列出符合条件的应用的显示名称和图标.在Activity创建AppsDialog必须实现它的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类来保存相关的应用信息.

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;
    }
}

所述AppsDialog类创建了一个简单ListView的可用默认值,并将该选择回Activity通过接口.

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;
        }
    }
}

在ArrayAdapter使用下列项目布局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>