android.content.Intent#makeMainActivity ( )源码实例Demo

/**
 * Add the activity parent chain as specified by the
 * {@link android.R.attr#parentActivityName parentActivityName} attribute of the activity
 * (or activity-alias) element in the application's manifest to the task stack builder.
 *
 * @param sourceActivityName Must specify an Activity component. All parents of
 *                           this activity will be added
 * @return This TaskStackBuilder for method chaining
 */
public TaskStackBuilder addParentStack(ComponentName sourceActivityName) {
    final int insertAt = mIntents.size();
    PackageManager pm = mSourceContext.getPackageManager();
    try {
        ActivityInfo info = pm.getActivityInfo(sourceActivityName, 0);
        String parentActivity = info.parentActivityName;
        while (parentActivity != null) {
            final ComponentName target = new ComponentName(info.packageName, parentActivity);
            info = pm.getActivityInfo(target, 0);
            parentActivity = info.parentActivityName;
            final Intent parent = parentActivity == null && insertAt == 0
                    ? Intent.makeMainActivity(target)
                    : new Intent().setComponent(target);
            mIntents.add(insertAt, parent);
        }
    } catch (NameNotFoundException e) {
        Log.e(TAG, "Bad ComponentName while traversing activity parent metadata");
        throw new IllegalArgumentException(e);
    }
    return this;
}
 

/**
 * Launches an activity based on its component name.
 *
 * @param activity      Current foreground activity.
 * @param componentName Component name of the app to be launched.
 */
static void quickLaunch(Activity activity, String componentName) throws ActivityNotFoundException {
    // When receiving 'none', it's probably a gesture that hasn't been registered.
    if ("none".equals(componentName)) {
        return;
    }

    ComponentName component = ComponentName.unflattenFromString(componentName);

    // Forcibly end if we can't unflatten the string.
    if (component == null) {
        return;
    }

    Intent intent = Intent.makeMainActivity(component);
    intent.setFlags(
            Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

    activity.startActivity(intent);
}
 

/**
 * Launches an activity based on its component name.
 *
 * @param activity      Current foreground activity.
 * @param componentName Component name of the app to be launched.
 */
static void quickLaunch(Activity activity, String componentName) throws ActivityNotFoundException {
    // When receiving 'none', it's probably a gesture that hasn't been registered.
    if ("none".equals(componentName)) {
        return;
    }

    ComponentName component = ComponentName.unflattenFromString(componentName);

    // Forcibly end if we can't unflatten the string.
    if (component == null) {
        return;
    }

    Intent intent = Intent.makeMainActivity(component);
    intent.setFlags(
            Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

    activity.startActivity(intent);
}
 

private NotificationItem(int id, String title, String desc, String channelId) {
    super(id, title, desc);
    final Intent[] intents = new Intent[2];
    intents[0] = Intent.makeMainActivity(
            new ComponentName(DemoApplication.CONTEXT, MainActivity.class));
    intents[1] = new Intent(DemoApplication.CONTEXT, NotificationSampleActivity.class);
    final PendingIntent pendingIntent = PendingIntent.getActivities(
            DemoApplication.CONTEXT, 0, intents,
            PendingIntent.FLAG_UPDATE_CURRENT);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        builder = new NotificationCompat.Builder(
                FileDownloadHelper.getAppContext(),
                channelId);
    } else {
        //noinspection deprecation
        builder = new NotificationCompat.Builder(FileDownloadHelper.getAppContext())
                .setDefaults(Notification.DEFAULT_LIGHTS)
                .setPriority(NotificationCompat.PRIORITY_MIN);
    }

    builder.setContentTitle(getTitle())
            .setContentText(desc)
            .setContentIntent(pendingIntent)
            .setSmallIcon(R.mipmap.ic_launcher);
}
 

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
        Intent upIntent = Intent.makeMainActivity(new ComponentName(this, MainActivity.class));
        if (NavUtils.shouldUpRecreateTask(this, upIntent)) {
            TaskStackBuilder.create(this)
                    .addNextIntent(upIntent).startActivities();
            finish();
        } else {
            // This activity is part of the application's task, so simply
            // navigate up to the hierarchical parent activity.
            upIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
            startActivity(upIntent);
            finish();
        }
        return true;
    }
    return super.onOptionsItemSelected(item);
}
 

public Intent getLaunchIntent() {
    ContentResolver resolver = this.mPluginContext.getContentResolver();
    Intent launcher = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER);

    for (PackageParser.Activity activity : this.mPackage.activities) {
        for (PackageParser.ActivityIntentInfo intentInfo : activity.intents) {
            if (intentInfo.match(resolver, launcher, false, TAG) > 0) {
                return Intent.makeMainActivity(activity.getComponentName());
            }
        }
    }

    return null;
}
 

/**
 * Finds an intent to start an Activity of the given class. It looks up target context first and
 * fallback to instrumentation context.
 */
default Intent getIntentForActivity(Class<? extends Activity> activityClass) {
  Intent intent =
      Intent.makeMainActivity(
          new ComponentName(getInstrumentation().getTargetContext(), activityClass));
  if (getInstrumentation().getTargetContext().getPackageManager().resolveActivity(intent, 0)
      != null) {
    return intent;
  }
  return Intent.makeMainActivity(
      new ComponentName(getInstrumentation().getContext(), activityClass));
}
 

public static Intent getDefaultAlarmsIntent(Context context) {
    PackageManager pm = context.getPackageManager();
    for (String packageName : DESK_CLOCK_PACKAGES) {
        try {
            ComponentName cn = new ComponentName(packageName, "com.android.deskclock.AlarmClock");
            pm.getActivityInfo(cn, 0);
            return Intent.makeMainActivity(cn);
        } catch (PackageManager.NameNotFoundException ignored) {
        }
    }
    return getDefaultClockIntent(context);
}
 

public static Intent a(ComponentName componentname)
{
    return Intent.makeMainActivity(componentname);
}
 

public static Intent makeMainActivity(ComponentName mainActivity) {
    return Intent.makeMainActivity(mainActivity);
}
 

public static Intent makeMainActivity(ComponentName mainActivity) {
    return Intent.makeMainActivity(mainActivity);
}
 

public static Intent makeMainActivity(ComponentName mainActivity) {
    return Intent.makeMainActivity(mainActivity);
}
 

public static Intent makeMainActivity(ComponentName mainActivity) {
    return Intent.makeMainActivity(mainActivity);
}